close

Вход

Забыли?

вход по аккаунту

?

JP2013207704

код для вставкиСкачать
Patent Translate
Powered by EPO and Google
Notice
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
financial decisions, should not be based on machine-translation output.
DESCRIPTION JP2013207704
Abstract: The present invention provides an audio signal reproduction apparatus that suppresses
distortion of a speaker output sound and reproduces a sound with a maintained bass feeling. A
band-by-band gain adjustment unit 3 performs gain adjustment using a band-by-band gain for
each band of an input audio signal, and a harmonic generation unit 1 for acquiring harmonic
component signals of a bass component signal from an audio signal And the multiplier 2 for
multiplying the harmonic component signal acquired by the harmonic generation unit 1 by the
harmonic gain to adjust the gain, and the values of the band-specific gain and the harmonic gain
according to the reproduction volume of the audio signal. And a gain control unit 7 for
calculating. [Selected figure] Figure 1
Audio signal reproduction device
[0001]
The present invention relates to an audio signal reproduction technique, and more particularly to
an audio signal reproduction device for improving the reproduction quality of a bass component.
[0002]
In the audio signal reproduction apparatus, when the reproduction volume is increased, the
output sound of the speaker is likely to be distorted by exceeding the reproduction limit of the
speaker, and the reproduction sound quality may be deteriorated.
08-05-2019
1
As a technique for reducing distortion of the output sound of the speaker at the time of volume
rise of the audio signal reproduction device, for example, Patent Document 1 describes an audio
that controls the gain of the bass component and the high-tone component of the input signal
according to the set volume An output control device is disclosed.
[0003]
The audio output control device disclosed in Patent Document 1 determines a gain adjustment
unit that adjusts the sound pressure of the bass component and the treble component of the
input signal, and determines the set volume of the audio signal reproduction device, and the
above gain according to the determination result. It is comprised from the gain control part
which changes the gain setting value of an adjustment part. Thus, when it is determined that the
volume set by the audio signal reproducing apparatus exceeds the reproduction limit of the
speaker and the output sound of the speaker is distorted, the above-mentioned gain adjustment
unit suppresses the bass component and the treble component of the input signal. By setting
such gain, it is difficult to distort the output sound of the speaker.
[0004]
JP-A-11-27069
[0005]
However, according to the technology disclosed in Patent Document 1 described above, the
sound pressure of the bass component is suppressed as the volume increases, so the speaker
output sound is less likely to be distorted, but on the other hand There was a problem of giving
to.
[0006]
The present invention has been made to solve the above-mentioned problems, and an object
thereof is to provide an audio signal reproduction apparatus which suppresses distortion of a
speaker output sound and reproduces a sound maintaining a feeling of bass. .
[0007]
The audio signal reproduction apparatus according to the present invention acquires the
harmonic component signal of the bass component signal from the audio signal, and the bandspecific gain adjustment unit that performs gain adjustment using the band-specific gain for each
08-05-2019
2
band of the input audio signal. A harmonic acquisition unit and a harmonic component signal
acquired by the harmonic acquisition unit are multiplied by a harmonic gain to perform gain
adjustment, and a band-specific gain and a harmonic gain are provided according to the
reproduction volume of the audio signal. And a gain control unit that calculates a value.
[0008]
According to the present invention, when the reproduction volume is large, it is possible to
suppress the bass component of the output signal to reduce the distortion of the speaker and to
reproduce the bass component in a pseudo manner to maintain the bass feeling.
[0009]
FIG. 1 is a block diagram showing a configuration of an audio signal reproduction device
according to a first embodiment.
3 is a flowchart showing the operation of the audio signal reproduction device according to the
first embodiment.
FIG. 6 is a diagram showing sound pressure characteristics of an output signal of the audio signal
reproduction device according to the first embodiment.
FIG. 7 is a block diagram showing a configuration of an audio signal reproduction device
according to a second embodiment.
7 is a flowchart showing the operation of the audio signal reproduction device according to the
second embodiment.
[0010]
Embodiment 1
08-05-2019
3
FIG. 1 is a block diagram showing a configuration of an audio signal reproduction device
according to a first embodiment of the present invention. The audio signal reproduction
apparatus 100 generates from the harmonic generation unit 1 (harmonic acquisition unit) 1 that
generates harmonic component signals of the bass component signal included in the input signal
from the audio signal that is the input signal. Multiplier 2 for gain adjustment of the harmonic
component signal, band-by-band gain adjustment unit 3 for gain-by-band adjustment of the input
signal to generate the band-by-band gain adjustment signal, and harmonics whose gain is
adjusted by the multiplier 2 Adder 4, which adds the component signal and the band-by-band
gain adjustment signal output from band-by-band gain adjustment unit 3, to generate an effect
imparting signal, multiplier 5 which adjusts the gain of the effect imparting signal The gain
control unit 7 calculates the gain to be adjusted by the multiplier 2 and the band-by-band gain
adjustment unit 3 according to the volume information acquisition unit 6 that acquires the
volume information to be represented, and the multiplication by the multiplier 5 Composed of
the volume control unit 8 which calculates a that gain.
[0011]
Next, the operation of the audio signal reproduction device 100 will be described. FIG. 2 is a flow
chart showing the operation of the audio signal reproduction apparatus according to the first
embodiment of the present invention. The harmonic generation unit 1 generates a harmonic
component signal of the bass component signal included in the input signal from the audio signal
which is the input signal, and outputs the harmonic component signal to the multiplier 2 (step
ST1). As a method of generating the harmonic component signal of the harmonic generation unit
1, a bass component signal lower than the lowest resonance frequency of a speaker (not shown)
is extracted from the input signal, and the harmonic component is peak-held, full-wave rectified,
half What is necessary is just to generate | occur | produce by waveform modification, such as
wave rectification, n-times multiplication (n is an integer) of a bass component signal, division,
etc., and produce both an odd harmonic component and an even harmonic component. In
addition, when the harmonic component of the bass component below the lowest resonance
frequency of the speaker is included in the input signal, a method of extracting the harmonic
component and using it as a harmonic component signal may be used.
[0012]
In step ST1, the multiplier 2 multiplies the harmonic component signal output from the harmonic
generation unit 1 by the harmonic gain output from the gain control unit 7 and outputs the
result to the adder 4 (step ST2). The per-band gain adjustment unit 3 adjusts the gain of the
08-05-2019
4
input signal with the per-band gain output from the gain control unit 7, and outputs the per-band
gain adjustment signal generated as a result to the adder 4 (step ST3). Here, the gain adjustment
by band is a process for reducing distortion of the speaker output sound mainly when the volume
is raised, and the method is to divide each band after band division by the low pass filter, high
pass filter, and band pass filter. The sound pressure of the bass component and the treble
component is suppressed by using gain adjustment or shelving filter.
[0013]
The adder 4 adds the gain-adjusted harmonic component signal output in step ST2 and the bandspecific gain adjustment signal output in step ST3 to generate an effect imparting signal, and
outputs the resultant to the multiplier 5 (step ST4). ). The multiplier 5 performs gain adjustment
of the effect imparting signal output in step ST4 with the volume gain output from the volume
control unit 8, outputs the adjustment result as an output signal (step ST5), and ends the
processing.
[0014]
In addition to the operation shown in the flowchart of FIG. 2, the volume information acquisition
unit 6, the gain control unit 7, and the volume control unit 8 perform the following operation.
The volume information acquisition unit 6 acquires volume information set by the audio signal
reproduction device 100 at preset intervals, and outputs the volume information to the gain
control unit 7 and the volume control unit 8. The gain control unit 7 calculates the harmonic gain
of the harmonic component signal whose gain is adjusted by the multiplier 2 based on the
volume information output from the volume information acquisition unit 6 and adjusts the gain
by the band-by-band gain adjustment unit 3 The band-specific gain is calculated. The bandspecific gain mainly reduces distortion of the speaker output sound when the volume of the
audio signal reproduction device 100 increases, and suppresses, for example, the sound pressure
of a bass component signal below the lowest resonance frequency of the speaker. The harmonic
gain changes the additional intensity of the harmonic component signal, and the harmonic
component signal compensates for the suppression of the sound pressure of the bass component
signal by the band-specific gain. The volume control unit 8 calculates a volume gain based on the
volume information output from the volume information acquisition unit 6.
[0015]
08-05-2019
5
FIG. 3 is a diagram showing sound pressure characteristics of the output signal of the audio
signal reproduction device according to the first embodiment of the present invention. The
setting image of the band-specific gain and the harmonic gain will be described based on the
image diagram of the sound pressure characteristic shown in FIG. 3. In FIG. 3, the horizontal axis
represents frequency [Hz] and the vertical axis represents sound pressure [dB]. When setting the
band-specific gain and the harmonic gain, it is assumed that the reference volume is the
reference volume, the band-specific gain and the harmonic gain at the reference volume are each
0 dB, and the sound pressure characteristic is flat. When the volume is higher than the reference
volume, the band-specific gain is reduced to suppress the sound pressure of the bass component
signal, and the harmonic gain is increased to compensate the suppression of the bass component
signal with the harmonic component signal. To increase the sound pressure of the harmonic
component signal. On the other hand, when the volume is smaller than the reference volume, the
sensitivity of the bass becomes worse as the volume becomes smaller as the characteristic of the
human ear, so the band-specific gain is increased. The harmonic gain in this case is −∞ dB.
[0016]
As described above, the gain control unit 7 refers to the volume information acquired by the
volume information acquisition unit 6 and determines whether the set volume is higher than the
reference volume, which is the reference volume, or higher than the reference volume. Calculate
the wave gain and the per-band gain. Therefore, the multiplier 2 and the band-by-band gain
adjustment unit 3 can perform multiplication of the gain to the harmonic component signal or
gain adjustment of the input signal according to whether it is larger or smaller than the reference
volume. It is possible to suppress the reduction of distortion and bass.
[0017]
As described above, according to the first embodiment, the gain control unit 7 that calculates the
harmonic gain and the band-specific gain based on the volume information, and the
multiplication that multiplies the harmonic component signal by the calculated harmonic gain
And the band-by-band gain adjusting unit 3 for adjusting the gain of the input signal with the
calculated band-by-band, so that when the volume of the audio signal reproduction device 100 is
larger than the reference volume, The bass component of the output signal of is suppressed, and
distortion of the output sound of the speaker can be reduced. Further, since the suppression of
the bass component is compensated by the harmonic component, the bass component which is
difficult to reproduce by the speaker can be reproduced in a pseudo manner, and the bass feeling
08-05-2019
6
can be maintained.
[0018]
Second Embodiment FIG. 4 is a block diagram showing a configuration of an audio signal
reproduction device according to a second embodiment of the present invention. In the first
embodiment described above, the configuration for inputting the input signal to the harmonic
wave generation unit 1 is shown, but the audio signal reproduction device 100 'of the second
embodiment A bass component signal output from 12 is input to the harmonic generation unit
15. In the following, parts identical or corresponding to the constituent elements of audio signal
reproduction apparatus 100 according to Embodiment 1 will be assigned the same reference
numerals as those used in Embodiment 1 to omit or simplify the description.
[0019]
The band-specific gain adjustment unit 11 divides the audio signal, which is an input signal, into
high- and low-tone components and low-tone components, and the multiplier (first multiplier) 13
performs gain adjustment of the low-tone components. And an adder 14 that adds the highpitched component signal and the bass component signal subjected to gain adjustment to output
a band-specific gain adjustment signal. The harmonic generation unit 15 generates a harmonic
component signal of the bass component signal output from the band division processing unit
12.
[0020]
The gain control unit 7 ′ calculates high-pitched component gain to be gain-adjusted by the
multiplier (second multiplier) 2 according to the volume information acquired by the volume
information acquisition unit 6, and performs bass adjustment by the multiplier 13. Calculate
component gains. The bass component gain sets the gain of the bass component signal small so
as to reduce distortion of the output sound of the speaker when the volume is set larger than the
reference volume, and suppresses the sound pressure of the bass component signal. The
harmonic gain is the same as that of the first embodiment described above, and is to change the
additional intensity of the harmonic component signal, and the portion for which the sound
pressure of the bass component signal is suppressed by the band-specific gain is the harmonic
component signal. compensate.
08-05-2019
7
[0021]
Next, the operation of the audio signal reproduction device 100 'will be described. FIG. 5 is a flow
chart showing the operation of the audio signal reproduction device according to the second
embodiment of the present invention. The per-band gain adjustment unit 11 inputs an audio
signal, which is an input signal, to the band division processing unit 12 (step ST11). The band
division processing unit 12 band divides the input signal input in step ST11 into a treble
component signal and a bass component signal, outputs the treble component signal to the adder
14, and multiplies the bass component signal by the multiplier 13 and harmonic generation It
outputs to the part 15 (step ST12). Here, in the band division processing by the band division
processing unit 12, the lowest resonance frequency of the speaker is divided into a bass
component signal and a treble component signal as a cutoff frequency.
[0022]
The multiplier 13 adjusts the gain of the bass component signal output in step ST12 with the
bass component gain output from the gain control unit 7 ′, and outputs the generated bass
component signal to the adder 14 (step ST13). . The adder 14 adds the high-tone component
signal output in step ST12 and the bass component signal whose gain is adjusted output in step
ST13, and outputs the addition result of the band-by-band gain adjustment signal to the adding
unit 4 ( Step ST14).
[0023]
The harmonic generation unit 15 generates a harmonic component signal of the bass component
signal output in step ST12 and outputs the harmonic component signal to the multiplier 2 (step
ST15). As a method of generating a harmonic component signal, a bass component signal below
the lowest resonance frequency of the speaker is extracted from the input signal, and the
harmonic component is peak hold, waveform deformation such as full wave rectification, half
wave rectification, etc., bass component The signal may be generated by n times multiplication (n
is an integer), division and the like to generate both the odd harmonic component and the even
harmonic component.
08-05-2019
8
[0024]
In step ST15, the multiplier 2 multiplies the harmonic component signal output from the
harmonic generation unit 15 by the harmonic gain output from the gain control unit 7 ′, and
outputs the result to the adder 4 (step ST16). The adder 4 adds the per-band gain adjustment
signal output in step ST14 and the harmonic component signal generated in step ST16 to
generate an effect imparting signal, and outputs the effect imparting signal to the multiplier 5
(step ST17). The multiplier 5 performs gain adjustment of the effect imparting signal output in
step ST17 with the volume gain output from the volume control unit 8, outputs the adjustment
result as an output signal (step ST18), and ends the processing.
[0025]
Further, similarly to the first embodiment, the volume information acquisition unit 6, the gain
control unit 7 'and the volume control unit 8 perform the following operations separately from
the operation shown in the flowchart of FIG. The volume information acquisition unit 6 acquires
volume information set by the audio signal reproduction device 100 ′ at preset intervals, and
outputs the volume information to the gain control unit 7 ′ and the volume control unit 8. The
gain control unit 7 ′ calculates the harmonic gain of the harmonic component signal to be gainadjusted by the multiplier 2 based on the volume information output from the volume
information acquisition unit 6, and performs bass adjustment by the multiplier 13. Calculate
component gains. The volume control unit 8 calculates a volume gain based on the volume
information output from the volume information acquisition unit 6.
[0026]
Thus, the gain control unit 7 ′ refers to the volume information acquired by the volume
information acquisition unit 6 and determines whether the set volume is higher than the
reference volume, which is the reference volume, or smaller than the reference volume. Calculate
harmonic gain and bass component gain. Therefore, the multiplier 2 and the multiplier 13 can
perform multiplication of the gain to the harmonic component signal or gain adjustment of the
bass component signal of the input signal depending on whether they are larger or smaller than
the reference volume, and the output sound Distortion and the reduction between the bass can
be suppressed.
08-05-2019
9
[0027]
As described above, in the second embodiment, the gain control unit 7 ′ that calculates the
harmonic gain and the bass component gain based on the volume information, and the
harmonics of the harmonic component signal generated by the harmonic generation unit 15.
Since the multiplier 2 that performs gain adjustment by gain and the band-specific gain
adjustment unit 11 that generates the band-specific gain adjustment signal by the bass
component gain are configured, the volume of the audio signal reproduction device 100 ′ is
large Can suppress the bass component of the output signal and reduce distortion of the output
sound of the speaker. Further, since the suppression of the bass component is compensated by
the harmonic component, the bass component which is difficult to reproduce by the speaker can
be reproduced in a pseudo manner, and the bass feeling can be maintained.
[0028]
In the scope of the invention, the present invention allows free combination of each embodiment,
or modification of any component of each embodiment, or omission of any component in each
embodiment. .
[0029]
1, 15 harmonic generation units, 2, 5, 13 multipliers, 3, 11 band-by-band gain adjustment units,
4, 14 adders, 6 volume information acquisition units, 7, 7 'gain control units, 8 volume control
units, 12 band division processing unit, 100, 100 'audio signal reproduction device.
08-05-2019
10
Документ
Категория
Без категории
Просмотров
0
Размер файла
19 Кб
Теги
jp2013207704
1/--страниц
Пожаловаться на содержимое документа