JP4889121B2 - Acoustic device, delay measurement method, delay measurement program, and recording medium therefor - Google Patents

Description

  The present invention relates to an acoustic device, a delay measurement method, a delay measurement program, and a recording medium on which the delay measurement program is recorded.

  Accompanying the development of recording media such as CD (Compact Disk) and DVD (Digital Versatile Disk) in recent years, acoustic devices including a plurality of multi-channel surround speakers have been developed. By using such an acoustic device, it has become possible to enjoy surround sound full of a sense of reality not only in home spaces but also in vehicle spaces.

  By the way, since the installation environment of an audio apparatus is various, the case where a some speaker cannot be arrange | positioned in the position which has the symmetry in the viewpoint of a multichannel surround system often occurs. In particular, when a multi-channel surround sound system is mounted on a vehicle, multiple speakers are placed at positions that have symmetry recommended from the viewpoint of the multi-channel surround method due to restrictions on the seating position that is the listening position. Can not do it. For this reason, when the positional relationship between each speaker and the listening position in the acoustic apparatus does not have the symmetry, the output timing of the sound output from each speaker is adjusted (hereinafter also referred to as “time alignment correction”). )There is a need.

  As such a time alignment correction method, a microphone is installed at an assumed listening position such as a headrest of a driver's seat, and the sound output from each speaker is collected by the microphone, whereby the propagation delay time of the output sound from each speaker Is generally employed (see Patent Document 1 and the like: hereinafter referred to as “conventional example”).

Japanese Patent Laid-Open No. 7-212896

  By the way, when a microphone is installed at the headrest of the driver's seat as an assumed listening position as in the conventional example, the sound output from a speaker (for example, a left speaker or a right speaker) arranged in front of the assumed listening position. Can collect sound directly with a microphone. However, for sound output from a speaker (for example, a surround left speaker or a surround right speaker) disposed on the rear side of the assumed listening position, the headrest may be an obstacle, and the sound may be collected directly by the microphone. Often times it is not possible. Under such a measurement environment, it is difficult to perform accurate time alignment correction.

  For this reason, there is an urgent need for a technique that can easily perform accurate time alignment correction for audio output from all speakers. Meeting this requirement is one of the problems to be solved by the present invention.

  The present invention has been made in view of the above circumstances, and a new acoustic apparatus and delay measurement capable of easily and accurately measuring a propagation delay time of sound from each of a plurality of speakers to an assumed listening position. It aims to provide a method.

  The invention according to claim 1 is an acoustic device that outputs sound from a plurality of speakers to a sound field space, and has a predetermined positional relationship with an assumed listening position in the sound field space. Sound collecting means for collecting sound that has been placed at a specific position and that has been output from each of the plurality of speakers, and that has reached the specific position; and sequentially outputs test sound from each of the plurality of speakers A test sound output means for causing the first sound estimation means to estimate a distance from the specific position to each of the plurality of speakers based on a sound collection result of the test sound by the sound collection means; Second estimation means for estimating a distance from each of the plurality of speakers to the assumed listening position on the basis of the estimation result obtained by the method and the predetermined positional relationship. An acoustic device according to claim.

  According to a tenth aspect of the present invention, there is provided a test sound output step of sequentially outputting test sounds from each of a plurality of speakers; a collection of the test sounds at a specific position having a predetermined positional relationship with an assumed listening position in the sound field space. A first estimation step of estimating a distance from the specific position to each of the plurality of speakers based on a sound result; and a estimation result of the first estimation step and the predetermined positional relationship of the plurality of speakers. A second estimating step of estimating a distance from each of the assumed listening positions; and estimating a propagation delay time of sound from each of the plurality of speakers to the assumed listening position based on an estimation result in the second estimating step. A delay time estimation step. The delay measurement method comprising:

  An eleventh aspect of the invention is a delay measurement program that causes a calculation means to execute the delay measurement method according to the tenth aspect.

  A twelfth aspect of the present invention is a recording medium on which the delay measurement program according to the eleventh aspect is recorded so as to be readable by the arithmetic means.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In the following description, the same or equivalent elements are denoted by the same reference numerals, and redundant description is omitted.

[First Embodiment]
First, a first embodiment of the present invention will be described with reference to FIGS. In the first embodiment, an acoustic device mounted on a vehicle CR (see FIG. 2) will be described as an example.

<Configuration>
FIG. 1 is a block diagram illustrating a schematic configuration of the acoustic device 100A according to the first embodiment.

  As shown in FIG. 1, the acoustic device 100A includes a control unit 110A and a drive unit 120.

The acoustic device 100A includes a sound output unit 130 _L, and the sound output unit 130 _R, the sound output unit 130 _SL, and a sound output unit 130 _SR.

Here, the sound output unit 130 _L includes a left speaker 131 _L (hereinafter also referred to as “L speaker”), and the sound output unit 130 _R includes a right speaker 131 _R (hereinafter also referred to as “R speaker”). ing. The sound output unit 130 _SL has a surround left speaker 131 _SL (hereinafter also referred to as “SL speaker”), and the sound output unit 130 _SR has a surround right speaker 131 _SR (hereinafter also referred to as “SR speaker”). is doing.

  Furthermore, the acoustic device 100A includes a sound collecting unit 140 as sound collecting means, a display unit 150, and an operation input unit 160.

  The elements 120 to 160 other than the control unit 110A are connected to the control unit 110A.

  The control unit 110A performs overall control of the entire sound device 100A. Details of the control unit 110A will be described later.

  When the compact disc CD on which the audio content is recorded is inserted, the drive unit 120 reports that fact to the control unit 110A. When the drive unit 120 receives the audio content reproduction command DVC from the control unit 110A in a state where the compact disc CD is inserted, the drive unit 120 reads the audio designated for reproduction from the compact disc CD. The result of reading out the audio content is sent to the control unit 110A as content data CTD that is an audio signal.

Each of the sound output unit 130 _L to 130 DEG _SR, in addition to the speaker 131 _L to 131 _SR mentioned above, and an amplifier for amplifying an audio output signal AOS _L ~AOS _SR received from the control unit 110A. These sound output units 130 _{L to} 130 _SR reproduce and output test audio signals, music pieces, and the like under the control of the control unit 110A.

In the first embodiment, as shown in FIG. 2, the L speaker 131 _L of the sound output unit 130 _L is disposed in the front door housing on the passenger seat side. The L speaker 131 _L is disposed so as to face the passenger seat side.

The R speaker 131 _R of the sound output unit 130 _R is disposed in the front door housing on the driver's seat side. The R speaker 131 _R is disposed so as to face the driver's seat side.

The SL speaker 131 _SL of the sound output unit 130 _SL is disposed in a housing on the rear side of the passenger seat. The SL speaker 131 _SL is arranged so as to face the rear seat on the passenger seat side.

The SR speaker 131 _SR of the sound output unit 130 _SR is arranged in the housing on the driver seat side rear part. The SR speaker 131 _SR is arranged to face the rear seat on the driver's seat side.

  Returning to FIG. 1, the sound collection unit 140 includes (i) a microphone 141 that collects ambient sounds to be an electrical analog audio signal, (ii) an amplifier that amplifies the analog audio signal output from the microphone, (iii) ) An AD converter (Analog to Digital Converter) that converts the amplified analog audio signal into a digital audio signal. The sound collection result by the sound collection unit 140 is reported to the control unit 110A as sound collection result data AAD.

The microphone 141 of the sound collection unit 140 is disposed at a predetermined sound collection position P2 during the operation of a “delay time setting mode” described later. The sound collection position P2 is set so as to have a predetermined positional relationship with the assumed listening position P1 assumed as the listening position of the listener. In the first embodiment, the assumed listening position P1 is a position that is estimated to be the center position between both ears when the listener is seated in the driver's seat, as shown in FIG. Further, the sound collection position P2 is a position where direct sound from each of the speakers 131 _{L to} 131 _SR can be reached without an obstacle such as a seat.

Here, the positional relationship among the speakers 131 _L to 131 _SR , the assumed listening position P1, and the sound collection position P2 assumed in the first embodiment will be described with reference to FIGS.

As shown in FIG. 3, the speaker 131 _j (j = L to SR) has a length LL along the traveling direction of the vehicle CR and a length WID along the direction orthogonal to the traveling direction of the vehicle CR (hereinafter, “ It is arranged at each vertex of a rectangle of “installation width WID”. Then, through the midpoint of a line connecting the speaker 131 _R as speakers 131 _L and the second speaker as the first speaker, the sound collecting position P2 is set on a straight line perpendicular to the line segment.

Here, the distance between the line segment and the sound collection position P2 is a length FL (hereinafter also referred to as “distance FL”). Further, the distance between the straight line connecting speaker 131 _SL and speaker 131 _SR and sound collection position P2 is length RL (= LL−FL; hereinafter also referred to as “distance RL”).

  For acoustic device 100A, at the time of starting the operation of “delay time setting mode”, set width WID and distances FL and RL are unknown values.

  The sound collection position P2 is separated from the assumed listening position P1 by a distance d along the direction opposite to the traveling direction, and only a distance (WID / 4) toward the passenger seat along the direction orthogonal to the traveling direction. is seperated. Here, the distance d is (1/2) of the thickness of the head in a normal person, and is a value that can be accurately determined in advance.

  The positional relationship assumed in the first embodiment is a highly accurate positional relationship regardless of the vehicle type.

Therefore, as shown in FIG. 4, when the distance from the sound collection position P2 to each of the speakers 131 _j (j = L to SR) is MDS _j , the distance MDS _j is the positional relationship of FIG. Is represented by the following equations (1) to (4).
MDS _L = [(WID / 2) ² + FL ² ] ^1/2 (1)
MDS _R = [(WID / 2) ² + FL ² ] ^1/2 (2)
MDS _SL = [(WID / 2) ² + RL ² ] ^1/2 (3)
MDS _SR = [(WID / 2) ² + RL ² ] ^1/2 (4)

Here, each of the distances MDS _j is a measurable value obtained by measuring the propagation delay time of the sound from the speaker 131 _j to the sound collection position P2. When such a measured value is used, the distance FL can be expressed as the following equation (5) or (6).
FL = [MDS _L ² − (WID / 2) ² ] ^1/2 (5)
FL = [MDS _R ² − (WID / 2) ² ] ^1/2 (6)

Further, the distance RL can be expressed as the following equation (7) or (8).
RL = [MDS _SL ² − (WID / 2) ² ] ^1/2 (7)
RL = [MDS _SR ² − (WID / 2) ² ] ^1/2 (8)

Further, the sine value (sin θ) of the angle θ formed by the line segment connecting the speaker 131 _L and the speaker 131 _R and the line segment connecting the sound collection position P2 and the speaker 131 _R is expressed by the following equation (9). Is done.
sin θ = FL / MDS _R
= [MDS _R ^2- (WID / 2) ² ] ^1/2 / MDS _R (9)

Incidentally, as shown in FIG. 5, when the distance from the assumed listening position P1 to each of the speakers 131 _j (j = L to SR) is HDS _j , the distance HDS _j is equal to the positional relationship of FIG. Originally, it is represented by the following equations (10) to (13).
HDS _L = [(FL−d) ² + (3 × WID / 4) ² ] ^1/2 (10)
HDS _R = [(FL−d) ² + (WID / 4) ² ] ^1/2 (11)
HDS _SL = [(RL + d) ² + (3 × WID / 4) ² ] ^1/2 (12)
HDS _SR = [(RL + d) ² + (WID / 4) ² ] ^1/2 (13)

For this reason, when considering the relationship of the expressions (5) to (8) with respect to the distances FL and RL in the expressions (10) to (13), the distance HDS _j is equal to the distance MDS _j if the installation width WID can be known. It can be calculated using the measured value.

By the way, although the installation width WID is a value determined by the vehicle type, according to the knowledge obtained as a result of the research by the inventor, the value R (= R) of the distance MDS _R and the distance MDS _SR without knowing the vehicle type. (MDS _R / MDS _SR ) can be estimated with high accuracy. An example of the correspondence between the value R and the installation width WID obtained empirically is shown in FIG.

  Returning to FIG. 1, the display unit 150 includes (i) a display device 151 such as a liquid crystal display panel, an organic EL (Electro Luminescence) panel, a PDP (Plasma Display Panel), and (ii) display control sent from the control unit 110A. A display controller such as a graphic renderer that controls the entire display unit 150 based on the data, and (iii) a display image memory that stores display image data are included. The display unit 150 displays operation guidance information and the like under the control of the control unit 110A.

  The operation input unit 160 includes a key unit provided in the main body of the acoustic device 100A, or a remote input device including the key unit. Here, a touch panel provided on the display device 151 of the display unit 150 can be used as the key part provided on the main body. In addition, it can replace with the structure which has a key part, and the structure which inputs voice can also be employ | adopted.

  When the user operates the operation input unit 160, the operation content of the acoustic device 100A is set. For example, the user performs a delay time setting command between speakers, a playback command for audio content, and the like using the operation input unit 160. Such input contents are sent as operation input data IPD from the operation input unit 160 to the control unit 110A.

  As described above, the control unit 110A performs overall control of the acoustic device 100A. As shown in FIG. 7, the control unit 110A includes a control processing unit 111A, a channel signal processing unit 112A as an adjustment unit, and an output signal selection unit 113A. In addition, the control unit 110A includes an analog conversion unit 114A and a volume adjustment unit 115A. Further, the control unit 110A includes a test signal generator 116 as a test sound output unit.

  Based on the command input input to the operation input unit 160 and the sound collection result by the sound collection unit 140, the control processing unit 111A has a channel signal processing unit 112A, an output signal selection unit 113A, a volume adjustment unit 115A, and a test signal generation unit. 116 is controlled. The control processing unit 111A controls the drive unit 120 and the display unit 150. Details of the control processing unit 111A will be described later.

The channel signal processing unit 112A processes the content data CTD sent from the drive unit 120, and adjusts the audio output timing between the speakers 131 _{L to} 131 _SR when reproducing the audio content. As shown in FIG. 8, the channel signal processing unit 112A includes a channel separation unit 210A and a signal delay unit 220A as delay means.

The channel separation unit 210A receives the content data CTD from the drive unit 120. Then, the channel separation unit 210A expands the content data CTD in accordance with the content reproduction control command CSC from the control processing unit 111A, and generates a digital sound data signal that is an audio signal. Subsequently, the channel separation unit 210A analyzes the generated digital sound data signal, and converts the digital sound data signal into the above-described speakers 131 _L , 131 _R , 131 _SL , 131 according to the channel designation information included in the digital sound data signal. Separated to be supplied to each _SR . The signals separated in this way are sent to the signal delay unit 220A as separated channel signals SCD _L , SCD _R , SCD _SL and SCD _SR .

The signal delay unit 220A delays the separated channel signals SCD _{L to} SCD _SR sent from the channel separation unit 210A by a predetermined time in accordance with the delay control command DLC from the control processing unit 111A. As shown in FIG. 9, the signal delay unit 220A having such a function includes four delay units 221 _{L to} 221 _SR .

Each delayer 221 _L to 221 _SR, only the delay time DL _L through DL _SR specified by the individual delay control command DLC _L ~DLC _SR in the delay control command DLC, delaying the separation channel signal SCD _L ~SCD _SR. The delay results are sent to the output signal selection unit 113A as channel processing signals PCD _{L to} PCD _SR .

Returning to FIG. 7, the output signal selection unit 113A receives the channel processing signals PCD _{L to} PCD _SR from the signal delay unit 220A and the test audio signal SGD described later from the test signal generation unit 116. Then, the output signal selection unit 113A supplies the channel processing signals PCD _{L to} PCD _SR , supplies the test audio signal SGD to the analog conversion unit 114A according to the output signal selection command ODS from the control processing unit 111A, and , It is selected whether neither signal is supplied. The output signal selection unit 113A having such a function includes four switch elements 113 _{L to} 113 _SR as shown in FIG.

Each of the switch elements 113 _{L to} 113 _SR has an A terminal and a B terminal as input terminals and a C terminal as an output terminal. The terminal A is a terminal connected to the signal delay unit 220A, and the terminal B is a terminal connected to the test signal generation unit 116. A terminal C is a terminal connected to the analog conversion unit 114A. Each switch element 113 _{L to} 113 _SR receives the channel processing signals PCD _{L to} PCD _SR at the A terminal and receives the test audio signal SGD at the B terminal. Then, according to the individual output selection commands ODS _{L to} ODS _SR in the output signal selection command ODS from the control processing unit 111A, the A terminal and the C terminal are made conductive, the B terminal and the C terminal are made conductive, Either the terminal or the B terminal does not conduct the C terminal. From the C terminals of the switch elements 113 _{L to} 113 _SR , selected signals (including no signal) are sent to the analog conversion unit 114A as sound output selection signals PBD _{L to} PBD _SR .

Returning to FIG. 7, the analog conversion unit 114A converts the sound output selection signals PBD _{L to} PBD _SR , which are digital signals sent from the output signal selection unit 113A, into analog signals. The analog conversion unit 114A includes four DA (Digital to Analogue) converters configured similarly to each other corresponding to the four types of digital signals. Analog signals PBS _{L to} PBS _SR , which are conversion results by the analog conversion unit 114A, are sent to the volume adjustment unit 115A.

Volume adjustment unit 115A receives analog signals PBS _{L to} PBS _SR from analog conversion unit 114A. Then, the volume adjustment unit 115A adjusts the volume for each of the analog signals PBS _{L to} PBS _SR according to the volume adjustment command VLC from the control processing unit 111A. The adjustment result is output to the sound output units 130 _{L to} 130 _SR as audio output signals AOS _{L to} AOS _SR .

  When the test signal generator 116 receives a test sound signal generation command SGC including speaker designation from the control processor 111A, the test signal generator 116 generates a test sound signal SGD. The test audio signal SGD generated in this way is sent to the output signal selection unit 113A.

  The control processing unit 111A exerts the function of the acoustic device 100A while controlling the other components described above. As shown in FIG. 11, the control processing unit 111A includes a first estimation unit 251A as a first estimation unit, an installation width estimation unit 252A as an installation width estimation unit, and a second estimation as a second estimation unit. Part 253A. In addition, the control processing unit 111A includes a control unit 254A as a delay control unit.

Based on the sound collection result data AAD from the sound collection unit 140, the first estimation unit 251A determines the speakers 131 _L to 131 _SR from the sound collection position P2 that is the installation position of the microphone 141 under the control of the control unit 254A. The distances MDS _{L to} MDS _SR (see FIG. 4) are estimated. The estimation of the distances MDS _{L to} MDS _SR by the first estimation unit 251A is started in response to the estimation start command DMC from the control unit 254A.

  First, when the first estimation unit 251A receives the test sound signal generation command SGC including the first measurement target speaker designation from the control unit 254A, the first estimation unit 251A temporarily stores the time TR at which the command is received and collects the sound. Collection of result data AAD is started. Then, the first estimating unit 251A analyzes the sound collection result data AAD, and temporarily stores the time TP when the test sound output from the first measurement target speaker reaches the microphone 141. .

  The first estimating unit 251A converts a value obtained by subtracting the time TR from the time TP (TP-TR) into a distance, and stores the conversion result as a distance from the microphone 141 to the first measurement target speaker. Thereafter, the first estimation unit 251A sends a report MDR to the control unit 254A indicating that the processing related to the speaker that is the first measurement target is completed.

  Subsequently, when the first estimation unit 251A receives the test sound signal generation command SGC including the speaker designation of the next measurement target from the control unit 254A, the first estimation unit 251A performs the same processing as described above and receives the next measurement target from the microphone 141. Estimate and store the distance to the current speaker. Thereafter, the first estimation unit 251A performs the same processing as described above until the distance estimation with respect to the microphone 141 for all the speakers is completed.

When the distance estimation with respect to all the speakers with respect to the microphone 141 is completed, the first estimation unit 251A sets the distance from the microphone 141 to each of the speakers as the first distance MDS (that is, the distance MDS _{L to} MDS _SR ). While sending to the estimation part 252A, it sends toward the 2nd estimation part 253A. In the first embodiment, only the distances MDS _R and MDS _{SR of} the first distance MDS are sent to the installation width estimation unit 252A.

The installation width estimation unit 252A includes an installation width table 259 in which the relationship between the value R and the installation width WID shown in FIG. 6 described above is registered. The installation width estimation unit 252A receives the first distance MDS from the first estimation unit 251A. Subsequently, in the first embodiment, the installation width estimation unit 252A calculates a value R (= MDS _R / MDS _SR ) based on the distances MDS _R and MDS _SR . Then, the installation width estimation unit 252A estimates the installation width WID corresponding to the value R with reference to the installation width table 259. The installation width WID thus estimated is sent toward the second estimation unit 253A.

The second estimation unit 253A receives the first distance MDS from the first estimation unit 251A and the installation width WID from the installation width estimation unit 252A. Then, the second estimation unit 253A estimates the distances HDS _{L to} HDS _SR (see FIG. 5) from the assumed listening position P1 to each of the speakers 131 _L to 131 _SR based on the first distance MDS and the installation width WID. .

The estimation of the distances HDS _L to HDS _SR uses the received first distance MDS and installation width WID, and considers the above-described relationships (10) to (13) in consideration of the relationships of the expressions (5) to (8). ) Is performed by performing calculation according to the equation. The distances HDS _{L to} HDS _SR estimated in this way are sent to the control unit 254A as the second distance HDS.

  The control unit 254A controls the operation of two modes of “reproduction mode” and “delay time setting mode” in the audio device 100A. Here, the “playback mode” is a mode in which audio content is read from the compact disc CD and an audio signal is played back. In addition, the “delay time setting mode” refers to the generation of the test audio signal SGD, measurement, and the delay time corresponding to each speaker in order to correct the time alignment of the audio output timing from each of the sound output units. This is the mode to set.

  The control unit 254A analyzes the operation input data IPD received from the operation input unit 160, and performs operation control of either “reproduction mode” or “delay time setting mode”. More specifically, the control unit 254A normally controls the operation of the “reproduction mode”. On the other hand, upon receiving a delay time setting command from the operation input unit 160, the control unit 254A controls the operation of the “delay time setting mode”. When the control of the “delay time setting mode” operation ends, the control unit 254A returns to the operation control of the “reproduction mode”.

In controlling the operation of the “delay time setting mode”, the control unit 254A controls the delay time measurement for each of the sound output units 130 _{L to} 130 _SR .

  In controlling the delay time measurement, the control unit 254A first sends a command to the output signal selection unit 113A to select the test audio signal SGD. More specifically, the B terminal and the C terminal of the switch element corresponding to the first measurement target speaker in the output signal selection unit 113A are electrically connected, and the C terminals of the other switch elements are connected to the A terminal and the B terminal. An output signal selection command ODS designating that neither of them is conducted is sent to the output signal selection unit 113A.

  Subsequently, the control unit 254A sends a test voice signal generation command SGC to the effect that the test voice signal SGD should be generated to the test signal generation unit 116 and to the first estimation unit 251A.

  When the control unit 254A receives from the first estimation unit 251A the report MDR that the estimation of the distance between the speaker that is the first measurement target and the microphone 141 is completed, the sound output unit that is the next measurement target Settings related to are made. More specifically, the B terminal and the C terminal of the switch element corresponding to the sound output unit to be measured next are conducted, and the C terminal of the other switch element is not conducted to either the A terminal or the B terminal. An output signal selection command ODS that designates this is sent to the output signal selection unit 113A. Subsequently, similarly to the delay time measurement operation for the first measurement target speaker, the control unit 254A directs the test audio signal generation command SGC to the test signal generation unit 116 to generate the test audio signal SGD. send.

  Thereafter, the control unit 254A performs the same control as described above on the output signal selection unit 113A, the test signal generation unit 116, and the first estimation unit 251A until distance estimation with respect to the microphones 141 regarding all speakers is completed. .

In addition, when receiving the second distance HDS from the second estimating unit 253A, the control unit 254A converts the distances HDS _L , HDRS _R , HDS _SL , and HDS _SR included therein into time. Then, calculate the delay time DL _L through DL _SR of the audio output signal AOS _L ~AOS _SR supplied to each audio output unit 130 _L to 130 DEG _SL. Then, the control unit 254A stores the calculation result inside and sends the calculation result to the signal delay unit 220A as a delay control command DLC.

  Thus, when the delay time is set in the signal delay unit 220A, the control unit 254A ends the operation control of the “delay time setting mode”.

In the operation control of the “reproduction mode”, the control unit 254A instructs the output signal selection unit 113A to specify that the A terminal and the C terminal should be made conductive for all of the switch elements 113 _{L to} 113 _SR. Send selection command ODS. As a result, the channel processing signals PCD _{L to} PCD _SR from the signal delay unit 220A are supplied to the analog conversion unit 114A as the sound output selection signals PBD _{L to} PBD _SR via the output signal selection unit 113A. become.

  In addition, the control unit 254A causes the display unit 150 to display a guidance screen for assisting the user in specifying the audio content to be played back when controlling the operation of the “playback mode”. Then, when a reproduction command designating audio content is input from the operation input unit 160, the control unit 254A controls the drive unit 120 to control data reading of the reproduction content.

Further, the control unit 254A controls the channel separation unit 210A to separate the content data CTD into the separated channel signals SCD _{L to} SCD _SR when controlling the operation in the “playback mode”.

The control unit 254A, upon operation control of the "reproduction mode", and controls the volume control unit 115A, adjust the output volume Kara speaker 131 _L to 131 _SR sound output unit 130 _L to 130 DEG _SR. When controlling the output sound volume, the control unit 254A generates a sound volume adjustment command VLC based on the sound volume designation input from the operation input unit 160 and the noise level obtained from the sound collection result by the sound collection unit 140, thereby adjusting the sound volume. Send to part 115A.

<Operation>
Next, the operation of the acoustic device 100A configured as described above will be described mainly focusing on the operation in the “delay time setting mode”.

  When the user inputs a delay time setting command to the operation input unit 160, the operation of the “delay time setting mode” of the acoustic device 100A starts. Thus, when the operation of the “delay time setting mode” starts, first, in step S11 of FIG. 12, the speaker to be measured first is selected.

In the first embodiment, the control unit 254A of the control processing unit 111A includes, as a speaker serving as a first measured, for example, to select the L speaker 131 _L. Then, the control unit 254A performs the setting processing of the signal paths for the distance measurement between the microphone 141 about L speaker 131 _L. In setting processing of the signal paths in the step S11, the control unit 254A, along with to conduct the B and C terminals of the switch element 113 _L of the output signal selecting section 113A, the C terminal of the other switch elements 113 _R to 113 _SR An output signal selection command ODS that specifies that neither the A terminal nor the B terminal is conducted is issued to the output signal selection unit 113A (see FIG. 10).

  After the above signal path setting is completed, the control unit 254A issues an estimation start command DMC to the first estimation unit 251A of the control processing unit 111A.

Next, in step S12, the control unit 254A sends a test signal generation command SGC indicating that the test audio signal SGD should be generated to the test signal generation unit 116 and to the first estimation unit 251A. Upon receiving the test signal generation command SGC, the test signal generation unit 116 generates a test audio signal SGD. As a result, the test sound is output from the L speaker 131 _L via the output signal selection unit 113A, the analog conversion unit 114A, and the volume adjustment unit 115A. The first estimating unit 251A that has received the test signal generation command SGC temporarily stores the time TR at which the command is received and starts collecting the sound collection result data AAD.

Next, in step S13, the first estimation unit 251A performs a process of estimating the distance MDS _L from the sound collection position P2 to the L speaker 131 _L. During the estimation process of the distance MDS _L , the first estimation unit 251A analyzes the sound collection result data AAD and stores the time TP when the test sound output from the L speaker 131 _L reaches the microphone 141. Then, the first estimation unit 251A converts a value obtained by subtracting the time TR from the time TP (TP-TR) into a distance, and sets the conversion result as a distance MDS _L from the microphone 141 to the L speaker 131 _L. Store in 251A. Thereafter, the first estimation unit 251A sends a report MDR to the control unit 254A indicating that the processing related to the L speaker 131 _L has been completed, and the processing in step S13 ends.

Then, in step S14, the control unit 254A determines whether the distance measured for all of the speakers 131 _L to 131 _SR was completed. If the result of this determination is negative (step S14: N), the process proceeds to step S15.

In step S15, setting processing of the signal path for distance measurements for the next measurement object such as R loudspeaker 131 _R is performed. In setting processing of the signal path in step S15, the control unit 254A, along with to conduct the B and C terminals of the switch element 113 _R of the output signal selecting section 113A, the other switch elements 113 _L, of 113 _SL, 113 _SR An output signal selection command ODS designating that the C terminal does not conduct with either the A terminal or the B terminal is issued to the output signal selection unit 113A.

  When the process of step S15 ends, the process returns to step S12. Thereafter, the processes in steps S12 to S15 are repeated until the result of the determination in step S14 becomes affirmative.

When the distance measurement for all the speakers 130 _{L to} 130 _SR is completed and the result of determination in step S14 is affirmative (step S14: Y), the first estimation unit 251A determines the distance from the microphone 141 to each of the speakers. Is sent as the first distance MDS to the installation width estimation unit 252A and to the second estimation unit 253A. Thereafter, the process proceeds to step S16.

In step S16, a delay time measurement process is performed. In this delay time measurement process, as shown in FIG. 13, first, in step S21, the installation width estimation unit 252A determines the acoustic device 100A from the relationship between the distance MDS _R and the distance MDS _SR included in the first distance MDS. Is estimated, and an installation width WID that is an installation interval between the L speaker 131 _L and the R speaker 131 _R is estimated from the estimated vehicle shape. The installation width WID thus estimated is sent toward the second estimation unit 253A. Then, the process of step S21 is complete | finished.

Next, in step S22, the second estimation unit 253A estimates the distances HDS _{L to} HDS _SR (see FIG. 5) from the assumed listening position P1 to the speakers 131 _L to 131 _SR , respectively. In estimating the distance, the second estimation unit 253A performs calculation according to the above-described equations (10) to (13) using the first distance MDS and the installation width WID. The distances HDS _{L to} HDS _SR calculated in this way are sent to the control unit 254A as the second distance HDS. Thereafter, the process proceeds to step S23.

In step S23, the control unit 254A that has received the second distance HDS converts the distances HDS _L , HDS _R , HDS _SL , and HDS _SR included in the second distance HDS into time. After the conversion, when the process of step S23 ends, the process of step S16 ends, and the process proceeds to step S17 of FIG.

In step S17, the control unit 254A, the sound output unit 130 _L to 131 analyzes the delay measurement results for _SR, the delay time of the audio output signal AOS _L ~AOS _SR supplied to each audio output unit 130 _L to 130 DEG _SR DL _{L to} DL _SR are calculated. Then, the control unit 254A stores the calculation result inside and sends the calculation result to the signal delay unit 220A as a delay control command DLC.

Thus, when the process of step S17 is completed, the control unit 254A outputs to the output signal selection unit 113A designating that the A terminal and the C terminal should be made conductive for all of the switch elements 113 _{L to} 113 _SR. Send signal selection command ODS. As a result, the channel processing signals PCD _{L to} PCD _SR sent from the signal delay unit 220A are supplied to the analog conversion unit 114A as the sound output selection signals PBD _{L to} PBD _SR via the output signal selection unit 113A. Will come to be. Thus, when the “delay time setting mode” ends, the acoustic device 100A resumes the operation of the “reproduction mode”.

  In the “playback mode”, the control unit 254A causes the display unit 150 to display a guidance screen for assisting the user in specifying audio content to be played back. When a reproduction command designating audio content is input to the operation input unit 160, the control unit 254A controls the drive unit 120 to control data reading of the audio content.

In the “playback mode”, the control unit 254A controls the channel separation unit 210A to separate the content data CTD from the drive unit 120 into separated channel signals SCD _{L to} SCD _SR .

The control unit 254A is "reproduction mode" sometimes controls the volume control unit 115A, adjust the output volume of the color of the speaker 131 _L to 131 _SR sound output unit 130 _L to 130 DEG _SR.

  The audio content is reproduced under the control of the control unit 254A in the “reproduction mode” as described above, and the reproduced audio is provided to the listener who is the user of the acoustic device 100A.

As described above, in the first embodiment, the microphone 141 that collects the test sound is disposed at a position that is the midpoint of the line segment that connects the driver seat and the headrest of the passenger seat. Therefore, test sounds output from the four speakers, the L speaker 131 _L , the R speaker 131 _R , the SL speaker 131 _SL , and the SR speaker 131 _SR , are directly collected by the microphone 141. For this reason, in the time alignment correction, measurement using the direct sound of the test sound can be performed for all the speakers 131 _{L to} 131 _SR .

In the first embodiment, in the installation width estimation unit 252A, the shape of the vehicle on which the acoustic device 100A is mounted is estimated from the relationship between the distance MDS _L and the distance MDS _SL, and the estimated shape of the vehicle is used. It is estimated from the installation width WID that is the installation interval between the L speaker 131 _L and the R speaker 131 _R. Then, the second estimation unit 253A calculates the second distance HDS from the first distance MDS using the installation width WID. In general, in order to obtain the second distance from the first distance MDS in the vehicle CR, a set value such as the shape of the vehicle needs to be known. However, in the first embodiment, since the installation width WID is estimated as described above, by setting only the positional relationship between the installation position P2 of the microphone 141 and the assumed listening position P1 as a predetermined positional relationship, Time alignment correction can be performed accurately without examining the shape or the like.

  Therefore, according to the first embodiment, when appreciating music or the like, it is possible to easily perform appropriate audio delay correction corresponding to the audio propagation delay time.

[Second Embodiment]
Next, a second embodiment of the present invention will be described with reference to FIGS. 14 to 23 and other drawings as appropriate. The second embodiment will also be described by exemplifying an acoustic device mounted on the vehicle CR (see FIG. 15), similarly to the first embodiment described above.

<Configuration>
FIG. 14 is a block diagram illustrating a schematic configuration of the acoustic device 100B according to the second embodiment. Hereinafter, the configuration of the acoustic device 100B will be described mainly focusing on differences from the acoustic device 100A according to the first embodiment.

As shown in FIG. 14, the acoustic apparatus 100B is different from the acoustic devices 100A, control points with a control unit 110B in place of the unit 110A, and that it further includes a sound output unit 130 _C is different.

The sound output unit 130 _C includes a center speaker 131 _C (hereinafter also referred to as “C speaker”) as a third speaker, and an amplifier that amplifies the audio output signal AOS _C received from the control unit 110B. Similar to the sound output units 130 _{L to} 130 _SR , the sound output unit 130 _C reproduces and outputs a test audio signal, music, and the like under the control of the control unit 110B.

In the second embodiment, as shown in FIG. 15, C speaker 131 _C of the sound output unit 130 _C has the line connecting the L speaker 131 _L and R speakers 131 _R in the dashboard of the front center portion Located at the midpoint. The C speaker 131 _C is disposed so as to face rearward.

Here, the positional relationship among the speakers 131 _C to 131 _SR , the assumed listening position P1, and the sound collection position P2 assumed in the second embodiment will be described with reference to FIGS.

As shown in FIG. 16, in the second embodiment, the speakers 131 _{L to} 131 _SR are arranged at the same positions as those in the first embodiment. The positional relationship between the assumed listening position P1 and the sound collection position P2 is the same as that in the first embodiment. Further, as shown in FIG. 16, the speaker 131 _C is arranged near the midpoint of the line segment connecting the speaker 131 _L as the first speaker and the speaker 131 _R as the second speaker.

  Note that the positional relationship assumed in the second embodiment is a highly accurate positional relationship regardless of the vehicle type.

Now, as shown in FIG. 17, if the distance from the sound collection position P2 to the respective speakers 131 _{k (k} = C~SR) was MDS _k, the distance of the distance MDS _k MDS _{j (j} = L ~ SR) are represented by the above-described equations (1) to (4), as in the case of the first embodiment. The distance MDS _C is expressed by the following equation (14).
MDS _C = FL (14)

As a result, the sine value (sin θ) of the angle θ formed by the line segment connecting the speaker 131 _L and the speaker 131 _R and the line segment connecting the sound collection position P2 and the speaker 131 _R is expressed by the following equation (15). expressed.
sin θ = MDS _C / MDS _R (15)

The installation width WID is represented by the following equation (16).
WID = 2 × (MDS _R ² −MDS _C ² ) ^1/2 (16)

Therefore, as shown in FIG. 18, when the distance from the assumed listening position P1 to each of the speakers 131 _k (k = C to SR) is HDS _k , the distance HDS _k is the positional relationship of FIG. Is represented by the following equations (17) to (21).
HDS _C = [(FL−d) ² + (WID / 4) ² ] ^1/2 (17)
HDS _L = [(FL−d) ² + (3 × WID / 4) ² ] ^1/2 (18)
HDS _R = [(FL−d) ² + (WID / 4) ² ] ^1/2 (19)
HDS _SL = [(RL + d) ² + (3 × WID / 4) ² ] ^1/2 (20)
HDS _SR = [(RL + d) ² + (WID / 4) ² ] ^1/2 (21)

For this reason, considering the equation (14) for the distance FL in the equations (17) to (21), considering the equation (8) for the distance RL, and further considering the equation (16) for the installation width WID, the distance HDS _j can be calculated using the measured value of the distance MDS _k .

  Returning to FIG. 14, the control unit 110 </ b> B performs overall control of the audio device 100 </ b> B as described above. As shown in FIG. 19, the control unit 110B is provided with a control processing unit 111B instead of the control processing unit 111A as compared with the control unit 110A in the first embodiment, and instead of the channel signal processing unit 112A. The difference is that a channel signal processing unit 112B is provided and an output signal selection unit 113B is provided instead of the output signal selection unit 113A. In addition, the control unit 110B includes an analog conversion unit 114B instead of the analog conversion unit 114A, and a volume adjustment unit 115B instead of the volume adjustment unit 115A, as compared with the control unit 110A according to the first embodiment. Is different.

  Based on the command input input to the operation input unit 160 and the sound collection result by the sound collection unit 140, the control processing unit 111B is provided with a channel signal processing unit 112B, an output signal selection unit 113B, a volume adjustment unit 115B, and a test signal generation unit. 116 is controlled. The control processing unit 111B controls the drive unit 120 and the display unit 150. Details of the control processing unit 111B will be described later.

The channel signal processing unit 112B adjusts the audio output timing between the speakers 131 _{C to} 131 _SR at the time of reproducing the audio content. As shown in FIG. 20, the channel signal processing unit 112B includes a channel separation unit 210B instead of the channel separation unit 210A, as compared with the channel signal processing unit 112A in the first embodiment, and a signal delay unit 220A. Instead, a signal delay unit 220B is provided.

Compared with the channel separation unit 210A in the first embodiment, the channel separation unit 210B applies the digital sound data signal to each of the five speakers including the speakers 131 _L , 131 _R , 131 _SL , and 131 _SR plus the speaker 131 _C. The difference is that the signals are separated as supplied, and the separated channel signals SCD _L , SCD _R , SCD _SL , SCD _SR , and SCD _C are sent to the signal delay unit 220B.

Compared with the signal delay unit 220A in the first embodiment, the signal delay unit 220B further includes a delay unit that delays the separated channel signal SCD _C by a predetermined delay time DL _C in addition to the delay units 221 _{L to} 221 _SR. And channel processing signals PCD _{C to} PCD _SR as delay results are sent to the output signal selection unit 113B.

Returning to FIG. 19, the output signal selection unit 113B, in addition to the switch elements 113 _{L to} 113 _SR , in addition to the output signal selection unit 113A in the first embodiment, includes the channel processing signal PCD _C toward the analog conversion unit 114B. A switch element (hereinafter also referred to as “C-channel switch element”) for selecting the supply, the supply of the test audio signal SGD, and no signal, and the sound output selection signal PBD _C. The difference is that the PBD _SR is sent to the analog converter 114B. The C-channel switch element is configured in the same manner as the switch elements 113 _{L to} 113 _SR .

Compared to the analog conversion unit 114A according to the first embodiment, the analog conversion unit 114B further includes a DA converter that converts the sound output selection signal PBD _C that is a digital signal into an analog signal PBS _C , and the analog signal. The difference is that PBS _{C to} PBS _SR are sent to the volume adjusting unit 115B.

The volume adjustment unit 115B is a point that adjusts the volume of the analog signal PBS _C in addition to the analog signals PBS _{L to} PBS _SR and the adjustment result, as compared with the volume adjustment unit 115A according to the first embodiment. The difference is that the audio output signals AOS _{C to} AOS _SR are sent to the sound output units 130 _{C to} 130 _SR .

  The control processing unit 111B exhibits the function of the acoustic device 100B. As shown in FIG. 21, the control processing unit 111B includes a first estimation unit 251B instead of the first estimation unit 251A and an installation width estimation unit, as compared with the control processing unit 111A in the first embodiment. The point provided with the installation width estimation unit 252B instead of 252A is different from the point provided with the second estimation unit 253B instead of the second estimation unit 253A. Further, the control processing unit 111B is different from the control processing unit 111A according to the first embodiment in that a control unit 254B is provided instead of the control unit 254A.

Compared to the first estimation unit 251A in the first embodiment, the first estimation unit 251B includes the distance MDS _C from the microphone 141 to the speaker 131 _C in addition to the distance from the microphone 141 to each of the speakers 131 _L to 131 _SR. (Refer to FIG. 17) and the distance from the microphone 141 to each of the speakers 131 _C to 131 _SR as the first distance MDS (that is, the distance MDS _{C to} MDS _SR ), and the installation width estimation unit 252B and the first 2 The point which sends toward the estimation part 253B differs. In the second embodiment, only the distances MDS _C and MDS _R out of the first distance MDS are sent to the installation width estimation unit 252B.

The installation width estimation unit 252B receives the first distance MDS from the first estimation unit 251B. In the second embodiment, the installation width estimation unit 252B estimates the installation width WID by performing calculation according to the above-described equation (16) based on the distances MDS _C and MDS _R. The installation width WID thus estimated is sent toward the second estimation unit 253B.

Second estimation unit 253B is different from the second estimating portion 253A according to the first embodiment, in addition to the distance HDS _L ~HDS _SR from assumed listening position P1 to the respective speakers 131 _L to 131 _SR, it assumed listening position The point HDS _C (see FIG. 18) from P1 to the speaker 131 _C is estimated, and the distances HDS _{L to} HDS _SR from the assumed listening position P1 to each of the speakers 131 _C to 131 _SR are defined as the second distance HDS. The difference is that it is sent to the control unit 254B. Here, the estimation of the distances HDS _{C to} HDS _SR was performed using the received first distance MDS and the installation width WID, while considering the relationship of the above-described equations (7), (8), and (14). The calculation is performed according to the equations (17) to (21). The distances HDS _{C to} HDS _SR thus estimated are sent to the control unit 254B as the second distance HDS.

  The control unit 254B controls the operation of the two modes of “reproduction mode” and “delay time setting mode” in the audio device 100B.

When controlling the operation of the “delay time setting mode”, the control unit 254B, in addition to the control unit 254A according to the first embodiment, in addition to the measurement control of the delay time for each of the sound output units 130 _{L to} 130 _SR , The difference is that the delay time setting control for the sound output unit 130 _C is performed. In this control, the control unit 254B delays each of the sound output units 130 _{C to} 130 _SR toward the output signal selection unit 113B, the first estimation unit 251B, the installation width estimation unit 252B, and the second estimation unit 253B. Time measurement control is performed.

Further, when controlling the operation of the “playback mode”, the control unit 254B is directed from each of the sound output units 130 _{C to} 130 _SR toward the channel signal processing unit 112B, the output signal selection unit 113B, and the volume adjustment unit 115B. Control for outputting the audio sound read from the audio content is performed.

<Operation>
Regarding the operation of the acoustic device 100B configured as described above, the installation width WID estimation operation in the installation width estimation unit 252B and the assumed listening position P1 in the second estimation unit 253B to each of the speakers 131 _C to 131 _SR . A description will be given mainly focusing on the distance estimation operation.

  When the user inputs a delay time setting command to the operation input unit 160, the operation of the “delay time setting mode” of the audio device 100B starts. First, in step S31 in FIG. 22, the speaker to be measured first is selected.

In the second embodiment, the control unit 254B selects, for example, the C speaker 131 _C as the first measurement target speaker. Then, the control unit 254B performs the setting processing of the signal paths for the distance measurement between the microphone 141 about C speaker 131 _C. After the signal path setting is completed, the control unit 254B issues an estimation start command DMC to the first estimation unit 251B.

Next, in step S32, the control unit 254B sends a test signal generation command SGC to the test signal generation unit 116 and the first estimation unit 251B. Upon receiving the test signal generation command SGC, the test signal generation unit 116 generates a test audio signal SGD. As a result, the test sound is output from the C speaker 131 _C via the output signal selection unit 113B, the analog conversion unit 114B, and the volume adjustment unit 115B. Further, the first estimation unit 251B that has received the test signal generation command SGC temporarily stores the time TR at which the command is received and starts collecting the sound collection result data AAD.

Next, in step S33, the first estimating portion 251B analyzes the collected result data AAD, test sound output from the C speaker 131 _C is, stores the time TP when it reaches the microphone 141. Then, the first estimation unit 251B converts a value (TP-TR) obtained by subtracting the time TR from the time TP into a distance, and stores the conversion result as the distance MDS _C in the first estimation unit 251B. Thereafter, the first estimation unit 251B sends a report MDR to the control unit 254B indicating that the processing related to the C speaker 131 _C has been completed.

Then, in step S34, the control unit 254B determines whether the distance measured for all of the speakers 131 _C to 131 _SR was completed. If the result of this determination is negative (step S34: N), the process proceeds to step S35.

In step S35, setting processing of the signal path for distance measurements for the next measurement object e.g. L speaker 131 _L is performed in the same manner as in the first embodiment.

  When the process of step S35 ends, the process returns to step S32. Thereafter, the processes in steps S32 to S35 are repeated until the result of the determination in step S34 becomes affirmative.

When the distance measurement for all the speakers 130 _{C to} 130 _SR is completed and the determination result in step S34 is affirmative (step S34: Y), the first estimation unit 251B determines the distance from the microphone 141 to each speaker. Is sent to the installation width estimation unit 252B and the second estimation unit 253B as the first distance MDS. Thereafter, the process proceeds to step S36.

In step S36, a delay time measurement process is performed. In this delay time measurement process, as shown in FIG. 23, first, in step S41, the installation width estimation unit 252B performs the distance MDS _C and the distance MDS _R included in the first distance MDS, the microphone 141, and the C speaker 131. _From the arrangement relationship between _C and the R speaker 131 _R , the installation width WID that is the installation interval between the L speaker 131 _L and the R speaker 131 _R is estimated according to the equation (16). The estimated installation width WID is sent toward the second estimation unit 253B, and then the process of step S41 ends.

Next, in step S42, the second estimating portion 253B estimates the distance HDS _C ~HDS _SR from assumed listening position P1 to the respective speakers 131 _C to 131 _SR. When estimating the distance, the second estimation unit 253B performs calculation according to the above-described equations (17) to (21) using the received first distance MDS and installation width WID. The distances HDS _{C to} HDS _SR calculated in this way are sent to the control unit 254B as the second distance HDS.

In step S43, the control unit 254B that has received the second distance HDS converts the distances HDS _{C to} HDS _SR included in the second distance HDS into time. Thereafter, the process of step S43 ends, and the process proceeds to step S37 of FIG.

In the step S37, the control unit 254B, the sound output unit 130 _C to 131 analyzes the delay measurement results for _SR, the delay time of the audio output signal AOS _C ~AOS _SR supplied to each audio output unit 130 _C to 130 DEG _SR DL _{C to} DL _SR are calculated. And the control part 254B memorize | stores this calculation result inside, and sends it toward the signal delay part 220B as delay control instruction | command DLC.

When the processing in step S37 is thus completed, the control unit 254B sends an output signal selection command ODS to the effect that the channel processing signals PCD _{C to} PCD _SR are to be selected, to the output signal selection unit 113B. As a result, the channel processing signals PCD _{C to} PCD _SR sent from the signal delay unit 220B are supplied to the analog conversion unit 114B as the sound output selection signals PBD _{C to} PBD _SR via the output signal selection unit 113B. Will come to be. Thus, when the “delay time setting mode” ends, the audio device 100B starts the operation of the “reproduction mode”.

As described above, in the second embodiment, as in the case of the first embodiment, the microphone 141 that collects the test sound is the midpoint of the line segment connecting the headrest of the driver seat and the passenger seat. Is arranged. Therefore, test sounds output from the five speakers, the C speaker 131 _C , the L speaker 131 _L , the R speaker 131 _R , the SL speaker 131 _SL , and the SR speaker 131 _SR , are directly collected by the microphone 141. . For this reason, in the time alignment correction, measurement using the direct sound of the test sound can be performed for all the speakers 131 _{C to} 131 _SR .

In the second embodiment, the installation width estimation unit 252B estimates from the distances MDS _C and MDS _L from the installation width WID that is the installation interval between the L speaker 131 _L and the R speaker 131 _R according to the equation (16). Yes. Then, the second estimation unit 253B calculates the second distance HDS from the first distance MDS using the installation width WID. For this reason, by making only the positional relationship between the installation position P2 of the microphone 141 and the assumed listening position P1 a predetermined positional relationship, it is possible to accurately perform time alignment correction without investigating the shape of the vehicle.

  Therefore, according to the second embodiment, when appreciating music or the like, appropriate audio delay correction corresponding to the audio propagation delay time can be easily performed.

[Modification of Embodiment]
The present invention is not limited to the above-described embodiment, and various modifications are possible.

For example, in the first embodiment, the installation width estimation unit 252A estimates the shape of the vehicle on which the acoustic device 100A is mounted from the relationship between the distance MDS _R and the distance MDS _SR . On the other hand, in the installation width estimation unit 252A, the shape of the vehicle may be estimated from the relationship between the distance MDS _L and the distance MDS _SL, and may be estimated from the installation width WID from the estimation result, or the length FL And RL may be estimated from the relationship between RL and RL, and the installation width WID may be estimated from this estimation result.

In the second embodiment, the installation width estimation unit 252B calculates the installation width WID from the distances MDS _C and MDS _R according to the equation (16). On the other hand, the installation width estimation unit 252B may calculate the installation width WID from the distances MDS _C and MDS _{L according} to the following equation (22).
WID = 2 × (MDS _L ² −MDS _C ² ) ^1/2 (22)

In the first embodiment, the four sound output units are provided. However, if the left speaker 131 _L and the right speaker 131 _R are provided, an audio signal as a result of reading out the audio content is appropriately used. It is also possible to separate or mix and output sound from two, three or less, or five or more speakers.

In the second embodiment, the five sound output units are provided. However, if the center speaker 131 _C , the left speaker 131 _L , and the right speaker 131 _R are provided, the result of reading the audio content is A certain audio signal may be appropriately separated or mixed, and sound may be output from 3 or more, 4 or less, or 6 or more speakers.

  In the first and second embodiments, the driver's seat is assumed as the assumed listening position P1, but the assumed listening position may be a passenger seat. In this case, the user can send the assumed listening position information to the control unit using the operation input unit 160 and set the delay time corresponding to the assumed listening position.

  In the first and second embodiments, one microphone 141 is provided. However, if the positional relationship with the assumed listening position P1 is known, two or more microphones may be provided.

In the first and second embodiments described above, sound collection position P2 passes through the midpoint of a line connecting the loudspeakers 131 _L and the speaker 131 _R, are arranged on a straight line perpendicular to the line segment It was. On the other hand, the sound collection position P2 does not necessarily have to pass through the midpoint of the line segment. In this case, a line passing through P2 and orthogonal to the line segment and the intersection of the line segment If the division ratio of the line is determined in advance, the same processing as in the first and second embodiments can be performed.

  In the first and second embodiments, the drive unit 120 is a CD drive unit. However, the drive unit 120 may be a fixed disk or DVD drive unit. Furthermore, it can be a broadcast wave receiving circuit for radio broadcasting or terrestrial digital television broadcasting, an audio input circuit for an external device, or the like.

  In the first and second embodiments, the present invention is applied to an acoustic device mounted on a vehicle. However, the present invention is also applied to an acoustic device mounted on a moving body other than the vehicle. In addition, for example, the present invention can be applied to an acoustic device installed in a home or the like.

  In addition, a part or all of the control units 110A and 110B in the above-described embodiment are a central processing unit (CPU), a DSP (Digital Signal Processor), a read only memory (ROM), a random access memory. (RAM: Random Access Memory) etc. are configured as a computer as a calculation means, and a part of or all of the processing in the above embodiment is executed by executing a program prepared in advance on the computer. May be. This program is recorded on a computer-readable recording medium such as a hard disk, CD-ROM, or DVD, and is read from the recording medium and executed by the computer. The program may be acquired in a form recorded on a portable recording medium such as a CD-ROM or DVD, or may be acquired in a form of delivery via a network such as the Internet. Also good.

1 is a block diagram schematically showing the configuration of an acoustic device according to a first embodiment of the present invention. It is a figure for demonstrating the arrangement position of four speakers of FIG. 1, the arrangement position (sound collection position) of a microphone, and an assumed listening position. It is a figure for demonstrating the mutual relationship of the arrangement position of the speaker in FIG. 2, the arrangement position of a microphone, and an assumption listening position. It is a figure for demonstrating the distance from each speaker in FIG. 3 to a sound collection position. It is a figure for demonstrating the distance from each speaker in FIG. 3 to an assumed listening position. It is a figure for demonstrating the response | compatibility with the mutual relationship of the arrangement position of the speaker in FIG. 3, and installation width. It is a block diagram for demonstrating the structure of the control unit of FIG. It is a block diagram for demonstrating the structure of the channel signal processing part of FIG. It is a block diagram for demonstrating the structure of the signal delay part of FIG. It is a block diagram for demonstrating the structure of the output signal selection part of FIG. It is a block diagram for demonstrating the structure of the control process part of FIG. It is a flowchart for demonstrating the delay time setting process by the apparatus of FIG. It is a flowchart for demonstrating the delay time measurement process in FIG. It is a block diagram which shows roughly the structure of the audio equipment concerning 2nd Embodiment of this invention. It is a figure for demonstrating the arrangement position of five speakers of FIG. 14, the arrangement position (sound collection position) of a microphone, and an assumed listening position. It is a figure for demonstrating the mutual relationship of the arrangement position of the speaker in FIG. 15, the arrangement position of a microphone, and an assumption listening position. It is a figure for demonstrating the distance from each speaker in FIG. 16 to a sound collection position. It is a figure for demonstrating the distance from each speaker in FIG. 16 to a presumed listening position. It is a block diagram for demonstrating the structure of the control unit of FIG. It is a block diagram for demonstrating the structure of the channel signal processing part of FIG. It is a block diagram for demonstrating the structure of the control process part of FIG. It is a flowchart for demonstrating the delay time setting process by the apparatus of FIG. It is a flowchart for demonstrating the delay time measurement process in FIG.

Explanation of symbols

100A, 100B ... Acoustic device 112A, 112B ... Channel signal processing unit (adjustment means)
116: Test signal generator (test voice output means)
131 _{C to} 131 _SR … Speaker 140… Sound collecting unit (sound collecting means)
220A, 220B ... Signal delay unit (delay means)
251A, 251B ... 1st estimation part (1st estimation means)
252A, 252B ... Installation width estimation unit (installation width estimation means)
253A, 253B ... 2nd estimation part (2nd estimation means)
254A, 254B ... Control unit (delay control means)

Claims (12)

An audio device for outputting audio content reproduction results from a plurality of speakers toward a sound field space,
Sound collecting means that is arranged at a specific position having a predetermined positional relationship with the assumed listening position in the sound field space, and that collects the sound that has reached the specific position after the sound is output from each of the plurality of speakers. When;
Test audio output means for sequentially outputting test audio from each of the plurality of speakers;
First estimation means for estimating a distance from the specific position to each of the plurality of speakers based on a sound collection result of the test sound by the sound collection means;
Second estimation means for estimating a distance from each of the plurality of speakers to the assumed listening position based on an estimation result by the first estimation means and the predetermined positional relationship;
An acoustic device comprising:   The acoustic device according to claim 1, wherein the specific position is a position where sound output from all of the plurality of speakers can be directly reached. The plurality of speakers includes a first speaker and a second speaker,
The specific position is a position estimated to be on a straight line passing through a midpoint of a line segment connecting the first speaker and the second speaker and orthogonal to the line segment. The acoustic device according to claim 1 or 2. The plurality of speakers includes a third speaker installed at a position where the distance from the straight line is substantially the same as the distance from the straight line to the first speaker, and the distance from the straight line from the straight line to the first speaker. At least one of the fourth speakers installed at substantially the same position as the distance to the second speaker;
A first correlation between a distance estimation result by the first estimation unit for the first speaker and a distance estimation result by the first estimation unit for the third speaker, and a distance by the first estimation unit for the second speaker Installation width estimation means for estimating the length of the line segment based on at least one of the second correlations between the estimation result and the distance estimation result by the first estimation means regarding the fourth speaker;
The acoustic device according to claim 3, further comprising: The plurality of speakers include a third speaker installed near the midpoint of the line segment;
An installation width estimating means for estimating a length of the line segment based on a distance estimation result by the first estimating means for each of the first speaker, the second speaker, and the third speaker;
The acoustic device according to claim 3, further comprising:   The plurality of speakers includes a fourth speaker installed at a position where the distance from the straight line is substantially the same as the distance from the straight line to the first speaker, and the distance from the straight line from the straight line to the first speaker. The acoustic device according to claim 5, further comprising at least one of a fifth speaker installed at a position substantially the same as a distance to the second speaker.   And adjusting means for adjusting audio output timing between the plurality of speakers at the time of reproduction of the audio content based on an estimation result by the second estimation unit regarding each of the plurality of speakers. The acoustic device according to any one of claims 1 to 6. The adjusting means includes
Delay means for providing a delay time for each audio signal derived from the audio content and supplied to each of the plurality of speakers;
Based on the estimation result by the second estimation unit for each of the plurality of speakers, a delay time for each audio signal to be given by the delay unit is calculated, and the calculated delay time is calculated with respect to the delay unit. Delay control means to set;
The acoustic device according to claim 7, comprising:   The acoustic device according to claim 1, wherein the acoustic device is mounted on a moving body. A test audio output step for sequentially outputting test audio from each of a plurality of speakers;
A first estimation step of estimating a distance from the specific position to each of the plurality of speakers based on a sound collection result of the test sound at a specific position having a predetermined positional relationship with an assumed listening position in the sound field space; ;
A second estimation step of estimating a distance from each of the plurality of speakers to the assumed listening position based on the estimation result in the first estimation step and the predetermined positional relationship;
A delay time estimating step of estimating a propagation delay time of sound from each of the plurality of speakers to the assumed listening position based on an estimation result in the second estimating step;
A delay measurement method comprising: A delay measurement program for causing a calculation means to execute the delay measurement method according to claim 10.

  A recording medium in which the delay measurement program according to claim 11 is recorded so as to be readable by an arithmetic means.

Images