JP2009141385A - Sound field control method, sound field control device, sound collection device, speaker device, and sound field control program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sound field control method for achieving, with a simple process, a sound field by using a front surround system applicable to an actual listening environment where no speaker can be placed behind a listener and controlling the sound field so as to be appropriate for the actual location where respective speakers are placed. <P>SOLUTION: A sound emitted from a surround speaker 4SR or 4SL arranged in front of a listener M and emitting a sound having a sound image to be localized at a location other than the front is collected by using a right microphone RM and a left microphone LM arranged respectively at both ears of the listener M. The sound emission direction from one of the speakers is adjusted on the basis of a right microphone signal Srm and a left microphone signal Slm respectively corresponding to the collected sounds. Furthermore, localization control parameters are generated for controlling the location of the sound image corresponding to the respective speakers according to the difference. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present application belongs to the technical field of a sound field control method, a sound field control device, a sound collecting device, a speaker device, and a sound field control program, and more specifically, by a plurality of speaker means arranged only in front of a listener. In the technical field of a sound field control method, a sound field control device and a sound field control program for realizing a sound field surrounding the listener, and a sound collecting device and a speaker device for realizing the sound field control Belongs.

  In DVD (Digital Versatile Disc), which has become widespread in recent years, and in terrestrial digital broadcasting that has just begun to be broadcast in some parts of the country, audio signals for realizing a so-called surround sound field that is rich in realism May be provided.

  Conventionally, for example, in order to realize the surround sound field by using the 5.1-channel audio signal (that is, the audio signals for a total of six speakers including a subwoofer for bass), the front of the listener is used. In addition to this, it is necessary to arrange a plurality of speakers (so-called surround speakers) on the side or rear thereof.

  Here, in the surround system in which a plurality of speakers are arranged around the listener as described above, techniques for realizing a more realistic sound field include techniques described in the following patent documents, for example.

On the other hand, in view of recent housing circumstances, the sound image realized by the speakers arranged on the side or rear of the listener in the above-described surround system is a plurality of sound images arranged on the front (front) of the listener. There is an increasing demand for a so-called front surround system that is realized only by speakers (that is, a space for arranging the side or rear speakers can be eliminated).
JP-A-5-297881 JP 2001-224100 A

  However, the technique described in each of the above-mentioned patent documents is based on the position where the sound to be emitted from each surround speaker is to be originally placed (that is, in a side or rear speaker, This is based on the premise that sound is emitted from each speaker arranged at the original side position or the rear position, and is not a technique corresponding to the above-described front surround.

  In addition, in the prior art including the above-mentioned patent documents, as a method for realizing a more realistic surround sound field, both ears of a so-called dummy head, which is a model simulating a human head in full size, are used. There is a case where a microphone is embedded in a corresponding portion, and a sound collected by the microphone is processed using a so-called head-related transfer function and then emitted from each speaker.

  However, it is known that it is practically impossible to automatically calculate a realistic and stable solution when trying to apply the method using the head-related transfer function to an actual listening environment. There is a problem that some replacement and processing must be omitted, and as a result, the purpose of using the head-related transfer function for the purpose of improving the sense of reality is diminished.

  Furthermore, the acoustic environment in the home where the surround system sold for home use is actually different for each home (house) is usually different. There are many cases where parameters for field correction do not make sense.

  Therefore, the present application has been made in view of the above problems, and the problem is to create a sound field by a front surround system applicable to an actual listening environment in which a speaker cannot be placed behind the listener. A sound field control method, a sound field control device, a sound field control program and a sound field control method that can be realized by simple processing and can control the sound field so as to be adapted to an actual place where each speaker is arranged. An object of the present invention is to provide a sound collecting device and a speaker device for realizing field control.

  In order to solve the above-mentioned problem, the invention according to claim 1 is a plurality of speaker means arranged in front of the listener, and emits a sound to be localized at a position other than the front. Sound for pre-adjustment emitted from any of speaker means such as a surround left speaker and surround right speaker, right ear sound collecting means such as a right microphone disposed at the position of the listener's right ear, and A left ear sound collecting means such as a left microphone arranged at the position of the listener's left ear, and the right ear collected signal corresponding to the collected sound for pre-adjustment is collected to the right A sound collecting step of outputting from the sound collecting means for left ear corresponding to the collected sound for pre-adjustment that is output from the sound collecting means for ear and the sound collecting direction in any of the above, Adjust based on the difference between the output right ear sound collection signal and left ear sound collection signal An adjustment step, a generation step of generating control information for controlling the position of the sound image corresponding to each of the speaker means based on the difference, and an actual sound emission from each of the speaker means. Based on the control information obtained by executing the sound collecting step, the adjusting step, and the generating step for each of the speaker units, output signals corresponding to the sounds to be output to the speaker units are output. A processing step for processing each speaker means; and a sound emitting step for emitting the sound corresponding to the processed output signal from each speaker means.

  In order to solve the above-mentioned problem, the invention according to claim 2 is a sound collecting device used for carrying out the sound field control method according to claim 1 and outputs the right ear sound collecting signal. The right ear sound collection means such as a right microphone, the left ear sound collection means such as a left microphone that outputs the left ear sound collection signal, and the right ear sound collection means are supported at the position of the right ear. Right ear sound collecting means supporting means such as a supporting part, and left ear sound collecting means supporting means such as a supporting part for supporting the left ear sound collecting means at the position of the left ear.

  In order to solve the above-mentioned problem, the invention described in claim 3 is a sound field control device provided for carrying out the sound field control method according to claim 1, wherein the generation step is performed to execute the sound field control method. Control information generating means such as a signal processing section that generates control information, and processing means such as a signal processing section that executes the processing step and processes the output signals.

  In order to solve the above-mentioned problem, a fourth aspect of the present invention is a speaker device including each of the speaker means used for carrying out the sound field control method according to the first aspect, based on the difference. And changing means such as a rotating part for changing the sound emitting direction based on a direction control signal output from the sound field control device according to claim 3.

  In order to solve the above problem, an invention according to a ninth aspect causes a computer to function as the sound field control device according to any one of the third or fifth to eighth aspects.

  Next, the best mode for carrying out the present application will be described with reference to the drawings. In addition, in each embodiment described below, in the acoustic device as the above-described surround system including a plurality of speakers, the adjustment method in the acoustic device for realizing the surround sound field with a listener as the center is provided. This is an embodiment when the present application is applied.

(I) First Embodiment First, a first embodiment according to the present application will be described with reference to FIGS. 1 is a block diagram showing a schematic configuration of the audio device according to the first embodiment, FIG. 2 is an external perspective view of a surround speaker included in the audio device, and FIG. 3 is a detailed configuration of the audio device. FIG. 4 to FIG. 7 are flowcharts showing the operation of the acoustic apparatus.

  As shown in FIG. 1, the acoustic device S according to the first embodiment emits a reproducing unit 1, a subwoofer 4W that emits a low-frequency sound in the surround sound field, and a front center sound in the surround sound field. A center speaker 4C that emits sound, a right speaker 4R that emits a front right sound in the surround sound field, a left speaker 4L that emits a front left sound in the surround sound field, and a surround right sound in the surround sound field. Surround right speaker 4SR as speaker means for emitting sound, surround left speaker 4SL as speaker means for emitting surround left sound in the surround sound field, and headphone type right ear sound collecting means worn by the listener M The right microphone RM and the left microphone LM as the left ear sound collecting means.

  In this configuration, the surround right speaker 4SR and the surround left speaker 4SL are to be installed on the right rear (in the case of the surround right speaker 4SR) and the left rear (in the case of the surround left speaker 4SL) of the listener M conventionally. However, in the acoustic device S according to the first embodiment, it is installed in front of the listener M like the other center speakers 4C and the like. For each speaker, for example, as viewed from the position of the listener M, in order from the front right, a subwoofer 4W, a surround right speaker 4SR, a right speaker 4R, a center speaker 4C, a left speaker 4L, and a surround left speaker 4SL. The center speaker 4C is installed in front of the listener M.

  In addition to these, each of the surround right speaker 4SR and the surround left speaker 4SL includes a speaker body 35, a support shaft 36, a stepping motor and the like, as shown in FIG. The rotating unit 37 is a changing unit that rotates in a horizontal plane, and a base member 38. The rotation of the support unit 36 and the speaker main body 35 by the rotating unit 37 is not shown from the control unit 11 described later. It is controlled by the operation of the rotating unit 37 based on the angle control signal.

  On the other hand, the right microphone RM is attached near the right ear of the listener M with the sound collecting portion facing the center speaker 4C and the like, and the left microphone LM is located near the left ear of the listener M near the center speaker 4C. The right microphone RM and the left microphone RL are mounted by a support portion H serving as a right ear sound collecting means support means and a left ear sound collection means support means. Held in their respective positions.

  Further, the playback unit 1 is a surround as a sound source of sound to be emitted from the amplifier 13, the A / D converter 14, the analysis unit 15, and the speakers connected to the right microphone RM and the left microphone LMm. A disk drive 12 that reproduces the surround sound signal from the optical disk DK on which the sound signal is recorded, a signal processing unit 16 as a control information generation unit and a processing unit, a control unit 11 as a direction control signal generation unit, and a test The signal generator 10, the D / A converter 2W and the amplifier 3W connected to the subwoofer 4W, the D / A converter 2SR and the amplifier 3SR connected to the surround right speaker 4SR, and the right speaker 4R Connected D / A converter 2R and amplifier 3R, and D connected to the center speaker 4C An A converter 2C and an amplifier 3C, a D / A converter 2L and an amplifier 3L connected to the left speaker 4L, and a D / A converter 2SL and an amplifier 3SL connected to the surround left speaker 4SL. ing.

  Next, the overall operation will be described.

  First, an operation in an adjustment stage (adjustment stage before reproducing actual music or the like) for realizing the surround sound field by sounds emitted from the speakers in the acoustic device S will be described.

  The adjustment stage includes a “localization control stage” for adjusting the position of the sound image with respect to the listener M by sounds emitted from the surround right speaker 4SR and the surround left speaker 4SL, and each sound emitted from each speaker. Are classified into two stages, namely, “sound field control stage” for controlling the entire sound field realized for the listener M. First, the localization control stage is adjusted, and then the sound field control stage is Executed.

  In each control step, the test signal generation unit 10 generates a test signal Stest having a preset frequency and amplitude based on the control signal Sct from the control unit 11 and outputs the test signal Stest to the signal processing unit 16.

  Next, in each control stage, the signal processing unit 16 outputs the test signal Stest as output signals Sw to Ssl to the D / A converters 2W to 2SL, respectively. Then, based on the control signal Scc output from the control unit 11 based on the result of collecting the sound corresponding to the output signals Sw to Ssl output from each speaker by the right microphone RM and the left microphone LM, the surround right A localization parameter to be described later for controlling the position of the sound image emitted from the speaker 4SR and the surround left speaker 4SL is adjusted, and the sound field realized by the sound emitted from each speaker is controlled. To adjust the sound field control parameters.

  On the other hand, in each of the above control steps, the D / A converter 2W converts the output signal Sw as the test signal Stest into an analog signal and outputs the analog signal to the amplifier 3W as the analog output signal Saw. The amplifier 3W performs an amplification process on the analog output signal Saw with a preset amplification factor and outputs the amplified signal to the subwoofer 4W as the speaker drive signal Sdw. Thereby, the subwoofer 4W adjusts the frequency and sound pressure of the sound corresponding to the speaker drive signal Sdw (that is, the sound to be emitted from the subwoofer 4W in order to realize the surround sound field, respectively). (Sound output from the subwoofer 4W) as a test sound in the control stage.

  On the other hand, in each of the above control steps, the D / A converter 2C converts the output signal Sc as the test signal Stest into an analog signal and outputs the analog signal to the amplifier 3C as the analog output signal Sac. The amplifier 3C performs amplification processing on the analog output signal Sac with a preset amplification factor, and outputs the amplified signal to the center speaker 4C as the speaker drive signal Sdc. Thereby, the center speaker 4C adjusts the frequency and sound pressure of the sound corresponding to the speaker drive signal Sdc (that is, the sound to be emitted from the center speaker 4C in order to realize the surround sound field, respectively). (Sound output from the center speaker 4C) as a test sound in the control stage.

  Similarly, in the respective control steps, the D / A converters 2R and 2L convert the output signals Sr and Sl as the test signal Stest into analog signals, respectively, and the analog output signals Sar and Sal are supplied to the amplifiers 3R and 3L, respectively. Output. Then, the amplifiers 3R and 3L perform amplification processing and the like on the analog output signals Sar and Sal with a preset amplification factor, and output the speaker driving signals Sdr and Sdl to the right speaker 4R and the left speaker 4L, respectively. Thus, the right speaker 4R and the left speaker 4L should emit sounds corresponding to the speaker driving signals Sdr and Sdl (that is, the right speaker 4R and the left speaker 4L, respectively, in order to realize a surround sound field). (Sounds output from the right speaker 4R and the left speaker 4L) are emitted as test sounds in the respective control steps for adjusting the frequency and sound pressure of the sound.

  Finally, in the respective control steps, the D / A converters 2SR and 2SL convert the output signals Ssr and Ssl as the test signals Stest into analog signals, respectively, and the analog output signals Sasr and Sasl are respectively supplied to the amplifiers 3SR and 3SL. Output. Then, the amplifiers 3SR and 3SL perform amplification processing or the like on the analog output signals Sasr and Sasl with a preset amplification factor, and output them to the surround right speaker 4SR and the surround left speaker 4SL as speaker drive signals Sdsr and Sdsl, respectively. To do. As a result, the surround right speaker 4SR and the surround left speaker 4SL release sounds corresponding to the respective speaker drive signals Sdsr and Sdsl (ie, the surround right speaker 4SR and the surround left speaker 4SL, respectively, in order to realize a surround sound field). (Sounds output from the surround right speaker 4SR and the surround left speaker 4SL) are emitted as test sounds in the respective control steps for adjusting the frequency and sound pressure of the sound to be generated.

  The right microphone RM held at the position of the right ear of the listener M and the left microphone LM held at the position of the left ear receive the sound output from each speaker in the respective control steps. Sounds are collected respectively, and a right microphone signal Srm and a left microphone signal Slm corresponding to the collected sounds are generated and output to the amplifier 13.

  Thus, the amplifier 13 performs amplification processing or the like on the right microphone signal Srm and the left microphone signal Slm independently of each other with a preset amplification factor, and the amplified microphone signal Samp is converted into the right microphone signal Srm and the left microphone signal. Each Slm is generated and output to the A / D converter 14.

  The A / D converter 14 digitizes the amplified microphone signal Samp corresponding to the right microphone signal Srm and the left microphone signal Slm, generates a digital microphone signal Sd, and outputs the digital microphone signal Sd to the analysis unit 15.

  Next, the analysis unit 15 analyzes the contents of each digital microphone signal Sd based on the control signal Scan from the control unit 11, and adjusts the localization parameter and the sound field control parameter in the signal processing unit 16. An analysis signal San for use in the adjustment process is generated and output to the signal processing unit 16. Then, the signal processing unit 16 adjusts the localization parameter and the sound field control parameter by executing each adjustment process based on the analysis signal San.

  Next, the overall operation in the case of actually reproducing music using the surround sound field after the localization parameters for the surround sound field and the sound field control parameters are adjusted will be described.

  When reproducing the music, first, the optical disk DK is loaded into the disk drive 12.

  Then, the disk drive 12 reproduces a surround sound signal to be reproduced from the optical disk DK, and outputs it to the signal processing unit 16 as a reproduction signal Sdk corresponding to each of the speakers.

  Thus, the signal processing unit 16 converts the reproduction signal Sdk by applying the adjusted sound field control parameter for each reproduction signal Sdk corresponding to each speaker, and outputs the output signal Sw for the subwoofer 4W. The output signal Sr for the right speaker 4R, the output signal Sc for the center speaker 4C, and the output signal Sl for the left speaker 4L are output to the D / A converters 2W, 2R, 2C, and 2L, respectively.

  Thereafter, the D / A converters 2W, 2R, 2C, and 2L analogize the output signals Sw, Sr, Sc, and Sl, respectively, similarly to the operation in the adjustment stage described above, and analog output signals Saw, Sar, Sac, and Sal. Are output to the amplifiers 3W, 3R, 3C and 3L, respectively.

  The amplifiers 3W, 3R, 3C, and 3L perform the above-described amplification processing on the analog output signals Saw, Sar, Sac, and Sal, and the subwoofer 4W, the right speaker 4R, the center speaker 4C, and the left speaker 4L, respectively. Speaker drive signals Sdw, Sdr, Sdc and Sdl corresponding to the sound to be reproduced are generated and output to the subwoofer 4W, right speaker 4R, center speaker 4C and left speaker 4L, respectively.

  Thus, the subwoofer 4W, the right speaker 4R, the center speaker 4C, and the left speaker 4L release the sound that the four speakers should emit to the listener M when playing the music as a surround sound field. Sound.

  In parallel with this, the signal processing unit 16 uses the adjusted localization parameters for the reproduction signal Sdk converted for the surround right speaker 4SR and the surround left speaker 4SL, respectively, in front of the listener M. A localization control process is performed to realize a sound image localized backward with respect to the listener M by sound emitted from the installed surround right speaker 4SR and surround left speaker 4SL, and the output for the surround right speaker 4SR is performed. The signal Ssr and the output signal Ssl for the surround left speaker 4SL are output to the D / A converters 2SR and 2SL, respectively.

  Thereafter, the D / A converters 2SR and 2SL analogize the output signals Ssr and Ssl, respectively, in the same manner as the operation in the adjustment stage described above, and output the analog output signals Sasr and Sasl to the amplifiers 3SR and 3SL, respectively.

  The amplifiers 3SR and 3SL perform the above-described amplification processing on the analog output signals Sasr and Sasl, and speaker driving signals Sdsr and Sdsl corresponding to sounds to be reproduced from the surround right speaker 4SR and the surround left speaker 4SL, respectively. Are respectively generated and output to the surround right speaker 4SR and the surround left speaker 4SL.

  As a result, the surround right speaker 4SR and the surround left speaker 4SL can reproduce a rear sound image (by the surround right speaker 4SR and the surround left speaker 4SL installed in front of the listener M) when reproducing the music as a surround sound field. ) To realize the sound, the sound to be emitted by the two speakers is emitted to the listener M.

  Next, a detailed configuration of the signal processing unit 16 will be described with reference to FIG.

  First, as shown in FIG. 3A, the signal processing unit 16 includes a sound field control unit 20, a localization control unit 21, and switches 22 to 27.

  In this configuration, the switches 22 to 27 are each switched to the test signal Stest side in the adjustment stage. The switch 27 outputs the test signal Stest to be the output signal Sw to the D / A converter 2W via the sound field control unit 20, and the switch 26 outputs the test signal Stest to be the output signal Sl as a sound. The switch 25 outputs the test signal Stest to be the output signal Sr to the D / A converter 2R via the sound field controller 20 via the field controller 20, and the switch 25 24 outputs the test signal Stest to be the output signal Sc to the D / A converter 2C via the sound field control unit 20, and the switch 23 outputs the test signal Stest to be the output signal Ssr to the sound field control unit 20. The switch 22 outputs the test signal Stest to be the output signal Ssl via the sound field control unit 20 and the localization control unit 21 to the D / A converter. Respectively output to the SL.

  On the other hand, the sound field control unit 20 is for the sound field control adjusted in the sound field control stage during the reproduction of the music (the switches 22 to 27 are respectively switched to the disk drive 12 side). A sound field control process using the sound field control parameter for the reproduction signal Sdk for each speaker, which is obtained as a control signal Scc and is input from the disk drive 12 via the switches 22 to 27. The output signals Sw, Sl, Sc and Sr are generated for the subwoofer 4W, the left speaker 4L, the center speaker 4C and the right speaker 4R, and are output to the D / A converters 2W, 2L, 2C and 2R.

  For the surround right speaker 4SR and the surround left speaker 4SL, a sound field control process is performed on the reproduction signal Sdk for the surround right speaker 4SR and the surround left speaker 4SL using the sound field control parameters. The converted signals Ssrr and Ssll are output to the localization control unit 21, respectively.

  As a result, the localization control unit 21 acquires the localization control parameter adjusted in the localization control stage as the control signal Scc during reproduction of the music, and the conversion input from the sound field control unit 20 A localization control process using the localization control parameters is performed on the signals Ssrr and Ssll, and the output signals Ssl and Ssr are generated for the surround left speaker 4SL and the surround right speaker 4SR to generate the D / A converter 2SL, Output to 2SR.

  Next, a detailed configuration of the localization control unit 21 will be described with reference to FIG.

  As shown in FIG. 3B, the localization control unit 21 includes a left attenuator 30l, a left bandpass / delay unit 31l, a right attenuator 30r, a right bandpass / delay unit 31r, and adders 33l and 33r. , Is configured.

  In this configuration, the left attenuator 30l attenuates the amplitude of the converted signal Ssll based on the attenuation parameter included in the sound field control parameter for the surround right speaker 4SR set in the sound field control stage. A signal Satl is generated and output to the left bandpass / delay unit 31l.

  As a result, the left band pass / delay unit 31l has a predetermined divided frequency band in the attenuation signal Satl with respect to the attenuation signal Satl based on the delay parameter included in the sound field control parameter. In response, filtering and delay processing are performed to generate a delay signal Sdyl and output it to the adder 33l.

  Thereafter, the adder 33l adds the conversion signal Ssrr for the surround right speaker 4SR and the delay signal Sdyl (that is, the delay signal Sdyl generated from the conversion signal Ssll for the surround left speaker 4SL), and outputs the output signal. It is output to the D / A converter 2SR as Ssr.

  On the other hand, the right attenuator 30r attenuates the amplitude of the converted signal Ssrr based on the attenuation parameter included in the sound field control parameter for the surround left speaker 4SL set in the sound field control stage, thereby reducing the attenuation signal Satr. And output to the right band pass / delay unit 31r.

  As a result, the right band pass / delay unit 31r uses the delay parameter included in the sound field control parameter to set the division frequency band set in advance in the attenuation signal Satr to the attenuation signal Satr. In response, filtering processing and delay processing are performed to generate a delay signal Sdyr and output it to the adder 33l.

  Thereafter, the adder 33l adds the conversion signal Ssll for the surround left speaker 4SL and the delay signal Sdyr (that is, the delay signal Sdyr generated from the conversion signal Ssrr for the surround right speaker 4SL), and outputs the output signal. It is output to the D / A converter 2SL as Ssl.

  Here, by the function of the localization control unit 21 described above, the sound whose sound image is localized behind the listener M is emitted from the surround right speaker 4SR and the surround left speaker 4SL arranged in front of the listener M. The principle that enables this will be briefly described.

  The principle is that when the listener M listens to the sound from the surround right speaker installed in the right rear of the listener M, for example, the sound from the right speaker that is heard by the right ear is heard. And the sound from the surround right speaker heard by the left ear, the difference between the level of the sound heard by the right ear and the level of the sound heard by the left ear is Compared to the case where the speaker is located on the right front side, the size is significantly increased.

  On the other hand, generating the above-described level difference between the left and right ears means that a sound that attenuates the sound emitted from the surround right speaker at the position of the left ear is given to the listener. This can also be realized by emitting sound from a surround left speaker installed in a position that makes a pair with the speaker.

  Therefore, the sound to be emitted from the surround right speaker 4SR is changed to the sound from the surround right speaker 4SR by the operations of the right attenuator 30r, the right band pass / delay unit 31r and the adder 33r shown in FIG. Is attenuated in advance according to the position of the sound image to be localized (that is, the position on the right rear side when viewed from the listener), and is delayed for each wavelength (each frequency) by an amount corresponding to the time. If the sound is emitted from the surround left speaker 4SL at the same time as the sound is emitted from the surround right speaker 4SR, the sound that is emitted from the surround right speaker 4SR and reaches the listener's left ear by the attenuated and delayed sound. Can be attenuated at the position of the left ear. At this time, the sound emitted from the surround right speaker 4SR reaches the listener's right ear almost as it is (that is, without being attenuated as much as the position of the left ear). If the level difference is given to the left and right ears, the actual listening situation described above for the left and right ears (that is, when the sound from the surround right speaker installed at the right rear is actually heard by both ears, a large level difference is caused. The same situation can be reproduced.

  On the other hand, in the same manner as described above, the surround left speaker 4SL emits sound from the surround left speaker 4SL by the operations of the left attenuator 30l, the left bandpass / delay unit 31l and the adder 33l shown in FIG. The sound to be played is attenuated in advance according to the position of the sound image to which the sound from the surround left speaker 4SL is to be localized (that is, the left rear position as viewed from the listener), and for each wavelength (each frequency) If the sound is emitted from the surround right speaker 4SR at the same time as the sound is emitted from the surround left speaker 4SL after being delayed by a time corresponding to each independently, the surround left speaker is caused by the attenuated and delayed sound. The sound emitted from the 4SL and reaching the listener's right ear can be attenuated at the position of the right ear. At this time, the sound emitted from the surround left speaker 4SL reaches the listener's left ear almost as it is (that is, without being attenuated as much as the position of the right ear). If a level difference is given to the left and right ears, the actual listening situation described above for the left and right ears (that is, when the sound from the surround left speaker installed on the left rear is actually heard with both ears, a large level difference is produced. The same situation can be reproduced.

  Based on the principle as described above, the sound whose local sound images are localized to the right rear and left rear of the listener M is emitted from the surround right speaker 4SR and the surround left speaker 4SL arranged in front of the listener M. Is possible.

  Next, the operation in the adjustment stage for realizing the surround sound field according to the first embodiment will be specifically described with reference to FIGS.

  First, the entire operation will be described with reference to FIG.

  This operation is performed acoustically, for example, by the listener M who newly purchases and installs the sound device S before actually playing music or by changing the design of the room where the sound device S is set. This is an operation executed when the listener M wears the right microphone RM and the left microphone LM when the environment changes, and specifically, as shown in FIG. Including a localization adjustment process (step S1) for adjusting the position of the sound image of the sound emitted from the speaker 4SR and the surround left speaker 4SL, and a sound field adjustment process (step S2) executed after the localization adjustment. Yes.

  The localization adjustment process (step S1) is more specifically performed as shown in FIG. 4 (b) in the direction of sound emission to the listener M at the place where the surround left speaker 4SL is installed (that is, the surround left The left speaker angle adjustment (step S10) in which the orientation of the speaker 4SL itself with respect to the listener M) is physically adjusted by the operation of the rotating unit 37, and similarly the release to the listener M at the place where the surround right speaker 4SR is installed. Right speaker angle adjustment (step S11) in which the sound direction (direction of the surround right speaker 4SR itself with respect to the listener M) is physically adjusted by the operation of the rotating unit 37, and the sound emission direction adjusted in step S10. As a premise, the position of the sound image of the sound emitted from the surround left speaker 4SL is the left rear of the listener M. The left localization parameter adjustment process (step S12) for adjusting the localization control parameters for controlling the sound and the sound emitted from the surround right speaker 4SR on the premise of the sound emission direction adjusted in step S11. Right localization parameter adjustment processing (step S13) for adjusting the localization control parameter for controlling the position of the sound image to be right rearward of the listener M.

  Next, the adjustment of the sound emission direction of each of the surround right speaker 4SR and the surround left speaker 4SL (hereinafter referred to as “each surround speaker” as appropriate), which is executed as steps S10 and S11, will be specifically described with reference to FIG. I will explain. Note that the adjustment in each of steps S10 and S11 is basically only a difference between whether the adjustment target is the surround left speaker 4SL (step S10) or the surround right speaker 4SR (step S11). These are commonly described in FIG.

  As the sound emission direction adjustment processing (steps S10 and S11) in each surround speaker, as shown in FIG. 5, the support unit using the rotation unit 37 for the surround speaker by the angle control signal (not shown) from the control unit 11 is used. 36 and the speaker main body 35 are rotated to determine a preset initial sound emitting direction θ (steps S20 and S21). At this time, the initial sound emitting direction θ may be determined including the movement of the installation position of each surround speaker itself.

  Here, the sound emission direction θ is, for example, a direction in a horizontal plane parallel to the straight line connecting the position of each surround speaker and the position of the midpoint of the straight line connecting both ears of the listener M “θ = 0 ° sound emission direction ”. Further, it is assumed that the outward direction when viewed from the listener M is the positive direction at θ for each surround speaker.

  Then, a sound corresponding to the test signal Stest is emitted from each surround speaker (step S22).

  Next, based on the right microphone signal Srm and the left microphone signal Slm obtained by collecting the emitted sound with the right microphone RM and the left microphone LM, the analysis unit 15 compares the level difference between the microphone signals ( Amplitude difference) is detected, and the parameter diff indicating the level difference is set to the detected level difference value (step S23).

  Then, the value of the set parameter diff and the threshold of the level difference set in advance for each surround speaker (that is, an experiment in advance to sufficiently remove the so-called crosstalk included in the sound from each surround speaker) When the value of the parameter diff is larger than the threshold, and whether or not the value of the parameter diff is larger than the threshold (step S24). (Step S24; YES), the adjustment of the sound emission direction θ for each surround speaker is completed, and the process proceeds to each localization control parameter adjustment process shown in FIG.

  On the other hand, if it is determined in step S24 that the value of the parameter diff is still less than or equal to the threshold value (step S24; NO), it is determined that the removal of the crosstalk is insufficient in the current sound emission direction θ, and the sound emission is performed. The direction θ is further increased (that is, for the surround left speaker 4SL, the surround left speaker 4SL is rotated in the clockwise direction as viewed from above using the rotation unit 37, and for the surround right speaker 4SR, The surround right speaker 4SR is rotated in the counterclockwise direction as viewed from (steps S25 and S21), and the processing in steps S22 to S24 is repeated for the sound emission direction θ after the rotation.

  When the sound emission direction θ is set for each surround speaker by executing the processes of steps S10 and S11 described above, the cross between the surround speakers can be used even when the sound is simultaneously emitted from the surround speakers. The sound emission direction θ in a state where the talk is sufficiently reduced is adjusted (determined) for each surround speaker.

  Next, the adjustment of the localization control parameter based on the sound emission direction θ adjusted in steps S10 and S11 for each surround speaker, which is executed as steps S12 and S13, will be specifically described. 6 will be described. Note that the adjustment in each of steps S12 and S13 is the same as in steps S10 and S11 described above, whether the adjustment target is the surround left speaker 4SL (step S12) or the surround right speaker 4SR (step S13). Therefore, these will be described in common in FIG.

  As the localization control parameter adjustment processing (steps S12 and S13) in each surround speaker, as shown in FIG. 6, for each surround speaker, the frequency band number obtained by dividing the entire reproduction frequency band in advance is set. Parameter i and the delay amount obtained by dividing the delay amount in the right bandpass delay unit 31r and the left bandpass delay unit 31l (hereinafter referred to as “delay units” as appropriate) in a stepwise manner. The parameter j indicating the stage is initialized (steps S30 and S31).

  Here, specifically, in the division of the entire frequency band in step S30, for example, the center frequency fc of each divided frequency band is fc = 250 hertz (parameter i = 1) and fc = 500 hertz (parameter i = 2), fc = 1 kilohertz (parameter i = 3), fc = 2 kilohertz (parameter i = 4), and fc = 4 kilohertz (parameter i = 5).

  When the initialization of each parameter is completed, next, the parameter D (i) indicating the level difference (amplitude difference) between the right microphone signal Srm and the left microphone signal Slm in each of the divided frequency bands, and each delay Since the position of the sound image of the sound emitted from each surround speaker is ideally right rear or left rear of the listener M, the optimal level difference obtained in advance for each frequency band is optimal. A parameter minDiff indicating a difference from a value (hereinafter, the optimum value is assumed to be tgtD (i)) is temporarily set to infinity (step S32), and further, for each divided frequency band i and each delay unit Delay (j) is set as delay (j), and the sound corresponding to the test signal Stest (the test signal Stest having a frequency corresponding to the frequency band at that time) is set as a localization control parameter setting target at that time. That is emitted from the surround speaker (step S33).

  Here, specifically, when the localization control parameter in the surround left speaker 4SL is adjusted as the processing in step S33 (step S12), the test signal that is not delayed by the delay amount delay (j) is used. The sound corresponding to Stest is emitted as it is from the surround left speaker 4SL and is attenuated by the left attenuator 30l (see FIG. 3B) and is delayed by the delay amount delay (j). The corresponding sound is emitted from the surround right speaker 4SR (step S33).

  On the other hand, when the localization control parameter in the surround right speaker 4SR is adjusted (step S13), the sound corresponding to the test signal Stest that is not delayed by the delay amount delay (j) is directly used as the surround right speaker. 4SR, and the sound corresponding to the test signal Stest attenuated by the right attenuator 30r (see FIG. 3B) and delayed by the delay amount delay (j) is emitted from the surround left speaker 4SL. Make a sound (step S33).

  Next, on the basis of the right microphone signal Srm and the left microphone signal Slm obtained by collecting the emitted sounds with the right microphone RM and the left microphone LM, the analysis unit 15 performs the above-described operation between the microphone signals at that time. A level difference is detected, and the parameter D (i) indicating the level difference is set to the detected level difference value (step S34).

  Then, an absolute value Diff of the current difference between the value of the parameter D (i) set in step S34 and the optimum value tgtD (i) is obtained (step S35), and the obtained absolute value Diff and the current value are calculated. The relationship with the parameter minDiff is confirmed (step S36).

  If it is determined in step S36 that the current absolute value Diff is smaller than the parameter minDiff (step S36; YES), the value of the parameter minDiff is updated to the current absolute value Diff, and the frequency band is further updated. The value of the parameter optD (i) indicating the optimum delay amount in each delay unit is set as the current delay amount delay (j) in each delay unit (step S37), and the process proceeds to step S38 described later.

  On the other hand, if it is determined in step S36 that the current absolute value Diff is not smaller than the parameter minDiff (step S36; NO), the parameter j indicating the delay amount is incremented (step S38) and further set in each delay unit. It is checked whether or not the maximum possible delay amount (the maximum value is shown as “Dsize” in FIG. 6) (step S39).

  Then, when it is possible to set a delay amount larger than the current delay amount (step S39; NO), the step that has been described above by returning to step S32 for the incremented new delay amount is performed. The processes from S32 to S39 are repeated.

  On the other hand, when the current delay amount is the maximum delay amount Dsize that can be set in step S39 (step S39; YES), the parameter i is incremented to set the optimum delay amount optD (i) for the next frequency band. (Step S40) It is confirmed whether or not the optimum delay amount optD (i) has been calculated for all the divided frequency bands (Step S41. In Step S41, the parameter i indicating each divided frequency band is changed. The value obtained by adding “1” to the maximum value is indicated as “N”).

  When the calculation of the optimum delay amount optD (i) is completed for all the divided frequency bands (step S41; YES), the optimum delay amount optD (i) is set for each frequency band. Each delay unit is set (step S42), and the localization control parameter setting process is completed.

  On the other hand, if it is determined in step S41 that there is a frequency band for which the calculation of the optimum delay amount optD (i) has not yet been completed (step S41; NO), the optimum delay amount optD (i) for the uncalculated frequency band. , The process returns to step S31, and the processes of steps S31 to S41 are repeated for the new frequency band.

  6 is executed for each of the surround left speaker 4SL and the surround right speaker 4SR (steps S12 and S13 in FIG. 4), the delay amount in each delay unit is the optimum delay for each frequency band. Set as quantity optD (i).

  Next, the sound field adjustment processing (step S2) shown in FIG. 4A will be specifically described with reference to FIG.

  The sound field adjustment process executed subsequent to the localization control process (step S1) is performed in the sound field control unit 20 so that the sound pressures from all the speakers shown in FIG. Specifically, for example, the same process as the sound field adjustment process described in Patent Document 2 is executed.

  That is, in the sound field adjustment process, an equalizer adjustment process (for equalizing the frequency characteristics in relation to other speakers) for each speaker while emitting sounds corresponding to the test signal Stest from each speaker. Step S50), an attenuator (attenuation) adjustment process for making the reproduction level uniform in relation to other speakers (Step S51), and the distance between each speaker and the position of the listener M is made uniform among the speakers. Delay amount adjustment processing (step S52) is executed.

  In the case of the first embodiment, sound is collected using the right microphone RM and the left microphone LM. Therefore, in the processing of steps S50 to S52, the right microphone signal Srm and the left microphone signal Slm output from each microphone, respectively. It is preferable to use an average value or the like of the measured values.

  Here, the sound image created (virtually) by the sound image localization control process according to the first embodiment executed for each of the surround speakers is emitted by a normal actual sound image (that is, a speaker actually located at that position). The sound pressure level is generally smaller than the sound image formed by the sound. For this reason, the process of step S51 for aligning the sound pressure level of the surround sound corresponding to the virtual sound image and the front sound emitted from the front speaker is an essential process.

  As described above, according to the operation of the adjustment stage for realizing the surround sound field in the acoustic device S according to the first embodiment, each of the values is determined based on the difference between the right microphone signal Srm and the left microphone signal Slm. A reproduction signal corresponding to the sound to be emitted at the time of actual sound emission based on the localization control parameter and the sound field control parameter generated based on the difference by adjusting the sound emission direction θ in the speaker Since Sdk is processed to emit sound, the sound emission direction (ie, directivity) in each speaker is physically adjusted, and then the localization control parameters and sound field control parameters for sound field control are generated. With this process, each parameter is generated and the reproduction signal Sdk is processed to control the sound field by each speaker.

  Also, since each parameter is generated based on the sound actually collected by the right microphone RM and the left microphone LM, the sound field can be controlled while adapting to the actual location where each speaker is arranged.

  Further, the surround right speaker 4SR and the surround left speaker 4SL arranged in front of the listener M simplify the processing when the sound field is localized at a position other than the front, so that the surround sound is rearward of the listener. Even in an actual environment where a speaker cannot be installed, a desired sound field (for example, a surround sound field) can be realized with a simple and inexpensive device.

  Furthermore, a sound image at a position other than the front can be realized by a simple process using the level difference between the right microphone signal Srm and the left microphone signal Slm.

  Further, by changing the sound emission direction θ of each surround speaker automatically by the operation of the control unit 11 and the rotation unit 37, a clearer sound image localization can be realized by a simple process.

  In the first embodiment described above, the localization control parameter and the sound field control parameter are adjusted using the level difference (amplitude difference) between the right microphone signal Srm and the left microphone signal Slm. In addition, the localization control parameter and the sound field control parameter are set by the same processing as in the first embodiment using the difference in timing (time difference) when the same sound is collected by the right microphone RM and the left microphone LM, respectively. Is also possible. In this case, for example, the parameter Diff in step S23 in FIG. 5 and the parameter D (i) in step S34 in FIG. 6 are values indicating the time difference.

  As described above, even when the time difference between the right microphone signal Srm and the left microphone signal Slm is used, a sound image at a position other than the front can be realized by simple processing as in the case of using the level difference.

(II) Second Embodiment Next, a second embodiment which is another embodiment according to the present application will be described with reference to FIG. FIG. 8 is a block diagram showing only the schematic configuration of the signal processing unit 40 in the acoustic device SS according to the second embodiment, together with each speaker, amplifier, and D / A converter. The first embodiment shown in FIG. Constituent members that are the same as those of the acoustic device S according to FIG.

  In the first embodiment described above, the audio device S includes six speakers, which are the subwoofer 4W, the center speaker 4C, the right speaker 4R, the left speaker 4L, the surround right speaker 4SR, and the surround left speaker 4SL as the actual speakers. However, in the second embodiment described below, four speakers, that is, the subwoofer 4W, the center speaker 4C, the right speaker 4R, and the left speaker 4L are included as actual speakers. The case where this application is applied with respect to the sound apparatus SS which it has is demonstrated.

  As illustrated in FIG. 8, the acoustic device SS according to the second embodiment includes a signal processing unit 40 corresponding to the signal processing unit 16 in the acoustic device S according to the first embodiment, and D / A converters 2W, 2R, and 2C. And 2L, amplifiers 3W, 3R, 3C and 3L, a subwoofer 4W, a right speaker 4R, a left speaker 4L, and a center speaker 4C. In this configuration, the right speaker 4 </ b> R and the left speaker 4 </ b> L need to be set at positions symmetrical to the listener M.

  Further, the signal processing unit 40 includes a localization control in addition to the sound field control unit 20 and the localization control unit 21 and the switches 22 to 27 having the same configuration and functions as those of the signal processing unit 16 according to the first embodiment. An adder 28 as a superimposing means for adding the output signal Ssl and the output signal S1 from the unit 21 and outputting to the D / A converter 2L, and adding the output signal Ssr and the output signal Sr from the localization control unit 21 And an adder 29 as superimposing means for outputting to the D / A converter 2R.

  With this configuration, the sounds output from the left speaker 4L and the surround left speaker 4SL in the first embodiment are combined with each other and emitted from the left speaker 4L according to the second embodiment. Similarly, The sounds output from the right speaker 4R and the surround right speaker 4SR in the first embodiment are combined with each other and emitted from the right speaker 4R according to the second embodiment.

  In this state, the sound emission direction θ adjustment process according to the first embodiment is applied to each of the left speaker 4L and the right speaker 4R, and the localization control parameter and the sound field control parameter adjustment process according to the first embodiment, respectively. By applying the above, it is possible to realize a surround sound field similar to that of the acoustic device S according to the first embodiment with only the four speakers according to the second embodiment.

  Thus, according to the operation of the adjustment stage for realizing the surround sound field in the acoustic device SS according to the second embodiment, the adjustment stage for realizing the surround sound field in the acoustic device S according to the first embodiment. In addition to the effect of the above operation, a desired sound field can be realized using a small number of speakers.

(III) Third Embodiment Next, a third embodiment, which is still another embodiment according to the present application, will be described with reference to FIG. FIG. 9 is a block diagram showing only the schematic configuration of the signal processing unit 50 in the acoustic device SSS according to the third embodiment, together with each speaker, amplifier, and D / A converter. The first embodiment shown in FIG. Constituent members that are the same as those of the acoustic device S according to FIG.

  In the second embodiment described above, a case will be described in which the present application is applied to an acoustic device SS including four speakers, a subwoofer 4W, a center speaker 4C, a right speaker 4R, and a left speaker 4L, as actual speakers. However, in the third embodiment described below, a case will be described in which the present application is applied to an acoustic device SSS that includes only two speakers, the right speaker 4R and the left speaker 4L, as actual speakers.

  As shown in FIG. 9, the acoustic device SSS according to the third embodiment includes a signal processing unit 50 corresponding to the signal processing unit 16 in the acoustic device S according to the first embodiment, a D / A converter 2R2L, and an amplifier 3R. And 3L, a right speaker 4R, and a left speaker 4L. In this configuration as well, the right speaker 4R and the left speaker 4L need to be set at positions symmetrical with respect to the listener M.

  In addition to the sound field control unit 20 and the localization control unit 21 and the switches 22 to 27 having the same configuration and functions as those of the signal processing unit 16 according to the first embodiment, the signal processing unit 50 includes localization control. An adder 30 serving as a superimposing means for adding all of the output signal Ssl from the unit 21 and the output signals Sl and Sc and Sw to the D / A converter 2L, and the output signal Ssr and the output signal Sr from the localization control unit 21 , Sc and Sw are all added together, and an adder 31 as superimposing means for outputting to the D / A converter 2R.

  With this configuration, the sounds output from the left speaker 4L, the surround left speaker 4SL, the center speaker 4C, and the subwoofer 4W in the first embodiment are all synthesized with each other to produce the left speaker 4L according to the third embodiment. Similarly, all the sounds output from the right speaker 4R, the surround right speaker 4SR, the center speaker 4C, and the subwoofer 4W in the first embodiment are combined with each other to form the third embodiment. The sound is emitted from the right speaker 4R.

  In this state, the sound emission direction θ adjustment process according to the first embodiment is applied to each of the left speaker 4L and the right speaker 4R, and the localization control parameter and the sound field control parameter adjustment process according to the first embodiment, respectively. By applying the above, it is possible to realize a surround sound field similar to that of the acoustic device S according to the first embodiment with only two speakers according to the third embodiment.

  Thus, according to the operation of the adjustment stage for realizing the surround sound field in the acoustic device SSS according to the third embodiment, the adjustment stage for realizing the surround sound field in the acoustic device S according to the first embodiment. In addition to the effect of the above operation, a desired sound field can be realized by using a smaller number of speakers.

  In each of the above-described embodiments, the configuration in which the speaker main body 35 and the support unit 36 are rotated using the control unit 11 and the rotation unit 37 when changing the sound emission direction θ in each surround speaker has been described. However, other than this, it is of course possible to configure so that the sound emission direction θ is set by a person manually (manually) rotating the surround speaker. In this case, the mechanism for rotation (particularly the rotation unit 37) and control as shown in FIG. 2 are not required in the surround speaker, and a commercially available speaker is used as the surround speaker in each embodiment. The sound emission direction θ according to each embodiment can be used in the adjustment process (steps S10 and S11 in FIG. 4B).

  In addition, the above-described audio device S according to the present application can be applied to, for example, a thin television device including a plurality of speakers or a so-called home theater system.

  Also, programs corresponding to the flowcharts shown in FIGS. 3 to 7 are recorded in an information recording medium such as a flexible disk or a hard disk, or acquired and recorded via the Internet or the like, and these are stored in a general-purpose computer. It is also possible to utilize the computer as the control unit 11 according to each embodiment by reading and executing in step (b).

1 is a block diagram illustrating a schematic configuration of an audio device according to a first embodiment. It is an external appearance perspective view which shows the structure of the speaker in the audio equipment which concerns on a deformation | transformation form. It is a block diagram which shows the detailed structure of the audio equipment which concerns on 1st Embodiment, (a) is a block diagram which shows the detailed structure of the signal processing part in the said audio equipment, (b) is the localization control in the said signal processing part It is a block diagram which shows the detailed structure of a part. It is a flowchart which shows the adjustment operation for the surround sound field realization in the acoustic nest according to the first embodiment, (a) is a flowchart showing the overall operation of the adjustment operation, and (b) is the localization within the adjustment operation. It is a flowchart which shows control operation. It is a flowchart which shows the speaker angle adjustment operation | movement in the adjustment operation for surround sound fields in 1st Embodiment. It is a flowchart which shows the parameter adjustment operation for localization in the adjustment operation for surround sound fields in 1st Embodiment. It is a flowchart which shows the adjustment operation | movement for the surround sound field in 1st Embodiment. It is a block diagram which shows schematic structure of the audio equipment which concerns on 2nd Embodiment. It is a block diagram which shows schematic structure of the audio equipment which concerns on 3rd Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Playback part 4W Subwoofer 4R Right speaker 4L Left speaker 4C Center speaker 4SR Surround right speaker 4SL Surround left speaker 10 Test signal generation part 11 Control part 13 Amplifier 15 Analysis part 16 Signal processing part 20 Sound field control part 21 Localization control part 22 23, 24, 25, 26, 27 Switcher 28, 29, 30, 31, 33l, 33r Adder 30l Left attenuator 30r Right attenuator 31l Left bandpass / delay unit 31r Right bandpass / delay unit 35 Speaker body 37 Rotation Part S, SS, SSS Sound device RM Right microphone LM Left microphone M Listener

Claims (9)

A plurality of speaker means arranged in front of the listener, wherein the pre-adjustment sound emitted from any of the speaker means for emitting a sound whose sound image is to be localized at a position other than the front is the listening And collecting the sound using the right ear sound collecting means disposed at the right ear position of the listener and the left ear sound collecting means disposed at the position of the listener's left ear, respectively. A right ear sound collecting signal corresponding to the pre-adjustment sound is output from the right ear sound collecting means, and a left ear sound collecting signal corresponding to the collected pre-adjustment sound is output from the left ear sound collecting means. A sound collection process,
An adjustment step of adjusting the sound emission direction in any one of the above based on the difference between the output right ear sound collection signal and the left ear sound collection signal;
A generating step of generating control information for controlling the position of the sound image corresponding to each of the speaker means based on the difference;
Based on the control information obtained by executing the sound collection step, the adjustment step, and the generation step for each of the speaker units at the time of actual sound emission from the speaker units, A processing step for processing an output signal corresponding to the sound to be output to each speaker means;
A sound emission step of emitting the sound corresponding to the processed output signal from each of the speaker means;
A sound field control method comprising: A sound collecting device used for carrying out the sound field control method according to claim 1,
The right ear sound collecting means for outputting the right ear sound collecting signal;
The left ear sound collecting means for outputting the left ear sound collecting signal;
Right ear sound collecting means supporting means for supporting the right ear sound collecting means at the position of the right ear;
Left ear sound collecting means supporting means for supporting the left ear sound collecting means at the position of the left ear;
A sound collecting device comprising: A sound field control device provided for implementing the sound field control method according to claim 1,
Control information generating means for generating the control information by executing the generating step;
Processing means for processing the output signals by executing the processing steps;
A sound field control device comprising: A speaker device including each of the speaker means used for carrying out the sound field control method according to claim 1,
A speaker device comprising: changing means for changing the sound emission direction based on a direction control signal output from the sound field control device according to claim 3 based on the difference. In the sound field control device according to claim 3,
A direction control signal generation unit configured to generate a direction control signal for adjusting the sound emission direction so that the difference is maximized, and to output the direction control signal to the speaker device according to claim 4,
The control information generation means, based on the difference, the control information indicating a delay amount for delaying a sound signal corresponding to the sound to be output from each speaker means for each preset frequency band, For each of the speaker means and for each frequency band,
Further, the processing means outputs the output signal to be output to the other speaker means that forms a pair with the one speaker means based on the control information generated by the control information generating means for one speaker means. A sound field control device that is processed and output to the other speaker means. In the sound field control device according to claim 3 or 5,
The sound field control apparatus according to claim 1, wherein the difference is a level difference between the right ear sound collection signal and the left ear sound collection signal corresponding to the same preadjustment sound. In the sound field control device according to claim 3 or 5,
The sound field control apparatus according to claim 1, wherein the difference is a time difference between the right ear sound collection signal and the left ear sound collection signal corresponding to the same pre-adjustment sound. In the sound field control device according to any one of claims 3 and 5 to 7,
Superimposing the processed output signal on the front output signal corresponding to the sound that the sound image should be localized on the front, and outputting the sound on which the sound image should be localized to the front speaker means that should emit the sound The sound field control device further comprising means.   A program for controlling a sound field, which causes a computer to function as the sound field control device according to any one of claims 3 and 5 to 8.

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