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JP2003047088

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DESCRIPTION JP2003047088
[0001]
[Industrial field of application] The present invention is capable of recording and reproducing
three-dimensional sound so that sound source localization in three directions of X direction, Y
direction and Z direction can be known, and recording and reproduction of three-dimensional
sound A microphone device for recording stereophonic sound recording, a stereophonic sound
recording method, and a stereophonic sound recording method capable of easily correcting the
sound source localization in the X direction, the Y direction and the Z direction by adjusting the
sensitivity of the microphone or adjusting the volume. It relates to a sound reproduction method.
[0002]
2. Description of the Related Art Prior art documents relating to inventions capable of recording
three-dimensional sound, inventions capable of reproducing three-dimensional sound, and
inventions capable of recording and reproducing three-dimensional sound include the following
patent publications. JP 2001-029542, JP 2001-025099, JP 2001-134976, JP 11-275697, JP
11-237897, JP 11-187498, JP 11-178090, JP 11-146500, JP 2000-299842, JP-A 10-309000,
JP-A 10-304490, JP-A 10-181593, JP-A 10-174199, JP-A 10-106700, JP-A 10-149491, JP-A
07-236199, JP-A 05- 115098,
[0003]
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1
Among the above-mentioned patent publications, JP-A-10-149491 can be cited as an invention
capable of faithfully recording three-dimensional sound and reproducing the recorded threedimensional sound faithfully. The stereophonic sound recording and reproducing structure of JPA-10-149491 has a structure in which sound is picked up from a microphone in four directions
and recorded on four channels, and sound recorded on four channels is reproduced from four
speakers corresponding to the microphone arrangement. It is a structure. The three-dimensional
sound recording / reproducing structure of JP-A-10-149491 is a related invention closest to the
present invention.
[0004]
SUMMARY OF THE INVENTION In the three-dimensional sound recording and reproducing
structure disclosed in Japanese Patent Application Laid-Open No. 10-149491, four microphones
are directed in the radial direction at four vertex positions of a triangular pyramid whose bottom
face is one triangular surface. It is thought that it is possible to faithfully record threedimensional sound because However, there are the following problems. In order to record a
three-dimensional sound, it is necessary to adjust the sensitivity of the four microphones in a
predetermined order since the four microphones correspond to the front, rear, left, right, upper
and lower in a combined manner. Specifically, first adjust the sensitivity of the front left and right
microphones to be equal, then adjust the sensitivity of the rear microphone to be equal to the
sum of the sensitivity of the front left and right microphones, and then lower It is necessary to
adjust the sensitivity of the upper microphone to be equal to the sum of the sensitivity of the
three microphones on the side. That is, it is difficult to adjust the sensitivities of the front left and
right microphones so that the sum of the sensitivities of the front and rear microphones becomes
equal to the sensitivity of the rear mic after first adjusting the sensitivity of the rear microphones.
is there. Also, it is difficult to adjust the sensitivities of the lower three microphones so that the
sum of the sensitivities of the lower three microphones becomes equal to the sensitivity of the
upper mic after the sensitivity of the upper microphone is adjusted first. is there. Also, with
regard to the playback of the recorded three-dimensional sound, the recorded sound of each
channel when recorded by four channels does not correspond to any of front, rear, left, right,
upper or lower, so it is necessary to perform the volume of four speakers in a predetermined
order is there. Specifically, first adjust the volume of the front left and right speakers to be equal,
then adjust the volume of the rear speakers equal to the sum of the volumes of the front left and
right speakers, and then lower. The volume of the upper speaker needs to be adjusted to be equal
to the sum of the volumes of the three speakers on the side. That is, it is difficult to adjust the
volume of the front left and right speakers so that the sum of the volume of the front left and
right speakers becomes equal to the volume of the rear speakers after first adjusting the volume
of the rear speakers is there. Also, it is difficult to adjust the volume of the lower three speakers
so that the sum of the volume of the lower three speakers is equal to the volume of the upper
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2
speaker after the volume of the upper speakers is adjusted first. is there.
[0005]
The present invention has been devised in view of the above-mentioned points, and can record
and reproduce a three-dimensional sound so that the sound source localization in three
directions of the X, Y and Z directions can be known. Microphone device for recording
stereophonic sound recording, which enables easy correction of sound source localization in the
X, Y and Z directions by adjusting the sensitivity of the microphone or adjusting the volume at
the time of recording and reproduction It aims at providing a method and a three-dimensional
sound reproduction method.
[0006]
SUMMARY OF THE INVENTION According to the first aspect of the present invention, two
microphones are provided at a lower position and in substantially opposite directions, and
another two microphones are provided at an upper position. And the two microphones in the
lower position and the two microphones in the upper position are different by 90 degrees in plan
view and one each in the lower position or the upper position. It is an object of the present
invention to provide a microphone device for three-dimensional sound recording, characterized
in that the microphones and the two microphones at the upper position or the upper position are
vertexes of a substantially equilateral triangle.
[0007]
According to the second aspect of the present invention, there are provided two sound input
terminals of one stereo recording / reproducing apparatus or two sound input terminals of a
multitrack recorder capable of four-channel recording and reproduction. The two microphones in
the lower position of the microphone device are connected by two cords to perform stereo
recording in either the left-right direction or the front-rear direction, and two sound input
terminals of another one of the stereo recording and reproducing devices Alternatively, connect
the remaining two sound input terminals of the multitrack recorder to the two microphones at
the upper position of the three-dimensional sound recording microphone device with two cords,
and record either the other in the front-rear direction or the left-right direction. The present
invention provides a stereophonic sound recording method characterized in that the double
stereophonic recording doubles as the stereophonic recording in the vertical direction.
[0008]
According to the third aspect of the present invention, there are provided two low powers which
are disposed at a low position in either the left-right direction or the front-back direction
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3
centering on the listening position of the reproduced three-dimensional sound and directed to
the listening position. Two high position sides of the position side speaker and two high position
sides which are arranged at a high position away from the listening position of the reproduced
three-dimensional sound in either the left or right direction or the front / back direction and are
high Two cords of sound output terminals of the two low position speakers with two speakers of
a stereo recording / playback device or two sound output terminals of a multitrack recorder
capable of recording and reproducing four channels. It is configured to be connected to perform
reproduction in either the left-right direction or the front-back direction of stereo recording, and
the two sound output terminals of the other stereo recording / reproducing apparatus or the
multi Connect the remaining two sound output terminals of the rack recorder to the sound input
terminals of the two high position speakers with two cords to play back the other stereo
recording in the left-right direction or the front-back direction The present invention provides a
method of reproducing a three-dimensional sound, characterized in that double reproduction
doubles as reproduction of stereo recording in the vertical direction.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a microphone device for
three-dimensional sound recording, a three-dimensional sound recording method, and a threedimensional sound reproduction method according to the present invention will be described
with reference to the drawings.
First, a microphone device for three-dimensional sound recording will be described.
The microphone device comprises a stand 1 and four microphones MR, ML, MF and MB.
In the stand 1, a support 1b is erected on the substrate 1a and the middle of the lower horizontal
weir 1c is fixed to the middle of the support 1b, and the middle of the upper horizontal weir 1d is
fixed to the upper end of the support 1b. The direction is fixed differently.
Two microphones MR and ML are provided at substantially opposite directions at both ends of
the lower horizontal weir 1c, and two microphones MF and MB are provided at opposite ends of
the upper horizontal weir 1d. ing.
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[0010]
The lower horizontal weir 1c and the upper horizontal weir 1d are respectively divided into two
halves, and are screwed or connected to the cruciform socket 1e and the T-shaped socket 1f fixed
to the support 1b, or the support 1b Preferably, they are foldably connected to each other.
[0011]
Since the lower horizontal weir 1c and the upper horizontal weir 1d are 90 degrees apart in the
planar direction, the two microphones MR, ML in the lower position and the two microphones
MF, MB in the upper position are When viewed in the plane direction, they differ by 90 degrees.
And, as for the separated positions of the four microphones MR, ML, MF, and MB, the distance
between the lower horizontal weir 1c and the upper horizontal weir 1d is a required dimension,
and the vertex arrangement of the regular tetrahedron (= regular triangular pyramid) It is
preferable that The two microphones MR and ML may generally face in opposite directions. The
two microphones MF and MB may also be generally facing in opposite directions. In particular,
when the four microphones MR, ML, MF, MB are directed in the radial direction, that is, the lower
two microphones MR, ML are inclined at 45 degrees and face each other, and the upper side The
two microphones MF and MB are inclined at 90 degrees and face each other, and the line
connecting the two microphones MR and ML and the line connecting the two microphones MF
and MB in the upper position are in the planar direction Even when the directions of the four
microphones MR, ML, MF, and MB are radially directed and supported on the stand 1 so as to
cross 90 degrees as viewed, "the two microphones are in the lower position. And having two
other microphones at the upper position and facing in substantially the opposite direction, and
including them in the expression ".
[0012]
Next, an embodiment of the three-dimensional sound recording method will be described. This
three-dimensional sound recording method uses the above-described three-dimensional sound
recording microphone device A and two stereo recording and reproducing devices 2 and 5 (or a
multi-track recorder (not shown) capable of four-channel recording and reproduction). It is a
method of performing double stereo recording. More specifically, two sound input terminals R1
and L1 of one stereo recording / reproducing apparatus 2 (or two sound input terminals of a
multi-track recorder not shown) are used as two microphones MR below the above microphone
device A. , ML by two cords 3 and 4 to perform stereo recording on the media 2 a in the left-right
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5
direction (or in the front-rear direction), and two sounds of another one of the stereo recording
and reproducing devices 5 The input terminals F1 and B1 (or the remaining two sound input
terminals of the multitrack recorder) are connected to the two microphones MF and MB at the
upper position of the microphone device A by two cords 6 and 7 to the media 5a. Perform stereo
recording in the front-rear direction (or in the left-right direction). In this way, double stereo
recording (or four-channel recording) will also serve as stereo recording in the vertical direction.
[0013]
Next, an embodiment of a three-dimensional sound reproducing method will be described. This
three-dimensional sound reproduction method includes a stereo recording / reproducing device
2, 5 (or a multi-track recorder (not shown) capable of recording and reproducing four channels
on one recording medium) capable of recording and reproducing two channels on one recording
medium and four speakers SR. , SL, SF, SB to perform double stereo recording in the front-rear
direction and the left-right direction. More specifically, for example, two low positions disposed
at low positions of the chamber wall and away from the listening position as the approximate
center position of the hole K is separated from the listening position as the listening position of
the reproduced three-dimensional sound. Side speakers SR and SL, and two high position side
speakers SF and SB arranged at high positions of the room wall and facing away from the
listening position of the reproduced three-dimensional sound in the direction of the listening
position. Two sound output terminals R2 and L2 of one stereo recording and reproducing
apparatus 2 (or two sound output terminals of a multitrack recorder) and two cords 8 at the
sound input terminals of the two lower position speakers SR and SL , 9 connected to reproduce
the stereo recording in the left and right direction, and two sound output terminals F2 and B2 of
another stereo recording and reproducing device 5 (or two sound outputs of the multitrack
recorder) Two terminals) High position side speaker SF, and performs reproduction of front-rear
direction of the stereo recording are connected by cord 10, 11 of the two sound input terminal of
the SB. Thus, when the stereo reproduction sound in the left and right direction is made to flow
to the listener H from the low position in the left and right direction, and the stereo reproduction
sound in the front and rear direction is made to flow to the listener H from the high position in
the front and rear direction. Can also listen to stereo playback sound in the vertical direction.
[0014]
Although not shown, the sensitivities of the microphones MR, ML, MF and MB are individually
adjusted in the above two stereo recording and reproducing machines 2 and 5 (or a multi-track
recorder (not shown) capable of recording and reproducing four channels) Assume that there are
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appropriate number of sensitivity adjustment knobs. Therefore, by adjusting the sensitivity
adjustment knob, the sensitivities of the four microphones MR, ML, MF, and MB can be all
equally adjusted, or the sensitivities of the desired one to three microphones can be adjusted.
Accordingly, the relative sensitivities of the microphones MR and ML can be adjusted, the relative
sensitivities of the microphones MF and MB can be adjusted, and the relative sensitivities of the
microphones MR and ML and the microphones MF and MB can be adjusted. Also, although not
shown, the volume of the speakers SR, SL, SF, and SB can be individually adjusted in the above
two stereo recording and reproducing machines 2 and 5 (or a multi-track recorder (not shown)
capable of recording and reproducing four channels). It is assumed that there is a volume control
knob. Therefore, by adjusting the volume adjustment knob, it is possible to adjust the volume of
all the four speakers SR, SL, SF, SB equally, or to adjust the volume of one to three desired
speakers. Therefore, since the relative volume of the speakers SR and SL can be adjusted, the
sound source localization in the left and right direction can be adjusted, and since the relative
volume of the speakers SF and SB can be adjusted, the sound source localization in the front and
back direction can be adjusted. Since relative volume of SR, SL and the speakers SF, SB can be
adjusted, sound source localization in the vertical direction can be adjusted. In addition, when the
recording switch of the stereo recording / reproducing device 2 is turned on by connecting the
stereo recording / reproducing devices 2 and 5 as required, the recording switch of the stereo
recording / reproducing device 5 is also synchronized and turned on. When the playback switch
of the playback device 2 is turned on, it is preferable that the playback switch of the stereo
recording and playback device 5 is also set to be synchronized on.
[0015]
In the present invention, the two low position microphones MR and ML are reproduced to obtain
stereo recording of the front and back direction with respect to the listener of the stereo sound,
and the two high position microphones MF and MB are reproduced to the stereo The microphone
device A for stereophonic sound recording is positioned to perform stereophonic sound
recording so as to obtain stereophonic recording in the left and right direction with respect to the
listeners of the sound, and two low position side speakers SR for the listener of the stereophonic
sound to be reproduced. , And SL may be used to perform stereo reproduction in the front-rear
direction, and stereo reproduction in the left-right direction may be performed using the two
high position speakers SF and SB.
[0016]
In the above embodiment, although two stereo recording and reproducing machines 2 and 5 are
shown in the drawing, in this case, two recording media are provided, and the stereo recording
and reproducing machine reproduces three-dimensional sound. Will be two.
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Therefore, it is preferable to use a multitrack recorder capable of four-channel recording and
reproduction on one recording medium.
[0017]
According to the microphone device for recording three-dimensional sound recording, the threedimensional sound recording method, and the three-dimensional sound reproduction method of
the present invention, sound source localization in three directions of X direction, Y direction and
Z direction is possible. As you can see, 3D sound can be recorded and reproduced, and when
recording and reproducing 3D sound, correction of sound source localization in 3 directions of X
direction, Y direction and Z direction is possible by adjusting sensitivity of microphone or
adjusting volume of speaker It can be done easily. More specifically, by adjusting the sensitivity
of the two microphones in the X direction or adjusting the volume of the two speakers in the X
direction, correction of the sound source localization in the X direction can be performed without
significantly affecting the sound source localization in the Y direction. Also, by adjusting the
sensitivity of the two microphones in the Y direction or adjusting the volume of the two speakers
in the Y direction, correction of the sound source localization in the Y direction can be performed
without significantly affecting the sound source localization in the X direction. By relative
adjustment of the sensitivity adjustment of two microphones in the X direction and the sensitivity
adjustment of two microphones in the Y direction, or the volume adjustment of two speakers in
the X direction and the volume adjustment of two speakers in the Y direction. By performing
relative processing, correction of sound source localization in the Z direction can be easily
performed. A microphone device for recording three-dimensional sound recording, a threedimensional sound recording method, and a three-dimensional sound reproduction method
according to the present invention, for example, install a microphone device between a stage and
a spectator in a theater or the like or If you record 3D sound with 4 channels by installing it in
the center of the grand of the room, etc., it is possible to faithfully reproduce the 3D sound that
the stage side and the audience side face each other or the 360 ° direction of the whole venue.
Yes, it is suitable for live recording etc. Also, if using a multi-track recorder that can record and
play back the recorded media on four channels, adopting four speakers facing each other so as to
cross in the plane direction from the lower side and the upper side Even those who can not go to
live etc. can faithfully feel the realism between the artist and the audience, or, again, temporarily
re-recording the media in a car to four channels Equipped with a multitrack recorder, and two
speakers are provided below the left and right front doors, and another two speakers are
attached to the front windshield of the ceiling corresponding to the center of the front seat If
provided on the rear glass side of the ceiling corresponding to the central part of the rear seat,
the recorded media can be recorded in a multi-track recorder capable of recording and
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reproducing four channels and faithful reproduction of three-dimensional sound such as live
recording is possible. It is possible.
A microphone device for recording three-dimensional sound recording, a three-dimensional
sound recording method, and a three-dimensional sound reproduction method according to the
present invention can enjoy three-dimensional sound by sound image localization excellent in a
hall or the like.
[0018]
Brief description of the drawings
[0019]
Fig. 1 A microphone device for recording three-dimensional sound recording according to the
present invention, a three-dimensional sound recording method, and a conceptual diagram for
explaining a three-dimensional sound reproduction method
[0020]
Explanation of sign
[0021]
1: Stand, MR, ML, MF, MB: Microphone, 1a: board, 1b: post, 1c: lower horizontal ridge, 1d: upper
horizontal ridge, 1e Cross-shaped socket, 1f ... T-shaped socket, A ... Microphone device for threedimensional sound recording, 2, 5 ... Stereo recording and reproducing machine, 3, 4 ... Code, 2a
... Media, 6, 7 ··· cord, SR, SL, SF, SB ··· speaker, 8, 9, 10, 11 ··· cord,
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