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JPS502081

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DESCRIPTION JPS502081
? Pseudo 4 channel 3D sound reproduction signal generation device ? Japanese Patent
Application No. 46-4548 [phase] Application No. 46 (1971) February 5 published No. 47-18302
@ Akira 47 (1972) September 13 0 inventor Suda Nobuaki 12 Nippon Victor Co., Ltd. in Moriyacho, Jina-ku, Yokohama City, Japan, Inc., Masanobu Doshinozaki Co., Ltd. ? Applicant Japan
Victor Co., Ltd. 120 representative attorneys of Moriya-cho, Kanagawa-ku, Yokohama-ku 3 The
listener can be given a three-dimensional sound by recording or transmitting information signals
obtained from a large number of sound sources distributed in a plurality of channels as signals of
a plurality of channels and reproducing the signals of the plurality of channels with a plurality of
reproduction sources on the reproduction side. As a stereophonic sound reproduction system,
the number of channels of the signal in the form of the signal to be recorded or transmitted, or
the arrangement of the reproduction sound source is implemented or attempted. . The
stereophonic sound reproduction system, which has been most commonly implemented in the
past, radiates left and right acoustic signals from the two reproduced sound sources placed in
front of the listener into space to form a three-dimensional sound field in space A so-called 45-45
single-groove disc record (hereinafter referred to as ?the 45-45 system?), which adopts such a
signal form as to obtain compatibility with a monaural sound reproducing apparatus as its
program source. A broadcast radio wave according to a carrier suppression AM и -FM threedimensional sound broadcasting system or the like is simply used as a record), and at present
there is a remarkable one of its widespread use. By the way, in the three-dimensional sound
reproduction system, it is known that, by generally diversifying sound sources, a threedimensional reproduction sound field having a better sense of reality can be obtained, which is
several years ago in the applicant company's company It is also clarified from the experimental
results of various three-dimensional sound reproduction methods which are further performed.
That is, in a multiple stereophonic sound reproduction system in which reproduction sound
sources are diversified, a front four-channel stereophonic sound reproduction system (sometimes
called a 4-? system in some cases) in which four reproduction sound sources are arranged only
on the front of the listener Two front channels in the front and two rear channels in the rear with
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two channels of playback sound source arranged on the front of the listener and the latter
(sometimes called "2-2 system"), three [111 111 on the front of the listener [EndPage: 1 channel
of playback sound source and one channel of playback sound source behind the listener] Front 3
channels 1 channel rear sound reproduction system (sometimes referred to as 3-1 system) And
other so-called four-channel stereophonic sound reproduction methods such as the sense of
presence and the clearness of the localization of the sound source are currently put to practical
use. It has been confirmed that the system is significantly superior to the widely spread already
mentioned front two-channel stereophonic sound reproduction system (sometimes referred to by
the abbreviation 2-0 system), and the company of the present applicant There is also the
emergence of a disk record for 4-channel stereophonic sound signal reproduction that has been
researched and developed, and as a standard system to replace the current 2-? system in the
near future.
It is expected that the 4-channel stereophonic sound reproduction system will be widely put to
practical use. The improvement of the sense of realism and the improvement of the sense of
expansion of the sound field by the diversification of the reproduction sound source described
above can also be obtained to some extent by the pseudo-multiple three-dimensional sound
reproduction method. We have researched and developed a system for generating a pseudo fourchannel stereophonic sound reproduction signal from a 2-0 program source, thereby obtaining a
pseudo four-channel stereophonic reproduction sound field, and have achieved results. In the
above-mentioned proposed system, the difference signal between the left and right channel
signals in the 2-? system stereophonic sound reproduction signal is an indirect sound
component in which the direct sound component in the program source is eliminated The
difference between the left and right channel signals is also four channels, focusing on the fact
that it is composed of reflected sound, reverberation of a hole, and delayed reverberation
artificially added at the time of mixing operation during recording. The sound of indirect sound
component is emitted from the rear reproduction sound source by supplying to the rear
reproduction sound source in the stereo sound reproduction system, and the pseudo 4-channel
stereo sound is generated using the program source for the stereo sound reproduction of the 2? method. It is intended to obtain a playback sound field. However, in the pseudo 4 channel
stereophonic sound reproduction sound field obtained as described above, there are places
lacking in realism because low frequency components are missing in the indirect sound
components reproduced from the rear reproduction sound source. 4) In addition, indirect sound
lumpy scattered impressions, ? 11), f-m L, q to PJ-Mj?l-breath code 1 ? 1-4-11-1------ It was
found that it gave a sense of pleasure, a sense of harmony, or a sense of psychological instability.
That is, the reflected sound and reverberation that reach the listener's ear in an actual
performance venue etc. contain the sound of the frequency component of the low frequency
band with a large energy and are present to the listener The indirect sound components in the
left and right channel signals of the 2-? system intended to give a feeling also include a large
number of low frequency components. However, in general, the frequency components of the
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bass region have the same phase and the same level in the left and right nona channel signals. In
the case where the difference signal between the left and right channel signals of the 2-0 system
is used as the indirect sound component as described above, the difference signal contains the
frequency component of the bass region. As described above, the indirect sound component to be
obtained contains almost no frequency component in the low frequency range, or a relatively
large amount of noise component is mixed. Even if the indirect sound component signal thus
obtained is given to the reproduction source on the rear side to radiate the sound, only a pseudo
4 channel stereophonic sound reproduction sound field with unsatisfactory presence can be
obtained.
Further, when the indirect sound component signal is obtained by the difference signal between
the left and right channel signals of the 2-O system as described above, the obtained indirect
sound component signal is uncomfortable or discordant to the difference signal listener. Give a
sense of psychological instability. Furthermore, even if the means for forming the indirect sound
component signal by the difference signal method as described above is applied to the case
where the original signal is a monaural signal ((L О B) signal), in that case the difference from
the principle Since the signal is 0, it is not possible to obtain an indirect sound component signal
by the difference signal. Therefore, such a difference signal system as described above gives an
effective presence to the reproduced sound field by the monaural signal. It is impossible to
manipulate and the method also has the disadvantage that it is not possible to effectively use a
four channel stereophonic sound reproduction device for monophonic program sources. 9 The
present invention overcomes the drawbacks of the above-mentioned known difference signal
system, has a rich sense of realism, and allows listeners to listen to J-ray 'l-ha-qX' ' C / C 1411
channel 3D sound reproduction signal field capable of forming a 3D sound reproduction signal
field W + aaaaa 1EndPage: 2 is provided, which will be described hereinafter with reference to
the attached drawings The contents are explained concretely. FIG. 1 of the attached drawings is a
block diagram of a pseudo four-channel stereophonic sound reproduction signal generating
apparatus according to the present invention, wherein F is a front signal (front ░ channel signal)
supplied to a reproduction sound source arranged in front of a listener. B is a generation circuit
of the rear signal (rear channel signal or reverberation delay component signal) to be supplied to
the reproduction sound source disposed behind the listener, and FIG. 2 is a pseudo 4-channel
solid of the present invention. It is a circuit diagram of one Example of a sound reproduction
signal generation apparatus. In the figure, 1 and 2 are terminals of an input signal to which two
signals having acoustic information content portions related to each other are individually
applied as input signals of the respective channels, and the signal of the original program source
is For example, in the case of a 2-0 system signal, a left channel signal (hereinafter also referred
to as L signal) may be applied to terminal 1 and a right channel signal (hereinafter referred to as
R signal) may be applied to terminal 2. A right channel signal may be applied to terminal 1 and a
left channel signal may be applied to terminal 2 (of course, terminal 1 may also be described).
Furthermore, when the original program source signal is, for example, a monaural signal ((L-to-R)
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signal), the same monaural signal is applied to both terminals 1 and 2.
In the description of the embodiment of the present invention in the following specification, it is
assumed that the left channel signal (L signal) is applied to terminal 1 and the right channel
signal CR signal is applied to terminal 2 respectively. It is explained. The input signal of the
instrumental channel individually applied to the terminal 1.2 is the line 11. It is supplied to the
rear signal generation circuit B through t2 and to the front signal generation circuit F through
lines t3 and A4. First, the line t3. The input signal of the instrumental channel applied to the
front surface signal generation circuit F via t4 is adjusted in the crosstalk amount between both
channel signals in the crosstalk amount variable adjustment circuit C in the front surface signal
generation circuit F. After that, a front signal amplification circuit At provided for each channel.
The signal level is amplified to the required signal level by A2, and then applied from the front
signal output terminals 3 and 4 to the reproduction sound source disposed on the front of the
listener through the power amplifier (not shown). In FIG. 2, the variable resistor VRI in the
Slostalk amount variable adjustment circuit C in the front surface signal generation circuit F is
connected to the point Y and two points in the figure via the lines t3 and A4. This is for variably
adjusting the amount of crosstalk between input signals. By adjusting the variable resistor VR, 1
to make the separation between both channels in the front signal variable, for example, over a
range of about 8 db to about 20 db, It is possible to realize an effect of moving the localization of
the reproduction sound in the front and back direction of the reproduction sound field. The
variable resistors VR 2 and VR 3 in the crosstalk amount variable adjusting circuit C are for
adjusting the level of the front signal. In the illustrated example, the signal applied to the
crosstalk amount variable adjustment circuit C via the terminal 1 ? line t3-Y is a + L-fold signal,
and the crosstalk amount is variable via the terminal 2 ? line t4 ? Z. The signal applied to the
adjustment circuit C is a 10R signal, and the + L-fold signal and the R signal are changed in level
and information content from the original L signal and R signal respectively by the adjustment of
the variable resistors VR and l. The signals + Li and + Ri are used. In the illustrated example,
these signals + Li and 10Ri apply the -Li signal and the -44i signal to the output terminals 3 and
4 through the front signal amplification circuit AI including the transistor amplifier of the emitter
grounded type and A2, respectively. In the above description and the following description,
although the positive and negative signs attached to the signals indicate the polarity of the
signals, it should be noted that the positive and negative signs in each of the signals cited and
described in the present specification. The reference numerals correspond to the case where the
pseudo four channel stereophonic sound reproduction signal generating device of the present
invention is implemented as that of the circuit arrangement of the configuration as shown in FIG.
2, and the present invention is implemented by the circuit arrangement of another configuration.
When implemented, the polarity of the signal at each part may be different from that described
herein.
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Incidentally, a line t3. For supplying an input signal to the front surface signal generation circuit
F. Although t4 is connected to the terminals 1 and 2 in the example shown in FIG. 2, instead of
connecting the lines t3 and A4 to the terminals 1 and 2, the W point and the X point in FIG. It
may be connected to Next, the rear signal generation circuit B will be described. First, the input
signal (original signal), the signal R of the instrument channel supplied via the terminals 1 and 2
through the lines tl and 12, and the signal R are In the state where only the phase of the bass
frequency portion is inverted (changed) with respect to the phase of the portion corresponding to
the original signal plus signal and the + R-fold signal by the phase shift circuits 81 and 82
provided for each channel. The change signal (which is used as indicated by + LZ? and + RL?),
ie, ? ?, + RL?, the original signal, and the signal l ?? Signal No. 4 and No. 4 are respectively
phase-inverted and signal No. -mg. An example of the configuration of the phase shift circuits S1
and 82 described above is shown in the circuit arrangement in block 81.82 in FIG. In the phase
shift circuit 81.82 shown in FIG. 2, signal R and R signals are obtained at both ends of the
collector resistances R1 and R3 of the transistors Q1 and Q2, respectively, and at both ends of
the emitter resistances R2 and R4. Are respectively obtained by + L times signal and 10 R signals.
The -L signal and -R signal are applied to the matrix circuit M via coupling capacitors CI and C2
connected to the collectors of the transistors Q1 and Q2, and + L obtained at the emitters of the
transistors Q1 and Q2 The frequency part of the bass region is multiplied by the phase shift
network composed of the resistor R5 and the capacitor C3 connected between the collector and
the emitter of the transistor Q1 and Q2, and the resistor R6 and the capacitor C4, respectively.
Only the phase of L is sent to the matrix circuit M after being made to be a modified signal of 10
LZ? and 10 RZ? that are inverted with respect to the phases of the original signal and the 10R
signal. In the phase shift circuit shown in the above configuration example, the resistance value
and the capacitance value of the resistor R5 and the capacitor C3 (and the resistor R6 and the
capacitor C4) are appropriately selected to obtain the required bass range of the signal. It is
possible to obtain a modified signal in which the phase is inverted in the frequency portion (note
that the frequency portion of the bass region in the original signal plus signal and + R times
signal by phase shift circuits S1 and 82 configured as shown in FIG. 2) The amount of phase shift
that occurs in the channel increases as the frequency decreases, and the phase shift circuit Sl, S2
'-' q- in the illustrated configuration covers the entire frequency range of the target bass range.
Although the phase of the signal is not phase-shifted uniformly by 180 ░ (phase-inverted state
in the ordinary sense) compared to the phase of the original signal, it is not necessary in the
present invention to mean. In the modified signal in which the phase of the bass frequency
portion is inverted, the phase of the required bass frequency portion is changed as compared to
the phase of the original signal as obtained through the phase shift circuits Sl and 82 in FIG. It
also includes deformation signals).
Further, in the above circuit example, a total of four signals of ?L, 10 / ?, ?R9 and Rj? are
obtained from the two phase shift circuits 81 and 82 and supplied to the matrix circuit M.
Because the polarities of the four signals are not always in a fixed relationship but can be freely
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changed depending on the configuration of the phase shift circuit, it is practically obtained from
the phase shift circuit in practice. Naturally, it should be made to obtain two difference signals of
the required form taking into account the polarity of one signal. As described above, in the
pseudo four-channel three-dimensional sound reproducing apparatus according to the present
invention, a means for obtaining a modified signal obtained by inverting the phase of each bass
frequency portion of the input signal for each channel as a device (phase shift circuit 81 , 82),
and respective deformation signals (Ll? signal and M Since the rear signal can be obtained by
the difference signal with the deformation signal R, Z?) and the L signal, the rear signal obtained
is one of the channels. The signal is in the form of (-(L-M.theta.)) In the channel and in the form
of (-(R-.theta.)) In the other channel. The two channel signals (-(L-RZ.theta.)) And (-(R-R2.theta.
Months in the month), modified signals IM.theta. And LZ.theta. Subtracted from the L and R
signals in the above-mentioned backward signals are the R signals as described above. And L
signals are obtained by inverting (changing) the phase of the bass frequency portion containing a
large amount of in-phase components with respect to the phase of the original R signal and L
signal. From the above, each difference signal, ie, (-(L-R / ? month signal and (-(R-Ll? month
signal in the low frequency region portion of the L signal is consequently ((low frequency region
of L signal) + (R (1111111EndPage: bass frequency part of No. 4) + (basal frequency part of R
signal, and ((basal frequency part of R signal) dozens of (basis frequency part of L signal) Appear
in shape and change No. R.theta, the remaining portion was not allowed inversion (change) the
phase in L Party B ? is the made the difference signal of the same signal structure of the
conventional differential signal. Therefore, even if two channels of the backward signal are
obtained by the difference signal method, the obtained backward signal (indirect sound
component signal) sufficiently includes the bass frequency part and has rich presence. You can
get a pseudo 3D sound reproduction sound field.
Further, in the above-described apparatus of the present invention, even if the input signal
applied to the terminals 1 and 2 is a monaural signal, the bass frequency portion in the input
signal is reproduced as a backward signal, so the program source is a monaural signal Even in
the case of, it is possible to create a pseudo multiple sound reproduction field. Next, the four
signals -L, + L ? ?, -R, and 10R ? ? obtained by the two phase shift circuits 81 and 82
described above are mixed to obtain two difference signals. Added to M. An example circuit
arrangement of the matrix circuit M is shown in a block M in FIG. 2. In the figure, a capacitor C3
connected to the emitter circuit of the transistor Q1 and a coupling capacitor C2 connected to
the collector circuit of the transistor Q2 are shown. A resistor R7, a variable resistor VR4 and a
resistor R8 are connected between them to mix the signal -R and the signal element L / ? and
also to a coupling capacitor C1 and a transistor connected to the collector circuit of the transistor
Q1. A resistor R9, a variable resistor VR5 and a resistor RIO 'are connected between the capacitor
C4 connected to the emitter circuit of Q2 to mix the signal and the signal element B, / ?. The
sliders of the two variable resistors VR4 and VR5 in the circuit described above are interlocked
with each other, and the slider of the variable resistor VR5 is connected to the variable resistor
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VR6. , 4 are respectively connected to the variable resistor VR7. At the same time, each channel
signal (-(L-R / .theta.)) Signal in the back signal, which is respectively given to the variable
resistors VR6 and VB7 as the output of the matrix circuit M described above, slides on each other
A variable resistor VR5 whose child is interlocked. By adjusting VR, 4, the level ratio of each
component signal of rl 111 111 in each channel signal can be deviated from the 1: 1 relationship
(the slide of the variable resistors VR, 5 and VB, 4 If the movement is at the middle point of the
variable resistor, the mixing ratio of -L signal and + M? signal and the mixing ratio of -R signal
and + L and 4? signal are in a 1: 1 relationship, but the sliding When the element is shifted from
the middle point position of the variable resistors VB, 5 and VB4, the mixing ratio with the -L-fold
signal R / ? signal and the mixing with the -R signal and the + L / ? signal The ratio deviates
more than the above-mentioned 1: 1 relationship). As described above, the signals in the state
where the mixing ratio of the component signals in each channel signal of the backward signal
obtained by the output of the matrix circuit M is shifted from the relationship of 1 as shown in
FIG. ? (L??R?f? month signal 1.
And (-(R'-L'f.theta.)) Signals. A difference signal between signals obtained by changing each level
of each channel signal of the rear signal by the mixing ratio variable network as described above,
that is, a (-(L'-RZ?)) signal, and (-CB , '-L', & ?)), it is obtained when the signal of each channel
signal of the rear signal is mixed when mixing without changing the level of the signal (1: 1
mixing ratio) In the difference signal), a part of the signal component that is lost is left, so that
the sound quality of the two difference signal types forming the backward signal itself becomes
good, and The sense of localization is increased, and it becomes possible to create a reproduced
sound field that does not give the listener a sense of discomfort or discord. The two channel
signals of the backward signal obtained as the output of the matrix circuit M described above,
that is, the (? (LLR ? ? ?)) signal and the (? (R, ? ? L? Z?)) signal are variable resistors
After being level-adjusted by VR6, VB7, it is applied to channel signal phase shift circuits C8I and
C82 where it provides a phase difference within 90 shells between the two channel signals.
Channel signal phase shift circuits C81 and C82 for giving a phase difference between two
channel signals include a network of a resistor R11 and a capacitor C5 between collectors and
emitters of the transistors Q3 and Q4, and a resistor R12 and a capacitor C6, respectively. The
phase shift circuit may be configured as shown in FIG. 2 which is formed by connecting the
networks of [111111] EndPage: 5 (?. An example of the phase difference characteristic between
two channel signals when channel signal phase shift circuits C81 and C82 having the
configuration as shown in FIG. 2 are used is shown in FIG. Curves 1 and 2 in FIG. 3 are
frequency-phase transition characteristic curves of the channel signal phase shift circuit inserted
and connected to different channels. In the third characteristic example, the phase difference
between the two channel signals of the rear channel is made small in both the bass and treble
areas, but in the practice of the present invention, the bass to treble range is used. The phase
difference between the two channel signals is made uniform over the entire frequency range, or
the phase difference between the two channel signals is selected small only in the bass range,
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and the phase differences in the other frequency parts are Many variations can be taken, such as
uniform dogs.
In the present invention, the two channel signals of the rear signal are (-(L'-R7: ?) l) 1) signal and
(-(R, The reverse signal contained in each channel signal of the rear signal is relatively large by
making '?L 7 ?) 1 2) (however, the phase difference does not exceed 90 ░ at the most) The
phase of the signal component of phase relation is shifted from the relationship of reverse phase,
and the sound in the reproduction sound field by the rear signal is localized to some extent, and
the sound of the indirect sound component by the reproduction of the rear signal is grouped In
addition, it can be closely approached to natural things with a sense of expansion. Since the
backward signal obtained as described above is formed by the difference signaling method, its
signal level is unduly low compared to the signal level of the front signal, so it is appropriate to
reach the required signal level. It is necessary to amplify. In addition, since the backward signal
obtained by the difference signal method contains many high frequency components, distortion,
noise and the like, the signal relative to the backward signal is made to be closer to the actual
indirect sound. It is desirable to apply frequency characteristic compensation means Iv). Blocks
ACI and AC2 in the figure are amplification and frequency [111111] compensation circuits for
each channel signal of the rear signal, and for example, as shown in FIG. It may be a combination
type of an amplifier circuit according to Q6 and a CR type tone control circuit of a known
configuration comprising resistors R13 to R20 and capacitors C7 to CIQ switches 8W1.8W2. The
above amplification and frequency characteristic compensation circuit Act. The respective
channel signals of the rear signal passing through the AC2 are outputted from the output
terminals 5 and 6 of the rear signal generation circuit B. In the pseudo 4 channel 3D sound
reproduction signal generator according to the present invention, it is apparent from the detailed
description described above that the bass frequency portion of each of two signals having sound
information content portions related to each other. By using the phase-inverted intangible signal
as one of the two signals in the back signal of the difference signal format as one signal, it is
possible to fully include the bass frequency portion in the back signal, and to feel unpleasant or
disparate. It is possible to give the listener a rich sense of reality without feeling, and by changing
the level ratio of the signals in the two channel signals in the rear signal using an active matrix
circuit with a variable mixing ratio, While the sound quality of the signal itself of the two
difference signal formats that form the signal is improved, the sense of stability of the entire
reproduced sound field is increased.
It is possible to create a playback sound field that does not give a sense of discomfort or
discordant to the listener, and furthermore, up to 90Of! Between two channel signals in the rear
signal. -By giving a phase difference within the range not exceeding, the sound in the
reproduction sound field by the rear signal is localized to some extent, and the sound of the
indirect sound component obtained by the reproduction of the rear signal has a lump and In
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addition to being able to closely approximate natural indirect sound with a sufficient sense of
expansion, the amount of crosstalk between the signals that make up the front signal is variable,
and the localization of the reproduced sound is moved relative to the back and forth direction of
the reproduced sound field. The amount of crosstalk between the signals that make up the front
and back signals can be varied, so that, for example, the so-called 4-channel matrix program
source or the phase that changes from moment to moment to indirect sound components When
using a program source or the like in which a signal form adapted to give a change is adopted,
there is an interval between before and after in the reproduction sound field It is possible to take
a degree of separation [111111] EndPage: 6 and therefore it is possible to create a good pseudo
3D sound reproduction field even using such a program source, and furthermore also a program
source Even if the signal is a monaural signal, it has features such as being able to create a threedimensional reproduced sound field.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of a pseudo 4 channel 3D
sound reproduction signal generator according to the present invention, FIG. 2 is a circuit
diagram of one embodiment of the same, and FIG. 3 is a characteristic curve side of a channel
signal phase shift circuit. It is. Waa444411.2 of ...... input signal terminal, 3,4,5,6 ...... output
terminal, Ql, Q2?Q6 ...... transistor, R1, R2-R20 и и ииииии Resistance, CI, 02 to CIO иии и и и Conden f,
VRI, VR, 2 to VR, 7 и Curve и variable resistor, AI, A2 и и и и и и Front signal amplification circuit, B
generating circuit ...... backward signal, C ...... crosstalk amount variable adjusting circuit, F ......
front signal generating circuit, M иии 82. Matrix circuit 81.82 Phase shift circuit ACI, AC2
Amplification and frequency characteristic compensation circuit C8I C82 Channel...
???????????????? ?
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