JP2008047969A - Multichannel acoustic device, method and program for locating sound listening position, and multichannel acoustic system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To calculate the sound listening point of a user with a simple configuration easily, and to provide an appropriate sound listening environment at the sound acquisition position. <P>SOLUTION: One of a plurality of speakers LSP, CSP, RSP is used as a speaker. Switching is made so that the rest are used as microphones. Time is measured until sound outputted from the speaker reaches the microphones. The measurement processing is executed to all of the plurality of speakers successively. Based on the measured results, a mutual arrangement relationship to the plurality of speakers LSP, CSP, RSP is identified. All of the plurality of speakers LSP, CSP, RSP are switched to be used as microphones. Then, based on distance corresponding to the difference in arrival time until sound generated from an arbitrary place reaches a plurality of microphones each, the arbitrary place is located as the sound listening point of the user. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a multi-channel sound device, a sound listening position specifying method, a sound listening position specifying program, and a multi-channel sound system. For example, the present invention is applied to a multi-channel sound system having a plurality of speakers arranged in an indoor space or a car interior space. Is preferred.

  Conventionally, in a multi-channel acoustic system in which a plurality of speakers are arranged in an indoor space, depending on the arrangement state of the plurality of speakers and the user's acoustic listening point, the arrival time of the sound reaching the user from the plurality of speakers, respectively However, the user may feel uncomfortable.

  Various inventions have been made to solve such a problem. For example, sound output from a plurality of speakers is picked up by a microphone installed at a user's acoustic listening point and fed back.

However, in this case, although the distance from the plurality of speakers to the user's acoustic listening point is known, there is a problem that the arrangement relationship between the plurality of speakers cannot be understood. As an invention for solving such a problem, there is an acoustic system in which a microphone is individually mounted on a speaker (see, for example, Patent Document 1).
JP2005-198249

  By the way, in an acoustic system having such a configuration, it is necessary to prepare as many special speakers equipped with microphones as the number of channels, and the speaker configuration becomes complicated and existing speakers cannot be used. There was a problem that it was low and it was not easy to use.

  The present invention has been made in consideration of the above points, and can easily calculate the user's acoustic listening point with a simple configuration and provide the user with an optimal acoustic listening environment at the acoustic acquisition position. An apparatus, an acoustic listening position specifying method, an acoustic listening position specifying program, and a multi-channel sound system are proposed.

  In order to solve such a problem, in the present invention, any one of a plurality of speakers is switched by a switching unit that switches between using a plurality of speakers corresponding to the number of channels of at least two channels as a speaker or a microphone. Is used as a speaker and the rest is used as a microphone, the time until the sound output from the speaker reaches the microphone is measured, and the measurement process is sequentially executed for all the speakers. Based on the measurement results, the mutual arrangement relationship between multiple speakers is specified, and after switching to use all the multiple speakers as microphones, the arrival of sound generated from any location until reaching each of the multiple microphones Based on distance according to time difference By specifying the arbitrary location as the user's acoustic listening position, it is possible to easily specify the user's acoustic listening position with a simple configuration simply using the speaker as a microphone if necessary. It is possible to provide the user with an optimal acoustic listening environment according to the acoustic listening position.

  According to the present invention, it is possible to easily identify the user's acoustic listening position with a simple configuration in which the speaker is used as a microphone as required. Therefore, an optimal acoustic listening environment according to the acoustic listening position can be obtained. Multi-channel sound device that can be provided to the user, thus easily specifying the user's acoustic listening position with a simple configuration, and providing the user with the optimum acoustic listening environment at the sound acquisition position, acoustic listening position specification A method, a sound listening position specifying program, and a multi-channel sound system can be realized.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

(1) Principle of the present invention (1-1) Substitution of speaker In the multi-channel acoustic system of the present invention, in order to identify a user's acoustic listening point with a simple configuration and method, first, the mutual arrangement relation to a plurality of speakers is identified. The user's sound acquisition point is specified based on the mutual arrangement relationship.

  In the following, the principle will be described. However, in order to simplify the configuration in the present invention, the speaker and the microphone have the same internal structure, and a method for identifying the mutual arrangement relationship between the plurality of speakers and the acoustic listening are described. In the point specifying method, it is assumed that the speaker is used as a microphone.

  As shown in FIG. 1A, in the speaker SP, when a current corresponding to an audio signal input from an amplifier or the like is passed through the coil L1, a force is generated between the coil L1 and the magnet Mg1, and the coil Sound is generated by vibrating the diaphragm P1 connected to L1, and functions as a speaker.

  On the other hand, in the microphone MF as shown in FIG. 1B, when the diaphragm P2 vibrates when picking up ambient sounds, the coil L2 vibrates in conjunction with it, and a current is induced in the coil L2 by the magnet Mg2. As a result, it functions as a microphone by outputting it as an audio signal to an amplifier or the like.

  As described above, the internal structure of the speaker SP and the microphone MF is basically the same. Therefore, in the present invention, when specifying the positional relationship between the plurality of speakers SP and the user's acoustic listening point, By using the plurality of speakers SP as microphones, it is not necessary to prepare a separate microphone, and the existing speakers SP can be used without complicating the configuration.

(1-2) Speaker Layout Relationship Identification Method As shown in FIG. 2, for example, the right channel (R-ch) right speaker RSP, the left channel (L-ch) left speaker LSP, and the center channel (C-ch). In a multi-channel sound system having a total of three channels consisting of middle speakers CSP, sound is first generated from, for example, the left speaker LSP, and the sound is picked up by the right speaker RSP and the middle speaker CSP.

  In this case, the middle speaker CSP exists on the circumference Lc based on the time from when the sound is generated from the left speaker LSP until the sound reaches the right speaker RSP and the middle speaker CSP, and on the circumference Lr. It can be seen that the right speaker RSP exists.

  Next, sound is generated from the right speaker RSP, and the sound is picked up by the left speaker LSP and the middle speaker CSP. In this case, the middle speaker CSP exists on the circumference Rc based on the time from when the sound is generated from the right speaker RSP until the sound reaches the left speaker LSP and the middle speaker CSP, and on the circumference Rl. It can be seen that the left speaker LSP exists.

  Here, the middle speaker CSP is located at either the intersection C1 or C2 of the circumference Lc and the circumference Rc. Based on the above, the middle speaker CSP generates sound from the middle speaker CSP. By picking up with the left speaker LSP and the right speaker RSP, it can be seen that the left speaker LSP exists on the circumference Cl and the right speaker RSP exists on the circumference Cr.

  Therefore, it is clear from the above that the left speaker LSP is present at the intersection between the circumference Rl and the circumference Cl, and the right speaker RSP is present at the intersection between the circumference Lr and the circumference Cr. If it is either C1 or C2, the mutual arrangement relationship among the right speaker RSP, the left speaker LSP, and the middle speaker CSP is naturally specified.

  Up to this point, the mutual arrangement relationship between the right speaker RSP, the left speaker LSP, and the middle speaker CSP can be specified, and the user can listen to which of the triangles created by the right speaker RSP, the left speaker LSP, and the middle speaker CSP. A method for specifying whether a place has been determined as an acoustic listening point will now be described.

(1-3) User's Sound Listening Point Identification Method In this case, in the multi-channel sound system, the right channel (R-ch) right speaker RSP and the left channel (L-ch) are used to identify the user's sound listening point. The left speaker LSP and the middle speaker CSP of the center channel (C-ch) are set not to function as a speaker but as a microphone so as to pick up surrounding sounds, and as shown in FIG. A sound is generated by, for example, tapping a hand at an arbitrary acoustic listening point POS positioned by the user in a triangle created by the left speaker LSP and the middle speaker CSP.

  In this case, a difference occurs in the arrival time until the sound generated from the user's acoustic listening point POS reaches the right speaker RSP, the left speaker LSP, and the middle speaker CSP. For example, the sound generated from the user's acoustic listening point POS is medium. After reaching the speaker CSP, the left speaker LSP is reached with a delay of a second, and the right speaker RSP is reached with a delay of b seconds.

  The a second delay is converted into a distance Da and the b second delay is converted into a distance Db. The distance from the middle speaker CSP to the user's acoustic listening point POS is a distance n, from the left speaker LSP to the user's acoustic listening point POS. Is the distance Da + n, and the distance from the right speaker RSP to the user's acoustic listening point POS is the distance Db + n.

  Assuming a circle centered on each of the right speaker RSP, the left speaker LSP, and the middle speaker CSP, if the distance n, the distance Da + n, and the distance Db + n are used as radii and n is gradually increased from 0, the intersection of three circles. Will appear and the intersection can be identified as the user's acoustic listening point POS.

(1-4) Creating an acoustic environment in accordance with the acoustic listening point In the multi-channel acoustic system, the mutual arrangement relationship of the right speaker RSP, the left speaker LSP, and the middle speaker CSP is specified as described above, and then the right speaker RSP, If the user's acoustic listening point POS in the triangle created by the left speaker LSP and the middle speaker CSP can be specified, the same timing from the right speaker RSP, the left speaker LSP, and the middle speaker CSP with respect to the acoustic listening point POS, respectively. The time alignment can be adjusted so that the sound reaches the user.

  As a result, in the multi-channel sound system, the arrival times of the sounds that reach the user from the right speaker RSP, the left speaker LSP, and the middle speaker CSP are all aligned, and it is possible in advance to cause the user to feel uncomfortable with the sound. By avoiding this, an optimum acoustic environment can be provided.

  As described above, as the multi-channel sound system using the principle of the present invention described above, the multi-channel sound system in the first embodiment installed in the indoor space and the second embodiment installed in the vehicle interior space. And multi-channel sound systems, respectively, will be described.

(2) First Embodiment (2-1) Circuit Configuration of Multichannel Acoustic System in First Embodiment In FIG. 4, 1 indicates the multichannel acoustic system in the first embodiment as a whole, The multi-channel audio device 1A is configured by a right speaker RSP, a left speaker LSP, and a middle speaker CSP having a three-channel configuration.

  In this multi-channel sound apparatus 1A, a CPU (Central Processing Unit) 2 performs overall control according to a basic program stored in a ROM (Read Only Memory) or the like, and the above-mentioned right-hand side according to an application program such as an acoustic listening position specifying program. After the mutual arrangement relationship among the speaker RSP, the left speaker LSP, and the middle speaker CSP is specified, the user's acoustic listening point POS is specified, and the time alignment is adjusted in accordance with the acoustic listening point POS.

  In practice, the multi-channel acoustic apparatus 1A amplifies an audio signal S1 supplied from a sound source (not shown) by the power amplifier 3, and a current corresponding to the audio signal S1 is output to the right speaker RSP via the switch SW1. A sound is output by flowing into the coil L1 of the speaker LSP and the middle speaker CSP, generating a force between the coil L1 and the magnet Mg1, and vibrating the diaphragm P1 connected to the coil L1.

  The CPU 2 of the multi-channel sound device 1A is provided with a changeover switch for switching between a speaker and a microphone on the front panel of a main body (not shown), and the right speaker RSP according to a user's switching operation on the changeover switch. The left speaker LSP and the middle speaker CSP can be switched between functioning as a speaker or functioning as a microphone.

  Specifically, when the CPU 2 of the multi-channel audio device 1A recognizes that the changeover switch has been selected by the user to operate the right speaker RSP, the left speaker LSP, and the middle speaker CSP as a speaker, the switch SW1. Is output to the switch SW1.

  On the other hand, when the CPU 2 of the multichannel audio device 1A recognizes that the changeover switch has been selected by the user to operate the right speaker RSP, the left speaker LSP, and the middle speaker CSP as a microphone, the switch SW1 is connected to the terminal. A switching signal S2 for switching to the T2 side is output to the switch SW1.

  In the multi-channel acoustic device 1A, when the switch SW1 is switched to the terminal T2 side, the audio signal S1 is not supplied via the power amplifier 3, and the diaphragm P1 vibrates when picking up surrounding sounds, In conjunction with this, the coil L1 vibrates and a current is induced in the coil L1 by the magnet Mg1. As a result, an audio signal S3 corresponding to the surrounding sound is amplified via the microphone amplifier 4 and then sent to the bandpass filter 5. To do.

  The band pass filter 5 extracts a high frequency band audio signal S3H of a predetermined frequency band or more from the audio signal S3 and sends it to the CPU 2. As a result, the right speaker RSP, the left speaker LSP, and the middle speaker CSP cover the characteristic that the cone paper of the diaphragm P1 is heavy, so that it is difficult to pick up the high frequency band, and the microphone performance is deteriorated compared with the case of using a normal microphone. We are careful not to do it.

  The band-pass filter 5 extracts a high-frequency audio signal S3H from the audio signal S3 collected by the right speaker RSP, the left speaker LSP, and the middle speaker CSP functioning as a microphone, thereby obtaining a high-frequency audio signal. It can be made to function as a directional microphone using S3H.

  The CPU 2 of the multichannel acoustic apparatus 1A performs analog-digital conversion on the audio signal S3H and processes the signal as digital audio data S3HD, thereby specifying the mutual arrangement relationship of the right speaker RSP, the left speaker LSP, and the middle speaker CSP described above. The acoustic listening point POS of the user can be specified.

(2-2) Loudspeaker Arrangement Relationship Specification Processing Procedure Subsequently, in the multichannel audio device 1A of the multichannel audio system 1, a processing procedure for specifying the mutual arrangement relationship of the right speaker RSP, the left speaker LSP, and the middle speaker CSP described above. Will be described with reference to the flowchart of FIG.

  The CPU 2 of the multi-channel audio device 1A enters from the start step of the routine RT1 and proceeds to the next step SP1 to set the left speaker LSP to function as a speaker and the right speaker RSP and the middle speaker CSP to function as a microphone. The process proceeds to the next step SP2.

  In this case, specifically, the CPU 2 of the multi-channel sound device 1A outputs a switching signal S2 for switching the switch SW1 to the terminal T1 side for the left speaker LSP to the switch SW1, thereby using the left speaker LSP as a speaker. On the other hand, for the right speaker RSP and the middle speaker CSP, the switching signal S2 for switching the switch SW2 to the terminal T2 side is output to the switch SW1, thereby causing the right speaker RSP and the middle speaker CSP to function as a microphone. Set to.

  In step SP2, the CPU 2 of the multi-channel audio device 1A outputs a predetermined sound from the left speaker LSP functioning as a speaker, and the sound output from the left speaker LSP based on the output start time is the right speaker RSP and the middle speaker CSP. The arrival time until reaching is measured, and the process proceeds to the next step SP3.

  In step SP3, the CPU 2 of the multichannel audio apparatus 1A next sets the middle speaker CSP to function as a speaker and the left speaker LSP and the right speaker RSP to function as a microphone, and then proceeds to the next step SP4.

  Also in this case, specifically, the CPU 2 of the multi-channel audio device 1A outputs the switching signal S2 for switching the switch SW1 to the terminal T1 side for the middle speaker CSP to the switch SW1, thereby making the middle speaker CSP a speaker. On the other hand, for the left speaker LSP and the right speaker RSP, by outputting a switch signal S2 for switching the switch SW2 to the terminal T2 side to the switch SW1, the left speaker LSP and the right speaker RSP function as a microphone. Set as follows.

  In step SP4, the CPU 2 of the multi-channel acoustic device 1A outputs a predetermined sound from the middle speaker CSP functioning as a speaker, and the sounds output from the middle speaker CSP with reference to the output start time are the left speaker LSP and the right speaker RSP. The arrival time until reaching is measured, and the process proceeds to the next step SP5.

  In step SP5, the CPU 2 of the multichannel audio apparatus 1A subsequently sets the right speaker RSP to function as a speaker and the middle speaker CSP and the left speaker LSP to function as a microphone, and proceeds to the next step SP6.

  In step SP6, the CPU 2 of the multichannel acoustic apparatus 1A outputs a predetermined sound from the right speaker RSP functioning as a speaker, and the sound output from the right speaker RSP with reference to the output start time is the middle speaker CSP and the left speaker LSP. The arrival time until reaching is measured, and the process proceeds to the next step SP7.

  In step SP7, the CPU 2 of the multi-channel audio device 1A calculates the distance between the respective speakers (the right speaker RSP, the left speaker LSP, and the middle speaker CSP) based on the arrival time at the right speaker RSP, the left speaker LSP, and the middle speaker CSP. Then, the process proceeds to the next step SP8.

  In step SP8, the CPU 2 of the multichannel audio apparatus 1A specifies the mutual arrangement relationship between the speakers based on the distance between the speakers (the right speaker RSP, the left speaker LSP, and the middle speaker CSP), and proceeds to the next step SP9. The process is terminated.

(2-3) User acoustic listening point identification processing procedure Subsequently, in the multi-channel acoustic apparatus 1A, after the mutual arrangement relationship of the right speaker RSP, the left speaker LSP, and the middle speaker CSP described above is identified, A processing procedure for identifying whether or not a listening point exists will be described with reference to the flowchart of FIG.

  The CPU 2 of the multi-channel audio device 1A enters from the start step of the routine RT2, moves to the next step SP11, sets the right speaker RSP, the left speaker LSP, and the middle speaker CSP to function as a microphone, and then performs the next step SP12. Move on.

  In step SP12, the CPU 2 of the multichannel acoustic apparatus 1A causes the right speaker RSP, the left speaker LSP, and the sound generated from any acoustic listening point POS in the triangle created by the right speaker RSP, the left speaker LSP, and the middle speaker CSP. The difference in arrival time to the middle speaker CSP is measured, and the process proceeds to the next step SP13.

  In step SP13, the CPU 2 of the multi-channel acoustic device 1A calculates the distance between the user's acoustic listening point POS and each speaker (right speaker RSP, left speaker LSP, and middle speaker CSP) based on the difference in arrival time. Then, the process proceeds to the next step SP14.

  In step SP14, the CPU 2 of the multi-channel sound device 1A determines the distance n between the user's acoustic listening point POS and the middle speaker CSP), the distance Da + n between the acoustic listening point POS and the left speaker LSP, the acoustic listening point POS and the right speaker RSP. The intersection determined based on the distance Db + n is identified as the user's acoustic listening point POS, and the process proceeds to the next step SP15 to end the process.

(2-4) Volume Adjustment Processing Procedure According to Speaker Arrangement Next, in the multi-channel acoustic apparatus 1A, the arrangement of the right speaker RSP, the left speaker LSP, and the middle speaker CSP that exist so as to surround the user's acoustic listening point POS. A volume adjustment processing procedure for controlling the volume adjustment of the volume in accordance with the area determined by the above will be described.

  The CPU 2 of the multi-channel acoustic device 1A enters from the start step of the routine RT3 and moves to the next step SP21, and the right speaker RSP, the left speaker LSP, and the middle speaker CSP according to the arrangement relationship specifying process procedure of the routine RT1 described above (FIG. 5). The mutual arrangement relationship is obtained and calculated as a coordinate value on a two-dimensional coordinate, and the process proceeds to the next step SP22.

  In step SP22, the CPU 2 of the multi-channel audio device 1A uses the two-dimensional coordinate values of the right speaker RSP, the left speaker LSP, and the middle speaker CSP, and surrounds the speaker environment surrounded by the right speaker RSP, the left speaker LSP, and the middle speaker CSP ( The area of the triangle is calculated, and the process proceeds to the next step SP23.

In step SP23, the CPU 2 of the multichannel audio apparatus 1A determines whether or not the area of the speaker environment is 5 m ² or less, and if an affirmative result is obtained, the CPU 2 proceeds to the next step SP24.

In step SP24, the CPU 2 of the multi-channel acoustic device 1A has the user's acoustic listening point POS within a narrow range where the area of the speaker environment is 5 m ² or less. In this case, from the right speaker RSP, the left speaker LSP, and the middle speaker CSP. Since the distance to the acoustic listening point POS is short, the volume level per step at the time of volume adjustment is set to 0.5 [dB], for example, and the process proceeds to the next step SP8 and ends.

On the other hand, if a negative result is obtained in step SP23, the CPU 2 of the multichannel audio device 1A moves to the next step SP25, determines whether the area of the speaker environment is 10 m ² or less, and obtains a positive result. If so, the process proceeds to the next step SP26.

In step SP26, the CPU ² of the multi-channel acoustic device 1A has a user's acoustic listening point POS within the range of the speaker environment within 10 m ² or less, but is larger than the case where the area of the speaker environment is 5 m ² or less. The volume level per step at the time of volume adjustment is set to, for example, 1.0 [dB], the process proceeds to the next step SP8, and the process is terminated.

On the other hand, if a negative result is obtained in step SP25, this indicates that the user's acoustic listening point POS exists within a wide range where the area of the speaker environment exceeds 10 m ^2. The CPU 2 of the apparatus 1A moves to the next step SP27.

In step SP27, the CPU ² of the multichannel audio apparatus 1A has the user's audio listening point POS within a wide range where the area of the speaker environment exceeds 10 m ^2, and the audio listening point from the right speaker RSP, the left speaker LSP, and the middle speaker CSP. Since the distance to the POS is far, the volume level per step at the time of volume adjustment is set to 2.0 [dB], for example, and the process proceeds to the next step SP8 and ends.

(2-5) Operation and Effect in First Embodiment In the above configuration, the CPU 2 of the multichannel audio device 1A not only allows the right speaker RSP, the left speaker LSP, and the middle speaker CSP to function as a speaker, but also a microphone. As a switching structure that can function as a speaker, the mutual arrangement relationship of the right speaker RSP, the left speaker LSP, and the middle speaker CSP and the user's acoustic listening point POS are obtained by simple calculation, and matched to the acoustic listening point POS. If the time alignment adjustment is performed, the optimum acoustic environment for the acoustic listening point POS that the user actually exists can be compared with the conventional one without providing a microphone individually or using a special speaker equipped with a microphone. Can be provided more easily. The

  In addition, the multi-channel audio device 1A allows the right speaker RSP, the left speaker LSP, and the middle speaker CSP to function as a speaker while also functioning as a microphone, and the speaker and the microphone are arranged in the same place. Since it is synonymous, the accuracy in specifying the mutual arrangement relationship of the right speaker RSP, the left speaker LSP, and the middle speaker CSP as compared with the conventional case where the speaker and the microphone cannot exist at the same position, and the user's acoustic listening The accuracy at the time of specifying the point POS can be significantly improved as compared with the prior art.

  Furthermore, the multi-channel sound device 1A allows the right speaker RSP, the left speaker LSP, and the middle speaker CSP to function as a speaker, and can also function as a microphone by using the same diaphragm P1 by switching the switch SW1. A speaker can be used, and versatility can be improved.

  Furthermore, even if the user's acoustic listening point POS is changed, the multichannel audio apparatus 1A can instantaneously switch the right speaker RSP, the left speaker LSP, and the middle speaker CSP from the speaker to the microphone by switching the switch SW1. Therefore, the acoustic listening point POS can be specified extremely easily and in a short time compared to the conventional case where the microphone is installed each time.

  By the way, in the multi-channel acoustic device 1A, after specifying the acoustic listening point POS, an optimal acoustic environment can be provided to the user by performing an optimal time alignment adjustment according to the acoustic listening point POS. In addition, by using a volume adjustment corresponding to the area of the speaker environment surrounded by the right speaker RSP, the left speaker LSP, and the middle speaker CSP, an acoustic environment with an optimal volume level considering the distance from each speaker to the user Can be provided.

  Furthermore, the multi-channel acoustic device 1A amplifies the audio signal S3 by the microphone amplifier 4 and then extracts the audio signal S3H in the high frequency band by the band-pass filter 5, so that the right speaker RSP, the left speaker LSP, and Since the high-frequency band audio signal S3H, which is often insufficient when the middle speaker CSP simply functions as a microphone, can be extracted by the bandpass filter 5, the microphone performance may be deteriorated as compared with the case of using a normal microphone. In addition, the right speaker RSP, the left speaker LSP, and the middle speaker CSP can be made to function as a directional microphone.

  According to the above configuration, in the multi-channel acoustic device 1A of the multi-channel acoustic system 1, the user can easily identify the acoustic listening point POS with a simple configuration and method, and the optimum acoustic listening environment at the acoustic acquisition point POS is determined. Can be provided to the user.

(3) Second Embodiment (3-1) In-Vehicle Space Arrangement State of Multichannel Acoustic System in Second Embodiment In FIG. 8, reference numeral 11 denotes the multichannel acoustic system in the second embodiment as a whole. The car audio device 12 is installed near the front console in the interior space of the vehicle VH, and the front right speaker FRSP, the front left speaker FLSP, the rear right speaker RRSP, and the rear left speaker RLSP are installed at the four corners of the interior space. Have a configuration.

(3-2) Circuit Configuration of Car Audio Device in Second Embodiment As shown in FIG. 9 in which parts corresponding to those in FIG. Performs overall control according to a basic program stored in a ROM (Read Only Memory) or the like, and the above-described front right speaker FRSP, front left speaker FLSP, rear right speaker RRSP and rear according to an application program such as an acoustic listening position specifying program. After specifying the mutual arrangement relationship of the left speakers RLSP, the user's acoustic listening point POS is specified, and time alignment adjustment is performed in accordance with the acoustic listening point POS.

  In practice, the CPU 2 of the car audio device 12 controls the disk drive unit 14 based on a command supplied through the user's operation on the input button 13, such as a CD (Compact Disc) or a DVD (Digital Versatile Disc). The optical disk is reproduced, the audio signal S1 is supplied to the power amplifier 3, and various reproduction information and the like are displayed on a display 15 such as an LCD (Liquid Crystal Display).

  In practice, the car audio device 12 of the multi-channel sound system 11 amplifies the audio signal S1 supplied from the disk drive unit 14 with the power amplifier 3, and the current corresponding to the audio signal S1 is transferred to the front right via the switch SW1. It flows into the coil L1 of the speaker FRSP, the front left speaker FLSP, the rear right speaker RRSP and the rear left speaker RLSP, generates a force between the coil L1 and the magnet Mg1, and vibrates the diaphragm P1 connected to the coil L1. Sound is output.

  The CPU 2 of the car audio apparatus 12 is provided with a changeover switch for switching between a speaker and a microphone on the front panel of a main body (not shown) as one of the input buttons 13, and a user's switching operation with respect to the changeover switch Accordingly, the front right speaker FRSP, the front left speaker FLSP, the rear right speaker RRSP, and the rear left speaker RLSP are switched between functioning as a speaker or functioning as a microphone.

  Specifically, the CPU 2 of the car audio device 12 is selected so that the front right speaker FRSP, the front left speaker FLSP, the rear right speaker RRSP, and the rear left speaker RLSP function as a speaker when the changeover switch is operated by the user. Is recognized, a switching signal S2 for switching the switch SW1 to the terminal T1 is output to the switch SW1.

  On the other hand, the CPU 2 of the car audio device 12 recognizes that the changeover switch has been operated by the user to select the front right speaker FRSP, the front left speaker FLSP, the rear right speaker RRSP, and the rear left speaker RLSP to function as a microphone. In this case, a switching signal S2 for switching the switch SW1 to the terminal T2 is output to the switch SW1.

  In the car audio device 12, when the switch SW1 is switched to the terminal T2 side, the audio signal S1 is not supplied via the power amplifier 3, and the diaphragm P1 vibrates when the surrounding sound is picked up. As a result of the vibration of the coil L1 and the induction of a current in the coil L1 by the magnet Mg1, an audio signal S3 corresponding to the surrounding sound is amplified via the microphone amplifier 4 and then sent to the bandpass filter 5. .

  The band pass filter 5 extracts a high frequency band audio signal S3H of a predetermined frequency band or more from the audio signal S3 and sends it to the CPU 2. As a result, the front right speaker FRSP, the front left speaker FLSP, the rear right speaker RRSP, and the rear left speaker RLSP cover the characteristic that the cone paper of the diaphragm P1 is heavy so that it is difficult to pick up the high frequency band, and an ordinary microphone is used. Consideration is made so that the microphone performance does not deteriorate compared to the time.

  The band-pass filter 5 extracts a high-frequency audio signal S3H among the audio signals S3 collected by the front right speaker FRSP, the front left speaker FLSP, the rear right speaker RRSP, and the rear left speaker RLSP that function as a microphone. Thus, it can function as a directional microphone using the audio signal S3H in the high frequency band.

  The CPU 2 of the car audio device 12 performs analog-digital conversion on the audio signal S3H and performs signal processing as digital audio data S3HD, whereby the front right speaker FRSP, the front left speaker FLSP, the rear right speaker RRSP, and the rear left speaker RLSP described above. Thus, the user can specify the user's acoustic listening point POS.

(3-3) Speaker Arrangement Relationship Identification Processing Procedure Subsequently, in the car audio device 12 of the multi-channel acoustic system 11, the front right speaker FRSP, the front left speaker FLSP, the rear right speaker RRSP, and the rear left speaker RLSP described above are included. The mutual arrangement relationship can be specified according to the flowchart of FIG.

  Specifically, the CPU 2 of the car audio device 12 enters from the start step of the routine RT4 and moves to the next step SP31, where the front right speaker FRSP functions as a speaker, and the front left speaker FLSP, the rear right speaker RRSP, and the rear The left speaker RLSP is set to function as a microphone, and the process proceeds to the next step SP32.

  In this case, specifically, the CPU 2 of the car audio device 12 outputs the switching signal S2 for switching the switch SW1 to the terminal T1 side for the front right speaker FRSP to the switch SW1, so that the front right speaker FRSP is connected to the speaker. On the other hand, for the front left speaker FLSP, the rear right speaker RRSP, and the rear left speaker RLSP, by outputting a switch signal S2 for switching the switch SW2 to the terminal T2 side to the switch SW1, the front left speaker FLSP, The rear right speaker RRSP and the rear left speaker RLSP are set to function as microphones.

  In step SP32, the CPU 2 of the car audio device 12 outputs a predetermined sound from the front right speaker FRLSP that functions as a speaker, and the sound output from the front right speaker FRSP based on the output start time is the front left speaker FLSP, rear The arrival time until reaching the right speaker RRSP and the rear left speaker RLSP is measured, and the process proceeds to the next step SP33.

  In step SP33, the CPU 2 of the car audio device 12 next sets the front left speaker FLSP to function as a speaker and the front right speaker FRSP, the rear right speaker RRSP, and the rear left speaker RLSP to function as a microphone. The process proceeds to step SP34.

  Also in this case, specifically, the CPU 2 of the car audio device 12 outputs the switching signal S2 for switching the switch SW1 to the terminal T1 side for the front left speaker FLSP to the switch SW1, so that the front left speaker FLSP is turned on. While functioning as a speaker, for the front right speaker FRSP, the rear right speaker RRSP, and the rear left speaker RLSP, the switching signal S2 for switching the switch SW2 to the terminal T2 side is output to the switch SW1, thereby the front right speaker FRSP. The rear right speaker RRSP and the rear left speaker RLSP are set to function as a microphone.

  In step SP34, the CPU 2 of the car audio device 12 outputs a predetermined sound from the front left speaker FLSP that functions as a speaker, and the sound output from the front left speaker FLSP based on the output start time is the front right speaker FRSP, rear The arrival time until reaching the right speaker RRSP and the rear left speaker RLSP is measured, and the process proceeds to the next step SP35.

  In step SP35, the CPU 2 of the car audio device 12 subsequently sets the rear right speaker RRSP to function as a speaker, and sets the front right speaker FRSP, the front left speaker FLSP, and the rear left speaker RLSP to function as a microphone. The process proceeds to step SP36.

  In step SP36, the CPU 2 of the car audio device 12 outputs a predetermined sound from the rear right speaker RRSP that functions as a speaker, and the sound output from the rear right speaker RRSP based on the output start time serves as the front right speaker FRSP, the front The arrival time until reaching the left speaker FLSP and the rear left speaker RLSP is measured, and the process proceeds to the next step SP37.

  In step SP37, the CPU 2 of the car audio device 12 subsequently sets the rear left speaker RLSP to function as a speaker, and sets the front right speaker FRSP, the front left speaker FLSP, and the rear right speaker RRSP to function as a microphone. The process proceeds to step SP38.

  In step SP38, the CPU 2 of the car audio device 12 outputs a predetermined sound from the rear left speaker RLSP that functions as a speaker, and the sound output from the rear left speaker RLSP based on the output start time is the front right speaker FRSP, front front The arrival time until reaching the left speaker FLSP and the rear right speaker RRSP is measured, and the process proceeds to the next step SP39.

  In step SP39, the CPU 2 of the car audio device 12 determines each speaker (front right speaker FRSP, front left speaker FLSP, front left speaker FRSP, front left speaker FLSP, front left speaker FLSP, front left speaker FLSP, front left speaker FLSP, front left speaker FLSP, front left speaker FLSP, The distance between the rear right speaker RRSP and the rear left speaker RLSP) is calculated, and the process proceeds to the next step SP40.

  In step SP40, the CPU 2 of the car audio device 12 specifies the mutual arrangement relationship between the speakers based on the distance between the speakers (front right speaker FRSP, front left speaker FLSP, rear right speaker RRSP, and rear left speaker RLSP). Then, the process proceeds to the next step SP41 to end the process.

(3-4) User acoustic listening point identification processing procedure Subsequently, in the car audio device 12 of the multi-channel acoustic system 11, the front right speaker FRSP, the front left speaker FLSP, the rear right speaker RRSP, and the rear left speaker RLSP described above are included. A processing procedure for specifying which acoustic listening point the user has in the vehicle interior space after specifying the mutual arrangement relationship will be described with reference to the flowchart of FIG. 11.

  The CPU 2 of the car audio apparatus 12 enters from the start step of the routine RT5 and proceeds to the next step SP51 so that the front right speaker FRSP, the front left speaker FLSP, the rear right speaker RRSP, and the rear left speaker RLSP all function as microphones. Set and move to next step SP52.

  In step SP52, the CPU 2 of the car audio device 12 determines an arbitrary acoustic listening point POS (for example, a driver seat or a passenger seat) in a quadrangle created by the front right speaker FRSP, the front left speaker FLSP, the rear right speaker RRSP, and the rear left speaker RLSP. And the like, the difference in arrival time of the sound generated by the user to the front right speaker FRSP, the front left speaker FLSP, the rear right speaker RRSP and the rear left speaker RLSP is measured, and the process proceeds to the next step SP53.

  In step SP53, the CPU 2 of the car audio apparatus 12 determines the user's acoustic listening point POS and each speaker (front right speaker FRSP, front left speaker FLSP, rear right speaker RRSP, and rear left speaker RLSP based on the difference in arrival time. ) And the process proceeds to the next step SP54.

  In step SP54, the CPU 2 of the car audio device 12 determines the distance between the user's acoustic listening point POS and the front right speaker FRSP, the distance between the acoustic listening point POS and the front left speaker FLSP, and the acoustic listening point POS and the rear right speaker RRSP. The intersection determined based on the distance and the distance between the acoustic listening point POS and the rear left speaker RLSP is identified as the acoustic listening point POS on which the user is currently seated, and the process proceeds to the next step SP55 to end the process. .

(3-5) Volume Adjustment Processing Procedure According to Speaker Arrangement Next, in the car audio device 12 of the multi-channel acoustic system 11, the front right speaker FRSP and the front left speaker that exist so as to surround the user's acoustic listening point POS. A volume adjustment processing procedure for controlling volume adjustment according to the area of the speaker environment (quadrangle) determined by the arrangement of the FLSP, the rear right speaker RRSP, and the rear left speaker RLSP will be described.

  The CPU 2 of the car audio apparatus 12 enters from the start step of the routine RT6 shown in FIG. 12 and proceeds to the next step SP61. The mutual arrangement relationship between the FLSP, the rear right speaker RRSP, and the rear left speaker RLSP is obtained, calculated as a coordinate value on two-dimensional coordinates, and the process proceeds to the next step SP62.

  In step SP62, the CPU 2 of the car audio device 12 uses the two-dimensional coordinate values of the front right speaker FRSP, the front left speaker FLSP, the rear right speaker RRSP, and the rear left speaker RLSP, to thereby calculate the front right speaker FRSP, the front left speaker FLSP, The area of the speaker environment (quadrangle) surrounded by the rear right speaker RRSP and the rear left speaker RLSP is calculated, and the process proceeds to the next step SP63.

In step SP63, the CPU 2 of the car audio device 12 determines whether or not the area of the speaker environment is 2 m ² or less, for example. If an affirmative result is obtained, the process proceeds to the next step SP64.

In step SP64, the CPU 2 of the car audio device 12 has the user's acoustic listening point POS within a narrow vehicle space where the area of the speaker environment is 2 m ² or less, and the front right speaker FRSP, the front left speaker FLSP, and the rear right speaker. Since the distance from the RRSP and the rear left speaker RLSP to the acoustic listening point POS is generally short, the volume level per step of volume adjustment is set to 0.5 [dB], for example, and the process proceeds to the next step SP68. Exit.

On the other hand, if a negative result is obtained in step SP63, the CPU 2 of the car audio device 12 proceeds to the next step SP65, determines whether or not the area of the speaker environment is 5 m ² or less, and a positive result is obtained. Then, the process proceeds to the next step SP66.

In step SP66, the CPU ² of the car audio device 12 does not adjust the volume because the area of the speaker environment is 2 m ² or more although the user's acoustic listening point POS exists in the interior space of the speaker environment of 5 m ² or less. The volume level per step is set to, for example, 1.0 [dB], and the process proceeds to the next step SP68 to end the process.

On the other hand, if a negative result is obtained in step SP65, this indicates that the user's acoustic listening point POS exists within a wide vehicle space where the area of the speaker environment exceeds 5 m ^2. The CPU 2 of the car audio apparatus 12 proceeds to the next step SP67.

CPU2 of the vehicle audio apparatus 12 in step SP67, then there is a user acoustic listening point POS of within a wide range of interior space area of the speaker environment exceeds 5 m ^2, the front right speaker FRSP, the front left speaker FLSP, rear right speaker Since the distance from the RRSP and the rear left speaker RLSP to the user's acoustic listening point POS is relatively long, the volume level per step of volume adjustment is set to 2.0 [dB], for example, and the process proceeds to the next step SP68. The process ends.

(3-6) Operation and Effect in Second Embodiment In the configuration described above, the CPU 2 of the audio device 12 in the multi-channel sound system 11 has the front right speaker FRSP, the front left speaker FLSP, the rear right speaker RRSP, and the rear left The switching structure that allows the speaker RLSP not only to function as a speaker but also to function as a microphone is sometimes used. If the acoustic listening point POS is obtained by simple calculation and time alignment adjustment is performed in accordance with the acoustic listening point POS, a microphone is individually provided or a special speaker equipped with the microphone is installed. Without using a speaker, it is possible to more easily provide an optimal acoustic environment for an actual acoustic listening point POS on which a user is seated in a vehicle interior space as compared with the prior art.

  The car audio device 12 of the multi-channel sound system 11 can function as a microphone while the front right speaker FRSP, the front left speaker FLSP, the rear right speaker RRSP and the rear left speaker RLSP can function as a speaker. Since the microphone and the microphone are synonymous with each other at the same location, the front right speaker FRSP, the front left speaker FLSP, and the rear right speaker RRSP are compared with the conventional case where the speaker and the microphone cannot be present at the same position. And the precision at the time of specifying the mutual arrangement | positioning relationship of rear left speaker RLSP and the precision at the time of specifying a user's acoustic listening point POS can be improved markedly conventionally.

  Further, the car audio device 12 of the multi-channel sound system 11 causes the front right speaker FRSP, the front left speaker FLSP, the rear right speaker RRSP, and the rear left speaker RLSP to function as a speaker, while using the same diaphragm P1 by switching the switch SW1. Therefore, the existing speaker can be used and versatility can be improved.

  Further, the car audio device 12 of the multi-channel sound system 11 can change the front right speaker FRSP, the front left speaker FLSP, the rear right speaker RRSP, and the rear by switching the switch SW1 even when the user's acoustic listening point POS is changed. Since the left speaker RLSP can be instantaneously switched from the speaker to the microphone, the acoustic listening point POS can be specified very easily and in a short time compared to the conventional case where the microphone is installed each time.

  By the way, in the car audio apparatus 12 of the multi-channel sound system 11, after specifying the acoustic listening point POS, an optimal acoustic environment can be provided by performing an optimal time alignment adjustment according to the acoustic listening point POS. In addition to the volume adjustment corresponding to the area of the speaker environment surrounded by the front right speaker FRSP, the front left speaker FLSP, the rear right speaker RRSP, and the rear left speaker RLSP, It is possible to provide an acoustic environment having an optimum volume level in consideration of the distance.

  Further, the car audio device 12 of the multi-channel sound system 11 amplifies the audio signal S3 by the microphone amplifier 4 and then extracts the high frequency band audio signal S3H by the bandpass filter 5, thereby enabling the front right speaker. Since the FRSP, the front left speaker FLSP, the rear right speaker RRSP, and the rear left speaker RLSP can be extracted by the bandpass filter 5 because the high frequency band audio signal S3H, which is often insufficient simply by functioning as a microphone, can be used. The microphone performance does not deteriorate as compared with the case where it is used, and the right speaker RSP, the left speaker LSP, and the middle speaker CSP can also function as a directional microphone.

  According to the above configuration, the car audio device 12 of the multi-channel acoustic system 11 easily calculates the user's acoustic listening point POS in the interior space of the vehicle VH with a simple configuration and method, and optimizes the acoustic acquisition point POS. It is possible to provide a user with a sound listening environment.

(4) Other Embodiments In the above-described first embodiment, a three-channel speaker including a right speaker RSP, a left speaker LSP, and a middle speaker CSP is used. In the second embodiment, the front Although the case where four-channel speakers including the right speaker FRSP, the front left speaker FLSP, the rear right speaker RRSP, and the rear left speaker RLSP are used has been described, the present invention is not limited to this, and speakers of at least two channels or more are used. If used, the number is not limited.

  In the first and second embodiments described above, the case has been described in which the time alignment adjustment is performed so that the arrival time of the sound from each speaker is aligned with respect to the user's acoustic listening point POS. However, the present invention is not limited to this, and if it is possible to provide a sound environment that does not feel uncomfortable for the user, time alignment adjustment is performed so as to slightly shift the arrival time of the sound from each speaker, The adjustment process according to the above method may be executed.

  Further, in the second embodiment described above, the case where the volume adjustment processing procedure (FIG. 12) according to the speaker arrangement is performed has been described. However, the present invention is not limited to this, and the user's sound in the vehicle interior space is described. Only for the speaker closest to the seat where the user such as the driver's seat and the passenger's seat is seated based on the listening point POS, the volume level per step of the volume is further lowered by a predetermined level, so that only one speaker is the other speaker. It may be possible to avoid a situation in which the sound is output at a loud volume compared to the above.

  Furthermore, in the second embodiment described above, any one of the speakers (front right speaker FRSP, front left speaker FLSP, rear right speaker RRSP and rear left speaker RLSP) is caused to function as a speaker, and the rest as a microphone. The case where the mutual arrangement relationship of the speakers is specified by functioning and the acoustic listening point POS is specified has been described. However, the present invention is not limited to this, and thereafter, the front right speaker FRSP and the front left speaker are described. By switching between the FLSP functioning as a microphone and the rear right speaker RRSP and the rear left speaker RLSP functioning as speakers, a user seated in the front row seat can be used for a user seated in the back row seat. When talking, don't look back It is only necessary to the story while still facing forward of, it is possible to improve the usability.

  Furthermore, in the first and second embodiments described above, the CPU 2 specifies the mutual arrangement relationship of the speakers described above according to the acoustic listening position specifying program stored in advance in a ROM (Read Only Memory) or the like. However, the present invention is not limited to this, and the acoustic listening position specifying program installed from the recording medium is not limited to this, but the acoustic listening point POS is specified and the time alignment adjustment is performed in accordance with the acoustic listening point POS. The mutual arrangement relationship between the speakers, the acoustic listening point POS, and the time alignment adjustment in accordance with the acoustic listening point POS may be executed according to the acoustic listening position specifying program downloaded from the Internet.

  Furthermore, in the first and second embodiments described above, the switch SW1 as the switching means and the CPU 2 as the measurement means, the speaker arrangement relationship specifying means, and the acoustic listening point specifying means are used as the multichannel sound device of the present invention. Although the case where the multi-channel sound device 1A and the car audio device 12 are configured has been described, the present invention is not limited to this, and the switching means, the measuring means, the speaker arrangement relationship specifying means, and the acoustic listening are not limited to this. The multi-channel audio device of the present invention may be configured by point specifying means.

  The multi-channel sound device, the sound listening position specifying method, the sound listening position specifying program, and the multi-channel sound system of the present invention can be applied to a multi-channel sound system such as a theater or a movie theater having a plurality of speakers, for example.

It is a basic diagram with which it uses for description of the operation principle of a speaker and a microphone. It is a basic diagram with which it uses for description of the arrangement | positioning relationship specific method of a speaker. It is a basic diagram with which it uses for description of the acoustic listening point identification method. 1 is a schematic block diagram illustrating a configuration of a multi-channel acoustic system according to a first embodiment. It is a flowchart which shows the arrangement | positioning relationship specific process sequence of the speaker in 1st Embodiment. It is a flowchart which shows the acoustic listening point specific process sequence in 1st Embodiment. It is a flowchart which shows the volume adjustment processing procedure according to speaker arrangement | positioning in 1st Embodiment. It is a basic diagram which shows the vehicle interior space arrangement state of the multi-channel acoustic system in 2nd Embodiment. It is a rough-line block diagram which shows the circuit structure of a car audio apparatus. It is a flowchart which shows the arrangement | positioning relationship specific process sequence of the speaker in 2nd Embodiment. It is a flowchart which shows the acoustic listening point specific process sequence in 2nd Embodiment. It is a flowchart which shows the volume adjustment processing procedure according to speaker arrangement | positioning in 2nd Embodiment.

Explanation of symbols

  1, 11: Multi-channel sound system, 2: CPU, 3: Power amplifier, 4: Microphone amplifier, 5: Band pass filter, 12: Car audio device, 13: Input button, 14: Disk drive unit, 15 ... display, L1, L2 ... coil, Mg1, Mg2 ... magnet, P1, P2 ... diaphragm, RSP ... right speaker, LSP ... left speaker, CSP ... medium speaker, FRSP …… Front right speaker, FLSP …… Front left speaker, RRSP …… Rear right speaker, RLSP …… Rear left speaker.

Claims (6)

Switching means for switching between using a plurality of speakers corresponding to at least two channels or more as a speaker or a microphone;
Measures the time it takes for the sound output from the speaker to reach the microphone after switching to use one of the plurality of speakers as a speaker and the rest as a microphone by the switching means. Measuring means for sequentially executing the measurement process for all the plurality of speakers;
Speaker arrangement relationship specifying means for specifying the mutual arrangement relationship with respect to the plurality of speakers based on a measurement result by the measurement means;
After switching to use all the plurality of speakers as microphones by the switching means, based on the distance according to the difference in arrival time until the sound generated from any place reaches the plurality of microphones, respectively. A multi-channel sound apparatus comprising: an acoustic listening position specifying unit that specifies the arbitrary place as a user's acoustic listening position. The multi-channel acoustic device is
The multi-channel acoustic device according to claim 1, further comprising: time alignment adjustment means for performing time alignment adjustment on the acoustic listening position specified by the acoustic listening position specifying means. The multi-channel acoustic device according to claim 1, further comprising: filter means for extracting a sound component having a predetermined frequency band or higher from the sound collected by reaching the microphone. A switching unit that switches between using a plurality of speakers corresponding to the number of channels of at least two channels as a speaker or a microphone, and using any one of the plurality of speakers as a speaker and the remaining as a microphone. A first switching step for switching
A measurement step of measuring a time until the sound output from the speaker reaches the microphone after being switched by the first switching step, and sequentially executing the measurement process for all of the plurality of speakers;
A speaker arrangement relationship specifying step for specifying a mutual arrangement relationship for the plurality of speakers based on a measurement result of the measurement step;
A second switching step for switching to use all of the plurality of speakers as a microphone;
After switching to use all of the plurality of speakers as microphones in the second switching step, the distance corresponding to the difference in arrival time until the sound generated from an arbitrary location reaches the plurality of microphones, respectively. An acoustic listening position specifying method comprising: an acoustic listening position specifying step of specifying the arbitrary place as a user's acoustic listening position based on the above. For information processing equipment
A switching unit that switches between using a plurality of speakers corresponding to the number of channels of at least two channels as a speaker or a microphone, and using any one of the plurality of speakers as a speaker and the remaining as a microphone. A first switching step for switching
A measurement step of measuring a time until the sound output from the speaker reaches the microphone after being switched by the first switching step, and sequentially executing the measurement process for all of the plurality of speakers;
A speaker arrangement relationship specifying step for specifying a mutual arrangement relationship for the plurality of speakers based on a measurement result of the measurement step;
A second switching step for switching to use all of the plurality of speakers as a microphone;
After switching to use all of the plurality of speakers as microphones in the second switching step, the distance corresponding to the difference in arrival time until the sound generated from an arbitrary location reaches the plurality of microphones, respectively. An acoustic listening position specifying program comprising: an acoustic listening position specifying step for specifying the arbitrary place as a user's acoustic listening position based on the above. A plurality of speakers corresponding to at least two channels, and
Switching means for switching whether the plurality of speakers are used as a speaker or a microphone;
Measures the time it takes for the sound output from the speaker to reach the microphone after switching to use one of the plurality of speakers as a speaker and the rest as a microphone by the switching means. Measuring means for sequentially executing the measurement process for all the plurality of speakers;
Speaker arrangement relationship specifying means for specifying the mutual arrangement relationship with respect to the plurality of speakers based on a measurement result by the measurement means;
After switching to use all the plurality of speakers as microphones by the switching means, based on the distance according to the difference in arrival time until the sound generated from any place reaches the plurality of microphones, respectively. A multi-channel acoustic system comprising: an acoustic listening position specifying means for specifying the arbitrary place as a user's acoustic listening position.

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