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JP2008283318

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JP2008283318
The present invention provides an audio reproduction apparatus and an audio reproduction
method capable of controlling the frequency characteristic corresponding to one type of sound to
an optimal frequency characteristic in controlling the frequency characteristic of sound
according to the type of sound. An audio output conversion device (100) of the present invention
controls an amplification factor for each frequency characteristic, and an acoustic amplification
unit (110) for amplifying input audio data according to a predetermined amplification factor for
each frequency characteristic of audio data. The audio reproduction apparatus includes the
control unit 130. The control unit 130 controls the frequency characteristic of the amplification
factor based on the volume value designated from the outside and the information for identifying
the type of audio data. [Selected figure] Figure 1
Sound reproduction apparatus and sound reproduction method
[0001]
The present invention relates to an audio reproduction apparatus that adjusts the gain of an
audio signal by a filter having frequency characteristics and reproduces the audio.
[0002]
When viewing a broadcast program with a television broadcast receiver (hereinafter referred to
as a television) in a general home, the volume of the volume output by the television is made
relatively small, taking into consideration the viewing environment with the next room and the
neighbors. , Often watch a broadcast program.
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As described above, as the volume of output from the television decreases, the sense of reality
disappears when the broadcast program to be viewed is music, and the voice of the person is
absent when the target of viewing is the human voice. Becomes unclear.
[0003]
Furthermore, in recent years, with the increase in size of televisions, there has been a demand for
a realistic sound reproduction method adapted to the viewing environment of large televisions.
Here, Patent Document 1 discloses a sound reproduction device provided with a sound
determination device that determines whether a sound is a sound or a non-speech with respect to
a sound signal input by broadcast radio waves or the like.
[0004]
The sound reproduction device disclosed in the patent document 1 determines whether the
sound included in the input sound signal is voice or music by the voice determination device
provided internally, and based on the determination result in the voice determination device, the
sound is The frequency characteristics of the signal are changed to the optimum frequency
characteristics. That is, the type of sound included in the sound signal input to the sound
reproduction apparatus is determined, and the frequency characteristic of the sound to be output
is controlled according to the type of sound. As a result, when the sound included in the input
sound signal is music, a realistic sound can be output, while when the sound included in the input
sound signal is voice, the sound is clear and It can output an audible sound. Japanese Patent
Application Laid-Open No. 7-13586 (released on January 17, 1995)
[0005]
However, in the conventional example, the sound reproducing apparatus determines the
frequency characteristic of the sound to be output based only on the determination result as to
whether it is music or voice with respect to the input sound signal. In other words, the
conventional sound reproducing apparatus controls sound according to one frequency
characteristic for one sound type.
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[0006]
Therefore, even if the volume of the sound to be output is large, the sound reproducing
apparatus according to the conventional example controls the frequency characteristics of the
sound to be output according to the type of the sound, so that the sound quality of the human
voice to be output changes. There is.
[0007]
Furthermore, in the case of a volume value that is not normally used, such as when the volume of
the sound to be output is very small, there is a problem that the frequency characteristics by the
conventional sound reproduction device can not obtain sufficient effects. is there.
As a result, when the volume of the sound to be output is very small, there is a problem that
human voice, which is the sound to be output, is not clear and difficult to hear.
[0008]
The present invention has been made to solve the above problems, and its object is to further
optimize the frequency characteristic corresponding to one kind of sound in controlling the
frequency characteristic of sound according to the kind of sound. It is an object of the present
invention to provide an audio reproduction apparatus and an audio reproduction method capable
of controlling various frequency characteristics.
[0009]
In order to solve the above problems, an audio reproduction apparatus according to the present
invention comprises: amplification means for amplifying an input audio signal by a
predetermined amplification factor for each frequency of the audio signal; and the amplification
factor for each frequency An audio reproduction apparatus including: control means for
controlling the frequency of the amplification factor based on the volume value designated from
the outside and information identifying the type of the audio signal; It is characterized by
controlling every.
[0010]
The volume value is a value designated by the user who views the sound output from the sound
reproducing apparatus, and the user adjusts the volume value to adjust the magnitude of the
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sound output from the sound reproducing apparatus.
[0011]
According to the above configuration, the amplification factor in the amplification means can be
controlled for each frequency of the sound signal based on the volume value and the type of the
sound signal.
Thus, the frequency of the acoustic signal amplified by the amplifying means is controlled by
controlling the amplification factor in the amplifying means for each frequency of the acoustic
signal based on not only the type of the acoustic signal but also the volume value designated by
the user. The characteristics are frequency characteristics based on the type of acoustic signal
and the volume specified by the user.
[0012]
For example, when the acoustic signal is a voice signal, when the volume value is small, the
amplification factor can be controlled to emphasize the human voice band.
As described above, by controlling the amplification factor so as to emphasize the human voice
band, the frequency characteristic of the acoustic signal output from the amplification means is
such that the human voice band is emphasized.
As a result, even when the user reduces the volume of sound, human voice can output clear
sound.
[0013]
On the other hand, similarly, even when the sound signal is a voice signal, when the volume value
is large, it is not difficult for human voice to be heard. By making the amplification factor
constant, it is possible to prevent the sound quality of the output human voice from changing.
[0014]
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As described above, in controlling the frequency characteristic of sound according to the type of
sound, the sound reproducing apparatus according to the present invention can control the
frequency characteristic corresponding to one type of sound to a further optimum frequency
characteristic.
[0015]
In order to solve the above problems, an acoustic reproduction method according to the present
invention comprises the steps of: amplifying an input acoustic signal by a predetermined
amplification factor for each frequency of the acoustic signal; and the amplification factor for
each frequency An acoustic reproduction method comprising: controlling the frequency of the
frequency based on the volume value designated from the outside in the control step and
information identifying the type of the acoustic signal; It is characterized by controlling every.
[0016]
According to the above configuration, the same operation and effect as those of the sound
reproducing apparatus according to the present invention can be obtained.
[0017]
Further, the sound reproduction apparatus according to the present invention further includes a
determination unit that determines the type of the sound signal, the determination unit
determines whether the sound signal is a sound signal, and music. It is preferable to determine at
least one of the determination as to whether it is a signal or not from the acoustic signal.
[0018]
According to the above configuration, it is possible to determine from the sound signal whether
the sound signal is a sound signal or a music signal by the determination means.
[0019]
The sound reproduction method according to the present invention further includes a
determination step of determining the type of the sound signal, wherein in the determination
step it is determined whether the sound signal is an audio signal, and a music signal. It is
preferable to determine at least one of the determinations from the acoustic signal.
[0020]
According to the above configuration, the same operation and effect as those of the sound
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reproducing apparatus according to the present invention can be obtained.
[0021]
Further, in the sound reproduction apparatus according to the present invention, the
determination unit further determines whether the sound signal is a sound determination unit
that determines whether the sound signal is a sound signal and whether the sound signal is a
music signal. Music determination means, preferably.
[0022]
According to the above configuration, it is possible to determine by the sound determination unit
whether the sound signal is a sound signal from the sound signal itself input to the sound
reproduction apparatus and to determine whether the sound signal is a music signal by the
music determination unit .
Therefore, the determination means can more accurately determine whether the input audio
signal is a voice signal or a music signal.
[0023]
Further, in the sound reproduction apparatus according to the present invention, the sound
determination unit determines the sound signal as a sound signal, and the music determination
unit determines the sound signal as a music signal. Alternatively, if the sound determination unit
determines that the sound signal is not a sound signal, and if the music determination unit
determines that the sound signal is not a music signal, the determination unit determines
whether the sound signal is a sound signal. Preferably, the signal is determined to be another
signal that is neither a music signal nor an audio signal.
[0024]
According to the above configuration, it can be determined that the acoustic signal input to the
acoustic reproduction device is not a voice signal or a music signal, or any other signal.
As a result, when the input acoustic signal is a signal including voice and music, the control
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means can control the amplification factor according to both conditions.
[0025]
Further, in the sound reproducing apparatus according to the present invention, when the
judging means judges that the sound signal is a sound signal, the low frequency band, the middle
band, and the low frequency band of the frequency of the sound signal are low. When divided
into the three high frequency bands, the control means makes the amplification factor of the mid
frequency band larger than the amplification factor of the low frequency band and the high
frequency band, and the smaller the volume value, the lower the low frequency band. And it is
preferable to control the said amplification factor so that the difference of the amplification
factor of the said high region and the amplification factor of the said middle region may become
large.
[0026]
First, the main band of human speech corresponds to the middle band in the frequency of the
acoustic signal.
According to the above configuration, when the determination means determines that the
acoustic signal is a voice signal, the mid band of the acoustic signal is emphasized more than the
low band and the high band.
Furthermore, the smaller the volume value, the more emphasis will be placed on the mid band.
Therefore, even when the volume value is small, the middle band is emphasized, in other words,
the main band of human voice is emphasized, and as a result, an effect that an audible signal can
be output is produced. .
[0027]
Furthermore, according to the above configuration, when the volume value is large, that is, when
the volume value is sufficiently easy for a human voice to be heard, the emphasis on the middle
band is reduced.
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As a result, it is possible to reduce the change in the sound quality of human voice that is
generated by emphasizing the mid band.
[0028]
Further, in the sound reproducing apparatus according to the present invention, when the
judging means judges that the sound signal is a music signal, the low frequency band, the middle
band, and the low frequency band of the frequency of the sound signal are low. When divided
into the three high frequency bands, the control means makes the amplification factor of at least
one of the low or high frequency band larger than the amplification factor of the mid frequency
band, and the volume value is small. It is preferable to control the amplification factor so as to
increase the difference between the amplification factor of at least one of the low band and the
high band and the amplification factor of the middle band as the value decreases.
[0029]
According to the above configuration, when the sound signal is determined to be a music signal,
the smaller the volume value is, the more the amplification factor of at least one of the low band
and the high band is emphasized.
In general, music uses more low and high frequency bands than human voice.
Furthermore, the smaller the volume value, the lower the sense of reality of the output music.
[0030]
Here, by providing the above-described configuration, the sound reproducing apparatus
according to the present invention emphasizes the low band and the high band when the volume
value is small.
As a result, the volume value is reduced, and the effect of suppressing the realism of music is
exhibited.
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[0031]
Further, in the sound reproducing apparatus according to the present invention, when the
judging means judges that the sound signal is another signal, the low frequency band, the middle
band, and the low frequency band of the frequency of the sound signal are low. When divided
into the three high frequency bands, the control means preferably controls the amplification
factor so that the amplification factor of the low frequency band, the middle frequency band, and
the high frequency band becomes constant.
[0032]
According to the above configuration, when it is determined that the acoustic signal is neither a
voice signal nor a music signal, in other words, another unknown signal, the amplification factor
for the band from the low band to the high band is It will be constant.
As a result, it is possible to prevent a change in sound quality of the sound that is generated by
emphasizing a specific band.
[0033]
Further, in the sound reproduction device according to the present invention, the sound signal is
included in a broadcast wave, and the sound reproduction device receives information indicating
a genre of a broadcast program included in the broadcast wave. Preferably, the control means
controls the amplification factor using information indicating the genre as information
identifying the type of the acoustic signal.
[0034]
According to the above configuration, the amplification factor can be controlled for each
frequency of the audio signal using the information indicating the genre of the broadcast
program as the information for identifying the type of audio signal.
The information indicating the genre of the broadcast program is information included in the
airwaves and can be easily acquired.
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As a result, there is an effect that it is not necessary to provide a complicated circuit for acquiring
information for identifying the type of acoustic signal.
[0035]
In the sound reproduction method according to the present invention, the sound signal is
included in a broadcast wave, and in the sound reproduction method, information indicating a
genre of a broadcast program included in the broadcast wave is input. In the control step, it is
preferable to control the amplification factor using information indicating the genre as the
information identifying the type of the acoustic signal.
[0036]
According to the above configuration, the same operation and effect as those of the sound
reproducing apparatus according to the present invention can be obtained.
[0037]
Further, in the sound reproduction apparatus according to the present invention, the control
means further determines whether the sound signal is any one of an audio signal, a music signal,
and other signals. It is preferable to judge from the information to show and to control the said
amplification factor using the result which self judged.
[0038]
By providing the above configuration, the control means can determine whether the sound signal
is an audio signal, a music signal or another signal based on the information indicating the genre.
As a result, the types of acoustic signals can be classified into three types, and the control of the
amplification factor in the amplification means can be simplified for each frequency of the
acoustic signals.
[0039]
Further, in the sound reproducing apparatus according to the present invention, when the
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control means determines that the sound signal is a sound signal, the low frequency band, the
middle frequency band, and the low frequency band of the frequency of the sound signal are low.
When divided into the three high frequency bands, the control means makes the amplification
factor of the mid frequency band larger than the amplification factor of the low frequency band
and the high frequency band, and the smaller the volume value, the lower the low frequency
band And it is preferable to control the said amplification factor so that the difference of the
amplification factor of the said high region and the amplification factor of the said middle region
may become large.
[0040]
According to the above configuration, when it is determined that the sound signal is a voice
signal, the middle band of the sound signal is emphasized more than the low band and the high
band.
Furthermore, the smaller the volume value, the more emphasis will be placed on the mid band.
Therefore, even when the volume value is small, the middle band is emphasized, in other words,
the main band of human voice is emphasized, and as a result, an effect that an audible signal can
be output is produced. .
[0041]
Further, in the sound reproducing apparatus according to the present invention, when the
control means determines that the sound signal is a music signal, the low frequency band, the
middle frequency band, and the low frequency band of the frequency of the sound signal are low.
When divided into the three high frequency bands, the control means makes the amplification
factor of at least one of the low or high frequency band larger than the amplification factor of the
mid frequency band, and the volume value is small. It is preferable to control the amplification
factor so as to increase the difference between the amplification factor of at least one of the low
band and the high band and the amplification factor of the middle band as the value decreases.
[0042]
According to the above configuration, when the sound signal is determined to be a music signal,
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the smaller the volume value is, the more the amplification factor of at least one of the low band
and the high band is emphasized.
As described above, by emphasizing the low and high frequency bands when the volume value is
small, it is possible to suppress the decrease in the realism of music when the volume value is
small.
[0043]
Further, in the sound reproducing apparatus according to the present invention, when the
control means determines that the sound signal is another signal, the low frequency band, the
middle frequency band, and the low frequency band of the frequency of the sound signal are low.
When divided into the three high frequency bands, the control means preferably controls the
amplification factor so that the amplification factor of the low frequency band, the middle
frequency band, and the high frequency band becomes constant.
[0044]
According to the above configuration, when it is determined that the acoustic signal is neither a
voice signal nor a music signal, in other words, another unknown signal, the amplification factor
for the band from the low band to the high band is It will be constant.
The effect of this is as described above.
[0045]
Further, in the sound reproduction device according to the present invention, the sound signal is
included in a broadcast wave, and the sound reproduction device receives information indicating
a genre of a broadcast program included in the broadcast wave. And determining means for
determining at least one of the determination of whether the acoustic signal is a sound signal or
the determination of whether it is a music signal, and the control means determines the type of
the acoustic signal. It is preferable to control the said amplification factor using the information
which shows the determination result of the said determination means, and the said genre as
information to identify.
[0046]
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According to the above configuration, the sound reproducing apparatus controls the
amplification factor for each frequency of the sound signal using two information of the
determination result of the determination means and the information indicating the genre.
As a result, it is possible to control the amplification factor for each frequency of the acoustic
signal according to the type of the acoustic signal more accurately.
[0047]
Further, in the sound reproduction method according to the present invention, the sound signal
is included in a broadcast wave, and in the sound reproduction method, information indicating a
genre of a broadcast program included in the broadcast wave is input. A determination step of
determining at least one of the determination of whether the sound signal is a sound signal or
the determination of whether it is a music signal, and the control step determines the type of the
sound signal. It is preferable to control the said amplification factor using the information which
shows the determination result of the said determination means, and the said genre as
information to identify.
[0048]
According to the above configuration, the same operation and effect as those of the sound
reproducing apparatus according to the present invention can be obtained.
[0049]
Further, in the sound reproduction apparatus according to the present invention, the
determination unit further determines whether the sound signal is a sound determination unit
that determines whether the sound signal is a sound signal and whether the sound signal is a
music signal. Music determination means for determining, from the information indicating the
genre, whether the sound signal is a sound signal, a music signal, or any other signal. It is
preferable to do.
[0050]
According to the above configuration, the sound reproducing apparatus uses either of the
determination result of the determination means and the determination result of the control
means, any one of the audio signal, the audio signal, the music signal, and the other signals. It is
determined whether the signal is
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[0051]
Here, the control means determines the type of sound from information indicating the genre of
the broadcast program, and the determination means determines the type of sound from the
input sound signal, and these two determination results The sound reproduction apparatus of the
present invention can also control the amplification factor in the amplification means using
For example, the information indicating the genre of the broadcast program is information
indicating the genre of the music system, and the control means determines that the audio signal
is a music signal, and the determination means further converts the audio signal into an audio
signal. When it is determined, the determination result of the determination means is prioritized
to emphasize the middle band in the frequency of the acoustic signal, but in consideration of the
determination result of the control means, the degree of enhancement to the middle band is
reduced. .
As described above, by using two determination results of the determination result from the
control means and the determination result from the determination means, it is possible to more
optimally control the amplification factor in the amplification means.
[0052]
Further, in the sound reproduction apparatus according to the present invention, the sound
determination unit determines the sound signal as a sound signal, and the music determination
unit determines the sound signal as a music signal. Alternatively, if the sound determination unit
determines that the sound signal is not a sound signal, and if the music determination unit
determines that the sound signal is not a music signal, the determination unit determines
whether the sound signal is a sound signal. Preferably, the signal is determined to be another
signal that is neither music nor voice.
[0053]
According to the above configuration, it can be determined that the acoustic signal input to the
acoustic reproduction device is not a voice signal or a music signal, or any other signal.
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As a result, when the input acoustic signal is a signal including voice and music, the control
means can control the amplification factor according to both conditions.
[0054]
Further, in the sound reproducing apparatus according to the present invention, when the
judging means judges that the sound signal is another signal, the control means controls the
amplification factor based on the judgment result of itself. Is preferred.
[0055]
As described above, even if the determination unit determines that the acoustic signal is another
signal, in other words, even if it is determined that the signal is an unknown signal, the
amplification factor is determined for each frequency of the acoustic signal based on the
determination result by the control unit. Effect that can be controlled appropriately.
[0056]
Further, in the sound reproducing apparatus according to the present invention, when the
judging means judges that the sound signal is a sound signal, the low frequency band, the middle
band, and the low frequency band of the frequency of the sound signal are low. When divided
into the three high frequency bands, the control means makes the amplification factor of the mid
frequency band larger than the amplification factor of the low frequency band and the high
frequency band, and the smaller the volume value, the lower the low frequency band And it is
preferable to control the said amplification factor so that the difference of the amplification
factor of the said high region and the amplification factor of the said middle region may become
large.
[0057]
According to the above configuration, when it is determined that the sound signal is a voice
signal, the middle band of the sound signal is emphasized more than the low band and the high
band.
The effect at this time is as described above.
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[0058]
Further, in the sound reproducing apparatus according to the present invention, when the
control means determines that the sound signal is a music signal or another signal, the
determination result of itself is that the sound signal is a sound signal. It is preferable to control
the amplification factor so that the difference between the amplification factor in the middle
band and the amplification factor in the low band and the high band is smaller than in the case
where it is determined.
[0059]
According to the above configuration, when the determination means determines that the
acoustic signal is a voice signal, it is possible to control the degree of emphasis on the middle
band based on the determination result by the control means.
[0060]
Further, in the sound reproducing apparatus according to the present invention, when the
judging means judges that the sound signal is a music signal, the low frequency band, the middle
band, and the low frequency band of the frequency of the sound signal are low. When divided
into the three high frequency bands, the control means makes the amplification factor of at least
one of the low or high frequency band larger than the amplification factor of the mid frequency
band, and the volume value is small. It is preferable to control the amplification factor so as to
increase the difference between the amplification factor of at least one of the low band and the
high band and the amplification factor of the middle band as the value decreases.
[0061]
According to the above configuration, when the sound signal is determined to be a music signal,
the smaller the volume value is, the more the amplification factor of at least one of the low band
and the high band is emphasized.
The effects at this time are as described above.
[0062]
Further, in the sound reproducing apparatus according to the present invention, when the
control means determines that the sound signal is a sound signal or another signal, the
determination result of itself is that the sound signal is a music signal. It is preferable to control
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the amplification factor so that the difference between the amplification factor in the middle
band and the amplification factor in the low band and the high band is smaller than in the case
where it is determined.
[0063]
According to the above configuration, when the determination means determines that the sound
signal is a music signal, the degree of emphasis on at least one of the low range and the high
range can be controlled based on the determination result from the control means.
[0064]
In the sound reproducing apparatus according to the present invention, the judging means
further judges that the sound signal is another signal, and the control means judges that the
sound signal is a sound signal. In the case where the frequency band of the acoustic signal is
divided into three bands, low, middle and high, in the low order, the control means determines
the amplification factor of the middle as the low and the high. The amplification factor is
controlled such that the difference between the amplification factor of the low band and the high
band and the amplification factor of the middle band becomes larger as the volume factor is
smaller than the amplification factor of the band. It is preferable to do.
[0065]
According to the above configuration, even if the determination means determines that the
acoustic signal is another signal, in other words, a voice or music or an unknown signal, the
control means determines that the acoustic signal is a voice signal. Based on the result, it is
possible to emphasize the mid band in the frequency of the audio signal.
Furthermore, the smaller the volume value is, the emphasis is on the mid-range band, which is
the main band in human speech, so that even if the volume value is small, human speech is made
clear and audible sounds are output it can.
[0066]
Further, in the sound reproducing apparatus according to the present invention, the judging
means further judges that the sound signal is another signal, and the control means judges that
the sound signal is a music signal. In the case where the frequency band of the acoustic signal is
divided into three bands, low, middle and high, in order of low, the control means amplifies at
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least one of the low or the high. The rate is larger than the amplification factor of the middle
band, and the smaller the volume value is, the larger the amplification factor of at least one of the
low band or the high band and the amplification factor of the middle band It is preferable to
control the amplification factor so as to increase the difference.
[0067]
According to the above configuration, even if the determination means determines that the
acoustic signal is another signal, in other words, a voice or music or an unknown signal, the
control means determines that the acoustic signal is a music signal. Based on the result, at least
one of the low band and the high band in the frequency of the audio signal can be emphasized.
Furthermore, as the volume value is smaller, at least one of the low band and the high band is
emphasized, so that it is possible to suppress the decrease in the realism of music when the
volume value is small.
[0068]
In the sound reproducing apparatus according to the present invention, the judging means
further judges that the sound signal is another signal, and the control means judges that the
sound signal is another signal. In this case, when the frequency band of the acoustic signal is
divided into three bands of low, middle, and high frequencies in the low order, the control means
amplifies the low, middle, and high frequencies. It is preferable to control the amplification factor
such that the rate is constant.
[0069]
According to the above configuration, when it is determined that both of the determination
results of the determination means and the control means indicate that the acoustic signal is
another signal, in other words, an unknown signal, amplification for the band from the low band
to the high band The rate will be constant.
As a result, it is possible to prevent a change in sound quality of the sound that is generated by
emphasizing a specific band.
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[0070]
As described above, the sound reproduction apparatus and the sound reproduction method of the
present invention control the amplification factor for each sound signal based on the volume
value and the information for identifying the type of the sound signal.
Therefore, in controlling the frequency characteristic of sound according to the type of sound,
the frequency characteristic corresponding to one type of sound can be further controlled to the
optimum frequency characteristic.
[0071]
Hereinafter, an embodiment according to the present invention will be described based on the
drawings.
[0072]
First Embodiment A first embodiment of the present invention will be described below with
reference to FIGS. 1 to 5.
[0073]
(Configuration of Television Broadcast Reception and Reproduction Device 10) First, the
configuration of the television broadcast reception and reproduction device 10 including the
audio output conversion device 100 of the present invention will be described with reference to
FIG.
FIG. 2 is a block diagram showing the configuration of the television broadcast receiving and
reproducing apparatus 10 provided with the audio output conversion device 100. As shown in
FIG.
In the figure, only the main components of the television method reception and reproduction
device 10 are extracted and shown.
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[0074]
As shown in the figure, a television broadcast receiving and reproducing apparatus (hereinafter
referred to as a television) 10 has an analog tuner unit 20 for inputting an analog broadcast
signal received from an antenna, and a digital for inputting a digital broadcast signal received
from an antenna. A tuner unit 30, an AV switch unit 21 for dividing an analog broadcast signal
into video data and audio data, a digital demodulation unit 31 for demodulating a digital
broadcast signal, digital video data and digital audio data obtained by demodulating a digital
broadcast signal , A video decoding unit 33 for decoding digital video data, an audio decoding
unit 34 for decoding digital audio data, a video selector unit 40, an audio selector unit 41, and a
video output conversion unit 42. , Audio output converter 00 and a (sound reproduction device).
[0075]
(Operation of Television Broadcast Reception Device 10) The television 10 inputs an analog
broadcast signal, which is a broadcast program received by an antenna, to the AV switch unit 21
via the analog tuner unit 20.
The AV switch unit 21 divides the input analog broadcast signal into video data which is
information of video in a broadcast program and audio data which is information of sound.
The video selector unit 40 inputs the video data divided by the AV switch unit 21.
Further, the audio selector unit 41 inputs the audio data divided by the AV switch unit 21.
[0076]
On the other hand, the digital demodulation unit 31 receives a digital broadcast signal received
from an antenna via the digital tuner unit 30, and demodulates the received digital broadcast
signal.
Next, the separation unit 32 outputs the digital broadcast signal demodulated by the digital
demodulation unit 31.
08-05-2019
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Here, the separation unit 32 divides the digital broadcast signal demodulated by the digital
demodulation unit 31 into digital video data as video information and digital audio data as
acoustic information.
Since the digital video data divided by the separation unit 32 is encoded data, the video decoding
unit 33 decodes the digital video data and outputs the decoded data as video data to the video
selector unit 40.
Similarly, since digital audio data is also encoded data, the audio decoding unit 34 decodes the
digital audio data and outputs it to the audio selector unit 41.
[0077]
Next, the video selector unit 40 which has input the video data from the AV switch unit 21 and
the video data from the video decoding unit 33 selects the video data corresponding to the
broadcast program to be reproduced among the two input video data. It is selected and output to
the video output conversion unit 42.
The video output conversion unit 42 converts the input video data into a data format that can be
reproduced by the liquid crystal display panel 50.
The video data converted by the video output conversion device 42 is displayed by the liquid
crystal display panel 50.
[0078]
On the other hand, the audio selector unit 41 which has received the audio data from the AV
switch unit 21 and the audio data from the audio decoding unit 34 selects audio data
corresponding to the broadcast program to be reproduced among the two input audio data.
Output to the audio output conversion device 100 (sound reproduction device).
08-05-2019
21
The audio output conversion device 100 converts the input audio data into a data format that
can be reproduced by the speaker 60.
In the audio output conversion device 100, the converted audio data is reproduced by the
speaker 60.
[0079]
(Configuration of Audio Output Conversion Device 100) Next, the configuration of the audio
output conversion device 100, which is an embodiment of the present invention, will be
described with reference to FIG. FIG. 1 is a block diagram showing the configuration of the audio
output conversion device 100. As shown in FIG.
[0080]
As shown in the figure, the audio output conversion device 100 includes an acoustic
amplification unit 110 (amplification means), an audio / music determination unit 120
(determination means), and a control unit 130 (control means).
[0081]
(Operation of Audio Output Conversion Device 100) The audio output conversion device 100
inputs the audio data (sound signal) from the audio selector unit 41 to the sound amplification
unit 110 and the audio / music determination unit 120.
The audio and music determination unit 120 having input the audio data determines whether the
input audio data is data including audio, data including music, or other data. Next, the audio /
music determination unit 120 determines that the determination result is two binary signals of
an audio flag indicating whether the audio data is audio data and a music flag indicating whether
the audio data is music data. Output to the control unit 130. Here, the audio music determination
unit 120 sets the audio flag to 1 when the audio data is determined to be audio data, and outputs
the audio flag to the control unit 130 when the audio data is determined to be data other than
audio. Do. Furthermore, the audio / music determination unit 120 sets the music flag to 1 when
the audio data is determined to be music data, and outputs the music flag to 0 when determined
08-05-2019
22
to be data other than music, to the control unit 130. .
[0082]
Here, the audio music determination unit 120 includes an audio determination unit (audio
determination means) that determines whether or not the input audio data is data that includes
audio, and a music determination unit that determines whether the data includes music. ing.
Further, the voice determination unit (music determination means) outputs a voice flag, and the
music determination unit outputs a music flag.
[0083]
In the present embodiment, the determination method in the audio / music determination unit
120 uses the method described in Patent Document 1, but the audio output conversion device
100 of the present invention is not limited to this. From the input audio data, it may be
determined whether the audio data is voice or music or any other.
[0084]
Furthermore, in the present embodiment, the determination result from the audio / music
determination unit 120 is input to the control unit 130 as the two signals of the audio flag and
the music flag, but the present invention is not limited to this. Only one of the voice flag and the
music flag may be input to the control unit 130.
As an example, when the signal from the audio / music determination unit 120 is only the audio
flag, when the audio flag is 1, it is determined that the audio data input to the audio output
conversion device 100 is audio, When the audio flag is 0, it may be determined that the audio
data is music. Alternatively, when the audio flag is 0, it may be determined that the audio data is
other. On the contrary, when the signal from the audio / music determination unit 120 is only
the music flag, when the music flag is 1, it is determined that the audio data input to the audio
output conversion device 100 is music, When the music flag is 0, it may be determined that the
audio data is voice. Alternatively, when the music flag is 0, it may be determined that the audio
data is other.
[0085]
08-05-2019
23
Next, when the audio flag is 1 and the music flag is 0, the control unit 130 recognizes that the
input audio data is determined to be audio data in the audio / music determination unit 120. Do.
Furthermore, when the audio flag is 0 and the music flag is 1, the control unit 130 recognizes
that the input audio data is determined to be music data in the audio / music determination unit
120. . When both the voice flag and the music flag are 0, or when both the voice flag and the
music flag are 1, the control unit 130 controls the voice / music determination unit 120 to input
the audio data as voice. It is recognized that it is determined as audio data which is neither data
nor music data. Alternatively, the audio data may be determined to be audio if the audio flag and
the music flag are both 1 with priority given to the audio flag. Alternatively, in the case where the
audio flag and the music flag are both 1 with priority given to the music flag, it may be
determined that the audio data is music.
[0086]
Also, the audio output conversion device 100 inputs the volume value for designating the output
volume, which is selected by the user who views the television 10, to the control unit 130.
[0087]
Here, based on the audio flag and the music flag which are information of the determination
result from the audio music determination unit 120 and the volume value, the control unit 130 in
the audio amplification unit 110 for each frequency of the sound included in the audio data.
Generate control parameters for setting the amplification factor.
The control unit 130 outputs the generated control parameter to the acoustic amplification unit
110. The acoustic amplification unit 110, which has received the control parameter from the
control unit 130, adjusts a parametric equalizer (hereinafter referred to as PEQ) provided therein
based on the received control parameter. Here, the acoustic amplification unit 110 can control
the amplification factor for each frequency of the acoustic included in the audio data by inputting
the control parameter. That is, in terms of the amplification factor for the entire frequency range
of sound, the amplification factor in the acoustic amplification unit 110 has frequency
characteristics. A detailed description of this PEQ and control parameters will be described later.
[0088]
08-05-2019
24
(State Transition Based on Judgment Result and Volume Value) Next, the relationship between
the judgment result and volume value from the audio / music judgment unit 120 and the
amplification factor having the frequency characteristic in the acoustic amplification unit will be
described with reference to FIG. Do. FIG. 3 is an explanatory view showing the relationship
between the determination result from the audio / music determination unit 120 input from the
control unit 130, the volume value input from the outside, and the amplification factor having
the frequency characteristic in the acoustic amplification unit 110. is there.
[0089]
As shown in the figure, when the television 10 equipped with the audio output conversion device
100 is powered on, the audio output conversion device 100 first sets the state of the
amplification factor in the acoustic amplification unit 110 to the state 131 B which is the initial
state. . This state 131 B is a state in which the amplification factor from the low band to the high
band in the frequency of the sound included in the audio data is made to have a constant
frequency characteristic with respect to the audio data input by the sound amplification unit 110.
[0090]
The frequency of the sound included in the audio data is divided into three bands, and the low
band, the middle band, and the high band are arranged in the order of low frequency.
Furthermore, in the present embodiment, the middle range in the frequency of sound is 200 Hz
to less than 5 kHz, the high range is 5 kHz or more, and the low range is less than 200 Hz.
[0091]
Next, when the frequency characteristic of the amplification factor corresponding to the state
131B is shown in the graph, it becomes the characteristic graph 140B or 141B shown in the
same figure. The characteristic graph described below is a graph showing frequency
characteristics corresponding to three types of volume values, with the horizontal axis
representing frequency and the vertical axis representing amplification factor. The characteristic
graph 140B or 141B has a constant amplification factor from low to high in the frequency of the
sound included in the audio data, and corresponds to three volume values, Vol large, Vol middle,
08-05-2019
25
and Vol small. It shows that the respective amplification factors are constant. That is, the control
unit 130 causes the amplification in the acoustic amplification unit 110 to make constant the
amplification factor from low to high in the frequency of the sound included in the audio data
and to be the amplification factor corresponding to the input volume value. Control the rate.
Although the volume value in the present embodiment has three or more types of values, in the
present specification, for the sake of convenience of explanation, the volume value input from the
outside is loudly output from the speaker. In the following, the volume values will be described
briefly in the following: volume size of Vol, volume volume of sound smaller than volume volume
Vol, and volume size of volume smaller than volume volume Vol smaller.
[0092]
Next, the audio output conversion device 100 inputs the audio data from the audio selector unit
41 (see FIG. 2) to the audio music determination unit 120, and the sound included in the input
audio data is music, voice or not Determine if As described above, the audio / music
determination unit 120 outputs the determination result to the control unit 130 according to the
audio flag and the music flag. When the input sound flag is 1 and the music flag is 0, the control
unit 130 sets the control parameter to the sound amplification unit 110 so that the state of the
amplification factor in the sound amplification unit 110 becomes the state 131A. Output to If the
frequency characteristic of the amplification factor in the acoustic amplification unit 110
corresponding to the state 131A is shown as a graph, it becomes a characteristic graph 140A or
141A. The frequency characteristics of the amplification factor shown in the characteristic
graphs 140A and 141A are controlled by the control unit 130 so that the amplification factor of
the midrange in the frequency of the audio data is higher than the amplification factor of the
lowband and the highband. Furthermore, the frequency characteristics of the amplification factor
shown in the characteristic graphs 140A and 141A are such that the smaller the input volume
value is, the larger the difference between the amplification factor of the middle band and the
amplification factor of the low band and the high band is It is controlled by the control unit 130.
In other words, as the input volume value decreases, the control unit 130 controls the sound
amplification unit 110 so as to emphasize the sound in the middle range more than the sound in
the low range and the high range.
[0093]
As described above, when the voice flag from the voice / music determination unit 120 is 1 and
the music flag is 0, in other words, when the sound included in the input audio data is
determined to be voice, the volume The smaller the value, the stronger the main frequency band
08-05-2019
26
in human speech by emphasizing the 200 Hz to 5 kHz sound in the frequency of the audio data.
As a result, even if the volume of the sound output from the speaker 60 is reduced, there is an
effect that the human voice which is the sound to be output can be easily heard.
[0094]
Furthermore, as shown in the characteristic graphs 140A and 141A, when the volume value is a
large value, constant amplification from the low band to the high band is performed without
emphasizing the middle band sound over the low band and high band sound. The control unit
130 controls the acoustic amplification unit 110 to the frequency characteristic to be the rate. In
this way, when the volume value is large, by setting the frequency characteristic such that the
amplification factor from the low band to the high band is constant, the sound quality of the
human voice changes when the sound in the middle band is emphasized Can prevent the
problem.
[0095]
Next, the frequency characteristic of the amplification factor in the acoustic amplification unit
110 when the control unit 130 receives the determination result that the audio flag is 0 and the
music flag is 1 from the audio / music determination unit 120 will be described.
[0096]
When the control unit 130 inputs the determination result that the sound flag is 0 and the music
flag is 1 from the sound and music determination unit 120, the control unit 130 sets the state of
the amplification factor in the sound amplification unit 110 to state 131C. The control parameter
is output to the acoustic amplification unit 110 so that
The frequency characteristic of the amplification factor in the acoustic amplification unit 110
corresponding to the state 131C is shown as a characteristic graph 140C or 141C. The frequency
characteristics of the amplification factor shown in the characteristic graphs 140C and 141C are
controlled by the control unit 130 so that the amplification factor of the low band and the high
band at the frequency of the sound included in the audio data becomes higher than the
amplification factor of the mid band. It is done. Furthermore, the frequency characteristics of the
amplification factor shown in the characteristic graphs 140C and 141C show that the lower the
input frequency and the higher the amplification factor of the high frequency region in the sound
08-05-2019
27
frequency included in the audio data and Are controlled by the control unit 130 so as to increase
the difference therebetween.
[0097]
In general, music is louder in low and high bands at the frequency of sound compared to human
voice. The volume of the low and high bands will affect the realism of the music. Also, if the
frequency characteristics of the sound pressure of the sound from low to high, that is, the shape
of the curve indicating the sound pressure from low to high, is the same, the smaller the sound
pressure of the sound, the more human being Because of its auditory characteristics, it is said
that the low band and the high band feel the sound size smaller than the mid band. Therefore,
when the volume is small, when the user listens to music, the realism of the music is increased by
increasing the volume of the low band and the high band.
[0098]
Here, when the audio flag from the audio / music determination unit 120 is 0 and the music flag
is 1, in other words, when the sound included in the input audio data is determined to be music,
audio output conversion The apparatus 100 emphasizes low and high frequency sounds at the
frequency of the audio data. This emphasizes the low and high frequencies of the music that is
the sound output from the speaker 60. As a result, even if the sound output from the speaker 60
is small, the audio output conversion device 100 produces an effect that the music that is the
sound to be output can be a music that is full of presence.
[0099]
Next, when the control unit 130 inputs a determination result in which both the voice flag and
the music flag are 0 or both the voice flag and the music flag are 1 from the voice and music
determination unit 120, the acoustic amplification unit 110. The frequency characteristic of the
amplification factor in the above will be described.
[0100]
When the control unit 130 inputs a determination result in which both the voice flag and the
music flag are 0 or both the voice flag and the music flag are 1 from the voice and music
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28
determination unit 120, the control unit 130 selects the sound amplification unit 110. The
control parameter is output to the acoustic amplification unit 110 so that the state of the
amplification factor in the state of (1) becomes the state 131B.
The frequency characteristics of the amplification factor described in the characteristic graphs
140B and 141B corresponding to the state 131B are as described above.
[0101]
As described above, in the audio output conversion device 100, the audio / music determination
unit 120 determines whether the sound included in the input audio data is voice, music, or any
other, and the determination from the audio / music determination unit 120 The control unit
130 controls the amplification factor of the acoustic amplification unit 110 based on the result
and the input volume value.
[0102]
In the present embodiment, two characteristic graphs of characteristic graphs 140A and 141A
are described as graphs showing frequency characteristics of amplification factor corresponding
to the state 131A.
The difference between the two characteristic graphs is the difference between the emphasis on
the mid-frequency region of the audio data and the attenuation. In the characteristic graph 140A,
as the volume value is smaller, the midrange sound is emphasized more strongly, and it is
possible to more easily hear the human voice which is the sound output from the speaker 60. On
the other hand, in the characteristic graph 141A, when emphasizing the sound in the middle
region, the degree of emphasis on the sound in the middle region is set weaker than in the
characteristic graph 140A. Here, when the determination result in the audio / music
determination device 120 switches from audio to music, the frequency characteristic of the
amplification factor in the acoustic amplification unit 110 is also switched. Therefore, when the
frequency characteristic of the amplification factor in the acoustic amplification unit 110 is
switched, the user who is listening to the sound output from the speaker 60 may feel discomfort.
Here, as in the characteristic graph 141A, by setting the degree of emphasis on the sound in the
middle range weakly, even when the frequency characteristic of the amplification factor in the
acoustic amplification unit 110 is switched, the user feels a sense of discomfort Can.
08-05-2019
29
[0103]
Also in the case of the state 131C, two characteristic graphs of the characteristic graphs 140C
and 141C are similarly described as a graph showing the frequency characteristic of the
amplification factor corresponding to the state 131C. The difference between the two
characteristic graphs is the difference between the increase and decrease in the degree of
emphasis on the low and high frequencies of the frequency in the audio data. In the
characteristic graph 140C, as the volume value decreases, the low and high frequency sounds are
more strongly emphasized, and the music output from the speaker 60 can be made more
realistic. On the other hand, in the characteristic graph 141C, when emphasizing the low and
high frequency sounds, the degree of emphasis on the low and high frequency sounds is set
weaker than in the characteristic graph 140C. Here, as described above, when the determination
result in the audio / music determination apparatus 120 is switched from audio to music, the
frequency characteristic of the amplification factor in the acoustic amplification unit 110 is also
switched.
[0104]
Therefore, as in the characteristic graph 141C, by setting weakly the degree of emphasis on low
and high frequency sounds, even when the frequency characteristic of the amplification factor in
the acoustic amplification unit 110 is switched, the sense of discomfort felt by the user is
reduced. It can be done.
[0105]
Further, in the audio output conversion apparatus 100, as the frequency characteristic of the
amplification factor in the acoustic amplification unit 110, whether it is the characteristic shown
in the characteristic graphs 140A to 140C or the characteristic shown in the characteristic
graphs 141A to 141C. It may be determined according to the specification of the television 10 on
which the output conversion device 100 is mounted.
[0106]
(Configuration of Acoustic Amplification Unit 110) Hereinafter, the acoustic amplification unit
includes a signal processing unit (equalizer) that performs signal processing by filter setting and
a signal amplification unit (amplifier) that performs signal amplification.
[0107]
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30
Next, the configuration of the acoustic amplification unit 110 will be described with reference to
FIGS. 4 (a) and 4 (b).
FIG. 4 (a) is an explanatory diagram showing a configuration in the case where the amplification
factor of the signal amplification unit (fixed amplifier) is constant and the volume including the
frequency characteristic is controlled by the signal processing unit (equalizer). ) Is an explanatory
view showing a configuration of the acoustic amplification unit 110b in the case of controlling
the overall amplification factor by the signal amplification unit (variable amplifier) and
controlling the frequency characteristic by the signal processing unit (equalizer).
[0108]
The acoustic amplification unit 110 a in FIG. 4A and the acoustic amplification unit 110 b in FIG.
4B correspond to the acoustic amplification unit 110 shown in FIG. 1.
[0109]
As shown in FIG. 6A, the acoustic amplification unit 110a amplifies the audio data input to the
acoustic amplification unit 110a by an amplification factor having a predetermined frequency
characteristic, and an audio from the equalizer 111. A D / A converter 113 converts data into an
analog audio signal, and a fixed amplifier 112a amplifies the analog audio signal from the D / A
converter 113 with a fixed amplification factor.
[0110]
In the present embodiment, the equalizer 111 is configured by a DSP (Digital Signal Processor),
but the present invention is not limited to this, and may be configured by a semiconductor
component other than the DSP.
[0111]
(Operation of Acoustic Amplification Unit 110, Digital Volume) The operation of the acoustic
amplification unit 110a will be described below when the volume value input by the control unit
130a is input as a digital signal.
In the following description, the control unit 130 when the input volume value is input as a
08-05-2019
31
digital signal is referred to as a control unit 130 a.
[0112]
The acoustic amplification unit 110 a inputs the audio data from the audio selector unit 41 to the
equalizer 111.
Further, the equalizer 111 inputs, from the control unit 130a, a control parameter for
determining an amplification factor having frequency characteristics with respect to the input
audio data.
The equalizer 111 determines the frequency characteristic of the amplification factor and the
amplification amount that determines the magnitude of the sound output from the speaker 60
based on the input control parameter.
[0113]
Specifically, when the control unit 130a receives an audio flag of 1 and a music flag of 0 from the
audio / music determination unit 120, the control unit 130a sends the equalizer 111, as shown
in FIG. As described in the characteristic graph 142A indicating the state of the frequency
characteristic, in other words, the control parameter is output so as to be an amplification factor
that emphasizes the middle band in the frequency of the sound included in the audio data.
Of the three amplification factors shown in the characteristic graph 142A, which amplification
factor is to be obtained is determined based on the volume value input by the control unit 130a.
That is, as the input volume value is smaller, the control unit 130a has an amplification factor
that emphasizes the middle band in the frequency of the sound included in the audio data more
than the low band and the high band. Thus, the control parameter is output to the equalizer 111.
[0114]
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32
Further, when the control unit 130 a receives an audio flag of 0 and a music flag of 1 from the
audio / music determination unit 120, the control unit 130 a sends the equalizer 111 a
frequency characteristic shown in FIG. As described in the characteristic graph 142B indicating
the state, in other words, the control parameter is output such that the amplification factor
emphasizes the low band and high band in the frequency of the sound included in the audio data.
Also in this case, among the three amplification factors shown in the characteristic graph 142B,
the control part 130a determines which of the three amplification factors has an amplification
factor based on the input volume value. That is, as the input volume value is smaller, the control
unit 130a has an amplification factor that emphasizes the low band and high band in the
frequency of the sound included in the audio data more than the middle band. Thus, the control
parameter is output to the equalizer 111. In the present embodiment, when control unit 130a
receives an audio flag of 0 and a music flag of 1 from audio / music determination unit 120,
control unit 130a causes equalizer 111 to be included in audio data. Control parameters are
output so as to emphasize the low and high bands above the mid band at the frequency of the
sound being sounded, but the control parameters so as to emphasize only one of the low or high
bands May be output.
[0115]
Furthermore, when the control unit 130 a inputs a determination result in which both the voice
flag and the music flag are 0 or both the voice flag and the music flag are 1 from the voice and
music determination unit 120, the control unit 130 a performs the equalizer 111. On the other
hand, as described in the characteristic graph 142C showing the state of the frequency
characteristic shown in FIG. 4A, in other words, in the entire low to high frequency band of the
sound frequency included in the audio data, Control parameters are output so that the
amplification factor has a constant frequency characteristic. In this case, the control unit 130a
controls the control parameters so that the frequency characteristic of the amplification factor of
the entire band from the low band to the high band becomes constant and the amplification
factor based on the input volume value. Is output to the equalizer 111.
[0116]
The amplification factor having the frequency characteristic in the equalizer 111 is an
amplification factor in which the frequency characteristic of the amplification factor and the
amplification amount for determining the magnitude of the sound output from the speaker 60
are added.
08-05-2019
33
[0117]
The D / A converter 113 inputs the audio data amplified by the equalizer 111.
The D / A conversion unit 113 converts audio data input from the equalizer 111 into an analog
audio signal, and outputs the analog audio signal to the fixed amplifier 112 a. The fixed amplifier
112 a amplifies the amplitude of the analog audio signal input from the D / A converter 113 in
order to output to the speaker 60. Furthermore, the fixed amplifier 112 a outputs the amplified
analog audio signal to the speaker 60. The amplification factor in the fixed amplifier 112a is a
fixed amplification factor, and is an independent amplification factor not based on the volume
value input by the control unit 130 and the determination result from the audio / music
determination unit.
[0118]
(Operation of Equalizer 111) Here, the control parameter from the control unit 130a and the
filter setting of the operation in the equalizer 111 will be described with reference to FIGS. 5 (a)
and 5 (b). In the case of the acoustic amplification unit 110a, not only the filter setting but also
the amplification amount for setting the overall gain is controlled, but this is omitted. FIG. 5 (a) is
an explanatory view for explaining control parameters from the control unit, and FIG. 5 (b) is an
explanatory view showing an operation inside the equalizer 111. As shown in FIG.
[0119]
First, in the present embodiment, the equalizer 111 is a PEQ configured by a DSP. Therefore, the
equalizer 111 has a center frequency (hereinafter referred to as f0) of a band handled by the
equalizer 111, a bandwidth (hereinafter referred to as Q) for determining the width of the band
from the center frequency, and an amplification level in the bandwidth Q By inputting three
parameters with a gain level (hereinafter referred to as "dBgain") that determines the
amplification factor with its own frequency characteristic can be determined.
[0120]
08-05-2019
34
As shown in (a) of the figure, the control unit 130 is three parameters that constitute control
parameters based on the volume value input from the outside, the audio flag from the audio /
music determination unit 120, and the music flag. Generate f0, Q, dBgain. The control unit 130
outputs the generated f0, Q, and dBgain to the equalizer 111.
[0121]
Next, the operation of the equalizer 111 to which the control parameters f0, Q and dBgain are
input will be described with reference to FIG. 5 (b).
[0122]
The equalizer 111 includes a conversion table 114 inside itself.
The equalizer 111 which receives the control parameter from the control unit 130a converts the
input f0, Q, dBgain into five parameters a1, a2, b0, b1, b2 by the conversion table 114. Here, the
equalizer 111 uses the inverse Z transform of multiple layers and the five parameters a1, a2, b0,
b1 and b2 generated by the conversion table 114 to determine the frequency characteristics of
the sound included in the input audio data. Determine the amplification factor to have.
[0123]
The relationship between f0, Q and dBgain and the five parameters a1, a2, b0, b1 and b2 is as
follows. a1 = 2 × cos (w0) / (1 + sin (w0) / (2 × Q) / 10 <dBgain / 40>) a2 = (− 1 + sin (w0) / (2
× Q) / 10 <dBgain / 40>) / (1 + sin (w0) / (2 × Q) / 10 <dBgain / 40>) b0 = (1 + sin (w0) / (2 ×
Q) × 10 <dBgain / 40>) / (1 + sin (w0) / (2) × Q) / 10 <dBgain / 40>) b1 = −2 × cos (w0) / (1
+ sin (w0) / (2 × Q) / 10 <dBgain / 40>) b2 = (1−sin (w0) / (2 × Q) × 10 <dBgain / 40>) / (1 +
sin (w0) / (2 × Q) / 10 <dBgain / 40>) (Operation of acoustic amplification unit 110, analog
volume) Next, control The operation of the acoustic amplification unit 110 when the volume
value input by the unit 130 is an analog signal will be described below with reference to FIG. In
the following description, the control unit 130 in the case where the input volume value is an
analog signal is referred to as the control unit 130 b. Furthermore, in the following description,
only the operation different from the operation of the acoustic amplification unit 110 in the case
where the volume value input by the control unit 130 is a digital signal will be described, and the
description of overlapping portions will be omitted.
08-05-2019
35
[0124]
As shown in the figure, when the volume value input by the control unit 130b is an analog signal,
the fixed amplifier 112a shown in FIG. 4A becomes the variable amplifier 112b. Thereby, the
amplification amount for determining the magnitude of the sound output from the speaker 60 is
determined by the amplification factor in the variable amplifier 112 b. That is, when the signal
amplification unit is a fixed amplification factor, when the volume value input by the control unit
130 b is a digital signal, the frequency characteristic of the amplification factor for the sound
included in the audio data and the magnitude of the sound output from the speaker 60 The
control unit 130a outputs a control parameter to the equalizer 111 in order to control the
amplification amount that determines the amplitude. On the other hand, when the signal
amplification unit is a variable amplification factor, when the volume value input by the control
unit 130b is an analog signal, the equalizer 111 determines only the frequency characteristic of
the amplification factor for the sound included in the audio data. As such, the control unit 130 b
outputs the control parameter to the equalizer 111.
[0125]
Specifically, when the control unit 130 b receives an audio flag of 1 and a music flag of 0 from
the audio / music determination unit 120, the control unit 130 b instructs the equalizer 111 as
shown in FIG. As shown in the characteristic graph 143A indicating the state of the frequency
characteristic, in other words, the control parameter is output so as to emphasize the middle
band in the frequency of the sound included in the audio data. Note that among the three
amplification factors shown in the characteristic graph 143A, which amplification factor is to be
obtained is determined based on the volume value input by the control unit 130b. That is, as the
input volume value is smaller, the control unit 130 b has a frequency characteristic that
emphasizes the middle band in the frequency of the sound included in the audio data more than
the low band and the high band. Thus, the control parameter is output to the equalizer 111.
[0126]
Furthermore, when the control unit 130 b receives an audio flag of 0 and a music flag of 1 from
the audio / music determination unit 120, the control unit 130 b sends the equalizer 111 a
frequency characteristic shown in FIG. As described in the characteristic graph 143B indicating
the state, in other words, the control parameter is output so as to emphasize the low band and
08-05-2019
36
high band of the frequency of the sound included in the audio data. Note that among the three
amplification factors shown in the characteristic graph 143B, which amplification factor is to be
obtained is determined based on the input volume value by the control unit 130b. That is, as the
input volume value is smaller, the control unit 130 b has a frequency characteristic that
emphasizes the low band and the high band in the frequency of the sound included in the audio
data more than the middle band. Thus, the control parameter is output to the equalizer 111.
[0127]
Furthermore, when the control unit 130 b inputs a determination result in which both the sound
flag and the music flag are 0 or both the sound flag and the music flag are 1 from the sound and
music determination unit 120, the control unit 130 b outputs an equalizer 111. On the other
hand, as described in the characteristic graph 143C showing the state of the frequency
characteristic shown in FIG. 4B, in other words, in all the low to high regions of the frequency of
the sound included in the audio data, The control parameter is output so as to have a frequency
characteristic such that the amplification factor becomes constant.
[0128]
As described above, when the volume value input by the control unit 130 b is an analog signal,
the purpose of the equalizer 111 is to amplify the signal having frequency characteristics so as to
emphasize a specific band for the sound included in the audio data. It is to amplify by a factor.
[0129]
On the other hand, with regard to the amplification amount for determining the magnitude of the
sound output from the speaker 60, the control unit 130b outputs the amplification amount based
on the input volume value to the variable amplifier 112b.
The variable amplifier 112 b amplifies the amplitude of the analog audio signal from the D / A
converter 113 based on the amplification amount input from the control unit 130 b.
Here, the amplification factor in the variable amplifier 112b based on the amplification amount
for determining the magnitude of the sound output from the speaker 60 determines the
magnitude of the sound output from the speaker 60, and is shown in FIG. As shown in the
characteristic graph 145, the amplification factor is constant at low to high frequencies with
respect to sound. The graphs showing the three amplification factors in the characteristic graph
08-05-2019
37
145 correspond to Vol volume, Vol middle, and Vol small, which are three volume values input
by the control unit 130 b.
[0130]
As described above, when the volume value input by the control unit 130 b is an analog signal,
the equalizer 111 performs amplification with frequency characteristics so as to emphasize a
specific band with respect to the sound included in the audio data. The variable amplifier 112b
performs amplification to determine the magnitude of the sound output from the speaker 60,
that is, the volume of the sound.
[0131]
The configurations shown in the second and third embodiments are modifications of the first
embodiment.
Specifically, the information input by the control unit is changed to various information.
[0132]
In the second and third embodiments, portions different from the above-described first
embodiment will be described, and the same members as in the first embodiment will be denoted
by the same reference numerals as those in the first embodiment, and the description thereof will
be omitted.
[0133]
Second Embodiment An audio output conversion device 200 according to a second embodiment
of the present invention will be described below with reference to FIGS.
[0134]
(Configuration of Audio Output Conversion Device 200) First, the configuration of the audio
output conversion device 200 will be described below with reference to FIG.
08-05-2019
38
FIG. 6 is a block diagram showing the configuration of the audio output conversion device 200.
As shown in FIG.
[0135]
As shown in the figure, the audio output conversion device 200 (sound reproduction device)
includes an acoustic amplification unit 110 and a control unit 230 (control means, input means).
Here, the audio output conversion device 200 is mounted on the television 10 (see FIG. 2), and
the audio output conversion device 200 is replaced with the audio output conversion device 100
in the television 10.
[0136]
(Operation of Audio Output Conversion Device 200) The audio output conversion device 200
inputs the audio data from the audio selector unit 41 (see FIG. 2) to the acoustic amplification
unit 110. Further, the audio output conversion device 200 inputs the volume value of the sound
output from the speaker 60, which is selected by the user who views the television 10, to the
control unit 230. Here, in the separation unit 32 (see FIG. 2), it is assumed that PSI / SI
information data is acquired from the digital broadcast signal demodulated by the digital
demodulation unit 31 (see FIG. 2). Furthermore, the separation unit 32 extracts information
(hereinafter referred to as genre information) indicating the genre of the currently received
broadcast program from the PSI / SI information data, and outputs the information to the audio
output conversion device 200. The audio output conversion device 200 inputs the genre
information from the separation unit 32 to the control unit 230.
[0137]
Next, the control unit 230 which has input the genre information determines which one of the
three groups, the input genre information is a voice group, a music group, or any other group.
Do. Specifically, the control unit 230 sets three groups, each including an audio system group, a
music system group, and other groups, for all types of genres included in PSI / SI information
data. It stores a correspondence table that determines which group it will be. The control unit
230 determines which group the genre information input from the separating unit 32 is to be
08-05-2019
39
based on the correspondence table.
[0138]
Here, with reference to FIG. 7, an example of the correspondence table showing the relationship
between the genre of the broadcast program and the group in the control unit 230 will be
described. FIG. 7 is an explanatory view showing an example of the correspondence table in the
control unit 230. As shown in FIG.
[0139]
As shown in the figure, in the correspondence table in the control unit 230, if the genre of the
broadcast program is music or theater / performance, it becomes a music-related genre group.
Furthermore, in the correspondence table in the control unit 230, if the genre of the broadcast
program is news / report, sports, information / wide show, drama, variety, movie, animation /
special effects, documentary / education, hobbies / education, welfare , Become a group of voicebased genres. Furthermore, in the correspondence table in the control unit 230, if the genre of
the broadcast program is otherwise, it becomes an unknown genre group. Here, considering that
the genre information of the broadcast program is extracted from PSI / SI information data, the
control unit 230 inputs the genre information only when the digital broadcast signal is received.
Therefore, in the present embodiment, when the analog broadcast signal is received, in other
words, when the genre information is not input from separation unit 32, control unit 230
determines that the currently received broadcast program is a group of unknown genres. It is
determined that
[0140]
Note that the genre of broadcast programs and the grouping of the genres shown in the
correspondence table are merely an example, and it is needless to say that different groupings
may be made based on the specifications of the audio output conversion device 200 or the like.
Further, not only the sound system and the music system but also more classifications may be
performed, and the amplification factor may be determined for every genre.
[0141]
08-05-2019
40
Next, the control unit 230 outputs control parameters to the acoustic amplification unit 110
based on the input volume value and the genre group determined from the genre information.
The operation in the acoustic amplification unit 110 to which the control parameter has been
input is as described in the first embodiment.
[0142]
(State Transition Based on Genre Information and Volume Value) Below, the relationship between
the group and volume value of each genre and the amplification factor having the frequency
characteristic in the acoustic amplification unit 110 according to the control parameter from the
control unit 230 is shown in FIG. This will be described with reference to FIG. FIG. 8 is an
explanatory view showing a relationship between a volume value input by the control unit 230
and a group of genres determined from the genre information and an amplification factor having
a frequency characteristic in the acoustic amplification unit 110. As shown in FIG.
[0143]
As shown in the figure, when the television 10 equipped with the audio output conversion device
200 is powered on, the audio output conversion device 200 inputs genre information of the
received broadcast program from the separation unit 32. The audio output device 200
determines a genre group corresponding to the input genre information in the control unit 230
provided therein. Here, when the determined genre group is a voice system genre group, the
control unit 230 sets the control parameter to the sound amplification unit so that the state of
the amplification factor in the sound amplification unit 110 becomes the state 231A. Output to
110. If the frequency characteristic of the amplification factor in the acoustic amplification unit
110 corresponding to the state 231A is shown as a graph, it becomes the characteristic graph
240A or 241A shown in the same drawing. As for the frequency characteristics of the
amplification factor shown in the characteristic graphs 240A and 241A, as the input volume
value decreases, the amplification factor of the midrange in the frequency of the sound included
in the audio data is higher than the amplification factor of the lowband and highband Is
controlled by the control unit 230 to be high. In other words, the control unit 230 controls the
acoustic amplification unit 110 to emphasize the middle band more than the low band and the
high band as the input volume value decreases.
08-05-2019
41
[0144]
As described above, when the genre information input to the control unit 230 is the genre of the
audio system, the audio output conversion device 200 determines that the input audio data is
audio data by the control unit 230. . As described above, when it is determined that the audio
data is audio data, the audio output conversion device 200 determines that the smaller the
volume of the sound output from the speaker 60 is, the more the sound is in the frequency band
of human speech. It will emphasize the mid range. As a result, even if the sound output from the
speaker 60 becomes small, it is possible to make the human voice from the speaker 60 easy to
hear.
[0145]
Next, when the control unit 230 determines that the genre group corresponding to the input
genre information is a music system genre group, the control unit 230 determines the state of
the amplification factor in the sound amplification unit 110. The control parameter is output to
the acoustic amplification unit 110 so as to be in the state 231B. If the frequency characteristic
of the amplification factor in the acoustic amplification unit 110 corresponding to the state 231B
is shown as a graph, it becomes the characteristic graph 240B or 241B shown in the same figure.
As for the frequency characteristics of the amplification factor shown in the characteristic graphs
240B and 241B, as the input volume value decreases, the low and high frequency amplification
factors in the frequency of the sound included in the audio data are higher than the amplification
factor of the midrange Is controlled by the control unit 230 to be high. In other words, as the
input volume value decreases, the control unit 230 controls the acoustic amplification unit 110
so as to emphasize the low band and the high band more than the mid band.
[0146]
As described above, when the genre information input to the control unit 230 is a music genre,
the audio output conversion device 200 determines that the input audio data is music data. As
described above, when it is determined that the audio data is voice data, the lower the sound
volume and the higher the sound will be emphasized as the volume of the sound output from the
speaker 60 becomes smaller. Thereby, when the volume of the sound output from the speaker 60
is small, the audio output conversion device 200 suppresses the decrease in the sense of reality
of the music output from the speaker 60.
08-05-2019
42
[0147]
Note that, in the present embodiment, when the control unit 230 determines that the audio data
is music data, the control unit 230 transmits to the sound amplification unit 110 a low frequency
band in the frequency of the sound included in the audio data. Although the control parameter is
output so as to emphasize the high frequency band and the high frequency band from the mid
frequency band, the control parameter may be output so as to emphasize only one of the low
frequency or high frequency band.
[0148]
Next, when the control unit 230 determines that the group of genres corresponding to the input
genre information is a group of other genres, the control unit 230 determines the state of the
amplification factor in the acoustic amplification unit 110, The control parameter is output to the
acoustic amplification unit 110 so as to be in the state 231C.
The frequency characteristic of the amplification factor in the acoustic amplification unit 110
corresponding to the state 231C is shown as a characteristic graph 240C or 241C. The frequency
characteristics of the amplification factor shown in the characteristic graphs 240C and 241C are
controlled by the control unit 230 so that the amplification factor from the low band to the high
band in the frequency of the sound included in the audio data becomes constant.
[0149]
As described above, in the audio output conversion apparatus 200, the control unit 230
determines the input genre information as a group of genres, and the sound amplification unit
110 based on the determined genre group and the input volume value. Control the amplification
factor having frequency characteristics. Furthermore, the audio output conversion device 200
multiplies the sound included in the audio data from the audio selector unit 41 by an
amplification factor having a frequency characteristic, whereby the volume of the sound output
from the speaker 60 is small. Also, it makes it easy to listen to the human voice which is the
sound to be output, and suppresses the deterioration of the realism of the music which is the
sound to be output.
[0150]
08-05-2019
43
In the present embodiment, two characteristic graphs of the characteristic graphs 240A and
241A are described as graphs showing the frequency characteristics of the amplification factor
corresponding to the state 231A. The difference between the two characteristic graphs is the
difference between the emphasis on the mid-frequency region of the audio data and the
attenuation. In the characteristic graph 240A, the lower the volume value is, the more emphasis
is placed on the mid-range sound, making it easier to hear the human voice that is the sound
output from the speaker 60. On the other hand, in the characteristic graph 241A, in emphasizing
the sound in the middle region, the degree of emphasis on the sound in the middle region is set
weaker than in the characteristic graph 240A. Here, the genre information of the broadcast is set
for each program. For example, even when there is music in a program whose genre is a drama,
the genre information remains a drama. Therefore, if the emphasis is made too strong, the
realism of the music becomes very poor when the music flows. Here, as in the characteristic
graph 241A, by setting weakly the degree of emphasis on the sound in the middle range, the lack
of sense of presence when music is flowing in a program of a group whose category is audio is
reduced. be able to.
[0151]
Further, as a graph showing the frequency characteristic of the amplification factor
corresponding to the state 231B, two characteristic graphs of the characteristic graphs 240B and
241B are described. The difference between the two characteristic graphs is the difference
between the increase and decrease in the degree of emphasis on the low and high frequencies of
the frequency in the audio data. In the characteristic graph 240B, as the volume value decreases,
the low and high frequency sounds are more strongly emphasized, and the music output from
the speaker 60 can be made more realistic. On the other hand, in the characteristic graph 241B,
when emphasizing the low and high frequency sounds, the degree of emphasis on the low and
high frequency sounds is set weaker than that of the characteristic graph 240B. Here, the genre
information of the broadcast is set for each program. For example, even when there is a talk in a
program whose genre is music, the genre information remains music. Therefore, if the emphasis
is made too strong, it becomes very difficult to hear the human voice in the case of the talk. Here,
as in the characteristic graph 241B, by setting the degree of emphasis on the low and high
frequency sounds weakly, it is difficult for the human voice to be heard when there is talk in the
program of the group whose genre is music. Can be reduced.
[0152]
Furthermore, since the control parameters output from the control unit 230 to the acoustic
08-05-2019
44
amplification unit 110 are the same as the control parameters output from the control unit 130
described in the first embodiment, the description thereof is omitted here.
[0153]
Third Embodiment An audio output conversion device 300 according to a third embodiment of
the present invention will be described below with reference to FIGS. 9 to 10.
[0154]
(Configuration of Audio Output Conversion Device 300) First, the configuration of the audio
output conversion device 300 will be described below with reference to FIG.
FIG. 9 is a block diagram showing the configuration of the audio output conversion device 300.
As shown in FIG.
[0155]
As shown in the figure, the audio output conversion device 300 (sound reproduction device)
includes an acoustic amplification unit 110, an audio / music determination unit 120, and a
control unit 330.
Here, the audio output conversion device 300 is mounted on the television 10 (see FIG. 2), and
the audio output conversion device 300 is replaced with the audio output conversion device 100
in the television 10.
[0156]
(Operation of Audio Output Conversion Device 300) The audio output conversion device 300
inputs audio data from the audio selector unit 41 (see FIG. 2) to the acoustic amplification unit
110 and the audio / music determination unit 120. Here, the audio / music determination unit
120 determines whether the input audio data is data including audio, data including music, or
other data, and the determination result is two signals of an audio flag and a music flag.
08-05-2019
45
Therefore, the signal is output to the control unit 330. The audio / music determination unit 120
is as described in the first embodiment, and thus the detailed description is omitted here.
[0157]
Furthermore, the audio output conversion device 300 inputs the volume value of the output
volume selected by the user who views the television 10 to the control unit 330. Further, as in
the second embodiment described above, the audio output conversion apparatus 300 inputs
genre information of the currently received broadcast program from the separation unit 32 to
the control unit 330. Here, the control unit 330 determines which one of the three groups, the
input genre information is a voice group, a music group, or any other group. The operation and
method of determination of the genre information are the same as in the second embodiment,
and thus the description thereof is omitted here.
[0158]
Next, the control unit 330 generates a control parameter based on the input volume value, the
determination result from the audio / music determination unit 120, and the genre group whose
genre information has been determined, and this control parameter is used as an acoustic
amplifier Output to 110. The operation in the acoustic amplification unit 110 to which the
control parameter has been input is as described in the first embodiment.
[0159]
(State Transition Based on Volume Value, Genre Information, and Determination Result) The
amplification factor in the acoustic amplification unit 110 based on the control parameter from
the control unit 330 will be described below with reference to FIG. FIG. 10 is an explanatory view
showing a relationship between a volume value input by the control unit 330, a group of genre
information, a determination result from the audio / music determination unit 120, and an
amplification factor having frequency characteristics in the acoustic amplification unit 110. .
[0160]
08-05-2019
46
As shown in the figure, when the television 10 equipped with the audio output conversion device
300 is powered on, the audio output conversion device 300 inputs genre information of the
received broadcast program from the separation unit 32. The audio output device 300
determines a group of genres corresponding to the input genre information in the control unit
330 provided therein.
[0161]
(When the genre information is a genre of voice system) Here, when the group of the determined
genre is a group of genre of voice system, the control unit 330 sets the state of the amplification
factor in the sound amplification unit 110 to the state The control parameter is output to the
acoustic amplification unit 110 so as to be 331A. When the frequency characteristic of the
amplification factor in the acoustic amplification unit 110 corresponding to the state 331A is
shown in a graph, it becomes a characteristic graph 340A shown in the figure. In the frequency
characteristic of the amplification factor shown in the characteristic graph 340A, the lower the
input volume value, the higher the amplification factor of the midrange in the frequency of the
sound included in the audio data than the amplification factor of the lowband and highband To
be controlled by the control unit 330. In other words, the control unit 330 controls the acoustic
amplification unit 110 to emphasize the middle band more than the low band and the high band
as the input volume value decreases.
[0162]
Here, when the control unit 330 inputs the determination result that the audio flag is 0 and the
music flag is 1 from the audio / music determination unit 120, the control unit 330 determines
the state of the amplification factor in the audio amplification unit 110, The control parameter is
output to the acoustic amplification unit 110 so as to be in the state 332B. A graph showing the
frequency characteristic of the amplification factor corresponding to the state 332B is a
characteristic graph 341B. In the frequency characteristic of the amplification factor shown in
the characteristic graph 341B, as the input volume value decreases, the low and high frequency
amplification factors in the frequency of the sound included in the audio data are higher than the
amplification factor of the midrange To be controlled by the control unit 330. In other words, as
the input volume value decreases, the control unit 330 controls the acoustic amplification unit
110 so as to emphasize the low band and the high band more than the mid band.
[0163]
08-05-2019
47
When the control unit 330 determines that the input genre information is a group of audio
system genres, the determination result from the audio / music determination unit 120 is that
the audio flag is 0 and the music flag is 1 In this case, the state of the amplification factor in the
acoustic amplification unit 110 is the state 332 B, and when the determination result from the
audio / music determination unit 120 is other than 0 for the audio flag and 1 for the music flag,
the amplification ratio state in the acoustic amplification unit 110 Becomes the state 331A.
[0164]
(When the Genre Information is a Music Genre Genre) Next, in the control unit 330, the state of
the amplification factor in the sound amplification unit 110 when the input genre information is
a music genre group will be described. .
[0165]
When the control unit 330 determines that the input genre information is a music genre group,
the control parameter is sent to the sound amplification unit 110 so that the amplification factor
state in the sound amplification unit 110 becomes the state 331B. Output.
When the frequency characteristic of the amplification factor in the acoustic amplification unit
110 corresponding to the state 331B is shown in a graph, it becomes a characteristic graph
340B shown in the figure.
The smaller the input volume value is, the higher the amplification factor of the low band and the
high band at the frequency of the sound included in the audio data is higher than the
amplification factor of the mid band as the frequency characteristic of the amplification factor
shown in the characteristic graph 340B decreases. To be controlled by the control unit 330. In
other words, as the input volume value decreases, the control unit 330 controls the acoustic
amplification unit 110 so as to emphasize the low band and the high band more than the mid
band.
[0166]
Here, when the control unit 330 inputs the determination result that the sound flag is 1 and the
music flag is 0 from the sound and music determination unit 120, the control unit 330 sets the
08-05-2019
48
state of the amplification factor in the sound amplification unit 110 as follows. The control
parameter is output to the acoustic amplification unit 110 so as to be in the state 332A. A graph
showing the frequency characteristic of the amplification factor corresponding to the state 332A
is a characteristic graph 341A. As the frequency characteristic of the amplification factor shown
in the characteristic graph 341A decreases, as the input volume value decreases, the
amplification factor of the midrange in the frequency of the sound included in the audio data is
higher than the amplification factor of the lowband and highband It is controlled by the control
unit 330 as follows. In other words, the control unit 330 controls the acoustic amplification unit
110 to emphasize the middle band more than the low band and the high band as the input
volume value decreases.
[0167]
When the control unit 330 determines that the input genre information is a music genre group,
the determination result from the audio / music determination unit 120 indicates that the audio
flag is 1 and the music flag is 0. In this case, the amplification factor state in the acoustic
amplification unit 110 is the state 332A, and the determination result from the audio / music
determination unit 120 indicates that the amplification factor state in the acoustic amplification
unit 110 when the audio flag is other than 1 and the music flag Becomes the state 331B.
[0168]
(When the genre information is not an audio system nor a music system) Next, in the control unit
330, an acoustic amplification unit when the input genre information is a group of genres other
than an audio system and a music system. The state of the amplification factor at 110 will be
described.
[0169]
When the control unit 330 determines that the input genre information is a group of genres that
are neither a voice system nor a music system, the control parameter is set to acoustic so that the
state of amplification factor in the acoustic amplification unit 110 becomes state 331C. The
signal is output to the amplification unit 110.
If the frequency characteristic of the amplification factor in the acoustic amplification unit 110
corresponding to the state 331C is shown in a graph, it becomes a characteristic graph 340C
shown in the figure.
08-05-2019
49
The frequency characteristic of the amplification factor shown in the characteristic graph 340C
is controlled by the control unit 330 such that the amplification factor of low to high frequencies
in the frequency of the sound included in the audio data becomes constant. That is, the control
unit 330 controls the acoustic amplification unit 110 so that the frequency characteristic of the
sound frequency included in the audio data does not emphasize a specific band.
[0170]
Here, when the control unit 330 inputs the determination result that the sound flag is 1 and the
music flag is 0 from the sound and music determination unit 120, the control unit 330 sets the
state of the amplification factor in the sound amplification unit 110 as follows. The control
parameter is output to the acoustic amplification unit 110 so as to be in the state 333A. A graph
showing the frequency characteristic of the amplification factor corresponding to the state 333A
is a characteristic graph 342A. The smaller the input volume value is, the higher the
amplification factor of the midrange in the frequency of the sound included in the audio data is
higher than the amplification factor of the lowband and highband as the frequency characteristic
of the amplification factor shown in the characteristic graph 342A decreases. It is controlled by
the control unit 330 as follows. In other words, the control unit 330 controls the acoustic
amplification unit 110 to emphasize the middle band more than the low band and the high band
as the input volume value decreases.
[0171]
On the other hand, when the control unit 330 inputs the determination result that the sound flag
is 0 and the music flag is 1 from the sound and music determination unit 120, the control unit
330 sets the state of the amplification factor in the sound amplification unit 110 to the state The
control parameter is output to the acoustic amplification unit 110 so as to be 333B. A graph
showing the frequency characteristic of the amplification factor corresponding to the state 333B
is a characteristic graph 342B. The smaller the input volume value is, the higher the
amplification factor of the low band and the high band at the frequency of the sound included in
the audio data is higher than the amplification factor of the mid band as the frequency
characteristic of the amplification factor shown in the characteristic graph 342B is smaller To be
controlled by the control unit 330. That is, as the input volume value decreases, the control unit
330 controls the acoustic amplification unit 110 so as to emphasize the low and high frequency
bands more than the mid frequency band.
08-05-2019
50
[0172]
When the control unit 330 determines that the input genre information is a group of genres
other than audio and music, the determination result from the audio / music determination unit
120 indicates that the audio flag is 1 and the music flag. Is 0, the state of the amplification factor
in the acoustic amplification unit 110 is state 333A, and when the judgment result from the
audio / music judgment unit 120 is that the speech flag is 0 and the music flag is 1, the acoustic
amplification factor 110 is The state of amplification factor in the state becomes state 333 B, and
when the determination result from the audio / music determination unit 120 indicates that both
the audio flag and the music flag are 0 or both the audio flag and the music flag are 1,
amplification in the acoustic amplification unit 110 is performed. The state of the rate is state
331C.
[0173]
Further, comparing the frequency characteristics of the amplification factor when the same
volume value is input in the characteristic graphs 341B and 342B and the characteristic graph
340B, the frequency characteristic of the amplification factor in the characteristic graph 340B is
lower and higher The band is more emphasized.
[0174]
Furthermore, comparing the frequency characteristics of the amplification factor when the same
volume value is input in the characteristic graphs 341A and 342A and the characteristic graph
340A, the frequency characteristic of the amplification factor in the characteristic graph 340A is
in the middle band. , Has become more emphasized.
[0175]
As described above, in the audio output conversion apparatus 300, since the frequency
characteristic of the amplification factor in the acoustic amplification unit 110 is controlled
based on the volume value, the audio / music determination unit 120, and the genre information,
the speaker Even when the volume of the sound to be output is smaller than 60, it is possible to
make it easy to hear the human voice which is the sound to be output, and to suppress the
deterioration of the realism of the music which is the sound to be output.
[0176]
In the present embodiment, when control unit 330 inputs an audio flag of 0 and a music flag of 1
from audio / music determination unit 120, control unit 330 transmits audio data to audio
amplification unit 110. Control parameters are output to emphasize the low and high frequency
08-05-2019
51
bands above the mid frequency band in the sound frequencies included in, but to emphasize only
one of the low or high frequency bands Control parameters may be output.
[0177]
The control parameters output by the control unit 330 to the acoustic amplification unit 110 are
the same as the control parameters output by the control unit 130 described in the first
embodiment, and thus the description thereof will be omitted in the third embodiment. .
[0178]
Although omitted in FIG. 10, when the program changes when the program is switched or the
channel is changed, the genre determination operation is performed as in the case where the
power is turned on.
In addition, the voice flag and the music flag to be input are operated in real time.
Here, in order to reduce a sense of incongruity when switching the state, the frequency
characteristic may be gradually increased or decreased.
[0179]
The present invention is not limited to the above-described embodiments, and various
modifications can be made within the scope of the claims, and embodiments obtained by
appropriately combining the technical means disclosed in the different embodiments. Is also
included in the technical scope of the present invention.
[0180]
The present invention relates to an audio reproduction apparatus that amplifies an acoustic
signal by a predetermined amplification factor, and can control the frequency characteristic of
the amplification factor based on the type of sound included in the acoustic signal and the
volume value selected by the user. In particular, the present invention can be used in devices that
output sound such as mobile phones and liquid crystal televisions.
[0181]
08-05-2019
52
It is a block diagram which shows the structure of the audio output conversion apparatus based
on one Embodiment of this invention.
FIG. 1 is a block diagram showing the configuration of a television equipped with an audio output
conversion device according to an embodiment of the present invention.
It is explanatory drawing which shows the frequency characteristic of the amplification factor in
an acoustic amplification part based on one Embodiment of this invention.
(A) And (b) is a block diagram which shows the structure of an acoustic amplification part based
on one Embodiment of this invention.
(A) is explanatory drawing which shows the control parameter which a control part outputs
based on one Embodiment of this invention, (b) is explanatory drawing which shows the
structure of an equalizer based on Embodiment of this invention It is.
It is a block diagram which shows the structure of the audio output conversion apparatus based
on other embodiment of this invention.
It is explanatory drawing which shows the group division of the genre of the broadcast program
based on other embodiment of this invention. It is explanatory drawing which shows the
frequency characteristic of the amplification factor in an acoustic amplification part based on
other embodiment of this invention. It is a block diagram which shows the structure of the audio
output conversion apparatus based on the further another embodiment of this invention. It is
explanatory drawing which shows the frequency characteristic of the amplification factor in an
acoustic amplification part based on another embodiment of this invention.
Explanation of sign
[0182]
DESCRIPTION OF SYMBOLS 100 audio output conversion apparatus (sound reproduction
08-05-2019
53
apparatus) 110 acoustic amplification part (amplification means) 110a acoustic amplification
part (amplification means) 110b acoustic amplification part (amplification means) 120 audio |
voice music determination part (determination means) 130 control part (control means) 130a
control unit (control means) 130b control unit (control means) 200 audio output conversion
device (sound reproduction device) 230 control portion (control means) 300 audio output
conversion device (sound reproduction device) 330 control portion (control means)
08-05-2019
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