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JP2003199185

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DESCRIPTION JP2003199185
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
audio reproduction apparatus, an audio reproduction program and an audio reproduction
method for correcting an audio signal from a sound source in order to reproduce an audio
equivalent to an original audio. The present invention relates to an audio reproduction apparatus,
an audio reproduction program, and an audio reproduction method for correcting an audio signal
from a sound source in response.
[0002]
2. Description of the Related Art A conventional sound reproducing apparatus has a
predetermined time constant, and when the noise level fluctuates, the amplification level for the
sound signal (hereinafter referred to as the source signal) which is the source of the loud sound
is referred to as the noise level. Corresponding to this, it is designed to change stepwise by a
predetermined amount of fluctuation.
[0003]
An example of such a conventional sound reproduction apparatus is shown in FIG.
Referring to FIG. 11, in the conventional sound reproducing apparatus 1100, a source signal
input terminal 1101 receives a source signal from a sound source 1151, an amplification means
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1110 amplifies the source signal to generate a loudspeaker sound signal, and a loudspeaker
sound signal output terminal A speaker 1102 outputs a loud sound signal to the speaker 1152.
Further, the sound pickup signal input terminal 1103 receives a sound pickup signal including a
noise component from the microphone 1153, and the noise component extraction means 1121
extracts the noise component from the sound pickup signal to calculate the noise level and
amplify it. The degree updating unit 1125 changes the amplification degree with respect to the
source signal in a stepwise manner with a predetermined variation amount that is predetermined
according to the noise level.
[0004]
In the conventional sound reproducing apparatus 1100 shown in FIG. 11, for example, when the
noise level is 60 dB, the amplification degree updating means 1125 causes the sound pressure
level of the loud sound which is originally 60 dB to be 65 dB which is 5 dB higher than the noise
level. In addition, the amplification degree for the source signal is stepwise changed with a
predetermined constant fluctuation amount. Further, when the noise level further increases from
60 dB to 65 dB, the amplification degree updating unit 1125 causes the amplification degree to
be 70 dB, which is 5 dB higher than the noise level, with a predetermined variation amount. Vary
stepwise. Specifically, the loud-speaking sound in steps of 0.5 dB from 65 dB to 65.5 dB, 66 dB,
66.5 dB, 67 dB, 67.5 dB, 68 dB, 68.5 dB, 69 dB, 69.5 dB, 70 dB and so on In order to increase the
sound pressure level, the amplification degree is changed stepwise by a predetermined fixed
amount of fluctuation so as to avoid a rapid change of the loud sound.
[0005]
However, such a conventional sound reproducing apparatus is previously used, for example, in
an environment such as a stadium, when the noise level is rapidly increased and the minimum
audible value is rapidly increased. There is a problem that the sound pressure level of the loud
sound does not rise in time because it is fluctuated by a fixed amount of fluctuation, and the user
can not listen to the loud sound sufficiently. Also, in such an environment, while raising the
sound pressure level of the loud sound in steps, when the noise level that has once risen sharply
drops and the minimum audible value sharply decreases, the loud sound is There is a problem
that it is protruded and gives a sense of incongruity to the user.
[0006]
The present invention has been made to solve such problems. Even when noise fluctuates gently,
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even if noise fluctuates rapidly, the user may feel discomfort. Abstract: A sound reproduction
apparatus, a sound reproduction program, and a sound reproduction method, capable of causing
a user to sufficiently hear a loud sound without giving the sound.
[0007]
SUMMARY OF THE INVENTION A sound reproducing apparatus according to the present
invention is a sound reproducing apparatus for outputting a loud sound, comprising:
amplification means for amplifying a sound signal as a source of the loud sound; and
amplification for the sound signal. Noise level extraction means for updating the noise level,
noise component extraction means for extracting the noise component from the sound pickup
signal including noise components, and noise fluctuation amount calculation means for
calculating the noise fluctuation amount for each predetermined time of the noise And
amplification degree variation adjustment means for adjusting the amplification degree variation
of the sound signal based on the noise variation.
[0008]
With this configuration, even if the noise fluctuates slowly, even if the noise fluctuates rapidly,
the user does not feel discomfort and the user can hear the loud sound enough. Can be heard.
[0009]
The sound reproduction apparatus according to the present invention is configured such that the
amplification degree fluctuation amount adjusting means adjusts the amplification degree
fluctuation amount based on the amplification degree fluctuation amount and the noise
fluctuation amount.
[0010]
With this configuration, even if the noise fluctuates gently, even if the noise fluctuates rapidly,
the user may feel discomfort such as a sudden change in the sound pressure level of the loud
sound. And allow the user to hear the loud sound sufficiently.
[0011]
The sound reproducing apparatus according to the present invention comprises storage means
for storing in advance a plurality of candidates for the amplification degree fluctuation amount,
and the amplification degree fluctuation amount adjusting means comprises the amplification
degree fluctuation amount from the plurality of candidates stored beforehand. It has a
configuration to select.
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[0012]
With this configuration, it is possible to update the amplification degree with the amplification
degree fluctuation amount that has been stored in advance, and to prevent the user from feeling
discomfort such as the sound pressure level of the loud sound changes suddenly. it can.
[0013]
In the sound reproduction apparatus according to the present invention, the noise component
extraction unit extracts the noise component for each frequency band, and the noise fluctuation
amount calculation unit calculates the noise fluctuation amount for each frequency band, and the
amplification factor The variation amount adjusting means has a configuration for adding or
subtracting the amplification degree variation amount for each frequency band.
[0014]
According to this configuration, it is possible to allow the user to hear the loud sound sufficiently
while suppressing unnecessary fluctuation of the loud sound.
[0015]
The sound reproduction program according to the present invention comprises a noise
component extraction step of extracting the noise component from a sound pickup signal
including a noise component, and a noise fluctuation amount calculation step of calculating a
noise fluctuation amount with respect to the noise at predetermined intervals. The computer is
configured to cause the computer to execute an amplification degree fluctuation amount
adjusting step of adjusting the amplification degree fluctuation amount of the acoustic signal
based on the noise fluctuation amount.
[0016]
With this configuration, even if the noise fluctuates slowly, even if the noise fluctuates rapidly,
the user does not feel discomfort and the user can hear the loud sound enough. Can be heard.
[0017]
The sound reproduction program according to the present invention comprises a noise
component extraction step of extracting the noise component from a sound pickup signal
including a noise component, and a noise fluctuation amount calculation step of calculating a
noise fluctuation amount with respect to the noise at predetermined intervals. The computer is
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configured to cause the computer to execute an amplification degree fluctuation amount
adjusting step of adjusting the amplification degree fluctuation amount based on the
amplification degree fluctuation amount of the acoustic signal and the noise fluctuation amount.
[0018]
With this configuration, even if the noise fluctuates gently, even if the noise fluctuates rapidly,
the user may feel discomfort such as a sudden change in the sound pressure level of the loud
sound. And allow the user to hear the loud sound sufficiently.
[0019]
The sound reproduction program according to the present invention has a configuration for
selecting the amplification degree fluctuation amount from a plurality of candidates stored in
advance in the amplification degree fluctuation amount adjusting step.
[0020]
With this configuration, it is possible to update the amplification degree with the amplification
degree fluctuation amount that has been stored in advance, and to prevent the user from feeling
discomfort such as the sound pressure level of the loud sound changes suddenly. it can.
[0021]
The sound reproduction program according to the present invention extracts the noise
component for each frequency band in the noise component extraction step, calculates the noise
fluctuation amount for each frequency band in the noise fluctuation amount calculation step, and
the amplification factor In the fluctuation amount adjusting step, the amplification degree
fluctuation amount is adjusted for each frequency band.
[0022]
According to this configuration, it is possible to allow the user to hear the loud sound sufficiently
while suppressing unnecessary fluctuation of the loud sound.
[0023]
The sound reproduction method according to the present invention comprises a noise
component extraction step of extracting the noise component from a sound pickup signal
including a noise component, and a noise fluctuation amount calculation step of calculating a
noise fluctuation amount with respect to the noise at predetermined intervals. An amplification
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degree variation adjustment step is performed to adjust the amplification degree variation of the
acoustic signal based on the noise variation amount.
[0024]
With this configuration, even if the noise fluctuates slowly, even if the noise fluctuates rapidly,
the user does not feel discomfort and the user can hear the loud sound enough. Can be heard.
[0025]
The sound reproduction method according to the present invention comprises a noise
component extraction step of extracting the noise component from a sound pickup signal
including a noise component, and a noise fluctuation amount calculation step of calculating a
noise fluctuation amount with respect to the noise at predetermined intervals. An amplification
degree fluctuation amount adjusting step is provided for adjusting the amplification degree
fluctuation amount based on an amplification degree fluctuation amount of an acoustic signal
and the noise fluctuation amount.
[0026]
With this configuration, even if the noise fluctuates gently, even if the noise fluctuates rapidly,
the user may feel discomfort such as a sudden change in the sound pressure level of the loud
sound. And allow the user to hear the loud sound sufficiently.
[0027]
The sound reproduction method according to the present invention has a configuration in which
the amplification degree fluctuation amount is selected from a plurality of candidates stored in
advance in the amplification degree fluctuation amount adjusting step.
[0028]
With this configuration, it is possible to update the amplification degree with the amplification
degree fluctuation amount that has been stored in advance, and to prevent the user from feeling
discomfort such as the sound pressure level of the loud sound changes suddenly. it can.
[0029]
In the sound reproduction method according to the present invention, the noise component
extraction step extracts the noise component for each frequency band, and the noise fluctuation
amount calculation step calculates the noise fluctuation amount for each frequency band, and the
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amplification factor In the fluctuation amount adjusting step, the amplification degree fluctuation
amount is adjusted for each frequency band.
[0030]
According to this configuration, it is possible to allow the user to hear the loud sound sufficiently
while suppressing unnecessary fluctuation of the loud sound.
[0031]
BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be
described below with reference to the drawings.
[0032]
First Embodiment FIG. 1 is a block diagram showing a first embodiment of a sound reproducing
apparatus according to the present invention.
In FIG. 1, a sound reproducing apparatus 100 includes a source signal input terminal 101
receiving an acoustic signal (hereinafter referred to as a source signal) as a source of a loud
sound from a sound source 151, and amplification means for amplifying the source signal and
outputting it as a loud sound signal. 110, a loud sound signal output terminal 102 for outputting
a loud sound signal to the speaker 152, a sound collection signal input terminal 103 for
receiving a sound collection signal including a noise component from the microphone 153, and
each step of sound reproduction processing described later. It comprises a microcomputer 120
to be executed, a storage unit 130 for storing a program that causes the microcomputer 120 to
execute the steps of the sound reproduction process, and information related to the sound
reproduction process.
Note that the amplification means 110 is the same as the sound quality controller 111 capable of
amplifying the source signal with an amplification factor different for each frequency band in
each frequency band in the audible range, regardless of the frequency band in each frequency
band in the audible range And a volume controller 112 for amplifying the source signal.
Further, the microcomputer 120 has a noise component extraction unit 121, a noise fluctuation
amount calculation unit 122, an amplification degree fluctuation amount adjustment unit 124,
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and an amplification degree update unit 125.
[0033]
The noise component extraction means 121 samples the collected sound signal at predetermined
time intervals, and extracts noise components from the collected sound signal for each frequency
band.
Note that the collected sound signal received from the microphone 153 includes the component
of the loud sound and the component of the noise, and in general, the component of the loud
sound and the component of the noise are different in frequency.
Also, the component of the amplified sound picked up by the microphone 153 is a source signal
amplified by the amplification means 110, amplified as the amplified sound from the speaker
152, and attenuated while being transmitted to the microphone 153 with a characteristic change.
is there.
Specifically, when extracting noise components from such a collected sound signal, the noise
component extraction means 121 divides the collected sound signal into each frequency band in
the audible range, and at the same time, the level of the source signal from the sound source 151
Based on the amplification degree with respect to the source signal, the transfer function
indicating the transmission relationship of the amplified sound until the amplified sound from
the speaker 152 is transmitted to the microphone 153, and the level of the collected signal from
the microphone 153; A noise level indicating the magnitude of noise is calculated for each
frequency band.
[0034]
The noise fluctuation amount calculating means 122 compares the noise level of each frequency
band calculated by the noise component extracting means 121 at predetermined time intervals,
and calculates the noise fluctuation amount for each frequency band.
Further, the noise fluctuation amount calculating means 122 classifies the noise fluctuation
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amount into the time when the noise level is rising and the time when the noise level is falling.
The classified noise fluctuation amounts are stored in the storage means 130 in time series.
[0035]
The amplification degree fluctuation amount adjusting means 124 adjusts the amplification
degree fluctuation amount for each frequency band based on the noise fluctuation amount for
each frequency band.
For example, statistical processing such as calculating the average value of the noise fluctuation
amount in the past several times is performed on the noise fluctuation amount stored in the
storage unit 130, and the amplification degree fluctuation amount proportional to the calculated
noise fluctuation amount is obtained. Adjust the amount of amplification fluctuation to
When the noise level rises, the average value of the noise fluctuation amount at the noise level
rise is used, and when the noise level falls, the average value of the noise fluctuation amount at
the noise level decline is used.
[0036]
The amplification degree updating means 125 updates the amplification degree with respect to
the source signal for each frequency band with the amplification degree fluctuation amount
adjusted for each frequency band by the amplification degree fluctuation amount adjusting
means 124.
Specifically, the amplification degree of the reference is set to the volume controller 112 in the
entire frequency band of the audible range, and the difference between the amplification degree
of the frequency band and the amplification degree of the reference in each frequency band of
the audible range is the sound quality controller Set to 111.
[0037]
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When the noise fluctuation is substantially absent, the amplification degree fluctuation amount
adjusting means 124 does not adjust the amplification degree fluctuation amount, so the
amplification degree updating means 125 updates the amplification degree with a predetermined
amplification degree fluctuation amount.
Specifically, the amplification degree variation adjustment means 124 compares the width of the
noise variation with a predetermined threshold, and when the width of the noise variation is
within the predetermined threshold, noise variation is substantially absent. By judging and not
adjusting the amplification degree fluctuation amount, the loud sound is prevented from being
heard in a blurry manner.
Further, the amplification degree fluctuation amount adjusting means 124 determines whether
or not the noise fluctuation amount has risen continuously for a predetermined number of times
or more (or whether or not it has continuously dropped for a predetermined number of times or
more). When it is not a continuous rise (or a continuous fall more than a predetermined number
of times), it is determined that the noise fluctuation is substantially absent and the amplification
degree fluctuation amount is not adjusted, so that the loud sound is not heard.
Further, the amplification degree variation adjustment means 124 limits the amplification degree
variation not to exceed the predetermined upper limit, and limits the amplification degree
variation not to fall below the predetermined lower limit. Will not change rapidly.
[0038]
FIG. 2 shows an example of the noise level 202 calculated by the noise component extraction
unit 121 and the noise fluctuation amount 206 calculated by the noise fluctuation amount
calculation unit 122.
Note that the noise fluctuation amount 206 in FIG. 2 shows the inclination of the noise level at
time T1 as an example, and specifically, it is obtained by calculating the difference between the
noise levels between time T0 and time T1. It is.
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FIG. 3 shows a table in which the noise level and the noise fluctuation amount are registered in
time series.
This table is stored in the storage means 130 of FIG.
Further, as shown in FIG. 3, the noise fluctuation amount is classified into the time of the noise
level rising and the noise level falling and registered in the table.
Although FIGS. 2 and 3 show from time T0 to time T8, naturally, after time T8, they are similarly
stored in the storage means 130.
[0039]
FIG. 4 is a flowchart showing sound reproduction processing in the first embodiment of the
sound reproduction device according to the present invention.
Each step of the sound reproduction processing shown in FIG. 4 is executed by the
microcomputer 120 by a program stored in advance in the storage means 130 of FIG.
The sound reproduction process shown in FIG. 4 is started by the microcomputer 120 at
predetermined time intervals.
[0040]
In FIG. 4, first, noise components are extracted from the collected sound signal for each
frequency band.
(402)。
Specifically, the sound pickup signal is divided into each frequency band in the audible range,
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and the level of the source signal from the sound source 151, the amplification degree with
respect to the source signal, the amplified sound from the speaker 152 is transmitted to the
microphone 153 Based on the transfer function indicating the transmission relationship of the
loud sound up to and the level of the sound collection signal from the microphone 153, the noise
level indicating the noise level is calculated for each frequency band.
[0041]
Next, the noise level for each frequency band is compared with the noise level in the past, and
the noise fluctuation amount is calculated for each frequency band (404).
Further, the calculated noise fluctuation amount is classified into the time of rise of the noise
level and the time of fall of the noise level, and stored in the storage means 130 in time series.
[0042]
Next, based on the noise fluctuation amount for each frequency band, the amplification degree
fluctuation amount is adjusted for each frequency band (406).
For example, statistical processing such as calculating the average value of the noise fluctuation
amount in the past several times is performed based on the noise fluctuation amount stored in
the storage unit 130, and amplification is performed so as to become the amplification degree
Adjust the amount of fluctuation.
When the noise level rises, the average value of the noise fluctuation amount at the noise level
rise is used, and when the noise level falls, the average value of the noise fluctuation amount at
the noise level decline is used.
[0043]
Next, the amplification degree with respect to the source signal is updated for each frequency
band with the amplification degree variation amount adjusted for each frequency band (408).
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Specifically, the amplification degree of the reference is set in the volume controller 112 in the
entire frequency band of the audible range, and the difference between the individual
amplification degree and the amplification degree of the reference in each frequency band of the
audible range is Set
[0044]
The human ear has different sensitivities depending on the frequency. Therefore, when adjusting
the amplification degree fluctuation amount, preferably, based on the noise frequency and the
information on the characteristics of the human ear, when the noise frequency is in a band where
the ear sensitivity is low, The noise frequency is set to be smaller than the variation of
amplification in the case where the sensitivity of the human ear is high. Further, the closer the
noise frequency to the frequency of the loud sound, the harder it becomes to hear the loud
sound, and the farther the frequency band of the noise and the frequency band of the loud
sound, the easier it becomes to easily distinguish the loud sound. Therefore, when the
amplification degree fluctuation amount is adjusted, preferably, based on the difference between
the noise frequency and the loud sound frequency, the fluctuation amount of the amplification
degree is made larger as the noise frequency and the loudness sound frequency are closer, As the
frequency of the noise and the frequency of the loud noise are further apart, the variation of the
amplification degree is made smaller.
[0045]
As described above, according to the present embodiment, since the amplification factor
fluctuation amount is adjusted based on the noise fluctuation amount, the noise fluctuates
rapidly even if the noise fluctuates gently. Even in such a case, the user can hear the loud sound
sufficiently without giving a sense of incongruity to the user. In addition, noise fluctuation
amounts are classified and stored at the rising and falling times of the noise level, and the
fluctuation pattern of the noise level in the past is analyzed by statistical processing to adjust the
amplification degree fluctuation amount. Furthermore, it is possible to prevent the user from
feeling uncomfortable.
[0046]
Further, in the present embodiment, noise components are extracted from the collected signal for
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each frequency band, noise fluctuation is calculated for each frequency band, and amplification
fluctuation is adjusted for each frequency band. The user can hear the loud sound sufficiently
while suppressing the unnecessary fluctuation of the loud sound. In addition, the amplification
degree fluctuation amount is adjusted based on the noise frequency and the information on the
characteristics of the human ear, and the amplification degree fluctuation amount is adjusted
based on the difference between the noise frequency and the loud sound frequency. Therefore,
the sound pressure level of the loud sound can be made closer to the noise level if necessary
while the fluctuation of the loud sound is further suppressed, and the user can hear the loud
sound more sufficiently.
[0047]
Second Embodiment FIG. 5 is a block diagram showing a second embodiment of the sound
reproducing apparatus according to the present invention. In FIG. 5, the same configuration
requirements as the configuration requirements of the sound reproduction apparatus 100 of the
first embodiment shown in FIG. 1 are denoted by the same reference numerals, and the detailed
description will be omitted.
[0048]
In FIG. 5, the sound reproducing apparatus 500 of this embodiment is different from the sound
reproducing apparatus 100 of the first embodiment shown in FIG. 1 in that the amplification
degree for each frequency band with respect to the source signal is compared at predetermined
time intervals. The amplification degree fluctuation amount calculation means 523 for
calculating the amplification degree fluctuation amount for each frequency band, the noise
fluctuation amount calculation means 122 stores the noise fluctuation amount in time series for
each frequency band in the storage means 530, and the amplification degree The fluctuation
amount calculation means 523 stores the amplification degree fluctuation amount in time series
for each frequency band in the storage means 530, and the amplification degree fluctuation
amount adjustment means 524 controls the amplification degree fluctuation amount and the
noise fluctuation stored in the storage means 530 The amount of variation in amplification
degree is adjusted for each frequency band by comparing with the amount.
[0049]
In general, the amplification degree variation adjustment means 524 makes the amplification
degree variation larger than before when the noise variation is larger than the amplification
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variation, and the amplification degree variation when the noise variation is smaller than the
amplification variation. Make it smaller than before.
However, if the amplification degree fluctuation amount is made to follow the noise fluctuation
amount too much, the loud sound may be heard steadily and the user may feel discomfort.
Therefore, the amplification degree variation adjustment means 524 performs statistical
processing such as calculating the average value of the noise variation in the past several times
to analyze the noise variation pattern, and analyzes the amplification degree variation pattern to
obtain the amplification degree variation. Moderate. Specifically, the amplification degree
variation adjustment means 524 compares the width of the noise variation with a predetermined
threshold, and when the width of the noise variation is within the predetermined threshold, the
noise variation is substantially absent. By judging and not adjusting the amplification degree
fluctuation amount, the loud sound is prevented from being heard in a blurry manner. In
addition, the amplification degree fluctuation amount adjustment means 524 determines whether
the noise fluctuation amount has risen continuously for a predetermined number of times or
more (or whether it has been continuously lowered for a predetermined number of times or
more). When it is not a continuous rise (or a continuous fall more than a predetermined number
of times), it is determined that the noise fluctuation is substantially absent and the amplification
degree fluctuation amount is not adjusted, so that the loud sound is not heard. Further, the
amplification degree fluctuation amount adjusting means 524 limits the amplification degree
fluctuation amount not to exceed the predetermined upper limit value, and restricts the
amplification degree fluctuation amount not to be smaller than the predetermined lower limit
value. Will not change rapidly. In addition, if the amplification level is in the process of being
increased, even if the noise level falls, the amplification level does not immediately fall, but the
inclination at which the amplification level rises is once reduced, and the amplification level
eventually declines. Adjust the amount of amplification fluctuation so that
[0050]
6 shows the noise level 602 calculated by the noise component extraction means 121, the
amplification degree 604 for the source signal in the amplification means 110, the noise
fluctuation amount 606 calculated by the noise fluctuation amount calculation means 122, and
the amplification degree fluctuation amount calculation means 523. An example of the calculated
amplification degree fluctuation 608 is shown. Note that the noise fluctuation amount 606 in
FIG. 6 shows the slope of the noise level at time T1 as an example, and specifically, it is obtained
by calculating the difference between the noise levels between time T0 and time T1. It is. Further,
the amplification degree fluctuation amount 608 in FIG. 6 shows the slope of the amplification
degree at time T2 as an example, and specifically, it is obtained by calculating the difference in
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amplification degree between time T1 and time T2 It is a thing. FIG. 7 shows a table in which the
noise level, amplification degree, noise fluctuation amount and amplification fluctuation amount
are registered in time series. This table is stored in the storage means 530 of FIG. Further, as
shown in FIG. 7, the noise fluctuation amount is classified into an increase in noise level and a
decrease in noise level and registered in the table. Further, as shown in FIG. 7, the amplification
degree fluctuation amount is classified into the time of increase of the noise level and the time of
decrease of the noise level and registered in the table. Although FIGS. 6 and 7 show time T0 to
time T8, naturally, after time T8, they are similarly stored in the storage means 530.
[0051]
FIG. 8 is a flowchart showing sound reproduction processing in the second embodiment of the
sound reproduction device according to the present invention. Each step of the sound
reproduction processing shown in FIG. 8 is executed by the microcomputer 520 by a program
stored in advance in the storage means 530 of FIG. The sound reproduction process shown in
FIG. 8 is started by the microcomputer 520 at predetermined time intervals.
[0052]
In FIG. 8, first, the sound pickup signal is divided into frequency bands in the audible range, and
a noise level indicating the magnitude of noise is calculated for each frequency band (802). Next,
the noise level for each frequency band is compared with the noise level in the past, and the
noise fluctuation amount is calculated for each frequency band (804). Next, the amplification
degree for each frequency band is compared with the past amplification degree, and the
amplification degree fluctuation amount is calculated for each frequency band (805). Next, the
amplification degree fluctuation amount is adjusted for each frequency band based on the
amplification degree fluctuation amount for each frequency band and the noise fluctuation
amount for each frequency band (806). Next, the amplification degree with respect to the source
signal is updated for each frequency band with the amplification degree variation amount
adjusted for each frequency band (808).
[0053]
In addition, when adjusting the amplification degree fluctuation amount, preferably, based on the
noise frequency and the information on the characteristics of the human ear, when the noise
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frequency is in a band where the ear sensitivity is low, the amplification degree fluctuation
amount The noise frequency is set to be smaller than the variation of amplification in the case
where the sensitivity of the human ear is high. In addition, when the amplification degree
fluctuation amount is adjusted, preferably, based on the difference between the noise frequency
and the loud sound frequency, the fluctuation amount of the amplification degree is made larger
as the noise frequency and the loudness sound frequency are closer, As the frequency of the
noise and the frequency of the loud noise are further apart, the variation of the amplification
degree is made smaller.
[0054]
As described above, according to the present embodiment, the amplification factor fluctuation
amount is adjusted based on the amplification factor fluctuation amount and the noise
fluctuation amount, so even if the noise fluctuates gently, Even when the noise fluctuates rapidly,
the user can hear the loud sound sufficiently without giving a sense of discomfort to the user. In
addition, the amplification degree fluctuation amount and the noise fluctuation amount are
classified and stored at the rising and falling times, and the amplification degree fluctuation
amount is adjusted by analyzing the past amplification degree fluctuation pattern and the noise
level fluctuation pattern. As compared with the first embodiment, it is possible to further prevent
the user from feeling uncomfortable.
[0055]
Further, in the present embodiment, noise components are extracted from the collected signal for
each frequency band, noise fluctuation is calculated for each frequency band, and amplification
fluctuation is adjusted for each frequency band. The user can hear the loud sound sufficiently
while suppressing the unnecessary fluctuation of the loud sound. In addition, the amplification
degree fluctuation amount is adjusted based on the noise frequency and the information on the
characteristics of the human ear, and the amplification degree fluctuation amount is adjusted
based on the difference between the noise frequency and the loud sound frequency. Therefore,
the sound pressure level of the loud sound can be made closer to the noise level if necessary
while the fluctuation of the loud sound is further suppressed, and the user can hear the loud
sound more sufficiently.
[0056]
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Third Embodiment A sound reproducing apparatus according to the third embodiment will be
described with reference to FIG. In the sound reproducing apparatus according to the third
embodiment, unlike the sound reproducing apparatus according to the first embodiment, the
storage unit 130 stores a plurality of candidates for the amplification degree fluctuation amount
in advance, and the amplification degree fluctuation amount adjusting unit 124 However, among
the candidates stored in the storage means 130, one having an inclination substantially close to
the noise fluctuation amount is selected as the amplification degree fluctuation amount. The
other configuration requirements are the same as in the first embodiment, and the detailed
description will be omitted.
[0057]
Specifically, the amplification degree fluctuation amount adjusting means 124 performs
statistical processing such as calculation of the average value of the noise fluctuation amount in
the past several times based on the noise fluctuation amount stored in the memory means 130,
and the calculated average value Are compared with the plurality of amplification degree
variation candidates stored in advance in the storage unit 130, and a candidate having a slope
closest to the average value of the noise variation is selected from the candidates. When the
noise level rises, the average value of the noise fluctuation amount at the noise level rise is used,
and when the noise level falls, the average value of the noise fluctuation amount at the noise
level decline is used.
[0058]
As described above, according to the present embodiment, the amplification degree fluctuation
amount is selected from the candidates stored in advance in the storage means 130. Therefore,
amplification is performed with the amplification degree fluctuation amount having a track
record stored in advance in the storage means 130. The degree can be updated, and the user can
be prevented from giving a sense of discomfort such as a sudden change in the sound pressure
level of the loud sound. The other effects are the same as the effects described in the first
embodiment, and the detailed description will be omitted.
[0059]
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Fourth Embodiment A sound reproducing apparatus according to the fourth embodiment will be
described with reference to FIG. The sound reproducing apparatus according to the fourth
embodiment differs from the sound reproducing apparatus according to the second embodiment
in that the storage unit 530 stores a plurality of candidates for the amplification degree
fluctuation amount in advance, and the amplification degree fluctuation amount adjusting unit
524 However, among the candidates stored in the storage means 530, one having a slope
substantially close to the noise fluctuation amount is selected as the amplification degree
fluctuation amount. The other configuration requirements are the same as those of the second
embodiment, and the detailed description will be omitted.
[0060]
Specifically, based on the noise fluctuation amount stored in the storage unit 530, the
amplification degree fluctuation amount adjusting unit 524 performs statistical processing such
as calculation of the average value of the noise fluctuation amount in the past several times, and
the calculated noise fluctuation The average value of the amount is compared with the
amplification degree variation. As a result of comparison, if the noise fluctuation amount is larger
than the amplification degree fluctuation amount, among the candidates stored in the storage
unit 530, the numerical value is larger than the current amplification degree fluctuation amount
and closest to the current amplification degree fluctuation amount. The candidate is selected as a
new amplification degree variation. Further, as a result of comparison, if the noise fluctuation
amount is smaller than the amplification degree fluctuation amount, among the candidates stored
in the storage means 530, it is smaller than the current amplification degree fluctuation amount
and closest to the current amplification degree fluctuation amount. A candidate of numerical
value is selected as a new amplification degree variation. When the noise level rises, the average
value of the noise fluctuation amount at the noise level rise is used, and when the noise level
falls, the average value of the noise fluctuation amount at the noise level decline is used.
[0061]
As described above, according to the present embodiment, the amplification degree fluctuation
amount is selected from the candidates stored in advance in storage means 530. Therefore,
amplification is performed by amplification degree fluctuation amount having a track record
stored in advance in storage means 530. The degree can be updated, and the user can be
prevented from giving a sense of discomfort such as a sudden change in the sound pressure level
of the loud sound. The other effects are the same as the effects described in the second
embodiment, and the detailed description will be omitted.
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[0062]
Fifth Embodiment FIG. 9 is a block diagram showing a fifth embodiment of the sound
reproducing apparatus according to the present invention. In FIG. 9, the same configuration
requirements as the configuration requirements of the sound reproduction apparatus 100 of the
first embodiment shown in FIG. 1 are denoted by the same reference numerals, and the detailed
description will be omitted.
[0063]
In FIG. 9, a sound reproduction apparatus 900 according to this embodiment includes a first
processor 910 having a sound quality controller 111, a volume controller 112, a noise
component extraction unit 121, and an amplification degree update unit 125, and a noise
fluctuation amount. The second processor 920 includes a calculation unit 122, an amplification
degree variation adjustment unit 124, and a storage unit 130.
[0064]
As described above, according to the present embodiment, the first processor 910, which is
responsible for basic functions such as amplification of source signals, update of amplification
degree, and extraction of noise components, calculation of noise fluctuation amount, and
amplification fluctuation As the second processor 920 is configured separately from the second
processor 920, which performs functions such as adjusting the amount of sound, if the second
processor 920 is suitable for each noise environment, acoustics adapted to each noise
environment can be obtained. Reproduction can be easily realized.
The other effects are the same as the effects described in the first embodiment, and the detailed
description will be omitted.
[0065]
Sixth Embodiment FIG. 10 is a block diagram showing a sixth embodiment of the sound
reproduction device according to the present invention. In FIG. 10, the same configuration
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requirements as the configuration requirements of the sound reproduction device 500 of the
second embodiment shown in FIG. 5 are denoted by the same reference numerals, and the
detailed description will be omitted.
[0066]
In FIG. 10, the sound reproduction apparatus 1000 according to the present embodiment
includes a first processor 1010 having a sound quality controller 111, a volume controller 112, a
noise component extraction unit 121, and an amplification degree update unit 125, and a noise
fluctuation amount. The second processor 1020 includes a calculation unit 122, an amplification
degree fluctuation amount calculation unit 523, an amplification degree fluctuation amount
adjustment unit 524, and a storage unit 530.
[0067]
As described above, according to the present embodiment, the first processor 1010, which is in
charge of basic functions such as amplification of source signals, updating of amplification
degree, and extraction of noise components, calculation of noise fluctuation amount,
amplification fluctuation amount The second processor 1020 is separately configured from the
second processor 1020 that is responsible for calculation and addition / deletion of the
amplification degree variation, so it is possible to use the second processor 1020 suitable for
each noise environment individually. It is possible to easily realize sound reproduction adapted to
the noise environment of
The other effects are the same as the effects described in the second embodiment, and the
detailed description will be omitted.
[0068]
(Seventh Embodiment) The sound reproducing apparatus according to the seventh embodiment
differs from the sound reproducing apparatus according to the fifth embodiment in that the
storage unit 130 stores in advance a plurality of candidates for the amplification degree
fluctuation amount. The amplification degree variation adjustment means 124 is configured to
select the amplification degree variation from the candidates stored in the storage means 130.
The other configuration requirements are the same as those of the fifth embodiment, and the
detailed description will be omitted.
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[0069]
As described above, according to the present embodiment, since the amplification degree
fluctuation amount is selected from the candidates stored in advance, it is possible to update the
amplification degree with the amplification degree fluctuation amount having the performance
previously stored, It is possible to prevent the user from feeling uncomfortable such as the sound
pressure level of the loud sound changing rapidly. The other effects are the same as the effects
described in the fifth embodiment, and the detailed description will be omitted.
[0070]
Eighth Embodiment Unlike the sound reproducing device according to the sixth embodiment, in
the sound reproducing device according to the eighth embodiment, the storage unit 530 stores in
advance a plurality of candidates for the amplification degree fluctuation amount. The
amplification degree variation adjustment means 524 is configured to select the amplification
degree variation from among the candidates stored in the storage means 530. The other
configuration requirements are the same as in the sixth embodiment, and the detailed description
will be omitted.
[0071]
As described above, according to the present embodiment, since the amplification degree
fluctuation amount is selected from the candidates stored in advance, it is possible to update the
amplification degree with the amplification degree fluctuation amount having the performance
previously stored, It is possible to prevent the user from feeling uncomfortable such as the sound
pressure level of the loud sound changing rapidly. The other effects are the same as the effects
described in the sixth embodiment, and the detailed description will be omitted.
[0072]
In the above description, the noise component is extracted for each frequency band, the noise
fluctuation amount is calculated for each frequency band, and the amplification degree
08-05-2019
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fluctuation amount is added or decreased for each frequency band, so that the user does not feel
uncomfortable. Although the embodiment configured is shown, the present invention is not
limited to this, and the amplification degree fluctuation amount may be commonly added to or
reduced from all frequency bands. As described above, when amplification variation is commonly
added to all frequency bands, the configuration is simplified as compared to the case where
amplification variation is added to each frequency band, and the present invention can be easily
implemented. Can.
[0073]
In the above description, an embodiment is shown in which the average value of the noise
fluctuation amount is calculated and the amplification degree fluctuation amount is adjusted
based on the noise fluctuation amount average value, but the present invention is not limited to
this. Instead, the noise level fluctuation pattern is analyzed using other statistical processes such
as calculation of the maximum value of noise fluctuation amount and calculation of the minimum
value of noise fluctuation amount, and amplification degree fluctuation amount is calculated
based on the result of this analysis. It may be adjusted.
[0074]
Also, in the above description, although one speaker and one microphone are connected to the
sound reproducing apparatus, the present invention is not limited to this, and a plurality of
speakers and plural microphones are connected to the sound reproducing apparatus. The source
signal may be amplified with a variation in amplification degree depending on the location or
direction of the speaker of each speaker.
[0075]
In the above description, the microcomputer is shown to execute each step of the sound
reproduction process, but the present invention is not limited to this, and a device other than the
microcomputer is caused to execute each step of the sound reproduction process. You may do so.
[0076]
As described above, according to the present invention, even in the case where noise fluctuates
slowly or in the case where noise fluctuates rapidly, the user does not feel discomfort. An audio
reproduction apparatus, an audio reproduction program, and an audio reproduction method,
capable of causing the user to sufficiently hear the loud sound.
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