JP2013207515A - Acoustic system, recording device and acoustic playback device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reproduce an original acoustic field in a playback acoustic field regardless of a sound source position in the original acoustic field.SOLUTION: An acoustic system comprises a playback processor 201, an amplifier 202, and speakers 204 and 205 which are installed within a playback acoustic field 203 while changing the distance from a listener 208. Signals inputted to microphones installed in positions corresponding to the speakers 204 and 205 in an original acoustic field are played back from the speakers 204 and 205. The playback processor 201 estimates a sound source position in the original acoustic field from the signals inputted to the microphones installed within the original acoustic field, and changes signal levels outputted from the speakers 204 and 205 in accordance with the estimated sound source position.

Description

  In the present invention, in order to reproduce another original sound field (for example, a concert hall) in a reproduction sound field (for example, a listening room or a vehicle room), a sound recorded by a microphone installed in the original sound field is supported by the microphone. The present invention relates to an acoustic system, a recording device, and an acoustic reproduction device that are used for reproduction with a speaker installed in a reproduction sound field.

  As a conventional acoustic system, recording device, and sound reproducing device, the length of the wavelength of the maximum spatial frequency component to be sampled in the spatial distribution of the amplitude of sound waves in the plane in which the microphones are arranged is less than or equal to half the wavelength It has a microphone group arranged at intervals, arranged in the same positional relationship as the microphone group, and a speaker group connected to reproduce sound collected by a corresponding microphone by a speaker at a position corresponding to each microphone. Those are known (for example, see Patent Document 1).

  Further, as another conventional acoustic system, recording device, and sound reproduction device, a group closer to the front three-dimensional sound field is collected by the first sound collecting means and the front three-dimensional sound field is relatively The far group is collected by the second sound collecting means, and the audio signal collected by the first sound collecting means is reproduced by the first reproducing means arranged at a relatively close position in front of the listener. In addition, there is known a configuration in which the audio signal collected by the second sound collecting means is reproduced by the second reproducing means arranged at a relatively far position in front of the listener (for example, Patent Document 2). reference).

Japanese Patent Laid-Open No. 2-114799 Japanese Patent Laid-Open No. 11-178090

  However, in the conventional sound system, recording device, and sound reproduction device, the directivity of the microphone installed in the original sound field is directed in the opposite direction to the listener, so that the sound source is between the listener and the microphone in the original sound field. Sometimes, there is a problem that the sound from the sound source cannot be reproduced in the reproduction sound field.

  In addition, when a microphone is placed close to the listener to reproduce a sound source close to the listener in the original sound field in the playback sound field, the speaker position in the playback sound field corresponding to the microphone is also close to the listener, and the listener There is also a problem that a sufficient sense of distance cannot be obtained for the sound of the sound source located far from the sound source.

  The present invention has been made in view of such points, and an acoustic system, a recording apparatus, and an acoustic reproduction that can reproduce an original sound field in a reproduced sound field regardless of the positional relationship between the listener and the sound source in the original sound field. An object is to provide an apparatus.

  In order to solve this problem, the acoustic system of the present invention is arranged with directivity directed in the direction opposite to the listening position in order to record sound from a sound source far from the listening position assumed in the original sound field. A recording apparatus comprising: a first microphone; and a second microphone arranged with directivity directed in a direction opposite to the listening position in order to record sound from a sound source at a position close to the listening position in the original sound field. And a first sound source that reproduces sound recorded by the first microphone with a directivity opposite to the directivity of the first microphone. And a speaker corresponding to the second microphone in the reproduction sound field, directing the directivity in the direction opposite to the directivity of the second microphone, A second speaker that reproduces sound recorded by an microphone, a first multiplier that changes an output level of the first speaker, and a second multiplier that changes an output level of the second speaker; The structure which comprises the sound reproduction apparatus which has this. With this configuration, the sense of distance can be enhanced by changing the coefficient of the first multiplier or the second multiplier according to the position of the sound source in the original sound field.

  According to the present invention, a microphone is installed at different distances from the listener in the original sound field, and the sound recorded by the microphone is reproduced from a speaker in a reproduction sound field installed corresponding to each microphone position, The output level of the speaker can be changed according to the position of the sound source in the original sound field, so that the original sound field can be reproduced in the reproduced sound field regardless of the positional relationship between the listener and the sound source in the original sound field. Can provide an audio system, a recording apparatus, and an audio reproduction apparatus.

Configuration block diagram of recording device in acoustic system according to Embodiment 1 of the present invention 1 is a configuration block diagram of a sound reproducing device in a sound system according to Embodiment 1 of the present invention. The block diagram which shows the structural example of the reproduction | regeneration processor shown in FIG. Configuration block diagram of an acoustic system according to Embodiment 2 of the present invention The block diagram which shows the structural example of the sound field characteristic processor shown in FIG. Block diagram showing the configuration of the FIR filter shown in FIG.

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

(Embodiment 1)
FIG. 1 is a configuration block diagram of a recording device in an acoustic system according to Embodiment 1 of the present invention. FIG. 2 is a configuration block diagram of the sound reproducing device in the sound system according to the first embodiment of the present invention. That is, the sound system according to the first embodiment basically includes the recording device 100 shown in FIG. 1 and the sound reproduction device 200 shown in FIG. 1 and 2 show an example in which a recording / reproducing device 106 is interposed between both apparatuses as a specific configuration example.

  In FIG. 1, a recording apparatus 100 includes a plurality of microphones 102 (a-1 to an) and a plurality of microphones 103 (b-1 to bm) installed in an original sound field 101, a microphone 102, and a microphone. And an amplifier 104 that amplifies the acoustic signal in the original sound field 101 recorded in 103. Output terminals 105 (a-1 to an, b-1 to bm) of the amplifier 104 are output terminals of the recording apparatus 100.

  In FIG. 1, the output terminals 105 (a-1 to a-n, b-1 to b-m) of the amplifier 104 are connected to the input terminals (identification code omitted) of the recording / reproducing device 106, and the microphone 102 (a -1 to a-n), the case where the sound signal in the original sound field 101 recorded by the microphone 103 (b-1 to b-m) is recorded in the recording / reproducing device 106 is shown.

  Here, the original sound field 101 is, for example, a concert hall. For the sake of explanation, assuming that the listener 109 is at a predetermined position in the original sound field 101, it is assumed that the sound source A 107 is at a distance far from the listener 109 and the sound source B 108 is at a close distance.

  The plurality of microphones 102 (a-1 to a-n) can record directivity between the listener 109 and the sound source A107 in a direction opposite to the listener 109, that is, mainly the sound of the sound source A107. Are arranged as follows. The sound signal of the sound source A 107 recorded by the microphone 102 (a-1 to a-n) is amplified by the amplifier 104 and recorded in the recording / reproducing device 106.

  On the other hand, the plurality of microphones 103 (b-1 to bm) direct the directivity between the listener 109 and the sound source B108 in the opposite direction to the listener 109, that is, mainly the sound of the sound source B108. It is arranged so that it can be recorded. The sound signal of the sound source B109 recorded by the microphone 103 (b-1 to bm) is amplified by the amplifier 104 and recorded in the recording / reproducing device 106.

  The number of microphones 102 and microphones 103 can be improved by increasing the number of microphones 102 and 103. However, since the system scale increases, the effect and the system scale are determined.

  Next, in FIG. 2, the sound reproduction apparatus 200 includes a reproduction processor 201, an amplifier 202, a plurality of speakers 204 (a-1 to a− n) and a plurality of speakers 205 disposed in the reproduction sound field 203. (B-1 to bm). Input terminals 206 (a-1 to an, b-1 to bm) of the playback processor 201 are input terminals of the sound playback device 200.

  In FIG. 2, the input terminals 206 (a-1 to a-n, b-1 to b-m) of the playback processor 201 are connected to the output terminals (identification code omitted) of the recording / playback device 106, and the original sound field In 101, acoustic signals recorded by the microphones 102 (a-1 to a-n) and the microphones 103 (b-1 to b-m) are reproduced by the recording / reproducing device 106 and input to the reproduction processor 201. The case is shown.

  The reproduction sound field 203 is, for example, a listening room or a passenger compartment. In this reproduction sound field 203, the speaker 204 and the speaker 205 are in the same positional relationship as the corresponding microphone 102 and microphone 103, respectively, and are installed with the diaphragm facing away from the directivity of the microphone.

  Specifically, for the sake of explanation, assuming that the listener 208 is at a predetermined position in the reproduction sound field 203, for example, the positional relationship between the plurality of speakers 204 (a-1 to a-n) and the listener 208 1 is the same as the positional relationship between the plurality of microphones 102 (a-1 to an) and the listener 109, and the diaphragm of the speaker 204 (a-1 to an) is directed toward the listener 208 side. Installed.

  In this way, for example, sound emitted from the sound source A 107 in the original sound field 101 in FIG. 1 is input to the microphone 102 (a-1), and the microphone 102 (a-1) and the speaker 204 (a- Since the directivity with respect to 1) is in the opposite direction, if the sound recorded by the microphone 102 (a-1) is reproduced as it is from the speaker 204 (a-2), the sound in the original sound field 101 is reproduced. It can be reproduced in the field 203.

  In order to ensure this, a regeneration processor 201 is provided. The reproduction processor 201 has a configuration shown in FIG. 3, for example, and determines the sound source position in the original sound field 101 from the level of each acoustic signal input from the input terminals 206 (a-1 to an, b-1 to bm). And the level of the sound signal output to the speakers 204 (a-1 to a-n) and the speakers 205 (b-1 to b-m) is individually controlled according to the estimated sound source position, and the amplifier 202 Output to.

  Then, the amplifier 202 amplifies the reproduction signal of the sound signal of the sound source A107 recorded by the microphone 102 (a-1 to an) and outputs the amplified signal to the speakers 204 (a-1 to an). The sound of the sound source A107 is reproduced and output from the speakers 204 (a-1 to a-n) toward the listener 208 side. Further, the amplifier 202 amplifies the reproduction signal of the sound signal of the sound source B108 recorded by the microphone 103 (b-1 to bm) and outputs the amplified signal to the speaker 205 (b-1 to bm). The sound of the sound source B108 is reproduced and output from the speaker 205 (b-1 to bm) toward the listener 208 side.

  Here, consider a case where only the microphone 102 of the microphone 102 and the microphone 103 is installed in the original sound field 101. In this case, the sound of the sound source A 107 is recorded by the microphone 102, but since the directivity of the microphone 102 is directed in the opposite direction to the listener 109, the sound of the sound source B 108 is recorded only as a small sound by the microphone 102. . This is because the volume of recorded sound depends on the directivity characteristics of the microphone. Therefore, in a device in which only the microphone 102 is installed, the sound source B 108 between the microphone 102 and the listener 109 cannot be reproduced in the reproduction sound field 203.

  Next, consider a case where only the microphone 103 is installed in the original sound field 101. In this case, since the directivity of the microphone 103 is directed in the direction opposite to the listener 109, both the sound sources A 107 and B 108 can be recorded by the microphone 103. However, when the distance between the microphone 103 and the listener 109 is short, the distance between the speaker 205 and the listener 208 in the reproduction sound field 203 is also short. In such a case, it is easy to feel the presence of a real sound source (speaker), and it may be difficult to reproduce the sense of distance of the sound source. That is, although the sound from the sound source A 107 and the sound source B 108 is recorded by the microphone 103, there is a possibility that the sense of distance of the sound source A 107 cannot be sufficiently obtained.

  Therefore, in the acoustic system according to the first embodiment, not only the microphone 102 is installed at a position away from the listener position assumed in the original sound field, but the microphone 103 is also installed at a position close to the listener position. Decided to install. With this configuration, not only the sound source A107 at a position far from the listener position but also the sound of the sound source B108 at a position near the listener position can be recorded. In addition, a reproduction processor 201 is provided in order to solve the problem when the distance between the speaker 205 and the listener 208 is short.

  When the sound source position in the original sound field 101 is not known, the reproduction processor 201 estimates the sound source position in the original sound field 101 and the sound source position in the original sound field 101 is known according to the estimated sound source position. In this case, the level of the reproduction sound output from the speaker 204 and the speaker 205 is individually controlled according to the known sound source position.

  1 and 2, the sound recorded by the recording device 100 in the original sound field is temporarily recorded in the recording / reproducing device 106, and the sound reproduced by the recording / reproducing device 106 is reproduced in the reproduction processing device 201 in the sound reproducing device 200. However, the sound reproducing apparatus 200 directly uses the recording apparatus 100 to record the sound recorded by the recording apparatus 100 in the original sound field via a wireless broadcast line, a wired broadcast line, a telecommunication line, or the like. It may be input to the reproduction processor 201. In this case, recording and reproduction can be performed in real time. For example, a sound played in the original sound field 101 can be heard in the reproduction sound field 203 at the same time.

  Next, the configuration and operation of the reproduction processor 201 will be described with reference to FIG. FIG. 3 is a block diagram illustrating a configuration example of the reproduction processor illustrated in FIG. Since there is a case where the recording / reproducing device 106 shown in FIGS. 1 and 2 is not used, in FIG. FIG. 3 shows a configuration when the sound source position in the original sound field 101 is not known.

  In FIG. 3, the reproduction processor 300 includes a plurality of input terminals 304 (a-1 to an, b-1 to bm), a plurality of corresponding output terminals 305, a sound source position estimator 301, A coefficient controller 302, multipliers 303 corresponding to the number of acoustic signals, and multipliers 303 corresponding to the number of acoustic signals are provided. Of the multipliers 303 corresponding to the number of acoustic signals, the multiplier 303 corresponding to the input terminals 304 (a-1 to a-n) corresponds to the first multiplier, and the input terminals 304 (b-1 to b--). m) corresponds to the second multiplier. The acoustic signals input to the input terminals 304 (a-1 to a-n) correspond to the first acoustic signals, and the acoustic signals input to the input terminals 304 (b-1 to b-m) are the first ones. It corresponds to the second acoustic signal.

  The sound source position estimator 301 receives each acoustic signal input to a plurality of input terminals 304 (a-1 to a-n, b-1 to bm), and outputs an estimation result to the coefficient controller 302. . The coefficient controller 302 calculates a coefficient that the multiplier 303 should multiply the acoustic signal based on the estimation result of the sound source position estimator 301. The multiplier 303 multiplies the acoustic signal input from the input terminal 304 by the coefficient from the coefficient controller 302 and outputs the multiplication result from the output terminal 305.

  The reproduction processor 300 may be realized by a digital signal processor (DSP) capable of digital signal processing, a microcomputer, or the like.

  Next, the operation of the reproduction processor 300 configured as described above will be described. An audio signal recorded by the recording / reproducing device 106 or an audio signal recorded by the microphone 102 and the microphone 103 is input to the input terminal 304. An acoustic signal from the input terminal 304 is input to the multiplier 303 and the sound source estimator 301 in parallel.

  The sound source estimator 301 estimates the sound source position in the original sound field 101 from the input signal and notifies the coefficient controller 302 of it. The coefficient controller 302 changes the coefficient given to the multiplier 303 in accordance with the notified sound source position. As a result, the level of the acoustic signal from the input terminal 304 is changed by the multiplier 303 and output from the output terminal 305.

  In the sound source position estimator 301, since the installation positions of the microphone 102 and the microphone 103 are known in advance, the sound source position is estimated from the level difference or delay difference of the acoustic signals recorded by the microphone 102 and the microphone 103.

  For example, the sound from the sound source A 107 has a higher level of sound recorded by the microphone 102 and a smaller delay than the sound recorded by the microphone 103. On the other hand, if the position of the sound source B108 is at an intermediate position between the microphone 102 and the microphone 103, the sound delay from the sound source B108 recorded by the microphone 102 and the microphone 103 is about the same. However, since the directivities of the microphone 102 and the microphone 103 are in the same direction, the sound level from the sound source B108 recorded by the microphone 103 is larger than the sound from the sound source B108 recorded by the microphone 102. . The sound source position can be estimated based on such level difference and delay difference. If the sound source position is known as in the case where a sound is reproduced by placing a speaker at the position of the sound source A 107 or B 108, the sound source position need not be estimated.

  The coefficient changing method given to the multiplier 303 by the coefficient controller 302 according to the sound source position is as follows, for example. When the sound source position estimated by the sound source position estimator 301 is the position of the sound source A 107, the sound from the sound source A 107 is input to both the microphone 102 and the microphone 103, but the listener 109 in the original sound field 101. Therefore, the output level from the speaker 205 close to the listener 208 in the reproduction sound field 203 is reduced. On the other hand, if it is estimated that there is a sound source at the position of the sound source B 108, the sound from the sound source B 108 is not input to the microphone 102 due to the directivity of the microphone 102. Does not change. When the directivity of the microphone 102 is weak and a large amount of sound from the sound source B 108 is input to the microphone 102, the output level from the speaker 204 may be reduced. In addition, although the sound input directly from the sound source B 108 is small to the microphone 102, the sound reflected on the wall of the original sound field 101 is also input, so that the presence of the original sound field 101 is emphasized in the reproduction sound field 203. The playback sound level output from the speaker 204 may be increased conversely.

  By configuring the reproduction processor 300 in this way, even when there is a sound source near an assumed listening position in the original sound field, the original sound field can be reproduced in the reproduced sound field while enhancing the sense of distance.

  In addition, when the example of arrangement | positioning of the speaker 204 (1st speaker) and the speaker 205 (2nd speaker) when the reproduction | regeneration sound field 203 is a vehicle interior is shown, the speaker 204 is arrange | positioned in the wall surface of a vehicle interior, and a speaker 205 is arranged near the listener. Car walls include car doors, ceilings, dashboards, rear trays, and pillars. The vicinity of the listener includes a headrest.

(Embodiment 2)
FIG. 4 is a configuration block diagram of an acoustic system according to the second embodiment of the present invention. In the second embodiment, a configuration example of an acoustic system that reproduces sound of a sound source such as a CD from a speaker in the original sound field and reproduces the original sound field in a reproduced sound field is shown.

  As shown in FIG. 4, the sound system according to the second embodiment includes a sound player 409 instead of the recording device 101 shown in the first embodiment (FIG. 1), and a sound reproducing device 400 according to the second embodiment. Consists of.

  The sound player 409 is a CD player, for example. The sound reproduction device 400 includes a sound field characteristic processor 401, an amplifier 202, a plurality of speakers 204 (a-1 to a-n) and a plurality of speakers 205 (b-1 to b-1) installed in the reproduction sound field 203. bm). An input terminal 408 of the sound reproducing device 400 is an input terminal of the sound field characteristic processor 401 and is connected to an output terminal (identification code omitted) of a sound reproducing device 409 such as a CD.

  Next, the operation of the acoustic system configured as described above will be described. First, it is assumed that the microphones in the original sound field are installed at the positions of the microphone 102 and the microphone 103 in FIG. 1, and the speaker in which the sound player 409 reproduces the sound of the sound source in the original sound field is the position of the sound source A 107 shown in FIG. It is assumed that it is installed in. The source sound signal reproduced by the sound player 409 is input to the sound field characteristic processor 401 through the input terminal 408.

  The sound field characteristic processor 401 performs processing for adding characteristics from the speaker (installed at the position of the sound source A 107) to the microphone 102 and the microphone 103 in the original sound field 101 to the input source sound signal. The characteristics from the speaker to the microphone 102 and the microphone 103 in the original sound field 101 are measured in advance. By adding the characteristics in the original sound field 101 by the sound field characteristic processor 401, the sound is recorded by the microphone 102 from the source sound signal reproduced from the sound player 409 without recording the sound by the microphone 102 and the microphone 103. Acoustic signals (a-1 to an) and acoustic signals (b-1 to bm) recorded by the microphone 103 can be calculated.

  The sound signals (a-1 to a-n, b-1 to b-m) to which the characteristics in the original sound field 101 are added by the sound field characteristic processor 401 are amplified by the amplifier 202, and are reproduced in the reproduced sound field 203. Is reproduced and output from the speaker 204 and the speaker 205 installed to the listener 208 and reaches the listener 208 in the reproduction sound field 203.

  Since the sound source position (speaker position) in the original sound field 101 is known in advance, the reproduction processor 201 shown in FIG. 3 is not provided between the sound field characteristic processor 401 and the amplifier 202, and the amplifier 202 Output level adjustment, that is, level adjustment of the speaker 204 and the speaker 205 is performed in advance.

  FIG. 5 is a block diagram showing a configuration example of the sound field characteristic processor shown in FIG. In FIG. 5, a sound field characteristic processor 401 is connected to a plurality of FIR (Finite Impulse Response) filters 501 in parallel with an input terminal 408, and an output terminal 503 is provided for each FIR filter 501.

  The plurality of FIR filters 501 include, for example, characteristics from each of the plurality of microphones 102 (a-1 to a-n) to the sound source A 107 (reproduction speaker installation), and the plurality of microphones 103 (b-1 to b-m). ) To the sound source A are set.

  The source acoustic signal input from the input terminal 408 is convoluted by the FIR filter 501 with the characteristic from the microphone 102 to the sound source A (impulse response) or the characteristic from the microphone 103 to the sound source A 107 (impulse response). The sound recorded by the microphone 102 and the microphone 103 is calculated and output from the corresponding output terminal 503 to the amplifier 202.

  FIG. 6 is a block diagram showing the configuration of the FIR filter shown in FIG. 6, the FIR filter 501 shown in FIG. 5 includes an input terminal 601, a plurality of delay devices 602 connected in series to the input terminal 601, and a plurality of multipliers 603 whose input terminals are connected to each delay stage. And an adder 604 that receives the outputs of a plurality of multipliers 603 and an output terminal 605.

  The acoustic signal input from the input terminal 601 is delayed by one sample by the delay unit 602, the level is changed by the multiplier 603, added by the adder 604, and then output from the output terminal 605.

  If a value in each sample of the impulse response from the microphone 102 or the microphone 103 to the sound source A 107 is set as a coefficient of the multiplier 603, the output of the FIR filter 501 is the sound reproduced from the sound source A 107 by the microphone 102 or the microphone 103. The sound is recorded.

  The speaker that reproduces and outputs the source sound signal from the sound reproducer 409 such as a CD player in the reproduction sound field 101 has been described as being at the position of the sound source A107, but may be at the position of the sound source B108. The sound source A107 and the sound source B108 may be present.

  Since the acoustic system according to the second embodiment is configured as described above, even when there is a sound source near the listening position assumed in the original sound field, the original sound field can be reproduced in the reproduction sound field, and the CD can be reproduced. When the sound such as is reproduced in the original sound field, the original sound field can be reproduced in the reproduction sound field without being recorded in the original sound field.

  Thus, the sound system, the recording device, and the sound reproducing device according to the present embodiment install a microphone by changing the distance from the listener in the original sound field, and the sound recorded by the microphone corresponds to each microphone position. Therefore, the original sound field can be reproduced in the reproduction sound field regardless of the positional relationship between the listener and the sound source in the original sound field by changing the output level of the speaker according to the position of the sound source. Can be reproduced.

  In addition, in order to reproduce another original sound field in the reproduction sound field, the sound recorded by the microphone installed in the original sound field can be reproduced by the speaker installed in the reproduction sound field corresponding to the microphone.

  The acoustic system, recording apparatus, and acoustic reproduction apparatus of the present invention are an acoustic system, recording apparatus, and acoustic reproduction apparatus capable of reproducing an original sound field in a reproduced sound field regardless of the positional relationship between the listener and the sound source in the original sound field Useful as.

100 Recording Device 101 Original Sound Field 102, 103 Microphone 104, 202 Amplifier 105, 305, 503, 605 Output Terminal 106 Recording / Reproducing Device 107 Sound Source A
108 Sound source B
109, 208 Listener 200, 400 Sound reproduction device 201, 300 Reproduction processor 203 Reproduction sound field 204, 205 Speaker 206, 304, 408, 601 Input terminal 301 Sound source position estimator 302 Coefficient controller 303 Multiplier 401 Sound field characteristic Processor 409 Sound regenerator 501 FIR filter 602 Delay unit 603 Multiplier 604 Adder

Claims (12)

A first microphone arranged with directivity directed in a direction opposite to the listening position in order to record sound from a sound source far from the listening position assumed in the original sound field;
A second microphone arranged in a direction opposite to the listening position in order to record sound from a sound source at a position close to the listening position in the original sound field;
A recording device. A first acoustic signal that records sound from a sound source far from the first listening position assumed in the original sound field and a second acoustic signal that records sound from a sound source near the first listening position And a first speaker that is arranged at a position far from a second listening position assumed in the reproduction sound field and reproduces and outputs the first acoustic signal toward the second listening position;
A second speaker arranged near the second listening position in the reproduction sound field and reproducing and outputting the second acoustic signal toward the second listening position;
A sound reproducing device comprising: A first multiplier for changing the output level of the first speaker by multiplying the first acoustic signal by a coefficient and inputting the coefficient to the first speaker;
A second multiplier for changing the output level of the second speaker by multiplying the second acoustic signal by a coefficient and inputting the coefficient to the second speaker;
A coefficient controller for controlling the coefficient given to the first multiplier and the second multiplier according to a sound source position in the original sound field;
The sound reproducing device according to claim 2, comprising:   The sound reproduction according to claim 3, further comprising a sound source position estimator that estimates a sound source position in the original sound field based on the first sound signal and the second sound signal and outputs an estimation result to the coefficient controller. apparatus.   The coefficient controller increases a coefficient to be given to the first multiplier when the sound source position is far from the recording position of the first acoustic signal when viewed from the first listening position in the original sound field. The sound reproducing device according to claim 3, wherein a coefficient given to the second multiplier is reduced.   The coefficient controller, when the sound source position is between the recording position of the first acoustic signal and the recording position of the second acoustic signal when viewed from the first listening position in the original sound field, The sound reproducing device according to claim 3 or 4, wherein a coefficient given to the first multiplier is reduced or a coefficient given to the second multiplier is increased.   The coefficient controller increases a coefficient given to the first multiplier or a coefficient given to the second multiplier as the distance between the sound source position and the first listening position in the original sound field is closer. And the coefficient given to the first multiplier is reduced or the coefficient given to the second multiplier is increased as the distance between the sound source position and the first listening position in the original sound field is longer. The sound reproducing device according to claim 3 or 4, wherein: The first speaker is installed near at least one of a car door, a ceiling, a dashboard, a rear tray, and a pillar that constitutes a wall surface of the passenger compartment,
The second speaker is installed in the vicinity of the listener in the vehicle interior.
The sound reproducing device according to claim 3 or 4. A recording device according to claim 1;
A recording / reproducing device capable of recording and reproducing the first acoustic signal and the second acoustic signal recorded by the first microphone and the second microphone in the recording device;
The sound reproduction device according to any one of claims 2 to 8, wherein the first sound signal and the first sound signal reproduced by the recording / playback device are input;
An acoustic system comprising: A recording device according to claim 1;
The first acoustic signal and the second acoustic signal recorded by the first microphone and the second microphone in the recording device are input via a wireless broadcast line, a wired broadcast line, and a telecommunication line. The sound reproducing device according to any one of 2 to 8,
An acoustic system comprising: An audio player that reproduces the sound of the sound source in the original sound field;
A sound signal obtained by convolving an impulse response between a sound source at a position far from the first listening position assumed in the original sound field and a sound source at a position close to the source sound signal input from the sound regenerator is the first. A sound reproducing device for reproducing with a speaker and a second speaker,
The first speaker is arranged with a directivity toward the second listening position at a position far from the second listening position assumed in the reproduction sound field,
The second speaker is disposed with a directivity directed toward the second listening position at a position near the second listening position in the reproduction sound field.
Acoustic system. The first speaker is installed near at least one of a car door, a ceiling, a dashboard, a rear tray, and a pillar that constitutes a wall surface of the passenger compartment,
The second speaker is installed in the vicinity of the listener in the vehicle interior.
The acoustic system according to claim 11.

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