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JPH06303693

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Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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DESCRIPTION JPH06303693
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
microphone apparatus suitable for use in a recording and reproducing system capable of
reproducing the states of a plurality of sound sources more faithfully as real sound images.
[0002]
2. Description of the Related Art Heretofore, various recording methods and reproduction
methods have been proposed and tried as to how to faithfully reproduce (reproduce) sounds
such as sounds and sounds having spatial spread as real sound images. . In particular, in stereo
televisions and the like, there is a demand for more faithful reproduction of sound as well as
stereoscopic reproduction of the image. For example, in the "intense stereo method", which is a
general sound collection and reproduction method, sound is collected using a large number of
microphones as sound collection means, and the level difference is made to a predetermined
plurality of channels, for example, N channels. Information such as time difference is added and
distributed for recording, and at the time of reproduction, a sound image is generated by N
speakers arranged at a predetermined position. In addition, a binaural sound pickup
reproduction method and a one-point sound pickup reproduction method are also known.
[0003]
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By the way, since all of the conventional sound collecting and reproducing methods represented
by the above-described examples reproduce a virtual sound image, they still achieve the original
purpose of generating a real sound image. Can not do it. As a result, there is still a problem
caused by the virtual sound image, for example, the reproduction position of the sound is limited,
the image of the sound is not formed when the position shifts, and the real feeling is not obtained
when approaching the position of the virtual sound image.
[0004]
Generally speaking, the generation of a real-sound image needs to consider not only sound
collection or reproduction but, of course, the overall conditions from the sound collection process
to the reproduction process. For that purpose, it is necessary to consider the method of recording
the sound collection, the editing method, and the like. In addition, in the conventional sound
collection and reproduction method, there is a drawback that the listening point for reproducing
the sound image effectively is limited within a limited area. In the conventional sound collection
system, in order to multiplex and record these pieces of information on the audio signal channel
simultaneously, it is inconvenient because it requires an independent multiplexer. In addition, it
is difficult to supply accurate information because the collection point and the multiplexing
device are separated.
[0005]
The present invention has been made in view of the above-described circumstances, and can
reproduce a sound image as a real sound image, reproduce a more realistic sound field in which
the position of the sound source on the screen matches the position of the reproduced sound
image. It is an object of the present invention to provide a microphone device which is easy to
handle means, easy to accurately give information on the sound collection point itself, and does
not require connection between the sound collection means at the sound collection point and the
multiplexer. .
[0006]
SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the microphone
device of the present invention detects a sound from a sound source and outputs it as an audio
signal, and a sound detection means and a proximity to the sound detection means. And the
position detection means for outputting the position information of the sound detection means
and the position of the sound source, or any one of the position information.
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Preferably, the microphone device outputs the position information independently of an audio
signal output from the sound detection means. In addition, preferably, the microphone device
multiplexes the position information on the voice signal and outputs it. Preferably, in the
microphone device, the position detection means is a gyroscope incorporated in the sound
detection means.
[0007]
In the present invention, a sound detection means for detecting a sound from a sound source and
outputting it as an audio signal, and an arrangement position of the sound detection means and a
sound source position provided in proximity to the sound detection means The position of the
sound source and the position of the sound detection means are multiplexed and recorded
together with the voice signal by the microphone device incorporating the position detection
means for outputting one of the position information. Since the audio signal and its positional
relationship are recorded, it is possible to reproduce the sound image as a real sound image, and
it is possible to reproduce a more realistic sound field in which the position of the sound source
on the screen matches the position of the reproduced sound image. . Further, since the sound
detection means and the position detection means are integrated, handling is easy, information
on the sound collection point itself can be accurately given, and connection is not necessary. In
the above microphone device, when the position information detected by the position detecting
means is outputted independently of the audio signal outputted by the sound detecting means,
the signal processing in the editing operation and the reproduction operation performed as the
post-processing becomes easy. Further, in the microphone device, when the position information
is multiplexed into an audio signal and output, it is easy to handle, it is easy to accurately give
information on the sound collection point itself, and connection is not necessary. Furthermore,
the position detection means may be a jeroscope incorporated in the sound detection means.
[0008]
Next, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a block diagram of a sound collection system (system or apparatus) to which a
microphone device according to a first embodiment of the present invention is applied. The
sound collection device shown in FIG. 1 will be described in relation to a specific example, for
example, when performing live collection of a performance at a concert venue. Generally
speaking, sound processing includes, for example, the performance sound of a concert, the
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position and size of a sound source to be collected and reproduced such as engine sound in a car
stadium, the position of a sound collection microphone, and the sensitivity characteristics. How
can a real-sound image be generated by taking as a whole a series of related items such as sound
collection conditions such as directivity, editing methods and their device conditions,
reproduction methods, performance of devices used for sound processing, etc. From the point of
view of, the conditions in each process will be determined again. This sound collection device
collects sounds from the plurality of sound sources so as to be able to reproduce a real sound
image, in consideration of recording and reproduction.
[0009]
In FIG. 1, in the concert hall, as a sound source to be collected, in addition to a plurality of
musical instruments such as the piano 1 and the violin 2, a sound from the audience of the
concert hall 3 exists. The sound collection device shown in FIG. 1 has a plurality of microphone
devices, and in this example, the first microphone device 11 for detecting the sound from the
piano 1 and the second for detecting the sound from the violin 2 The microphone device 12 has
an N-th microphone device 13 for detecting the sound from the hall 3.
[0010]
In addition, the first microphone device 11 has a first microphone 11a, a first position detection
device 21 for providing information indicating the position thereof, and a multiplexer 31, and the
second microphone device 12 is a second microphone device. It has a microphone 12a, a second
position detector 22 providing information indicative of its position, and a multiplexer 32.
Furthermore, the third microphone device 13 has an Nth microphone 13a, an Nth position
detection device 23 for providing information indicating its position, and a multiplexer 33.
Further, the sound collection device has a sound collection signal storage and reproduction
device 40.
[0011]
The first microphone device 11 is disposed in the vicinity of the piano 1, detects a sound image
mainly using the piano 1 as a sound source, and outputs it to the first multiplexer 31 as a sound
signal S1. Similarly, the second microphone device 12 is disposed in the vicinity of the violin 2,
detects a sound mainly with the violin 2 as a sound source, and outputs it as a sound signal S2 to
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the second multiplexer 32. The microphone device 13 detects the sound image of the concert
hall 3 and outputs it to the Nth multiplexer 33 as a sound signal SN.
[0012]
In addition, the first position detection device 21 built in the first microphone device 11 outputs
the position of the piano 1 (or the arrangement position of the microphone 11 a), and the second
microphone device 12 incorporates the second position detection device. The position detection
device 22 outputs the position of the violin 3 (or the arrangement position of the microphone
12a). Furthermore, the Nth position detection device 23 built in the Nth microphone device 13
detects the position of the concert hall 3 (or the arrangement position of the microphone 13a).
[0013]
For detection (calculation) of the position, for example, a method using gyroscope (x, y, z:
multiplexed signals are also acceptable) output calibrated at the reference position, a method
using satellite radio waves such as satellite (GPS), Alternatively, there is a method of measuring
the distance (time) from a plurality of ultrasonic sound sources. The position information
supplied from the first position detecting device 21 to the N-th position detecting device 23 is a
predetermined reference position P (X0, Y0, Z0) of the concert hall 3, for example, the position of
the conductor Is indicated as a relative position or an absolute position P (xi, yi, zi) in the
rectangular coordinate system, with. Further, the position information is not limited to
orthogonal coordinates, and may be, for example, a polar coordinate system P (ri, φi, θi).
[0014]
Musical instruments such as the piano 1 and the violin 2 in the concert hall are usually disposed
at fixed positions in the concert hall 3. Therefore, in this example, the first position detecting
device 21 and the second position detecting device 22 supply the position information detection
signals MP1 and MP2 of the fixed piano 1 and the violin 3 to the multiplexers 31 and 32,
respectively. . Further, the positional information of sound from the audience at the concert hall
5 is supplied to the multiplexer 33 as a positional information detection signal MPN of the whole
hall.
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[0015]
The first multiplexer 31 multiplexes (multiplexes) the microphone detection sound signal S1
detected by the first microphone 11a and the microphone position information detection signal
MP1 from the first position detection device 21. Similarly, the second multiplexer 32 multiplexes
the microphone detection sound signal S2 from the second microphone 12a and the microphone
position information detection signal MP2 from the second position detection device 22. Further,
the N-th multiplexer 33 multiplexes the microphone detection sound signal SN from the N-th
microphone 13a and the microphone position information detection signal MPN from the N-th
position detection device 23.
[0016]
These multiplexed signals are input to the collected sound signal storage and reproduction
apparatus 40 as input multiplexed signals IM1 to IMN, respectively, and are recorded at
positions corresponding to the respective audio channels. Thus, the microphone detection sound
signal S and the corresponding microphone position information detection signal MP are
recorded in the same audio channel in a multiplexed state.
[0017]
As a method of multiplexing sound signals and position signals in the first multiplexer 31 and the
second multiplexer 32, for example, a frequency multiplexing method suitable for analog signal
processing or a time multiplexing method suitable for digital signal processing is used. . The
frequency multiplexing method will be described with reference to FIG. As is well known, the
frequency band of audible sound is about 16 Hz (or about 20 Hz) to about 2000 Hz. A frequency
band is used for multiplexing the microphone detection sound signal S, and a frequency band
outside this frequency band is used for multiplexing the microphone position information
detection signal MP. As the frequency band of the microphone position information detection
signal P, as indicated by the broken line, a frequency band lower than the frequency 16 Hz or as
indicated by the solid line, a frequency band of 2000 Hz or more is used.
[0018]
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Next, time multiplexing will be described with reference to FIG. The microphone detection sound
signal S and the microphone position information detection signal P are divided in time series
and multiplexed for each of a plurality of audio channels. As multiplexing in the first multiplexer
31 to the N-th multiplexer 33, time multiplexing that performs digital processing is easy, but
frequency multiplexing is somewhat difficult to perform individually in consideration of price
factors. Therefore, when frequency multiplexing is performed, even if the microphone detection
sound signal S and the microphone position information detection signal MP are once input to
the collected sound signal storage and reproduction device 40, frequency multiplexing is
performed in the collected sound signal storage and reproduction device 40. Good. Further, time
multiplexing processing may be performed in the sound pickup signal storage and reproduction
device 40.
[0019]
In any case, the sound signal and the corresponding position signal are separated for each audio
channel from the sound collection signal storage and reproduction device 40, and the output
signals OS1, OM1, OS2, OM2,. , OMN pairs are output.
[0020]
Recording on the N-channel audio channel in the sound collection signal storage / reproduction
device 40 is, for example, recording on a magnetic tape, recording on an optical disk, recording
on a semiconductor memory, etc. Ru.
[0021]
A stored signal for each audio channel stored in the storage medium by the sound collection
signal storage and reproduction device 40 is edited as necessary, and is output as an audio signal
and a corresponding position signal for each channel at the time of reproduction.
In the editing process, since the sound signal and the position signal are multiplexed and stored
for each audio channel, it is possible to perform an audio editing operation to which spatial signal
processing is added.
In addition, without passing through this editing operation, sound information including position
information stored in the above-described sound collecting device can be directly reproduced.
Alternatively, in the sound collection signal storage and reproduction device 40, directly output a
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signal in which sound information and position information are multiplexed and a signal not to
be multiplexed are directly reproduced for each audio channel without storing in the storage
medium. You can also. The reproduction process will be described later.
[0022]
As described above, in the above-described embodiment, the dimensions (sizes) of the sound
sources of the piano 1, the violin 2, the concert hall 3 and the like are added to the microphone
detection sound signal S and the microphone position information detection signal MP and
multiplexed. The information is richer, and it is suitable for information editing processing and
reproduction to form a real sound image. Furthermore, the directivity of the piano 1, the violin 3
or the like, or the directivity of the first microphone 11 and the M-th microphone 12, etc. is also
added to the microphone detection signal S, the microphone position information detection
signal MP, and the size of the sound source. Multiplexing is preferred in editing and playback as
well as adding source dimensions.
[0023]
As provision of position information in the first position detection device 21 to the N-th position
detection device 23, in addition to providing the sound source position as position information,
the arrangement positions of the first microphone 11a to the N-th microphone 13a Also provide.
Alternatively, as the position information, the arrangement positions of the first position
detection device 21 to the N-th position detection device 23 are provided as position information.
As described above, by storing accurate position information together with sound information, it
becomes possible to form a more accurate real sound image through editing processing and
reproduction processing.
[0024]
In this embodiment, the sound is collected at the concert hall 3, and the piano 1, the violin 2 and
the like are at fixed positions, and the arrangement positions of the first microphone 11a to the
N-th microphone 13a are also fixed. Therefore, in this embodiment, the position information
indicating the above-mentioned arrangement relationship is set in advance in the collected signal
storage and reproduction device 40 without using the first position detection device 21 to the Nth position detection device 23. The first position detection device 21 to the Nth position
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detection device 23 may not be provided. However, in the sound collection signal storage and
reproduction apparatus 40, the set position information is superimposed on the microphone
detection sound signal S from the first microphone 11a to the Nth microphone 13a. Since the
position information is fixed, the method of superposing the position information may be stored
in each audio channel in the head portion or the like without being always multiplexed.
[0025]
Next, a method of reproducing an audio signal reproduced from the sound pickup signal storage
and reproduction device 40 and a position signal corresponding to the sound signal will be
described. The arrangement of the speakers of the speaker system 140 is shown in FIG. FIG. 6A
shows a front view of the speaker system 140, and FIG. 6B shows a cross-sectional view thereof.
In this example, M speakers SP are arranged in a concave shape.
[0026]
This speaker arrangement itself is the one proposed by Olson (e.g., by Olson, translated by
Nishimaki, in "Sound Engineering", 1959). In this speaker system, when a large number of
speakers SP are arranged in an array and the amount of delay of the applied signal is adjusted to
create the focal point F of the sound wave at one point in space, the sound pressure is extremely
high at one point in the vicinity of the listener On the basis that points are synthesized, a
situation occurs as if there is an actual sound source at this point, and the sound image is
perceived at that position as a psychoacoustically (for example, Komiyama et al., “For 3D TV
"Development of sound image perspective control technology", NHK Giken R & D, February 1991,
No. 2, pages 10-14). Generally speaking, M speakers SP are disposed as shown in FIG.
[0027]
FIG. 5 shows a perspective view of an apparatus 100B for performing first video and sound
reproduction. In FIG. 5, the TV monitor device 170 has a TV monitor display unit 17. The video
captured by the first imaging device 61 or the second imaging device 62 is displayed on the TV
monitor display section 171. The sound source image in this display screen, for example, the real
sound image at the position of the piano 1 The sound sources such that the speakers 181 to 183
having directivity in a plurality of arbitrary directions are displayed on the TV monitor display
unit 171 such that there is a position of the first imaging device 61 in the TV monitor display
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unit 171 of the piano 1, for example. It is specified in relation to the position and the position of
the piano. The directivity of the beam 191 is controlled by the sound source position information,
and the speakers 181 to 183 are controlled so that the corresponding sound points to the sound
source as the reproduced image on the display surface of the TV monitor display unit 171. As a
result, a real sound image position 172 is defined at a position directed by the beam 191 at a
position corresponding to the sound source position on the surface of the TV monitor display
171, and from the image position of the sound source displayed on the TV monitor display 171
The viewer feels like the sound is coming out. That is, a real sound image is formed on the TV
monitor display unit 171.
[0028]
FIG. 6A is a perspective view of an apparatus 100C for reproducing a second image and sound,
and FIG. 6B is a plan view of a transparent electrode plate 200. The TV monitor 170 shown in
FIG. 6A is similar to the TV monitor 170 shown in FIG. The transparent electrode plate 200 is
disposed on the front surface of the TV monitor display unit 171. This transparent electrode
plate 200 is a substantially transparent sheet member which is vibrated by an electrical voice
signal as disclosed in the utility model registration application "Speaker device" filed by the
present applicant on December 17, 1984. Is formed and emits sound from the front position on
the front. The transparent electrode plate 200 is divided into a plurality of sections 201 to 209,
and predetermined ones of these sections are selectively driven. Selection of the sections 201 to
209 is performed in the same manner as described with reference to FIG. 5 corresponding to the
sound source displayed on the TV monitor display section 171. As a result, the sound is emitted
from the portion where the sound source of the TV monitor display section 171 is displayed, and
a real sound image is present at the corresponding position on the display screen of the TV
monitor display section 171.
[0029]
FIG. 7A is a perspective view of an apparatus 100D for reproducing a third image and sound, and
FIG. 7B is a cross-sectional view of the apparatus 100D. The sound and video reproducing
apparatus 100D uses a color liquid crystal display 210 as a display device. Each of the pixels 221
to 224 of the color liquid crystal display 210 includes R, G, and G, and sound output holes 211,
212, and 213 are formed in the periphery of these pixels. The sound output from the small
speaker 231 is output from the sound output hole 213. The selection of the small speaker 231 is
performed corresponding to the image position of the sound source displayed on the color liquid
crystal display 210, as described with reference to FIG. Also in this embodiment, a corresponding
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sound is output from the sound source displayed on the screen of the color liquid crystal display
210, and a real sound image is present there.
[0030]
FIG. 8 shows a cross-sectional view of an apparatus 100E for performing fourth video and sound
reproduction. The sound and video reproduction apparatus 100E is a display apparatus of a
projection display system, and an image is projected from the projector 250 onto the screen 260.
A large number of sound output holes 261 to 269 are bored in the screen 260, and speakers 271
to 279 are disposed on the back side of these holes. A speaker corresponding to the sound
source displayed on the screen 260 is driven, and a corresponding sound is output from the
image position displayed on the screen 260.
[0031]
FIG. 9 shows a cross-sectional view of a fifth video and sound reproducing apparatus 100F.
Similar to the display device shown in FIG. 8, this embodiment is also a display device of a
projection display method in which an image is projected from the projector 300 onto the screen
311, but vibration is caused by vibration members 321 to 326 arranged on the back surface of
the screen 311. The plate 313 is vibrated, the position corresponding to the sound source
displayed on the screen 311 is vibrated, and the sound is output therefrom. Therefore, also in
this example, the actual sound is emitted from the sound source displayed on the screen 311.
[0032]
Thus, according to the first embodiment, at the time of sound collection, the sound collection
position, relative sound collection sound source (for any M (N.gtoreq.M) of the N independent
sound signal channels The information collecting apparatus (microphone, position detection
apparatus) in the microphone apparatus using a sound collection recording method in which
information on the position of reproduced sound and the size of the sound source (reproduced
sound image) are simultaneously multiplexed on each audio signal channel. And a multiplexing
device (multiplexer), and by controlling each input of a large number of loudspeakers arranged,
for example, in an array (matrix) as a playback device, it becomes possible to reproduce a sound
image as a real sound image, A more realistic sound field can be reproduced where the position
of the sound source above matches the position of the reproduced sound image, and since the
microphone output and sound source information multiplexing device are integrated, handling is
simplified. In easily accurately provide information sound collection point itself, and has the
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advantage that connection is not required.
[0033]
Next, a second embodiment of the present invention will be described with reference to FIG.
The same parts as those in the first embodiment described above are designated by the same
reference numerals, and the description thereof will be omitted. In FIG. 10, the microphone
devices 14, 15, 16 of the second embodiment incorporate the information collecting device
(position detecting device) together with the microphones 14a, 15a, 16a, but without using a
multiplexer, the positional information of the microphones Is recorded on a channel independent
of the channel of the audio signal. The method of reproducing the audio signal and the position
signal corresponding thereto is the same as that in the first embodiment using the abovedescribed speaker system.
[0034]
In the second embodiment, at the time of sound collection, information on the sound collection
position of the collected sound, the relative sound collection sound source (reproduction sound
image) position, and the size of the sound source (reproduction sound image) is a channel
independent of the sound signal. The above-mentioned information collecting apparatus is built
in the microphone by using the sound recording method recorded simultaneously on the other
hand, while controlling each input of a large number of speaker groups arranged in the abovementioned array (matrix) as a playback apparatus. By doing this, it is possible to reproduce the
sound image as a real sound image, and it is possible to reproduce a more realistic sound field in
which the position of the sound source on the screen matches the position of the reproduction
sound.
[0035]
Therefore, according to the second embodiment, since the information collecting device is built in
and integrated in the microphone device, it is easy to handle, and accurate information on the
sound collecting point itself can be easily obtained. Since position information is independent,
there is an advantage that editing can be easily performed by using only voice information alone
or changing only position information.
[0036]
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The embodiment of the present invention is not limited to the above-described embodiment, and
various modifications can be made.
Further, the embodiments described above can be combined as appropriate when implementing
the present invention.
[0037]
As described above, according to the microphone device of the present invention, a sound image
can be reproduced as a real sound image, and a more realistic sound field in which the position
of the sound source on the screen matches the position of the reproduced sound image is
obtained. The advantage is that the sound collecting means can be reproduced easily, the
information of the sound collecting point itself can be accurately given, and the connection
between the sound collecting means of the sound collecting point and the multiplexing device is
unnecessary. can get.
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