WO2008015733A1

WO2008015733A1 - Sound control device, sound control method, and sound control program

Info

Publication number: WO2008015733A1
Application number: PCT/JP2006/315166
Authority: WO
Inventors: Junichi Yoshio
Original assignee: Pioneer Corporation
Priority date: 2006-07-31
Filing date: 2006-07-31
Publication date: 2008-02-07

Abstract

Provided is a sound control device capable of reproducing acoustic data by a user of a content with a preferable acoustic characteristic even if the reproduction environment of the user is not the one intended by a content producer. The sound control device includes: a first processing unit (1) which acquires content data (D) including audio data (AD) on a plurality of channels and loudness data (LD) indicating the sound loudness of each of the channels; second processing units (3A to 3E) which perform a normalize process for commonly controlling sound loudness of each of the channels by using each sound loudness data (LD), an emphasis/de-emphasis process for controlling a sound loudness corresponding to some of the channels by using a loudness data (LD) corresponding to the some of the channels, and a multi-channel balance process for further controlling loudness of each of the controlled sounds according to a listening environment including installation positions of respective speakers (5A to 5E).

Description

Specification

SOUND CONTROL DEVICE, SOUND CONTROL METHOD, AND SOUND CONTROL PROGRAM

Technical field

[0001] The present application belongs to the technical field of a sound control device, a sound control method, and a sound control program, and more specifically, a sound control device, a sound control method, and a sound control method for controlling sound emission states of a plurality of channels. It belongs to the technical field of sound control programs.

Background art

[0002] In recent years, for example, producers produce content including moving images and sound such as movies, and the contents are recorded on an optical disc or sold, or distributed to users via a network such as the Internet. Widely common.

[0003] Then, the above producer creates an acoustic effect ^ iij that maximizes the value of the content, and sets the volume level etc. so that the created acoustic effect can be obtained. After that, the voice or the like is recorded or distributed as acoustic data.

[0004] Here, regarding the acoustic characteristics in the space where the content is reproduced (for example, ambient noise-noise conditions, the size of the space itself, or the sound absorption characteristics of the walls constituting the space) The acoustic characteristics assumed by the content producer at the time of production are usually different from the acoustic characteristics in the space where the content is actually played by the viewer. Furthermore, it is practically difficult for the producer to grasp the degree of the difference in all cases.

[0005] Therefore, in such a case, as exemplified in Patent Document 1 or 2 below, for example, the producer models a plurality of types of playback environments, etc. for the playback player, and the playback environment, etc., that models the playback environment. In each of the above, volume level control information (so-called loudness control information) to obtain the intended acoustic effect is added to the acoustic data, and recorded or distributed. It is said.

[0006] More specifically, for example, the control information for low volume playback that should be used when the entire content is played back at a volume lower than the volume intended by the creator, the player with hearing loss views the content. Control information and content to be used for hearing The control information for specific sound that should be used when playing only the volume level of specific sound (for example, announcement sound) within the volume level of other sound is recorded together with the above sound data in advance. Or distribute. Then, a player who reproduces acoustic data to which a plurality of types of the control information is added selects V or the optimum control information depending on the acoustic characteristics in the reproduction environment where the acoustic data is reproduced. To start playback. As a result, the amplification factor and the like of the amplifier used by the player is automatically controlled based on the content of the control information, and thereby the sound data specified by the content of the control information can be reproduced. It is.

Patent Document 1: Japanese Patent Laid-Open No. 2006-42027

Patent Document 2: Special Table 2003-524906

Disclosure of the invention

Problems to be solved by the invention

[0007] However, the actual acoustic characteristics in the playback environment of the player are quite different, and the producer intends the actual acoustic characteristics by the method using the above model. There is a limit to approaching the acoustic characteristics.

[0008] In addition, many of the above-mentioned contents in recent years have dramatically improved in their precision, and it is desired to manipulate (control) the acoustic characteristics during playback more precisely. However, with the conventional method described above, it is physically difficult to finely adjust the volume level and the like, for example, in a time-division and frequency-division manner, and it becomes impossible to follow the precision of recent contents. is there.

[0009] Therefore, the present application has been made in view of the above problems, and one example of the problem is that even if the playback environment of the content player is not intended by the content producer, An object of the present invention is to provide a sound control device, a sound control method, and a sound control program capable of reproducing sound data by the player with good acoustic characteristics.

Means for solving the problem

[0010] In order to solve the above-described problem, the invention according to claim 1 corresponds to sound information including a plurality of channels of channel sound information corresponding to one channel, and each of the channel sound information. Channel loudness for each channel indicating the loudness itself Information is acquired from the outside, using the acquisition means such as the first processing unit, and each channel sound volume information, the sound volume corresponding to each channel sound information is common to all the channels Using the first control means such as the second processing unit to be controlled automatically and the channel sound volume information corresponding to the part of the channel, the part of the channel. Second control means such as a second processing unit for controlling the volume of the pre-record sound corresponding to the channel sound information corresponding to the channel sound information, each channel sound volume information corresponding to the corresponding channel sound information It is configured to be the channel sound volume information for changing the volume of the sound to be played based on a preset audibility correction characteristic of the person.

In order to solve the above-described problem, the invention according to claim 3 corresponds to sound information including a plurality of channels of channel sound information corresponding to one channel, and each of the channel sound information. The channel sound information for each channel indicating the sound volume itself is obtained by using an acquisition means such as a first processing unit that obtains the sound from the outside, and the channel sound information. The first control means such as a second processing unit that controls the volume of the sound corresponding to all the channels in common, and a part of the channels correspond to the part of the channels. Second control means such as a second processing unit for controlling the volume of the pre-record sound corresponding to the channel sound information corresponding to the part of the channels using the channel sound volume information; Each And third control means such as a second processing unit for further controlling the loudness based on the listening environment for listening to each sound.

[0012] In order to solve the above problem, the invention according to claim 7 corresponds to sound information including a plurality of channels of channel sound information corresponding to one channel, and each of the channel sound information. Channel sound volume information for each of the channels indicating the volume of the sound itself, an acquisition step of acquiring external force, and using each of the channel sound volume information, the sound corresponding to each of the channel sound information The first control step for controlling the volume in common for all the channels, and for the some of the channels, using the channel sound magnitude information corresponding to the some of the channels, A second control for controlling the volume of the sound corresponding to the channel sound information corresponding to the channel of Each channel sound volume information includes a channel, and the channel sound volume information corresponding to the channel sound information corresponding to the channel sound information is changed based on a preset human auditory correction characteristic. It is configured to be sound volume information.

[0013] In order to solve the above-described problem, the invention according to claim 8 provides a computer,

It functions as the sound control device according to any one of 1 to 6.

Brief Description of Drawings

FIG. 1 is a block diagram showing a schematic configuration of a playback system according to an embodiment.

FIG. 2 is a diagram illustrating the content of loudness data according to the embodiment.

FIG. 3 is a block diagram showing a schematic configuration of a playback apparatus according to the embodiment.

FIG. 4 is a flowchart showing processing in the playback apparatus according to the embodiment.

Explanation of symbols

[0015] 1 First processing unit

2 Control unit

3A, 3B, 3C, 3D, 3E Second processing part

4A, 4B, 4C, 4D, 4E amplifiers

5A, 5B, 5C, 5D, 5E speakers

S playback system

P Playback device

B Broadcasting station

D Content data

DD unit content data

C control data

AD audio data

LD Loud 's, Sdatar

BEST MODE FOR CARRYING OUT THE INVENTION

Next, the best mode for carrying out the present application will be described with reference to the drawings. In the embodiment described below, content data, which is content of a broadcasting station such as a movie, is distributed to a playback device via a network such as the Internet or broadcast radio waves. In the embodiment, the present application is applied to a playback system that plays back the content data in the playback device (that is, watches the movie or the like corresponding to the content data).

(I) Overall configuration and configuration of loudness data

First, the overall configuration of the playback system according to the embodiment and the configuration of the loudness data according to the embodiment will be described with reference to FIGS. 1 and 2. FIG. 1 is a block diagram showing a schematic configuration of the playback system according to the embodiment, and FIG. 2 is a diagram illustrating the contents of loudness data according to the embodiment.

As shown in FIG. 1, the playback system S according to the embodiment includes a broadcasting station B and a playback device P to which a display unit (not shown) and a speaker 5 are connected, such as a liquid crystal display. The content data D created and digitized at the broadcasting station B is

Then, it is transmitted to the playback device P via the network or broadcast radio wave.

[0018] Next, the configuration of the content data D will be specifically described with reference to FIG.

As shown in FIG. 1, content data D includes image data and sound data corresponding to the content itself such as the movie. Then, based on the amount of information or the content of the content, etc., the broadcast station is divided into a plurality of unit content data DD in advance.

B force is transmitted to the regenerator P.

Here, the acoustic data in one unit content data DD includes, for example, a header H, control data C, and audio data AD that is an entity as acoustic data, as illustrated in FIG. It is configured.

[0021] At this time, in the header H, for example, information indicating image data to be reproduced simultaneously corresponding to the audio data AD included in the same unit content data DD, and the content of the audio data AD It includes time information indicating the playback timing measured from the start of playback.

[0022] Further, the control data C includes information indicating attributes such as the number of channels of the audio data AD included in the same unit content data DD, in addition to the loudness data LD described in detail later. .

Next, the loudness data LD included in the control data C and according to the embodiment is included in the control data C. This will be described with reference to FIG.

[0024] The loudness data LD according to the embodiment is a time division unit in which audio data AD included in the same unit content data DD is set in advance. Time division unit that is set in consideration of, etc., for example, 10 milliseconds is preferable), and when the frequency is further divided for each temporary division unit obtained by the time division This is data indicating the volume level itself for each frequency division unit (frequency division unit that divides each frequency (decade) in the frequency of audio data AD, for example, not frequency division unit having absolute value as frequency). is there.

[0025] More specifically, the loudness data LD is included in the same unit content data DD, and for each channel of the audio data AD, the volume level in the temporary division unit in the audio data AD (that is, A value obtained by averaging changes in the time direction of (amplitude) by a method that is standardized in advance or arbitrarily set in advance is a level value as loudness data LD in the temporary division unit. Then, this averaging process is performed for each frequency division unit set in advance and for all the frequency bands as the audio data AD, and the control data C includes the loudness data LD corresponding to the frequency division unit. Included.

In addition to the above basic configuration, in this embodiment, the level value obtained by the above-described averaging process is used as the loudness data LD actually transmitted to the playback device P, for example, as shown in FIG. As shown in Fig. 5, weighting is performed using a preset correction characteristic indicating human auditory correction. As a result, the loudness data LD corrected according to the human audibility for each frequency division unit can be transmitted together with the corresponding audio data AD.

[0027] Here, FIG. 2 will be described additionally.

[0028] Figure 2 is commonly referred to as the so-called NR (Noise Rating) curve and ISO (International

Organization for Standardization), etc., and numbers (NR0, NR10, NR20,..., NR130) are assigned according to usage. Each NR curve shows the sound pressure of the audio data AD, which seems to be optimal when sound is emitted as an application corresponding to that number, as a function of frequency. At this time, For example, as illustrated in FIG. 2, the correction characteristic indicated by the number NR30 seems to be applied when sound equivalent to the audio data AD is emitted in an environment such as a private house or hospital. Similarly, the correction characteristic indicated by the number NR40 indicates the sound equivalent to the audio data AD in an environment such as a large building, hall, hallway, etc. This shows the sound pressure correction characteristics for each frequency that should be applied when sound is emitted. Next, the configuration and operation of the playback apparatus P according to the embodiment will be specifically described with reference to FIGS. FIG. 3 is a block diagram showing a schematic configuration of the playback device P according to the embodiment, and FIG. 4 is a flowchart showing processing in the playback device P according to the embodiment. The playback device P described below is a playback device P that constitutes a so-called 5.1 channel surround system.

[0029] As shown in FIG. 3, the playback device P to which the content data D including the loudness data LD is transmitted from the broadcasting station B is a first processing unit as an acquisition means to which the content data D is input. 1, a control unit 2 as a first control unit, a second control unit and a third control unit, second processing units 3A to 3E as a first control unit, a second control unit and a third control unit, and an amplifier 4A to 4E and speakers 5A to 5E constituting the speaker 5 shown in FIG.

[0030] Here, the second processing units 3A to 3E, the amplifiers 4A to 4E, and the speakers 5A to 5E are each set to emit sound corresponding to one channel. More specifically, for example, the second processing unit 3A, the amplifier 4A, and the speaker 5A emit sound for the subwoofer in the surround system, and the second processing unit 3B, the amplifier 4B, and the speaker 5B The sound for the front left in the surround system is emitted, and the sound for the right front in the surround system is emitted by the second processing unit 3C, the amplifier 4C, and the speaker 5C, and the second processing unit 3D. The sound for the surround left in the surround system is emitted with the amplifier 4D and the force 5D, and the sound for the surround right in the surround system is emitted with the second processing unit 3E, the amplifier 4E and the speaker 5E. To do. [0031] In the above configuration, the first processing unit 1 receives an input signal based on the control signal S from the control unit 1.

C1

The audio data AD in the received content data D is separated for each channel, and so-called preprocessing such as preset amplification processing (i.e., common preprocessing for audio data AD of all channels). ) And output to each of the corresponding second processing units 3A to 3E as processing signals S to S for each channel.

A E

In parallel with this, the first processing unit 1 separates the loudness data LD from the content data D for each channel and outputs it to the control unit 2 as a loudness data signal S.

LD

[0033] Next, each of the second processing units 3A to 3E is based on the control signals S to S from the control unit 1.

CA CE

Each of the processing signals S to S of each channel has a label corresponding to that channel.

A E

Performs volume level correction processing using the loudness data LD (specifically, correction processing according to the correction characteristics indicated by the loudness data LD for each frequency division unit and time division unit) for each amplifier 4A to 4E. A control signal S for generating the signal is generated. At this time

C

The loudness data LD corresponding to each channel is one of the control signals S to S.

CA CE

As supplied from the control unit 2.

[0034] Then, the audio data for each channel included in each of the processed signals S to S is displayed.

A E

For the data AD, the amplifiers 4A to 4A that correspond directly as the acoustic signals SA to SA

D E

4E, while the control signal S indicating the volume level as a result of the above correction process is

C

The amplifiers 4A to 4E are respectively output to the amplifiers 4A to 4E so as to control the amplification factors and the like.

[0035] Thereby, each of the amplifiers 4A to 4E is indicated by the control signal S inputted thereto.

C

Based on the correction characteristics, the amplification processing for the acoustic signals SA to SA

D E

This is executed for each division unit and each time division unit, and each speaker 5A to 5A is output as the output signal S.

OUT

Sound is emitted from E.

In parallel with these, the control unit 2 controls the first processing unit 1 and the second processing unit 3A based on the operation signal and the like input from the operation unit equal force (not shown) and the separated loudness data LD. To generate control signals S and S to S to control 3E

CI CA CE

And output to the corresponding component. [0037] Next, the control signals S 1 to S and the loudness data LD for each channel are included.

CA CE

Based on the control signal S generated in each of the second processing units 3A to 3E

C

The above correction processing will be specifically described with reference to FIG.

[0038] The correction processing executed using the control signal S from each of the second processing units 3A to 3E is c

Specifically, as shown in Fig. 4, so-called normalization processing (step S1), so-called emphasis processing Z de-emphasis processing (step S2) and! / So-called multi-channel balance processing (step S3) are performed. include. Here, each processing is executed independently for each channel. For example, the amplifier 4A is the execution target of all the normalization processing, emphasis processing, Z de-emphasis processing, and multi-channel balance processing. The control signal S output to the amplifier 4A is

C

The three processes have values as a result of superimposing them. Similarly, for example, when the amplifier 4C is an execution target of only the normalization process and the multi-channel balance process, the control signal S output to the amplifier 4C is used.

C

Has a value as a result of superimposing the two processes in a superimposed manner.

[0039] Then, after the above steps S1 to S3 are executed, it is further confirmed whether or not the force from the processing of steps S1 to S3 has been completed for each time division unit (step S4), and not yet completed. In the case of (step S4; NO), the process returns to step S1 to execute the processing of the above steps S1 to S4 for the next time division unit. 4 is finished, the process shown in Fig. 4 is terminated.

[0040] Next, the contents of each of steps S1 to S3 will be described in detail.

[0041] First, as the normalization process in step S1, the same process is performed for all channels. Specifically, the loudness data LD in the time division unit corresponding to one preset channel is described. The control signal S for controlling the input level of the audio data AD of the other channels corresponding to the corresponding time division unit to the amplifiers 4A to 4E or the gains of the amplifiers 4A to 4E themselves. Raw

C

To do. At this time, for example, when the average value of the volume level of the audio data AD in the time division unit corresponding to the loudness data LD power of the one channel is shown. Control signal for obtaining the gain in each amplifier 4A to 4E with the reciprocal thereof

Generate S.

c

[0042] Next, the emphasis processing Z de-emphasis processing is different from the normalization processing described above, and it is said that the emphasis processing Z de-emphasis processing needs to be executed by the loudness data LD. The loudness data L

A control signal S for setting the gain of amplifier 4 using the values described in D is generated.

c

The In this emphasis processing Z de-emphasis processing, the control signal S for linearly correcting the gain of the corresponding amplifier 4 is applied according to the content of the loudness data LD.

C

Or a control signal S for nonlinearly correcting the gain is generated along the NR curve illustrated in FIG. 2 (that is, using human auditory characteristics).

C

If there is something, it will be different.

[0043] Finally, as the multi-channel balance processing, for example, the speakers 5A to 5E are actually installed by using a conventional method such as actually emitting a white noise signal from each speaker 5A to 5E. In advance in the playback environment (reproduction environment not only including the actual position of each of the speakers 5A to 5E but also the acoustic characteristics including the ambient noise and noise conditions described above) in advance. The control signal S for correcting the gain of the amplifier 4 at the time of actual playback is generated using the sound volume correction coefficient for each channel obtained in the above.

C

[0044] At this time, there are various methods for obtaining the volume correction coefficient in advance. For example, a method of manually adjusting the volume balance between the channels may be used. Alternatively, as described above, A method of automatically obtaining a volume correction count by actually detecting a test signal such as a white noise signal from the channel speakers 5A to 5E with a microphone may be used.

[0045] As described above, according to the operation of the reproduction system S according to the embodiment, the sound corresponding to the audio data AD of each channel using the loudness data LD for each channel acquired from the broadcasting station B is used. In addition, the size of the speaker 5A to 5E is further controlled based on the installation position of each speaker 5A to 5E, so that the listener's listening environment including the installation position of the speaker 5A to 5E is a channel. Audio data of AD itself Even if the arrangement is not intended by the producer, it is possible for the listener to listen to each sound with an acoustic characteristic that is well and precisely corrected for each time division unit and each frequency division unit.

[0046] Further, since the loudness data LD acquired together with the audio data AD of each channel is reflected in the control of the sound volume, the listener can listen to each sound while reflecting the intention of the producer of the sound. it can.

[0047] Furthermore, each loudness data LD is a loudness data LD for changing the volume of the corresponding sound based on a preset hearing sensitivity correction characteristic of the person. The sound can be heard by the listener with good acoustic characteristics that are more suitable for the environment.

[0048] Furthermore, each loudness data LD power is the loudness data LD indicating the magnitude of each sound itself for each channel in all frequency bands. Can be controlled.

[0049] In addition, as the normalization process (see step S1 in Fig. 4), when the loudness is controlled in common using the inverse of the value of each loudness data LD as an amplification factor, it is more effective and The normalization process can be executed easily.

[0050] The operation and effect of the present embodiment will be described more specifically as follows.

[0051] That is, first, when applied to an on-vehicle audio device or a so-called theater system for home use, the speaker arrangement correction (see step S3 in Fig. 4) and the content correction (see steps S1 and S2 in Fig. 4). As a result, the ease of listening as a listener can be further improved.

Specifically, for example, in the home, the arrangement of the speakers 5A to 5E cannot be an ideal arrangement as a content creator. When doing so, in general, the content of the movie has the power to modify the multi-channel balance for movie theaters for home use, while it is often used for movie theaters as it is. In the latter case, for example, there are many cases in which the volume of the actor's dialogue is low, for example, the volume of the background is high.

[0053] However, even in such a case, normalization processing and emphasis according to the embodiment Processing By de-emphasis processing and multi-channel balance processing, only the dialogue part is emphasized and reproduced, the background sound is suppressed and reproduced, and the overall dynamic range is suppressed as a frequency characteristic, so that It is possible to set the volume that is easy to hear. As a result, even when the content is changed (for example, even when the battle scene power of a loud sound is changed to a conversation scene of a quiet sound), a good viewing state can be maintained. This is the same in the in-vehicle playback environment.

Second, it becomes possible to adjust the balance between contents.

[0055] That is, within one content, the ability to suppress changes in the viewing environment due to scene changes as in the example described above. Normalization processing, emphasis processing, Z de-emphasis processing, and multi-channel processing are similarly performed between two or more content. Since the balance process can be functioned, the same effect as the above case can be obtained before and after the timing of switching the contents.

[0056] In the above-described embodiment, the power described for the case where the audio data AD and the loudness data LD are separated in the content data D at the stage where the broadcasting station B power is transmitted. For example, the first processing unit 1 in the playback device P separates and extracts loudness data corresponding to the audio data from the content data transmitted to the playback device P, and the volume level is compensated as in the above-described embodiments. It can also be configured to be used for normal processing.

[0057] Further, in the embodiment described above, the loudness data LD for each channel acquired from the broadcasting station B is used to control the volume of sound corresponding to the audio data AD of each channel, For example, the normalization process (see step S1 in FIG. 4) and the emphasis Z de-emphasis process (see FIG. 4). Only step S4 in FIG. 4) may be executed using the loudness data LD for changing the corresponding sound volume based on the human auditory correction characteristic. Even in this case, substantially the same functions and effects as in the above embodiment can be obtained.

[0058] Further, in addition to the case where the broadcasting station B-power content data D is transmitted to the playback device P via a network or broadcasting radio waves as in the above embodiment, for example, a DVD (Digital Versatil e Disc) is recorded on a recording medium such as an optical disc or a node disc, and the corresponding loudness data is recorded on the playback device P owned by the player who has acquired the audio data. The loudness data can be reproduced and used for the sound level correction processing.

Furthermore, in the above-described embodiment, for each unit content data DD, the power described for transmitting audio data AD and control data C (including loudness data LD) corresponding to the audio data AD. For the data LD, in addition to this, a time table in which the loudness data LD and the audio data AD corresponding to the loudness data LD, for example, the playback start time are described in association with each other, is listed at the beginning of the content data D. Alternatively, the loudness data LD can be transmitted by inserting it at a predetermined position. In this case, the playback device that has received it extracts and stores the time table of the content data D, reads out the corresponding loudness data LD as the playback of the audio data AD proceeds, and This is used for controlling the volume level and the like.

In addition, a program corresponding to the flowchart shown in FIG. 4 is recorded on an information recording medium such as a flexible disk or a hard disk, or is acquired and recorded via the Internet or the like, and is read by a general-purpose computer. The computer can be used as the control unit 2 and the second processing units 3A to 3E according to the embodiment.

Claims

The scope of the claims

[1] Sound information including multiple channels of channel sound information corresponding to one channel

Acquisition means for externally acquiring channel sound volume information for each of the channels indicating the sound volume itself corresponding to each of the channel sound information,

A first control means for commonly controlling the volume of the pre-sound corresponding to each channel sound information using each of the channel sound volume information, and a part of the channels. And second control means for controlling the volume of the sound corresponding to the channel sound information corresponding to the part of the channel using the channel sound level information corresponding to the part of the channel. ,

Prepared,

Each of the channel sound volume information is the channel sound volume information for changing the volume of the sound corresponding to the corresponding channel sound information based on preset audibility correction characteristics of the person. A sound control device characterized by the above.

[2] In the sound control device according to claim 1,

Third control means for further controlling the volume of each sound controlled by the first control means and the second control means based on the listening environment when listening to each sound;

A sound control apparatus comprising:

[3] Sound information including channel sound information corresponding to one channel for a plurality of channels, and channel sound size information for each channel indicating the sound size corresponding to each channel sound information. Acquisition means to acquire from outside,

A sound control apparatus comprising:

[4] In the sound control device according to claim 2 or 3,

The sound control apparatus according to claim 1, wherein the listening environment is a listening environment including at least installation positions of speaker means for emitting the sounds.

[5] In the sound control device according to any one of claims 1 to 4,

Each of the channel sound volume information is the channel sound volume information indicating the volume of each sound itself in all frequency bands as the sound. Sound control device.

[6] In the sound control device according to any one of claims 1 to 5,

The sound control apparatus characterized in that the first control means controls the sound volume in common using an inverse of each channel sound volume information value as an amplification factor.

[7] Sound information including a plurality of channels of channel sound information corresponding to one channel, and channel sound volume information for each of the channels indicating the sound volume corresponding to each channel sound information. An acquisition process acquired externally;

A first control step for commonly controlling the volume of the pre-sound corresponding to each of the channel sound information using each of the channel sound volume information, and for some of the channels. A second control step of controlling the volume of the sound corresponding to the channel sound information corresponding to the part of the channel using the channel sound level information corresponding to the part of the channel; ,

Including

Each of the channel sound volume information is the channel sound volume information for changing the volume of the sound corresponding to the corresponding channel sound information based on preset audibility correction characteristics of the person. A sound control method characterized by the above.

[8] A sound control program for causing a computer to function as the sound control device according to any one of claims 1 to 6.