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JPS58156300

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DESCRIPTION JPS58156300
[0001]
According to the present invention, a sound signal 411a is preferably used, for example, in the
case where a sound signal is picked up as a sound signal or a stereo sound. In general, in the
broad sense that "Pi Nohuru listens with one ear", pinaural sound collection is originally a sound
collection method in which two microphones are separated at a distance 楊 of human's both ears.
The main factor that the human ear refers to the middle distance in the direction of the sound
signal source (hereinafter simply referred to as the sound source) is the sound pressure level
difference between the left and right ears, the time difference (phase 2! And the frequency
characteristics of the sound source. The sound in the direction to the right front can be judged as
the sound in the right front “The sound coming into the right ear is stronger than the sound
coming into the left ear, and it is faster in time than the left ear. Because it will come. As a
concrete example of trying to pick up sound as close as possible to such human hearing ability,
pinaural convergence is considered, and a microphone is attached to a die head or a real human
ear to pick up sound. And if it is reproduced with this collected sound headphone, the direction
and distance of the sound source at the time of sound collection will be reproduced on the 5 K IJ
al, and the sound with movement will be distorted. FIG. 1 shows an example of a conventional
pinaural sound pickup method. First, when recording, as shown in FIG. 1m, the dummy head (left
and right microphones (2) attached to the pinna of ll) The sound signal generated from the sound
@ (4) and (5) is picked up by (3) and recorded by a brass sound device such as a tape recorder
(6). Then, as shown in FIG. 1 BK, the signal played back from the tape recorder (6) is played by a
person III (7) K hung head hoe y (81 with a much more three-dimensional sound when listening
to it by playback) I can hear it. In this case, sound image localization in the left, right, back and
up and down directions is judged by the time difference until the sound generated from the
sound source is evenly distributed to the two left and right ears, the sound pressure level
difference between the left and right, and the frequency characteristic difference. Can be
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increased. But first! In the case of a pinaural sound collection system such as @I, the sound
pressure difference and time difference do not occur with respect to the front position because
the microphone seems to have all the information but the microphone is fixed to the sound input
position. There is a drawback that it is very difficult to localize. In addition, in the case of
reproduction by the headphone, it is considered that the person moves the Kli a little to the left
and right to check the forward sound, and the direction of the sound source is iig. Thus, the
sound image reproduced from the headphone is localized in the head, and there is a drawback
such as not being able to obtain a sense of presence as at a sound collection site and feeling tired.
The present invention has been made in view of such a point, and provides an acoustic signal
transmission device capable of expressing desired sound image localization, in particular,
forward localization in pinaural or out-of-head localization in headphone reproduction. It is
Generally, at the time of reproduction by a headphone, it is considered that a person slightly
changes wax to the left and right to confirm the forward sound as described above, and ii-the
direction of the sound source. Therefore, in order to shift the in-head localization to the out-ofhead localization at the time of headphone reproduction, it is only necessary to artificially add an
operation [1] to move the left and right 41 to determine the sound source direction. The present
invention focuses on this point and mechanically or electrically performs such work #! It is of &
trying to pass through. Hereinafter, the g * 廁 example of the present invention will be described
in detail based on jI 2 to 5. The + SS diagram shows the first embodiment of the present
invention, and in this embodiment, it is intended to mechanically add an operation in which the
head is fixed to the left and right Kall + to determine the sound source direction. That is, a
dummy head memeber (9) is provided in the figure 2 in which a die head (1) is discussed within
a predetermined range as indicated by an arrow and a sound source 霞. K is made to pick up
sound signals from all and α-etc. This makes K suitable for acoustic transducers such as
microphones (2) and +31 K jli attached to the left and right auricles of the dummy head (1)
[sound pressure level difference and time difference to the sound signal from the coming sound
source, a and a3 As it occurs, forward localization will be established. In this case, the microhorns
t21 and 131 and the spaces of the sounds # 1 (1 ·, aυ, α2 substantially constitute a tenth
transmission 1liI, respectively, and the microhorns (2). A signal M (13, Q41) between (3) and the
tape V: 2- / t 61 # constitutes a second transmission point respectively. jI3 shows the second
embodiment of the present invention. In this embodiment, in order to shift the in-head
localization at the time of headphone reproduction to the out-of-head localization, a person
separates 1llli from left to right to determine the sound source direction. It is an attempt to
electrically process by artificially adding work. That is, in FIG. 3, an input terminal to which a
sound signal such as a right signal by pinaural sound pickup or a right signal R1 by a stereo
sound pickup is supplied, a black square is a sound signal such as a left signal Lb by stereophonic
sound fK or a stereo signal It is an input terminal to which the left signal Ls by sound collection is
supplied. And Z are delay circuits using, for example, BBDs or CCDs, which are transferred by the
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clock signals from the clock generators manually transmitted by the clock signals from the clock
generators and delayed with a predetermined time difference at the output side thereof. A
plurality of output signals are to be obtained.
(S1) and α are analog multiplexers arranged at the output 11 of the delay circuit andrespectively, and ▪ are Illllig circuits for generating the left / right time difference control signal
and the sound pressure level difference control signal 【, this control circuit The multiplexer (d)
and the surface are switched by the left and right time difference control signal from (d) and an
output signal having a desired left and right time difference is taken out at the output side
thereof. (支) and 調整 are level adjustment circuits using, for example, a human GC circuit or an
attenuation circuit, and the output from the multiplexer (至) and the surface in response to the
sound pressure level difference control signal from the control circuit (至) It works to give a
sound pressure level difference to the signal. Cυ is an output terminal from which a time
difference, a pinaural right signal to which a sound pressure level difference has been added, or a
stereo right signal Rs ′ is taken out, (d) is a pinaural left signal Lb ′ to which a time difference
and a sound pressure level difference are added It is an output terminal from which the signal Ls'
is taken out. In other words, the thread circuit of the delay circuit (2), the multiplexer (至) and the
level adjustment circuit (2) substantially constitutes one transmission path of the acoustic signal
transmission path, and the delay circuit (2) (5) and the level adjustment II WiA path (1) is
composed of the other transmission tit's of the acoustic signal transmission path. The control of
time, sound pressure level differences by means of meat, control circuits is controlled
correspondingly. Now, the signal supplied from the input terminal (至) and @ is transferred 11th
by the clock signal from the clock generator (2) by the delay circuit Ω and (至), and has a
predetermined time に at its output side It is taken out as a signal. These signals are then
supplied to multiplexers and switched by the left / right time difference control signal from the
111111 circuit. f4 is a signal that is earlier in time than the signal obtained at the output side of
the multiplexer (2) at the output side of the multiplexer (2), when it is desired to take out the
signal corresponding to the state in which the person is right now. In other words, a signal with a
short delay time is output. And in this case, since the level of the right ear Kl1 should be greater
than the sound pressure level reaching the left side, in the level adjustment circuits (2) and (d),
control-wl! The sound pressure level difference control signal from (2) is taken out so that the
level of the output of the level adjustment mWj & 1llI @ is larger than the output of the level
1141 circuit.
Therefore, at the output terminal C3υ and the mouth, the signals added with the time difference
and the sound pressure level difference, ie, the pinaural signals b 'and Lkt' or the stereo signals
Rs and Lm which are obtained in front localization are deposited. FIG. 4 shows another example
for giving a time difference to input signals. That is, in the fourth, a voltage control oscillator-and
a control-# &-which supplies a time lid control signal as a voltage control signal to the voltage
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control oscillator @ are provided, and the control signal from the control circuit ) Control the
lingling wave frequency of), and it is supplied to WIl (weekly) by the force of the threatening
vibrator (seventh), in this case, the stereo left signal L $ will be pervaded, The signal L1 + Δt
having the output 11Kj1 駕 jt is ordered K in order. FIG. 1115 shows another example for
providing time difference and sound pressure level に to the input signal. That is, in FIG. 5,
weighting with a plurality of, for example, resistors arranged at each output end of the eigeniiI
junction is a time difference control signal for providing a circuit and switching control of the
multiplexer (2). Control circuit to generate According to such a configuration, for example, when
a signal of pinaural right signal is supplied to the delay circuit Ω, this signal is sequentially
transferred by the clock signal from the clock generator and is deposited at the output 11 with a
predetermined time difference. , This extracted signal is further weighted gii * 所 定
predetermined sound pressure level! ! kt-is added to [sup. Then, this multiplex is switched by the
time difference control signal from the control circuit 11, so that a pinaural right signal added
with a desired time difference and sound pressure level difference is taken out at the output side.
It is to be noted that the weight of the resistor (KP) is set so that the circuit (d) has a short delay
time and the level difference becomes large. As described above, according to the present
invention, in the acoustic signal transmission 11 comprising at least two transmission paths, the
transmission function of the acoustic signal transmitted to at least the ilm transmission path of
the acoustic signal transmission paths, for example, the time difference or Since at least 41 of the
sound pressure level differences (intensity) are made different by 5 K in a time cycle, desired
sound image localization, in particular, forward localization can be reliably localized.
Alternatively, the kernel stems to ensure localization outside the head at the time of headphone
reproduction of the audio signal. In each of the above-described embodiments, at least l @ of the
number of transmission ras such as the sound pressure level difference and the time difference
of the sound signals may be varied in a time cycle.
[0002]
Brief description of the drawings
[0003]
Figure jl1 is a block diagram showing an example of the conventional pinaural sound pickup
method, 纂 2 is a block diagram showing an embodiment of the present invention, and Figure 3
is a block diagram showing another embodiment of the present invention, Figure 篇 4 And 總 5li)
is a block diagram showing another example of the main part of FIG.
fil is a du 2-head, t 2 +, + 31 is a microphone, (6) is a tape recorder, (9) is a rotating device, (11,
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Qυ 劃 side is a sound source, α 3. Q 尋 is a signal line, O1 (ロ) is a delay circuit, k is a clock
generator, (至), @ is an analog multiplexer, (至) is 111 JIK1 circuit, ((), C30 is a level-wart circuit.
(瀞
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