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JPH06217400

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DESCRIPTION JPH06217400
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
acoustic apparatus using a sound recording and reproducing system used in the technical field of
audio engineering, for example.
[0002]
2. Description of the Related Art As an acoustic apparatus using a conventional sound field
recording and reproducing method, one having a construction as shown in FIGS. 4 and 5 is
known. Hereinafter, the sound field recording and reproducing method shown in FIG. 4 is
referred to as “conventional method A”, and the sound field recording and reproducing
method shown in FIG. 5 is referred to as “conventional method B”.
[0003]
First, the conventional method A will be described with reference to FIG. In FIG. 4, 1 is a system
for collecting sound, 2 is a sounding body, 3 and 4 are sound collecting means for mainly picking
up direct sound from sounding body 2, and 5 is mainly for picking up reverberation by sound
collecting system 1 Sound collecting means. Further, in FIG. 4, reference numerals 6 and 7
denote prefilter groups, 8 and 9 signal amplification devices, 10 and 11 signal reproduction
means, 12 a reproduction sound listening target person, and 13 a system for reproduction.
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1
[0004]
In this method, the reverberation characteristic of the sound collection system 1 is intended to be
provided by appropriately adding the signal collected at 5 to the signals collected at 3 and 4. In
reproduction, 2ch speakers 10 and 11 or headphones are used as reproduction means.
According to this conventional method A, the listener 12 can enjoy the forward localization by
the natural tone of the sounding body sound image by the speaker reproduction.
[0005]
Next, the conventional method B will be described with reference to FIG. The conventional
method B is a sound field recording and reproducing method having a configuration different
from that of the conventional method A. In FIG. 5, reference numeral 14 denotes a dummy head
made based on the human shape. Reference numerals 15 and 16 denote sound collecting means
disposed at the left and right ears of the dummy head.
[0006]
In this method, in reproduction, there are a method of listening with headphones 17 as shown in
FIG. 5A and a method of using speakers 10 and 11 as shown in FIG. In the case of (i), a signal for
the audio signal emitted from the speakers 10 and 11 to finally remove the component (cross
talk component) which reaches the listener's opposite ear in the ear of the listener 12 It is often
performed to front the processing unit 18.
[0007]
In the conventional method B, acoustic information to be input to the ear is recorded at the
arrangement position of the dummy head 14, and the information is reproduced by the ear of the
listener 12, whereby the arrangement position of the dummy head 14 of the sound collecting
system is The listener 12 is intended to enjoy such a realistic three-dimensional acoustic space
sensation. The above-described conventional sound field sound collecting and reproducing
method has the following problems.
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[0008]
The conventional method A has the following problems. 1. The reverberation sound pickup
means 5 mainly uses a non-directional microphone, and can not record the direction information
of the reverberation of the sound pickup system. 2. Therefore, it is difficult to obtain natural
reverberation even when listening to the reproduced sound.
[0009]
The conventional method B has the following problems. 3. Since it is difficult to match the
shapes of the head and ears of the listener 12 in the recording system and the dummy head 14
in the recording system, the tone tends to be particularly tight during reproduction. The object of
the present invention is to ∼3. It is an object of the present invention to provide an acoustic
device capable of solving all the problems of the above.
[0010]
The problem to be solved is that in the conventional method A it is difficult to obtain a natural
reverberation, and in the conventional method B the timbre tends to be tight. is there.
[0011]
A first means according to the present invention comprises first sound collecting means 3 and 4
for collecting the sound from the sounding body 2 in stereo, and the reverberation of the sound
from the sounding body In the case of reproduction with second sound collection means 20, 21
for collecting the sound by binaural signal, and speakers 10, 11 first matrix processing for
compensating crosstalk of the signal collected by the second sound collection means And an
acoustic device characterized in that it comprises means 29.
[0012]
The second means according to the present invention comprises: first sound collecting means 3
and 4 for collecting the sound from the sounding body 2 in stereo; and second one for collecting
the reverberation of the sound from the sounding body by the binaural signal , And the second
matrix processing means 28 for adding crosstalk of the signal collected by the first sound
collecting means in the case of the headphone 17 reproduction. It is an acoustic device.
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[0013]
A third means according to the present invention is characterized in that the first and second
sound collecting means are provided with sound absorbing means 30, 31 for blocking or
attenuating unnecessary sounds respectively. It is an acoustic apparatus as described.
[0014]
The fourth means according to the present invention determines in advance the reverberation
characteristics of the sound of the assumed sound collecting system, and convolutes the
reverberation characteristics into the sound from the sounding body picked up in monaural
(superimposition processing 38), A sound device according to the first or second means,
characterized in that a signal collected by the second sound collection means is generated.
[0015]
According to this, it is possible to allow the listener to enjoy the reverberation in the sound
pickup system with a three-dimensional spread while the sounding body is localized forward with
a natural tone, and the reverberation by the binaural signal The timbre of the sound can be
lightened.
[0016]
Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a diagram showing the configuration of an embodiment of the present invention.
[0017]
In FIG. 1, numerals 30 and 31 denote sound absorbing means, and the sound absorbing means
30 shuts out sounds from other than the direction of the sounding body 2 so that the sound
collecting means 3 and 4 mainly picks up direct sound from the sounding body 2 Or it is
installed for the purpose of attenuating.
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It is also effective to use a sound collecting means having directivity in the direction of the
sounding body 2 as the sound collecting means 3 and 4 without providing the sound absorbing
means 30.
The sound absorbing means 31 is provided for the purpose of shutting out or attenuating the
direct sound from the sounding body 2 with respect to the sound collecting means 20, 21
disposed at the ear portion of the dummy head 19.
The acoustic signals picked up by the pick-up means 3, 4, 20, 21 are mixed in the mixing stage
with appropriate gains 24, 25, 26, 27 respectively.
At this time, delay elements 22 and 23 may be provided.
[0018]
Further, in the case of assuming a 2-channel speaker as a reproduction system at the time of this
mixing, a matrix processing 29 for the purpose of crosstalk compensation in speaker
reproduction of an acoustic signal recorded by the dummy head 19 is provided.
When headphones are assumed as the reproduction system, matrix processing 28 is provided for
the purpose of adding crosstalk to the signals collected by the sound collection means 3 and 4.
[0019]
FIG. 2 shows an embodiment of each of the matrix processes 28 and 29 in FIG.
[0020]
FIG. 2A shows an example of matrix processing 29 for the purpose of crosstalk compensation in
speaker reproduction in FIG.
S and A in FIG. 2 (A) are the relationship between the speakers 10 and 11 and the listener 12 in
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the reproduction system as shown in FIG. And the acoustic transmission characteristic A from the
speaker to the ear opening located on the opposite side of the speaker. The processes 32 and 33
in FIG. 2A indicate that the FIR process is performed with the filter coefficients calculated as
described therein.
[0021]
FIG. 2 (i) shows an embodiment of the matrix processing 28 for the purpose of adding crosstalk
in FIG. The processes 34 and 35 in FIG. 2 (i) represent the same processes as the processes 32
and 33 in FIG. 2 (a).
[0022]
That is, in this apparatus, in the case of performing reproduction by the 2ch speaker, the sound
by the 2ch stereo microphone which mainly records the direct sound from the sounding body is
reproduced by the 2ch speaker as it is. With regard to the sounding body, it is possible to listen
to the natural timbre as in the conventional system A and the reproduced sound of the forward
localization. In addition, the reverberation sound of the sound collection system recorded by the
binaural signal can reproduce the binaural signal in the ear of the listener of the reproduction
sound by appropriately performing the crosstalk compensation processing by the speaker
reproduction in advance. It is possible to enjoy three-dimensional spatial information of
reverberation in a sound collection system.
[0023]
Therefore, the two-channel speaker reproduction system allows the listener to enjoy the
reverberation in the sound collection system with a three-dimensional spread while the sound
generator is localized forward with a natural tone by appropriately adding these two types of
sounds. be able to. Since the reverberation is lower in level than the direct sound, and the level in
the high region tends to be smaller due to the reflected sound, the tone of the reverberation by
the binaural signal becomes lighter.
[0024]
Thus, according to the above-described apparatus, while the sound producing body is localized
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with a natural tone in the front, the reverberation in the sound collecting system can be enjoyed
to the listener with a three-dimensional spread, and the reverberation by the binaural signal The
timbre of the sound can be lightened.
[0025]
Furthermore, when performing playback with headphones, the audio by the 2ch stereo
microphone mainly recording the direct sound from the sounding body is appropriately
subjected to crosstalk processing in advance, whereby localization such as 2ch speaker
reproduction to the listener is required. You will be able to enjoy the timbre.
The reverberation sound of the sound collection system recorded by the binaural signal can
enjoy three-dimensional spatial information of the reverberation sound if it is reproduced by the
headphone as it is. By appropriately adding these two types of sounds, the headphone
reproduction system allows the listener to enjoy the reverberation in the sound collection system
with a three-dimensional spread while the sound generator is localized forward with a natural
tone. it can.
[0026]
The present invention is not limited to only this embodiment, and various modifications can be
considered, for example, as shown in FIG. In FIG. 3, in the sound collection system 1, sound
impulses are emitted from the positions of assumed sounding bodies, the reverberation
characteristics of the sound collection system are obtained in advance by the dummy head 19,
and the sounding body recorded later in the anechoic chamber 37 or the like. Convolute this
reverberation characteristic to the monaural signal (superimposition processing 38) to artificially
generate reverberation by the binaural signal of the sound collection system 1 as recorded by the
dummy head 19 in the embodiment as shown in FIG. It is a thing. Further, when it is assumed
that the dummy head 19 is disposed away from the sounding body, only the sound impulse
response from an appropriate representative position is obtained without obtaining the sound
impulse response from each of the assumed sounding body positions. May be used as a
representative reverberation characteristic.
[0027]
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As described above, according to the present invention, the direct sound from the sounding body
is recorded on a 2ch stereo microphone, only the reverberation sound in the sound pickup
system is binaurally recorded, and the preprocessing is appropriately performed depending on
the type of reproduction system, The following effects can be obtained by mixing. 1. Compared
to the conventional method A, since the reverberation sound collecting means uses a dummy
head microphone, it is possible to record the direction information of the reverberation of the
sound collecting system. 2. For this reason, as compared with the conventional method A,
natural reverberation can be obtained also when listening to the reproduced sound. 3.
Compared with the conventional method B, the direct sound from the sounding body is picked up
by a general sound collecting means such as the conventional method A, so that the tone of the
dummy head can be felt even in reproduction. You can enjoy the front stereo image without.
[0028]
Also, in the present invention, since the dummy head in the recording system has a low level
compared to the direct sound and is a reflected sound, the level in the high region tends to be
further reduced, and the reverberant sound is mainly recorded. The stereophonic reverberation
can be enjoyed by the listener without making the timbre that is typical for dummy head
recording feel.
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