JP2003199185A - Sound reproduction device, sound reproduction program, and sound reproduction method - Google Patents

Abstract

(57) [Summary] [PROBLEMS] Even if the noise fluctuates rapidly, or even if the noise fluctuates slowly, the user does not feel uncomfortable, and To provide a sound reproducing device that allows a user to sufficiently hear a loud sound. SOLUTION: An amplifying means 110 for amplifying an audio signal which is a source of a loud sound, an amplification updating means 125 for updating an amplification degree for the audio signal, and a noise component from a collected sound signal including the noise component. Noise component extraction means 121 to be extracted
A noise fluctuation amount calculating means 122 for calculating a noise fluctuation amount for each predetermined time for the noise, and an amplification degree fluctuation amount adjusting means 124 for adjusting the amplification degree fluctuation amount of the audio signal based on the noise fluctuation amount. It was configured to provide.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sound reproducing device, a sound reproducing program and a sound reproducing method for correcting a sound signal from a sound source so as to reproduce sound equivalent to the original sound, and more particularly to a sound condition. The present invention relates to a sound reproducing device, a sound reproducing program, and a sound reproducing method for correcting a sound signal from a sound source accordingly.

[0002]

2. Description of the Related Art A conventional sound reproducing apparatus has a predetermined time constant, and when the noise level changes, the amplification degree with respect to the sound signal (hereinafter referred to as the source signal) which is the source of the loud sound,
It has been designed to vary in a stepwise manner with a predetermined variation amount according to the noise level.

An example of such a conventional sound reproducing device is shown in FIG.
Shown in 1. In FIG. 11, a conventional sound reproducing device 110
0 indicates that the source signal input terminal 1101 receives the source signal from the sound source 1151, the amplifying means 1110 amplifies the source signal to generate a loud sound signal, and the loud sound signal output terminal 1
The speaker 102 outputs a loud sound signal to the speaker 1152.
Further, the sound pickup signal input terminal 1103 receives the sound pickup signal containing the 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 means 1125 changes the amplification degree with respect to the source signal stepwise by a predetermined variation amount according to the noise level.

A conventional sound reproducing device 110 shown in FIG.
At 0, for example, when the noise level is 60 dB, the amplification level 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.
Therefore, the amplification factor for the source signal is changed stepwise by a predetermined constant variation amount. Further, when the noise level further rises from 60 dB to 65 dB, the amplification level updating means 1125 causes the amplification level to be 70 dB, which is 5 dB higher than the noise level, so that the amplification level is a predetermined variation amount. Vary in stages. Specifically, from 65 dB to 65.5 dB, 66 dB, 66.
5 dB, 67 dB, 67.5 dB, 68 dB, 68.5
For example, dB, 69 dB, 69.5 dB, and 70 dB, the amplification level is changed stepwise by a predetermined constant variation amount such that the sound pressure level of the loud sound increases stepwise by 0.5 dB, and the It is designed to avoid fluctuations in the loud sound.

[0005]

However, such a conventional sound reproducing apparatus has a problem in that, when the noise level sharply rises and the minimum audible value sharply increases in an environment such as a stadium, the sound audible loudspeaker can be used in advance. There is a problem that the sound pressure level of the loud sound is not raised in time because it is varied with a predetermined fixed variation amount, and the user cannot fully hear the loud sound. Also, in such an environment, when the sound pressure level of the loud sound is increased stepwise, when the once raised noise level sharply decreases and the minimum audible value sharply decreases, the loud sound becomes loud. There is a problem that the user feels uncomfortable because of the protrusion.

The present invention has been made in order to solve such a problem, and even if the noise fluctuates gently or the noise fluctuates rapidly, the user can (EN) Provided are a sound reproducing device, a sound reproducing program, and a sound reproducing method which allow a user to fully hear a loud sound without giving a feeling of strangeness.

[0007]

The sound reproducing device of the present invention is a sound reproducing device for outputting a loud sound, and an amplifying means for amplifying an acoustic signal which is a source of the loud sound, and an amplifying device for the acoustic signal. Degree updating means for updating the degree, a noise component extracting means for extracting the noise component from the sound pickup signal including the noise component, and a noise variation amount calculating means for calculating the noise variation amount for the noise at predetermined time intervals. And an amplification degree variation amount adjusting means for adjusting the amplification variation amount of the acoustic signal based on the noise variation amount.

With this configuration, even if the noise fluctuates gently or the noise fluctuates abruptly, the user does not feel uncomfortable and the user speaks loudly. I can hear the sound enough.

In the sound reproducing device of the present invention, the amplification degree variation amount adjusting means has a configuration for adjusting the amplification variation amount based on the amplification variation amount and the noise variation amount.

With this configuration, even if the noise fluctuates gently or suddenly, the sound pressure level of the loud sound changes abruptly. Without giving the user
It is possible to make the user fully hear the loud sound.

The sound reproducing apparatus of the present invention comprises storage means for storing in advance a plurality of candidates for the amplification degree variation amount,
The amplification degree variation amount adjusting means is configured to select the amplification variation amount from the plurality of candidates stored in advance.

With this configuration, the amplification degree can be updated with a previously stored amount of amplification variation, so that the user does not feel uncomfortable such that the sound pressure level of the loud sound changes abruptly. can do.

In the sound reproducing device of the present invention, the noise component extraction means extracts the noise component for each frequency band, and the noise fluctuation amount calculation means calculates the noise fluctuation amount for each frequency band, The amplification degree variation amount adjusting means has a configuration for adjusting the amplification degree variation amount for each frequency band.

With this configuration, it is possible to allow the user to fully hear the loud sound while suppressing unnecessary fluctuations in the loud sound.

The sound reproduction program of the present invention comprises a noise component extraction step of extracting the noise component from a sound pickup signal containing the noise component, and a noise variation amount calculation for calculating the noise variation amount of the noise at predetermined time intervals. The computer is configured to execute the step and an amplification degree variation amount adjusting step of adjusting the amplification degree variation amount of the acoustic signal based on the noise variation amount.

With this configuration, even if the noise fluctuates gently or the noise fluctuates abruptly, the user does not feel uncomfortable and the user speaks loudly. I can hear the sound enough.

The sound reproduction program of the present invention comprises a noise component extraction step of extracting the noise component from a sound pickup signal containing the noise component, and a noise variation amount calculation for calculating the noise variation amount of the noise at predetermined time intervals. The computer is configured to execute a step and an amplification degree variation amount adjusting step for adjusting the amplification variation amount based on the amplification variation amount of the acoustic signal and the noise variation amount.

With this configuration, even if the noise fluctuates gently or suddenly, the sound pressure level of the loud sound changes abruptly. Without giving the user
It is possible to make the user fully hear the loud sound.

The sound reproduction program of the present invention has a configuration for selecting the amplification degree variation amount from a plurality of candidates stored in advance in the amplification degree variation amount adjusting step.

With this configuration, it is possible to update the amplification degree with a previously stored amount of variation in the amplification degree, so as not to give the user a feeling of strangeness such as a sudden change in the sound pressure level of the loud sound. can do.

In the sound reproduction program of the present invention, in the noise component extraction step, the noise component is extracted for each frequency band, and in the noise fluctuation amount calculation step,
The noise variation amount is calculated for each frequency band, and the amplification factor variation amount adjustment step adjusts the amplification factor variation amount for each frequency band.

With this configuration, it is possible to allow the user to fully hear the loud sound while suppressing unnecessary fluctuations in the loud sound.

In the sound reproduction method of the present invention, a noise component extraction step of extracting the noise component from the sound collection signal containing the noise component, and a noise variation amount calculation of calculating the noise variation amount of the noise at predetermined time intervals. The configuration includes a step and an amplification degree variation amount adjusting step of adjusting the amplification degree variation amount of the acoustic signal based on the noise variation amount.

With this configuration, even when the noise fluctuates gently or the noise fluctuates abruptly, the user does not feel uncomfortable and the user is audible. I can hear the sound enough.

The sound reproduction method of the present invention comprises a noise component extraction step of extracting the noise component from the sound pickup signal containing the noise component, and a noise variation amount calculation of calculating the noise variation amount of the noise at predetermined time intervals. The configuration includes a step, and an amplification degree variation amount adjusting step of adjusting the amplification degree variation amount based on the amplification amount variation amount of the acoustic signal and the noise variation amount.

According to this structure, even if the noise fluctuates gently or suddenly, the sound pressure level of the loud sound changes abruptly. Without giving the user
It is possible to make the user fully hear the loud sound.

The sound reproducing method of the present invention has a structure in which, in the amplification degree variation amount adjusting step, the amplification variation amount is selected from a plurality of candidates stored in advance.

With this configuration, it is possible to update the amplification degree with a previously stored amount of variation in the amplification degree, so as not to give the user a feeling of strangeness such as a sudden change in the sound pressure level of the loud sound. can do.

In the sound reproduction method of the present invention, in the noise component extraction step, the noise component is extracted for each frequency band, and in the noise fluctuation amount calculation step, the noise fluctuation amount is calculated for each frequency band, In the amplification degree variation amount adjusting step, the amplification degree variation amount is adjusted for each frequency band.

With this configuration, it is possible to allow the user to fully hear the loud sound while suppressing unnecessary fluctuations in 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.

(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, the sound reproduction device 100 includes a sound source 15
1. A source signal input terminal 101 for receiving an acoustic signal (hereinafter, referred to as a source signal) which is a source of a loud sound from 1 and an amplifying means 110 for amplifying the source signal and outputting it as a loud sound signal
And a loud sound signal output terminal 102 for outputting a loud sound signal to the speaker 152, a sound collecting signal input terminal 103 for receiving a sound collecting signal including a noise component from the microphone 153, and executing each step of sound reproduction processing described later. And a storage unit 130 for storing a program for causing the microcomputer 120 to execute each step of the sound reproduction process and information about the sound reproduction process.
The amplification means 110 has the same amplification degree as the sound quality controller 111 capable of amplifying the source signal with different amplification degree for each frequency band in each frequency band of the audible range, regardless of the frequency band in each frequency band of the audible range. And a volume controller 112 that amplifies the source signal. Further, the microcomputer 120 includes a noise component extracting means 121,
Noise fluctuation amount calculation means 122 and amplification degree fluctuation amount adjusting means 1
24 and amplification degree updating means 125.

The noise component extracting means 121 samples the collected sound signal at predetermined time intervals and extracts a noise component from the collected sound signal for each frequency band. The sound pickup signal received from the microphone 153 includes a loud sound component and a noise component, and generally, the loud sound component and the noise component have different frequencies.
The component of the loud sound picked up by the microphone 153 is one in which the source signal is amplified by the amplifying means 110, is loud as the loud sound from the speaker 152, and is attenuated while being transmitted to the microphone 153, and its characteristics are changed. is there.
When extracting a noise component from such a sound collection signal, the noise component extraction means 121 specifically divides the sound collection signal into frequency bands in the audible range, and at the same time, the sound source 151.
The level of the source signal from the speaker 1, the amplification degree with respect to the source signal, and the sound output from the speaker 152
A noise level indicating the magnitude of noise is calculated for each frequency band based on the transfer function indicating the transfer relationship of the loud sound until it is transmitted to 53 and the level of the sound pickup signal from the microphone 153.

The noise fluctuation amount calculation means 122 compares the noise levels for each frequency band calculated by the noise component extraction means 121 at predetermined time intervals, and calculates the noise fluctuation amount for each frequency band. Further, the noise fluctuation amount calculation means 122 classifies the noise fluctuation amount into a rising noise level and a falling noise level. The classified noise fluctuation amounts are stored in the storage unit 130 in time series.

The amplification degree variation amount adjusting means 124 adjusts the amplification degree variation amount for each frequency band based on the noise variation amount for each frequency band. For example, with respect to the noise fluctuation amount stored in the storage unit 130, statistical processing such as calculation of the average value of the noise fluctuation amount in the past several times is performed, and the amplification factor fluctuation amount is proportional to the calculated average value of the noise fluctuation amount. Adjust the amount of amplification fluctuation. When the noise level rises, the average value of the noise fluctuation amount when the noise level rises is used, and when the noise level decreases, the average value of the noise fluctuation amount when the noise level falls is used.

The amplification degree updating means 125 updates the amplification degree for the source signal for each frequency band with the amplification degree variation amount adjusted by the amplification degree variation amount adjusting means 124 for each frequency band. Specifically, the reference amplification degree is set in the volume controller 112 in all the audible frequency bands, and the difference between the amplification degree of each frequency band and the reference amplification degree is set in the sound quality controller in each audible frequency band. Set to 111.

If there is substantially no noise fluctuation,
Since the amplification degree variation amount adjusting means 124 does not adjust the amplification degree variation amount, the amplification degree updating means 125 updates the amplification degree with a predetermined amplification degree variation amount. Specifically, the amplification degree fluctuation amount adjusting means 124 compares the width of the noise fluctuation amount with a predetermined threshold value, and when the width of the noise fluctuation amount is within the predetermined threshold value, it is determined that there is substantially no noise fluctuation. By making a judgment and not adjusting the amount of change in the amplification degree, the loud sound can be prevented from flickering. Further, the amplification degree fluctuation amount adjusting means 124 determines whether or not the noise fluctuation amount continuously rises a predetermined number of times or more (or whether it continuously drops a predetermined number of times or more), and the predetermined number of times or more. If it is not a continuous rise (or a decline more than a predetermined number of times), it is determined that there is substantially no noise fluctuation, and the amount of amplification fluctuation is not adjusted to prevent the loud sound from flickering. Further, the amplification degree variation amount adjusting means 124 restricts the amplification variation amount so as not to exceed a predetermined upper limit value and limits the amplification variation amount so as not to fall below a predetermined lower limit value. Does not change rapidly.

FIG. 2 shows the noise level 202 calculated by the noise component extraction means 121 and the noise fluctuation amount calculation means 12.
2 shows examples of the noise fluctuation amount 206 calculated by No. 2 respectively. Note that the noise fluctuation amount 206 in FIG. 2 shows the slope of the noise level at time T1 as an example, and specifically, it is obtained by calculating the difference in noise level between time T0 and time T1. Is. 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. In addition, the noise fluctuation amount is classified into a rising noise level and a falling noise level and is registered in the table as shown in FIG. In addition,
Although FIGS. 2 and 3 show from the time T0 to the time T8, it goes without saying that the storage means 130 also stores the data after the time T8.

FIG. 4 shows a first sound reproducing device according to the present invention.
4 is a flowchart showing a sound reproduction process in the embodiment of 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 unit 130 of FIG. The sound reproduction process shown in FIG. 4 is started by the microcomputer 120 at predetermined time intervals.

In FIG. 4, first, a noise component is extracted from the sound pickup signal for each frequency band. (402). Specifically, the sound pickup signal is divided into frequency bands in the audible range, and the level of the source signal from the sound source 151, the amplification degree with respect to the source signal, and the loud sound from the speaker 152 are transmitted to the microphone 153. Based on the transfer function indicating the transmission relationship of the loud sound and the level of the sound pickup signal from the microphone 153, the noise level indicating the noise level is calculated for each frequency band.

Next, the noise level for each frequency band is compared with the past noise level, and the noise fluctuation amount is calculated for each frequency band (404). Further, the calculated noise fluctuation amount is classified into a noise level rising time and a noise level falling time, and is stored in the storage unit 130 in time series.

Next, based on the noise fluctuation amount for each frequency band, the amplification factor fluctuation amount is adjusted for each frequency band (40
6). For example, based on the noise fluctuation amount stored in the storage unit 130, statistical processing such as calculation of the average value of the noise fluctuation amounts in the past several times is performed, and amplification is performed so that the amplification fluctuation amount is proportional to the calculated average value. Adjust the amount of fluctuation. When the noise level rises, the average value of the noise fluctuation amount when the noise level rises is used, and when the noise level decreases, the average value of the noise fluctuation amount when the noise level falls is used.

Next, the amplification factor for the source signal is updated for each frequency band with the amplification factor fluctuation amount adjusted for each frequency band (408). Specifically, the reference amplification degree is set in the sound volume controller 112 in all frequency bands in the audible range, and the difference between the individual amplification degree and the reference amplification degree in each frequency band in the audible range is set in the sound quality controller 111. Set.

The human ear has different sensitivity depending on the frequency. Therefore, when adjusting the amount of amplification variation, preferably, based on the frequency of the noise and the information about the characteristics of the human ear, the amount of variation of the amplification when the frequency of the noise is in the low sensitivity range of the ear. , The noise frequency is set to be smaller than the fluctuation amount of the amplification degree when the sensitivity of the human ear is high. Further, the closer the noise frequency is 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 is from the frequency band of the loud sound, the easier it is to hear the loud sound. Therefore, when adjusting the amount of amplification variation, preferably, based on the difference between the frequency of the noise and the frequency of the loud sound, the closer the frequency of the noise and the frequency of the loud sound, the greater the variation of the amplification, The variation of the amplification degree is reduced as the frequency of the noise and the frequency of the loud sound are distant from each other.

As described above, in the present embodiment, the amplification degree variation amount is adjusted based on the noise variation amount. Therefore, even when the noise varies gently,
Even when the noise fluctuates rapidly, it is possible to make the user fully hear the loud sound without giving the user a feeling of strangeness. In addition, the noise fluctuation amount is classified into rising and falling noise levels and stored, and statistical fluctuations are used to analyze past fluctuation patterns of the noise level to adjust the amplification fluctuation amount. Moreover, it is possible to prevent the user from feeling uncomfortable.

Further, in the present embodiment, the noise component is extracted from the collected sound signal for each frequency band, the noise fluctuation amount is calculated for each frequency band, and the amplification factor fluctuation amount is adjusted for each frequency band. Therefore, it is possible to allow the user to fully hear the loud sound while suppressing unnecessary fluctuations in the loud sound. In addition, the amount of amplification variation is adjusted based on the noise frequency and information about the characteristics of the human ear, and the amount of amplification variation is adjusted based on the difference between the noise frequency and the frequency of the loud sound. Therefore, it is possible to make the sound pressure level of the loud sound closer to the noise level, if necessary, and to allow the user to hear the loud sound more sufficiently, while further suppressing unnecessary fluctuation of the loud sound.

(Second Embodiment) FIG. 5 is a block diagram showing a second embodiment of the sound reproducing apparatus according to the present invention. Note that in FIG. 5, the same constituents as those of the sound reproducing device 100 according to the first embodiment shown in FIG. 1 are denoted by the same reference numerals, and detailed description thereof will be omitted.

In FIG. 5, the sound reproducing apparatus 500 of the present embodiment differs 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 set at predetermined time intervals. An amplification degree variation amount calculation unit 523 for comparing and calculating the amplification degree variation amount for each frequency band is provided,
The noise fluctuation amount calculation unit 122 stores the noise fluctuation amount in time series for each frequency band in the storage unit 530, and the amplification degree fluctuation amount calculation unit 523 stores the amplification degree fluctuation amount in time series for each frequency band. The amplification degree variation amount adjusting unit 524, which is stored in the means 530, compares the amplification degree variation amount and the noise variation amount stored in the storage unit 530, and adjusts the amplification degree variation amount for each frequency band. ing.

The amplification degree variation amount adjusting means 524 is generally
If the noise fluctuation amount is larger than the amplification degree fluctuation amount, the amplification degree fluctuation amount is made larger than before, and if the noise fluctuation amount is smaller than the amplification degree fluctuation amount, the amplification degree fluctuation amount is made smaller than before. However, if the amount of change in amplification degree is made to follow the amount of change in noise too much, the loud sound is flickered and audible, which gives the user a feeling of strangeness. Therefore, the amplification variation adjusting means 52
4 is to analyze the noise fluctuation pattern by performing statistical processing such as calculation of the average value of the noise fluctuation amount in the past several times,
The amplification degree variation pattern is analyzed to adjust the amplification degree variation amount. Specifically, the amplification degree fluctuation amount adjusting means 524 compares the width of the noise fluctuation amount with a predetermined threshold value, and when the width of the noise fluctuation amount is within the predetermined threshold value, there is substantially no noise fluctuation. By making a judgment and not adjusting the amount of change in the amplification degree, the loud sound can be prevented from flickering. Further, the amplification degree fluctuation amount adjusting means 524 determines whether or not the noise fluctuation amount continuously rises a predetermined number of times or more (or whether it continuously drops a predetermined number of times or more), and the predetermined number of times or more. If it is not a continuous rise (or a decline more than a predetermined number of times), it is determined that there is substantially no noise fluctuation, and the amount of amplification fluctuation is not adjusted to prevent the loud sound from flickering. Further, the amplification degree variation amount adjusting means 52
In No. 4, the amplification amount fluctuation amount is restricted so as not to exceed a predetermined upper limit value, and the amplification amount fluctuation amount is restricted so as not to fall below a predetermined lower limit value, so that the loud sound does not suddenly change. . In addition, if the amplification level is being increased, even if the noise level decreases, the amplification level is not immediately decreased, but the slope of the amplification level is reduced once, and then the amplification level decreases. The amount of change in the amplification degree is adjusted so that

FIG. 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 fluctuation amount. An example of the amplification degree variation amount 608 calculated by the calculation unit 523 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 in noise level between time T0 and time T1. Is. Further, the amplification degree variation amount 608 in FIG. 6 shows the inclination of the amplification degree at time T2 as an example, and specifically, it is obtained by calculating the difference in amplification degree between time T1 and time T2. It is a thing. Figure 7
Shows a table in which the noise level, the amplification degree, the noise fluctuation amount, and the amplification fluctuation amount are registered in time series. This table is stored in the storage means 530 of FIG. Further, the noise fluctuation amount is classified into a rising noise level and a falling noise level and is registered in the table as shown in FIG. Further, as shown in FIG. 7, the amplification degree variation amount is classified into a rising noise level and a falling noise level and registered in the table. 6 and 7 show from time T0 to time T8, it goes without saying that time T8
The subsequent steps are similarly stored in the storage means 530.

FIG. 8 shows a second sound reproducing device according to the present invention.
4 is a flowchart showing a sound reproduction process in the embodiment of the present invention. Each step of the sound reproduction process shown in FIG. 8 is executed by the microcomputer 520 by a program stored in advance in the storage unit 530 of FIG. The sound reproduction process shown in FIG. 8 is started by the microcomputer 520 at predetermined time intervals.

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 past noise level, and the noise fluctuation amount is calculated for each frequency band (80
4). Next, the amplification degree for each frequency band is compared with the past amplification degree, and the amplification degree variation amount is calculated for each frequency band (80
5). Next, the amplification degree variation amount is adjusted for each frequency band based on the amplification degree variation amount for each frequency band and the noise variation amount for each frequency band (806). Next, the amplification degree for the source signal is updated for each frequency band with the amplification degree variation amount adjusted for each frequency band (808).

In addition, when adjusting the amount of change in the amplification degree, it is preferable to determine the amplification degree when the frequency of the noise is in the low ear sensitivity band based on the frequency of the noise and the information about the characteristics of the human ear. The fluctuation amount is set to be smaller than the fluctuation amount of the amplification degree when the frequency of noise is in a band where the sensitivity of the human ear is high. Further, when adjusting the amount of amplification variation, preferably, based on the difference between the frequency of the noise and the frequency of the loud sound, the variation of the amplification becomes larger as the frequency of the noise and the frequency of the loud sound are closer, The variation of the amplification degree is reduced as the frequency of the noise and the frequency of the loud sound are distant from each other.

As described above, in the present embodiment, since the amplification degree variation amount is adjusted based on the amplification degree variation amount and the noise variation amount, the case where the noise varies gently. Even if the noise fluctuates abruptly, it is possible to make the user fully hear the loud sound without making the user feel uncomfortable. In addition, the amount of amplification fluctuation and the amount of noise fluctuation are categorized into ascending and descending and are memorized, and the amount of amplification fluctuation is adjusted by analyzing the past variation patterns of amplification and noise levels. Therefore, it is possible to prevent the user from feeling uncomfortable as compared with the first embodiment.

Further, in the present embodiment, the noise component is extracted from the collected signal for each frequency band, the noise fluctuation amount is calculated for each frequency band, and the amplification factor fluctuation amount is adjusted for each frequency band. Therefore, it is possible to allow the user to fully hear the loud sound while suppressing unnecessary fluctuations in the loud sound. In addition, the amount of amplification variation is adjusted based on the noise frequency and information about the characteristics of the human ear, and the amount of amplification variation is adjusted based on the difference between the noise frequency and the frequency of the loud sound. Therefore, it is possible to make the sound pressure level of the loud sound closer to the noise level, if necessary, and to allow the user to hear the loud sound more sufficiently, while further suppressing unnecessary fluctuation of the loud sound.

(Third Embodiment) A sound reproducing apparatus according to a third embodiment will be described with reference to FIG. The sound reproducing device of the third embodiment differs from the sound reproducing device of the first embodiment in that the storage unit 130 stores in advance a plurality of candidates for the amplification amount variation amount, and the amplification amount variation amount adjusting unit 124. However, among the candidates stored in the storage unit 130, a candidate having a slope substantially close to the noise fluctuation amount is selected as the amplification factor fluctuation amount. Other components are the same as those in the first embodiment, and detailed description thereof will be omitted.

Specifically, the amplification degree fluctuation amount adjusting means 124 performs statistical processing such as calculation of an average value of the noise fluctuation amounts in the past several times, based on the noise fluctuation amount stored in the storage means 130, and calculates. The averaged value is compared with a plurality of candidates for the amplification amount variation amount stored in advance in the storage unit 130, and a candidate having a slope closest to the average value of the noise variation amount is selected from the candidates. When the noise level rises, the average value of the noise fluctuation amount when the noise level rises is used, and when the noise level decreases, the average value of the noise fluctuation amount when the noise level falls is used.

As described above, in this embodiment, since the amplification degree variation amount is selected from the candidates stored in the storage means 130 in advance, the amplification degree variation stored in the storage means 130 in advance has a proven record. The amplification degree can be updated by the amount, and it is possible to prevent the user from feeling uncomfortable such that the sound pressure level of the loud sound changes abruptly.
Other effects are the same as those described in the first embodiment, and detailed description thereof will be omitted.

(Fourth Embodiment) A sound reproducing apparatus according to a fourth embodiment will be described with reference to FIG. The sound reproducing device of the fourth embodiment differs from the sound reproducing device of the second embodiment in that the storage unit 530 stores in advance a plurality of candidates for the amplification amount variation amount, and the amplification amount variation amount adjusting unit 524. However, among the candidates stored in the storage unit 530, a candidate having a slope substantially close to the noise fluctuation amount is selected as the amplification factor fluctuation amount. The other constituent elements are the same as those in the second embodiment, and detailed description thereof will be omitted.

Specifically, the amplification degree variation amount adjusting means 524 performs statistical processing such as calculation of the average value of the noise variation amounts in the past several times based on the noise variation amount stored in the storage means 530, and calculates. The average value of the noise fluctuation amount and the amplification amount fluctuation amount are compared. As a result of the comparison, if the noise fluctuation amount is larger than the amplification amount fluctuation amount, a value larger than the current amplification amount fluctuation amount and closest to the current amplification amount fluctuation amount is selected from the candidates stored in the storage unit 530. The candidate is selected as the new amplification degree variation amount. Further, as a result of the comparison, if the noise fluctuation amount is smaller than the amplification amount fluctuation amount, it is smaller than the current amplification degree fluctuation amount from the candidates stored in the storage unit 530,
At the same time, a candidate whose numerical value is closest to the current amplification amount variation amount is selected as a new amplification amount variation amount. When the noise level rises, the average value of the noise fluctuation amount when the noise level rises is used, and when the noise level decreases, the average value of the noise fluctuation amount when the noise level falls is used.

As described above, in this embodiment, since the amplification degree variation amount is selected from the candidates stored in the storage means 530 in advance, the amplification degree variation which has been previously stored in the storage means 530 is selected. The amplification degree can be updated by the amount, and it is possible to prevent the user from feeling uncomfortable such that the sound pressure level of the loud sound changes abruptly.
Other effects are the same as the effects described in the second embodiment, and detailed description thereof will be omitted.

(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 constituents as those of the sound reproducing device 100 according to the first embodiment shown in FIG. 1 have the same reference numerals, and detailed description thereof will be omitted.

In FIG. 9, the sound reproducing apparatus 900 of the present embodiment has a first processor 910 having a sound quality controller 111, a volume controller 112, a noise component extracting means 121, and an amplification degree updating means 125, Noise fluctuation amount calculation means 12
2 and a second processor 920 having an amplification degree variation amount adjusting means 124 and a storage means 130.

As described above, according to the present embodiment, the first processor 910 is responsible for the basic functions of amplifying the source signal, updating the amplification degree, and extracting the noise component, the calculation of the noise fluctuation amount, and Since it is configured separately from the second processor 920, which has a function of adjusting the amount of change in the amplification degree, if the second processor 920 suitable for each individual noise environment is used, the The adapted sound reproduction can be easily realized. Other effects are the same as those described in the first embodiment, and detailed description thereof will be omitted.

(Sixth Embodiment) FIG. 10 is a block diagram showing a sixth embodiment of the sound reproducing apparatus according to the present invention. In FIG. 10, the same constituents as those of the sound reproducing device 500 according to the second embodiment shown in FIG. 5 have the same reference numerals, and detailed description thereof will be omitted.

Referring to FIG. 10, the sound reproducing apparatus 1000 of this embodiment has a sound quality controller 111 and a volume controller 112.
A first processor 1010 having a noise component extracting means 121 and an amplification degree updating means 125, a noise variation amount calculating means 122, an amplification degree variation amount calculating means 523, an amplification degree variation amount adjusting means 524, and a storage means 530. And a second processor 1020 having

As described above, according to the present embodiment, the first processor 1010 having the basic functions of amplifying the source signal, updating the amplification degree, and extracting the noise component,
Since the second processor 1020, which is responsible for the functions of calculating the noise fluctuation amount, calculating the amplification fluctuation amount, and adjusting the amplification fluctuation amount, is configured separately, the second processor 1020 has individual noise. If a suitable one for each environment is used, it is possible to easily realize sound reproduction adapted to an individual noise environment. Other effects are the same as the effects described in the second embodiment, and detailed description thereof will be omitted.

(Seventh Embodiment) The sound reproducing apparatus of the seventh embodiment differs from the sound reproducing apparatus of the fifth embodiment in that the storage means 130 stores a plurality of candidates for the amplification degree variation amount. The amplification degree variation amount adjusting means 124, which is stored in advance, selects the amplification degree variation amount from the candidates stored in the storage means 130. The other constituent elements are the same as those in the fifth embodiment, and detailed description thereof will be omitted.

As described above, in this embodiment, since the amplification degree variation amount is selected from the candidates stored in advance, the amplification degree should be updated with the previously stored achievement variation amount. Therefore, it is possible to prevent the user from feeling uncomfortable that the sound pressure level of the loud sound changes abruptly. Other effects are the same as those described in the fifth embodiment, and detailed description thereof will be omitted.

(Eighth Embodiment) Unlike the sound reproducing apparatus according to the sixth embodiment, the sound reproducing apparatus according to the eighth embodiment stores a plurality of candidates for the amplification amount fluctuation amount in the storage means 530. The amplification degree variation amount adjusting unit 524, which is stored in advance, selects the amplification degree variation amount from the candidates stored in the storage unit 530. Other components are the same as those in the sixth embodiment, and detailed description thereof will be omitted.

As described above, according to the present embodiment, since the amplification degree variation amount is selected from the pre-stored candidates, the amplification degree should be updated with the pre-stored proven amplification degree variation amount. Therefore, it is possible to prevent the user from feeling uncomfortable that the sound pressure level of the loud sound changes abruptly. Other effects are the same as those described in the sixth embodiment, and detailed description thereof will be omitted.

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 factor fluctuation amount is adjusted for each frequency band. Although the embodiment in which the configuration is not provided is shown, the present invention is not limited to this, and the amplification degree variation amount may be commonly adjusted in all frequency bands. In this way, when the amplification degree variation amount is commonly adjusted in all frequency bands, the configuration is simple as compared with the case where the amplification degree variation amount is adjusted for each frequency band, and the present invention is easily implemented. You can

Further, in the above description, an embodiment has been shown in which the average value of the noise fluctuation amount is calculated and the amplification factor fluctuation amount is adjusted based on the average value of the noise fluctuation amount. The noise level fluctuation pattern is analyzed using other statistical processing such as calculation of the maximum value of the noise fluctuation amount and calculation of the minimum value of the noise fluctuation amount, and the amplification degree is based on the result of this analysis. The amount of fluctuation may be adjusted.

Further, in the above description, a mode is shown in which one speaker and one microphone are connected to the sound reproducing device, but the present invention is not limited to this, and the sound reproducing device is provided with a plurality of speakers and a plurality of microphones. connection,
The source signal may be amplified with a different amplification degree variation amount depending on the loudspeaking place or the loudspeaking direction of each speaker.

Further, in the above description, the mode in which the microcomputer executes each step of the sound reproduction processing is shown, but the present invention is not limited to this, and each step of the sound reproduction processing is performed by a device other than the microcomputer. May be executed.

[0076]

As described above, according to the present invention, even when the noise fluctuates gently or the noise fluctuates rapidly, the user does not feel uncomfortable and the user does not feel uncomfortable. (EN) Provided are a sound reproducing device, a sound reproducing program, and a sound reproducing method capable of sufficiently listening to a loud sound.

[Brief description of drawings]

FIG. 1 is a block diagram showing a sound reproducing device according to first and third embodiments of the invention.

FIG. 2 is an explanatory diagram showing an example of a noise level and a noise fluctuation amount in the sound reproducing devices of the first and third embodiments according to the present invention.

FIG. 3 is an explanatory diagram showing an example of a table in which noise levels and noise fluctuation amounts are registered in the sound reproducing devices of the first and third embodiments according to the present invention.

FIG. 4 is a flowchart showing a sound reproduction process of the sound reproduction devices of the first and third embodiments according to the present invention.

FIG. 5 is a block diagram showing a sound reproducing device according to second and fourth embodiments of the invention.

FIG. 6 is an explanatory diagram showing an example of a noise level, an amplification degree, a noise variation amount, and an amplification degree variation amount in the sound reproducing devices of the second and fourth embodiments according to the present invention.

FIG. 7 is an explanatory diagram showing an example of a table in which the noise level, the amplification degree, the noise fluctuation amount, and the amplification degree fluctuation amount are registered in the sound reproducing devices of the second and fourth embodiments according to the present invention.

FIG. 8 is a flowchart showing a sound reproduction process of the sound reproduction device of the second and fourth embodiments according to the present invention.

FIG. 9 is a block diagram showing a sound reproducing device according to fifth and seventh embodiments of the present invention.

FIG. 10 is a block diagram showing a sound reproducing device according to sixth and eighth embodiments of the present invention.

FIG. 11 is a block diagram showing a conventional sound reproducing device.

[Explanation of symbols]

101 Source signal input terminal 102 Loudspeaker signal output terminal 103 Sound pickup signal input terminal 110 amplification means 111 Sound quality controller 112 Volume Controller 121 Noise component extraction means 122 Noise Fluctuation Calculation Unit 523 Amplitude Fluctuation Amount Calculation Means 124, 524 Amplitude fluctuation amount adjusting means 125 Amplification degree updating means 130, 530 storage means 151 sound source 152 speakers 153 microphone

Claims (12)

[Claims] 1. A sound reproducing device for outputting a loud sound, comprising: an amplifying means for amplifying an acoustic signal which is a source of the loud sound; an amplifying degree updating means for updating an amplifying degree with respect to the acoustic signal; Noise component extraction means for extracting a component of the noise from a sound collection signal including a component, and noise variation amount calculation means for calculating a noise variation amount for the noise at predetermined time intervals,
An audio reproduction apparatus comprising: an amplification degree variation amount adjusting means for adjusting the amplification degree variation amount of the audio signal based on the noise variation amount. 2. The sound reproducing apparatus according to claim 1, wherein the amplification degree variation amount adjusting means adjusts the amplification variation amount based on the amplification variation amount and the noise variation amount. . 3. A storage unit that stores a plurality of candidates for the amplification amount variation amount in advance, and the amplification amount variation amount adjusting unit selects the amplification amount variation amount from the plurality of pre-stored candidates. The sound reproducing device according to claim 1 or 2, characterized in that. 4. The noise component extraction means extracts the noise component for each frequency band, and the noise fluctuation amount calculation means calculates the noise fluctuation amount for each frequency band, and the amplification degree fluctuation amount is adjusted. 4. The sound reproducing device according to claim 1, wherein the means adjusts the amplification degree variation amount for each frequency band. 5. A noise component extracting step of extracting the noise component from a sound collection signal including a noise component, a noise fluctuation amount calculating step of calculating a noise fluctuation amount of the noise at predetermined time intervals, and the noise fluctuation. A sound reproduction program, which causes a computer to execute an amplification degree variation amount adjusting step of adjusting an amplification degree variation amount of an audio signal based on the amount. 6. A noise component extraction step of extracting the noise component from a sound collection signal including a noise component, a noise variation amount calculation step of calculating a noise variation amount for the noise at predetermined time intervals, and A sound reproduction program, which causes a computer to execute an amplification degree variation amount adjusting step of adjusting the amplification degree variation amount based on the amplification degree variation amount and the noise variation amount. 7. The sound reproducing program according to claim 5, wherein in the amplification degree variation amount adjusting step, the amplification variation amount is selected from a plurality of candidates stored in advance. 8. 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 to adjust the amplification degree fluctuation amount. The sound reproduction program according to any one of claims 5 to 7, wherein in the step, the amount of change in amplification is adjusted for each frequency band. 9. A noise component extraction step of extracting the noise component from a sound collection signal including a noise component, a noise fluctuation amount calculation step of calculating a noise fluctuation amount for the noise at predetermined time intervals, and the noise fluctuation. And a step of adjusting an amplification degree variation amount for adjusting an amplification degree variation amount of an audio signal based on the amount. 10. A noise component extraction step of extracting the noise component from a sound collection signal including a noise component, a noise variation amount calculation step of calculating a noise variation amount of the noise at predetermined time intervals, and A sound reproduction method, comprising: an amplification degree variation amount adjusting step of adjusting the amplification degree variation amount based on the amplification degree variation amount and the noise variation amount. 11. The sound reproducing method according to claim 9, wherein in the amplification degree variation amount adjusting step, the amplification variation amount is selected from a plurality of candidates stored in advance. 12. The noise component extracting step,
Extracting the noise component for each frequency band, in the noise fluctuation amount calculating step, calculates the noise fluctuation amount for each frequency band, in the amplification degree fluctuation amount adjusting step,
12. The sound reproducing method according to claim 9, wherein the amplification degree variation amount is adjusted for each frequency band.