JPH11262097A - Method for reproducing sound field - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reproduce a sound field at high precision by reproducing at the same time sound recorded by means of directional microphones, which are arranged in opposite directions through the use of plural loudspeaker arranged in the opposite, directions. SOLUTION: Four directional microphones M1, M2, M3 and M4 are arranged facing different directions which successively differ by 90 deg. in a horizontal direction and sound are simultaneously and independently recorded so that the two-dimensional sound field is recorded. At reproducing, sound recorded by the microphones M1-M4 is reproduced by independent loudspeakers. The reproduction of sound by the four speakers is simultaneously executed, in accordance with the simultaneous recording of sound by the four microphones M1-M4. When six microphones and six speakers are used, three-dimensional sound is recorded and reproduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sound field reproducing method for recording sound in a sound field and reproducing the sound field in another place.

[0002]

2. Description of the Related Art For example, when examining sound fields at various places in detail or experimentally examining the clarity of an announcement in noise, a subject (evaluator) goes to various places. It is difficult to evaluate, and in order to carry various equipment into the place itself for examination, various difficult problems such as trouble of transporting the equipment and obstruction of traffic due to installation of the equipment occur.

Therefore, it has been conventionally considered to reproduce a sound field in a laboratory or an anechoic chamber using a speaker.
OSS is a sound field reproduction method using a conventional speaker.
(Trans-aural system), a multi-speaker system, and the like. The OSS method is a method of receiving sound with a dummy head microphone in which a microphone is attached to a dummy head simulating the shape of a human head, performing special signal processing on the received sound, and reproducing the sound from a 2-channel speaker. is there. In the OSS system, since the sound is reproduced only at a specific position corresponding to the position where the dummy head is placed, the listener must listen in a specific direction at the specific position.

[0004] In the multi-speaker system, a large number of speakers are arranged over almost the entire area of a wall or a ceiling. This is a method of allocating and reproducing to speakers. In the case of the multi-speaker system, a large number of reproduction systems corresponding to a large number of speakers are required.

[0005]

As described above, in the conventional system, it is necessary to limit complicated signal processing and listening position.
Alternatively, it is necessary to use a large number of regeneration systems. The present invention has been made in view of the above circumstances, and has as its object to provide a sound field reproducing method capable of reproducing a sound field with high accuracy only by using a device having a simple configuration.

[0006]

According to the sound field reproducing method of the present invention for achieving the above object, a plurality of directional microphones are set at a predetermined sound collection point in a sound field, and the directional directions of the plurality of directional microphones are set. Sound is recorded simultaneously and independently by these multiple microphones arranged radially, and a plurality of speakers of the same number as the number of the plurality of directional microphones are used. In order to be relatively the same as the directivity direction of the directional microphone, the directional microphone was arranged toward a predetermined sound collection point corresponding to the sound collection point, and recorded by a directional microphone arranged in the corresponding direction. The sound is reproduced by the speakers arranged in the corresponding directions and simultaneously by the plurality of speakers.

Here, in the sound field reproducing method of the present invention, four directional microphones are prepared as the plurality of directional microphones, and these four directional microphones are used.
At the sound collection point, the directional directions of these four directional microphones are arranged in the horizontal direction and sequentially in directions different by 90 °, and the four directional microphones simultaneously
The sound is recorded independently, and four speakers are prepared as the plurality of speakers, and the four speakers are arranged in the horizontal direction and sequentially from different directions by 90 ° toward the sound collection point to correspond to each other. One preferred mode is to play back the sound recorded by the directional microphones arranged in the same direction by the speakers arranged in the corresponding directions and simultaneously by the four speakers.

In the sound field reproducing method of the present invention, six directional microphones are prepared as the plurality of directional microphones, and four directional microphones among the six directional microphones are provided. The four directional microphones are arranged at the sound collection point so that the directional directions of the four directional microphones are horizontally and sequentially different from each other by 90 °, and the remaining two directional microphones of the six directional microphones are arranged. Microphones are arranged at the sound collection point with the directional directions of these two directional microphones facing upward and downward, respectively, and sound is recorded simultaneously and independently with these six directional microphones, Six speakers are prepared as the plurality of speakers, and four of the six speakers are collected in the horizontal direction and sequentially from different directions by 90 °. At the same time, the remaining two speakers of the six speakers were arranged toward the sound collection point from above and below, respectively, and arranged in the corresponding directions. A speaker arranged in the corresponding direction to the sound recorded by the directional microphone,
Simultaneous reproduction with the above-mentioned six speakers is also a preferred embodiment.

In the sound field reproducing method of the present invention, sound is recorded by a plurality of directional microphones whose directional directions are radially directed at the time of sound collection, and the same number of speakers as the number of directional microphones are provided for each direction. Simultaneous playback reproduces the sound at the center of the speaker arrangement (sound collection point), so that the direction in which the listener faces is not limited, and the effect is obtained even if the listening position is slightly off the sound collection point. Less is. In addition, since the recorded content is basically reproduced as it is, there is no need to perform complicated signal processing, and 4-6
Sound field reproduction can be performed with a small number of channels.

[0010]

Embodiments of the present invention will be described below. FIG. 1 is a diagram showing an example of microphone arrangement at the time of sound collection in the sound field reproduction method of the present invention. Here, four directional microphones M1, M2, M3, and M4 change the directional directions of the directional microphones in the horizontal direction and sequentially in nine directions.
They are arranged in different directions by 0 °. This figure 1
In the figure, the dashed-dotted arrows indicate the directional directions of the microphones M1 to M4. It is preferable to arrange these microphones M1 to M4 as close to each other as possible.

Here, these four microphones M1 to M1
M4 is combined with the arrangement shown in FIG. 1, the microphones M1 to M4 are arranged at predetermined sound collecting points in the sound field to be picked up, and the four microphones M1 to M4 are arranged.
4. Simultaneously and independently record sound. FIG. 2 is a diagram showing another arrangement example of microphones at the time of sound collection in the sound field reproduction method of the present invention.

Here, the four microphones M1 to M4 shown in FIG. 1 are arranged in the state shown in FIG. 1, and two directional microphones M5 and M6 are further provided.
These two directional microphones are arranged so that the directional directions of the microphones are directed upward and downward, respectively. It is preferable that the two microphones M5 and M6 directed in the vertical direction are also arranged as close as possible.

These six microphones M1 to M6 are combined in the arrangement shown in FIG.
To M6 are arranged at predetermined sound collecting points in the sound field to be picked up, and the six microphones M1 to M6 simultaneously and independently record sound. Here, the six microphones combined in the arrangement shown in FIG. 2 are referred to as “six-directional microphones”.

As shown in FIG. 1, four microphones M1
When the microphones M1 to M4 are combined, the directions of the four microphones M1 to M4 are all horizontal, so that the sound transmitted from the horizontal to the sound collection point, that is, the two-dimensional sound field is recorded. However, when six microphones M1 to M6 are combined as shown in FIG. 2, a three-dimensional sound field can be recorded.

FIG. 3 is a diagram showing an example of speaker arrangement during sound field reproduction by the sound field reproduction method of the present invention. Here, 4
Speakers Sp. 1, Sp. 2, Sp. 3, Sp. 4
Are arranged in the horizontal direction and sequentially from different directions by 90 ° toward the sound collection point P, and two speakers S
p. 5, Sp. 6 are arranged toward the sound collection point P from above and below, respectively.

These speakers Sp. 1 to Sp. In 6, the sound recorded by the directional microphone arranged in the corresponding direction at the time of sound collection is reproduced simultaneously with the speaker arranged in the corresponding direction. Specifically, when sound is recorded by the four microphones M1 to M4 shown in FIG. 1 at the time of sound collection, the sound recorded by the microphone M1 is reproduced by the speaker Sp. 1 and the microphone M2
The sound recorded by the speaker Sp. 2 and the sound recorded by the microphone M3 is reproduced by the speaker Sp. 3 and the sound recorded by the microphone M4 is Sp. 4 is played. These speakers Sp. 1 to Sp. The reproduction of the sound at 4 is performed simultaneously, corresponding to the simultaneous recording of the sound by the four microphones M1 to M4. Here, since four microphones M1 to M4 are used at the time of sound collection, four speakers Sp. 1 to S
p. 4 are used. That is, in this case, two upper and lower speakers Sp. Shown in FIG. 5, Sp. 6 is not used for reproduction.

On the other hand, when sound is recorded by the six microphones M1 to M6 shown in FIG. 2 at the time of sound pickup, at the time of reproduction, each sound recorded by the four microphones M1, M2, M3 and M4 is similar to the above. Four speakers Sp. 1, S
p. 2, Sp. 3, Sp. 4 are respectively reproduced and recorded by the two microphones M5 and M6 pointing upward and downward, respectively, and the respective speakers Sp. Are arranged at the upper position and the lower position, respectively. 5, Sp. 6 is played.

By configuring the sound collection system and the reproduction system as described above, it is possible to reproduce the sound field with a simpler device configuration than the conventional one, and satisfactorily as shown in the experimental results described later.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The results of experiments using the sound field reproducing method of the present invention will be described below. In each of the following experiments, sound was collected using four or six directional microphones arranged in the directions shown in FIGS. 1 and 2 and the distance between the microphones was set to 15 cm. In the speaker arrangement shown in FIG. 3, the speakers were arranged as shown in FIGS. 4 and 5 to reproduce the sound field.

FIGS. 4 and 5 are a plan view and an elevation view, respectively, showing the speaker arrangement during sound field reproduction. Here, the collected six-channel sound is reproduced from the six-channel speakers in the anechoic room. The spacing of the speakers in the horizontal plane is
The distance from the center of the reproduction sound field (sound collection point) is 1.6 m.
m (the height of the center of the speaker installed in the horizontal plane is 1.1 m from the floor), each speaker is arranged at a distance of 1.6 m from the center.

(Experiment 1) Sound collection was performed in an anechoic room in order to examine the simulation accuracy of the sound collection / reproduction system using a six-way microphone with respect to the incident direction of the sound at the time of sound collection. Here, since the study was performed with the incident direction of the sound limited to the horizontal plane, the sound was collected using a four-channel microphone as shown in FIG. 1 (the four-channel microphone excluding the microphones above and below the six-directional microphone). Microphone). The sound was collected by radiating a sweep pulse from a YAMAHA-10M speaker and rotating the 6-way microphone by 15 degrees (0 to 75 degrees) at a point 7 m away. The measurement system at this time is shown in FIG. Sp. Denotes a speaker and M denotes a microphone.

The collected four-channel data was reproduced using four-channel (excluding upper and lower) speakers in the anechoic chamber, and received using an omnidirectional microphone installed at the center position. The reproduced conditions are six conditions in which sound was collected (the sound source direction was set every 15 degrees from 0 to 75 degrees). FIG. 7 shows a reproduction system and a measurement system. As an example, FIG. 8 shows a sound collection / reproduction system when the direction of the sound source is set to 0 degrees.

FIG. 9 shows the result of the sound pressure level in the sound field where each condition is reproduced. From FIG. 9, in the frequency band from 125 Hz to 1 kHz, the sound collection / reproduction system of the six-way microphone does not depend on the arrival direction of the sound (set sound source direction).
A fairly good simulation accuracy can be secured.
In the high-frequency range of 1 kHz or more, the frequency characteristics of the simulated sound field vary depending on the direction of arrival of the sound. This is because it is desired that the microphones of the sound collection system be ideally concentrated at one point, Is limited to the size of the microphone, here the microphone is 15cm
This is probably due to the arrangement at intervals. By reducing the microphone interval, it is possible to perform accurate simulation up to a higher sound range.

(Experiment 2) 4 collected in the above (Experiment 1)
Four-channel impulse responses were determined from the sweep pulse responses of the channels. Using a real-time convolver (real-time convolution computer), each of the impulse responses was convolved with pink noise and reproduced from a 4-channel speaker. The playback condition is 0 to 33
There are 24 conditions set every 15 degrees up to 0 degrees. At the center position, sound was received using an omnidirectional microphone, and the sound pressure level was measured. The intensity (two-dimensional) was also measured. FIG. 10 shows a reproduction system and a measurement system. Here, the equalizer corrects the frequency characteristics of the sound source speaker (YAMAHA-10M) during sound pickup.

FIG. 11 shows frequency characteristics in each simulated sound field in which the sound source direction is set every 15 degrees from 0 to 75 degrees. FIGS. The measurement results of the two-dimensional intensity in each simulated sound field set in
Vectors are shown for each octave band from 50 Hz to 1 kHz. In FIGS. 12 to 14, outer numbers indicate the set sound source directions, and vectors indicate the sound source directions measured in the simulated sound field. It is desirable that the direction of the vector coincides with the sound source direction set at the time of sound collection indicated by the dotted line in the figure.

In FIG. 11, as in the case where the data of 6 channels is reproduced as it is (see FIG. 9), the variation of the sound pressure level in each simulation sound field in which the sound source direction is set every 15 degrees is small up to the 1 kHz band. ,
The variation is large in the band of 2 kHz or more. Note that the frequency characteristics shown in FIG. 11 correspond to the sound source speaker (Y
AMAHA-10M)
Although different from the frequency characteristic shown in FIG. 9, the variation in sound pressure level due to the reproduced condition is almost the same.
Very good simulation accuracy is obtained in the following frequency bands. From these results, it can be seen that the simulation sound field by the method of reproducing the collected 6-channel data as it is and the simulation sound field by the reproduction method of convolving the impulse response and the dry source (anechoic sound) have almost the same simulation accuracy. Can be expected to be obtained. Here, the results from 0 degrees to 75 degrees are shown, but other simulation sound fields (from 90 degrees to 3 degrees)
Similar results are obtained for 18 conditions for every 15 degrees up to 45 degrees).

In FIGS. 12 to 14, 1 kHz
Although there is a slight difference between the sound source direction set in step 2 and the sound source direction measured in the simulated sound field, the order of every 30 degrees is not interchanged, and as a whole, the intensity vector is almost the same as the set sound source direction. It is considered to indicate. Here, the measurement results of the intensity of the sound field simulated every 30 degrees from 0 to 330 degrees are shown, but the results of the sound field simulated every 30 degrees from 15 degrees to 345 degrees are almost the same. Has been obtained.

(Experiment 3) In a sound field having a certain degree of reflection, such as a hall sound field, the sound pickup of a six-way microphone
A simulation using a reproduction system was performed, and its accuracy was examined. Sound was collected in the hall sound field (Omiya Sonic City, large hall, approximately 2,500 seats). A sweep pulse is emitted from a dodecahedral speaker installed on the stage, and two measurement points (M
1: Central floor aisle, M2: Upper floor on the upper side of the rear block)
And sound was collected by a six-way microphone. In order to correct the sound collection system, the impulse responses of six channels were obtained from the sweep pulse responses of the six channels on which sound was collected, and reproduced in an anechoic room to perform a simulation. The sound was received using an omnidirectional microphone installed at the center of the simulation sound field, and the impulse response of the simulation sound field was obtained. From these results, the reverberation time and various auditory physical quantities were calculated. In FIG.
The regeneration system and the measurement system are shown. The direction indicated by the thick arrow in the figure is the sound source direction at the time of sound collection (hall sound field).

FIGS. 16 to 22 and FIGS. 23 to 29
The impulse response waveform (RMS) at each measurement point (M1: 1st floor central passage, M2: 1st floor upper block center)
FIG. 30 shows a comparison between the actual sound field and the simulated sound field, and FIG.
FIGS. 1 to 33 show D values and C as examples of auditory physical quantities, respectively.
The results of the value and Ts (time center of gravity) are shown by comparing the actual sound field and the simulated sound field. 16 to 22 and FIG.
29, the upper waveform is the actual sound field, and the lower waveform is the simulation sound field, as shown in FIGS. 30 to 33, the results indicated by circles are the measurement results in the actual sound field, and the results indicated by triangles are the measurement results in the simulated sound field.

FIGS. 16 to 22 and FIGS. 23 to 29 show that even in the band of 2 kHz or higher, it is considered that the simulation accuracy equivalent to the band of 1 kHz or lower cannot be obtained in the examination of sound collection and reproduction in the acoustic room. It can be confirmed that the impulse response waveforms of the actual sound field and the simulated sound field show a good correspondence. Further, in FIG. 30, the reverberation times of the two measurement points both agree well with the reverberation time of the actual sound field. From FIGS. 31 to 33, the auditory physical quantities (D value, C
Values, Ts) can be confirmed to correspond well.

(Experiment 4) In order to examine the simulation sound field by subjective evaluation, 12
Directional localization experiments in a horizontal plane were performed in a simulated sound field in an anechoic chamber with sound sources set in different directions. This time,
Since the study was performed in the horizontal plane, sound collection and reproduction were performed in a four-channel (excluding upper and lower) system. (Experiment 1)
At the time of simulation accuracy with respect to the direction of arrival of the sound at, the impulse response under 12 conditions in which sound was collected in an anechoic chamber was used, and pink noise for a duration of 1 second was convoluted with this to make a test sound. At the time of the experiment, pink noise was presented three times under one condition, and judgment was required. They were asked to answer "the direction in which the sound source seems to be", and they were free to move their head when making the answer. In addition, the number tags from 0 to 11 are erected in the 12 directions in which the sound source directions are set,
I was asked to answer with that number. The experiment was conducted with seven subjects as subjects.

FIG. 34 shows a reproduction system of the experimental sound field. In the drawing, the experiment was performed with the direction of the arrow being the front (0 degree direction). FIG. 35 shows a summary of the results of the seven subjects. The horizontal axis indicates the set sound source direction (represented by the number from 0 to 11), and the vertical axis indicates the direction in which the subject answered. Judgment is hardly seen.

In the physical examination performed in (Experiment 1), the simulation accuracy was examined every 15 degrees,
Approximately the same accuracy was obtained in the simulation sound field at every 30 degrees from 15 degrees and every 15 degrees to 30 degrees, and the same direction localization experiment was performed with all the sound collection and reproduction systems rotated by 45 degrees. Was. FIG. 36 shows a reproduction system of the experimental sound field. In the figure, the experiment was performed with the direction of the arrow facing the front (0 degree direction).

FIG. 37 collectively shows the results of the direction localization experiment by the reproduction system 2 rotated by 45 degrees for seven persons. In this system, there is a speaker in front of the subject and the sound source is also set at the speaker position, so the answer tends to be biased toward the speaker position due to visual reasons. I can't see it. From the above (Experiment 1) to (Experiment 4), it is understood that the sound field reproduction method of the present invention can reproduce a sound field with high accuracy.

[0035]

As described above, according to the present invention,
The sound field can be reproduced with high accuracy with a simple device configuration.

[Brief description of the drawings]

FIG. 1 is a diagram showing an example of microphone arrangement at the time of sound collection in a sound field reproduction method according to the present invention.

FIG. 2 is a diagram showing another example of arrangement of microphones at the time of sound collection in the sound field reproduction method of the present invention.

FIG. 3 is a diagram showing an example of speaker arrangement during sound field reproduction according to the sound field reproduction method of the present invention.

FIG. 4 is a plan view showing a speaker arrangement during sound field reproduction.

FIG. 5 is an elevation view showing a speaker arrangement at the time of sound field reproduction.

FIG. 6 is a measurement system diagram of Experiment 1.

FIG. 7 is a diagram showing a regeneration system and a measurement system of Experiment 1.

FIG. 8 is a diagram illustrating a sound collection-reproduction system when the sound source direction is set to 0 degrees in Experiment 1.

FIG. 9 is a diagram illustrating a result of a sound pressure level in a reproduction sound field of Experiment 1.

FIG. 10 is a diagram showing a reproduction system and a measurement system in Experiment 1.

FIG. 11 is a diagram illustrating frequency characteristics in each simulated sound field in which each direction is set from 0 degree to 75 degrees at every 15 degrees.

FIG. 12 is a diagram illustrating a measurement result of a two-dimensional intensity of 250 Hz in each simulation sound field in which the sound source direction is set to 12 directions every 0 to 30 degrees.

FIG. 13 is a diagram showing a measurement result of a two-dimensional intensity of 500 Hz in each simulation sound field in which the sound source direction is set to 12 directions every 0 to 30 degrees.

FIG. 14 is a diagram illustrating 2 of 1 kHz in each simulation sound field in which the sound source direction is set to 12 directions every 0 to 30 degrees.
It is a figure showing a measurement result of dimension intensity.

FIG. 15 is a diagram showing a regeneration system and a measurement system in Experiment 3.

FIG. 16 shows an impulse response waveform (R
FIG. 3 is a diagram showing an MS detection waveform and a time constant of 1 ms by comparing an actual sound field and a simulated sound field.

FIG. 17 shows an impulse response waveform (R
FIG. 3 is a diagram showing an MS detection waveform and a time constant of 1 ms by comparing an actual sound field and a simulated sound field.

FIG. 18 shows an impulse response waveform (R
FIG. 3 is a diagram showing an MS detection waveform and a time constant of 1 ms by comparing an actual sound field and a simulated sound field.

FIG. 19 shows an impulse response waveform (R
FIG. 3 is a diagram showing an MS detection waveform and a time constant of 1 ms by comparing an actual sound field and a simulated sound field.

FIG. 20 shows an impulse response waveform (R
FIG. 3 is a diagram showing an MS detection waveform and a time constant of 1 ms by comparing an actual sound field and a simulated sound field.

FIG. 21 shows an impulse response waveform (R
FIG. 3 is a diagram showing an MS detection waveform and a time constant of 1 ms by comparing an actual sound field and a simulated sound field.

FIG. 22 shows an impulse response waveform (R
FIG. 3 is a diagram showing an MS detection waveform and a time constant of 1 ms by comparing an actual sound field and a simulated sound field.

FIG. 23 shows an impulse response waveform (R
FIG. 4 is a diagram showing a comparison between an actual sound field and a simulated sound field for an MS detection waveform and a time constant of 1 ms.

FIG. 24 shows an impulse response waveform (R
FIG. 4 is a diagram showing a comparison between an actual sound field and a simulated sound field for an MS detection waveform and a time constant of 1 ms.

FIG. 25 shows an impulse response waveform (R
FIG. 4 is a diagram showing a comparison between an actual sound field and a simulated sound field for an MS detection waveform and a time constant of 1 ms.

FIG. 26 shows an impulse response waveform (R
FIG. 4 is a diagram showing a comparison between an actual sound field and a simulated sound field for an MS detection waveform and a time constant of 1 ms.

FIG. 27 shows an impulse response waveform (R
FIG. 4 is a diagram showing a comparison between an actual sound field and a simulated sound field for an MS detection waveform and a time constant of 1 ms.

FIG. 28 shows an impulse response waveform (R
FIG. 4 is a diagram showing a comparison between an actual sound field and a simulated sound field for an MS detection waveform and a time constant of 1 ms.

FIG. 29 shows an impulse response waveform (R
FIG. 4 is a diagram showing a comparison between an actual sound field and a simulated sound field for an MS detection waveform and a time constant of 1 ms.

FIG. 30 is a diagram showing a result of reverberation time by comparing a real sound field and a simulated sound field.

FIG. 31 is a diagram showing a D value as an example of an auditory physical quantity by comparing an actual sound field and a simulated sound field.

FIG. 32 is a diagram showing a C value as an example of an auditory physical quantity by comparing a real sound field and a simulated sound field.

FIG. 33 shows Ts (time center) as an example of an auditory physical quantity.
FIG. 3 is a diagram showing a comparison between a real sound field and a simulation sound field.

34 is a reproduction system diagram of an experimental sound field in Experiment 4. FIG.

FIG. 35 is a view showing an experimental result in Experiment 4.

FIG. 36 is a reproduction system diagram of an experimental sound field in Experiment 4.

FIG. 37 is a view showing an experimental result in Experiment 4.

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Shinichi Sakamoto 1-1-7 Midoricho, Tanashi-shi, Tokyo 1-1-2 Tadashi No. 2 staff dormitory 1-1101 (72) Inventor Sakae Yokoyama 1066, Kanamori, Machida-shi, Tokyo (72) Inventor Hikari Mukai 1-16-1 Hakusan, Midori-ku, Yokohama-shi, Kanagawa-ken Ono Sokki Co., Ltd.

Claims (3)

[Claims] 1. A plurality of directional microphones are arranged at predetermined sound-collecting points in a sound field such that the directional directions of the plurality of directional microphones are radially directed, and sound is simultaneously and independently received by the plurality of microphones. Recorded, a plurality of speakers of the same number as the number of the plurality of directional microphones, such that the direction of the plurality of speakers is relatively the same as the direction of the plurality of directional microphones at the time of sound collection, Arranged toward a predetermined sound collection point corresponding to the sound collection point, sound recorded by a directional microphone arranged in a corresponding direction, a speaker arranged in a corresponding direction, and the plurality of A sound field reproduction method characterized in that reproduction is performed simultaneously with a speaker. 2. The method according to claim 1, wherein the plurality of directional microphones include four directional microphones.
A plurality of directional microphones are prepared, and these four directional microphones are arranged at the sound collection point such that the directional directions of the four directional microphones are horizontally and sequentially different from each other by 90 °. Sound is recorded simultaneously and independently by these four directional microphones, and four speakers are prepared as the plurality of speakers, and the four speakers are collected from different directions in a horizontal direction and sequentially by 90 °. A sound recorded by a directional microphone arranged in a corresponding direction, which is arranged toward a sound point, is reproduced by a speaker arranged in a corresponding direction, and simultaneously by the four speakers. The sound field reproduction method according to claim 1, wherein 3. The method according to claim 1, wherein the plurality of directional microphones are six.
A plurality of directional microphones are prepared, and four directional microphones of the six directional microphones are set to the sound collection point by changing the directional directions of the four directional microphones horizontally and sequentially by 90 °. And the other two directional microphones of the six designated microphones are placed at the sound collection point,
The directional directions of these two directional microphones are arranged in the upward and downward directions, respectively, and sound is recorded simultaneously and independently by these six directional microphones, and six speakers are used as the plurality of speakers. And the four speakers of the six speakers are arranged in the horizontal direction and sequentially from different directions by 90 ° toward the sound collection point, and the remaining two speakers of the six speakers are arranged. Two speakers are arranged from the upper direction and the lower direction toward the sound collection point, respectively, and the sound recorded by the directional microphone arranged in the corresponding direction is a speaker arranged in the corresponding direction, and The sound field reproducing method according to claim 1, wherein the sound is reproduced simultaneously by the six speakers.