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JPS5219081

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DESCRIPTION JPS5219081
■ Signal transmission method 特 願 Japanese Patent Application No. 46-4440 [Phase]
Application No. 46 (1971) Published February 5 closed 47-30201 @ Akira 47 (1972) November
8 0 inventor Ito Sakai, Tokyo Suginami Ward Izumi 2 14 14 1 Sansui Denki Co., Ltd. Domei
Ishida Co., Ltd. 0 applicant Sansui Denki Co., Ltd. Tokyo 14 14 1 of 1 Takeshi Suzue Takeshi
Suzue A detailed explanation book of invention outside the invention The invention is used in
broadcasting, recording and reproduction on a record board, recording and reproduction on a
tape recorder, wired transmission, etc., converting signals of multiple channels into signals of a
few channels and transmitting them, and It also relates to a signal transmission scheme for
converting signals into multichannel signals. In stereo broadcasting and the like, there is a
method of converting a 4-channel signal into a 2-channel signal, transmitting it, receiving it,
converting it into a 4-channel signal and reproducing it. That is, as shown in FIG. 1, microphones
7f'1frjr'5 rr are piped at four corners of the original sound field 1 at L- and sound is collected to
form four channel signals FL, F "R. Get RL, RR. This 4-channel signal is led to the encoder 2 and
converted into a 2-channel signal of H = L × FL × ΔFR−RL−ΔRRR = FR × ΔFL + RR + ΔRL.
However, ΔFR FR ΔRRΔΔFL, ΔRL are FR and RR. It is a small signal proportional to FL and RL.
The signals of the two channels, R, are transmitted to predetermined locations by the
transmission systems 3 and 4. The transmission systems 3 and 4 are composed of a broadcasting
circuit, a record recording / reproducing system, and the like. The signals transmitted by the
transmission systems 3 and 4 are as follows: [111111] EndPage: 1FL′−10 ΔR = FL (1 + Δ2
[111111]) of four channels of signal FI, ', FR', RL ', Convert to RR '. However, ΔL, ΔR are small
signals in proportion to R, and FL (1 + Δ2) is FL 十 (ΔFL) 2. These four channel signals FL ', RL',
FR '. RR 'is added to the speakers ff', rl ', fr', rr 'placed at the four corners corresponding to the
recording field 10 microphones ffL, rl, fr, rr in the reproduction bath 6 to perform threedimensional reproduction of sound It is. However, in the above method, since the sum and
difference of each signal is appropriately performed, the sound source signal for the middle point
X of the four pee forces fz / and r1 / shown in FIG. Are canceled in the encoder 2 and can not be
reproduced. If L = FL + .DELTA.FR.sup.10 RL-.DELTA. RR, R = FR.sup.10 .DELTA.FL.sup.10 RR-
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.DELTA.
The source signal for the middle point X of rr 'is attenuated in the encoder 2 and the original
localization can not be obtained. Moreover, when the four human power signals FL, RL, FR, RR
are at the same homology level and the four speakers f1 ', r', fr'5rr 'are simultaneously sounded,
these signals can not be transmitted normally. Normal sound reproduction can not be performed.
The present invention eliminates the above-mentioned drawbacks and provides a signal
transmission system that reliably transmits a sound source at any position in the original sound
field and allows all channels to simultaneously transmit the same human power at the same time.
It is something to try. Hereinafter, an embodiment of the present invention will be described with
reference to the drawings (-). That is, as shown in FIG. 3, in one sound field 1, microphones
“fr” and “r′5 rr” are arranged at four locations on the front left, front right, rear left and
rear right and sound is collected to obtain four channel signals FL and FR. , RL. Get RR. This 4
channel chill signal FL, FR. RL and RR are led to the encoder 11 and synthesized in a constant
phase relationship to obtain [1111111 + FR (2Δ) −RL (1−Δ2) [111111] L = FL + ΔFR + / 90
° RL + Z 90 ° ΔRRR ′ = FR ± ΔFL-Z 900 RR-190 It converts into 2 channel signals L / and R
/ which becomes' ΔRL. However, 10 / 900RL1 + / 90 ° ΔRR indicates a signal obtained by
advancing RL and ΔRR by 900 with respect to other signals, -Z 90 ° RR1- / 90 ° ΔRL delays
RR and ΔRL by 90 ° with respect to other signals Show a signal. For example, as shown in FIG.
4, the encoder 11 comprises wide band phase shift circuits 12 to 15, mixing circuits 16 and 17,
and variable attenuators VR1 and VB2, and as shown in FIG. , And the phase shift circuit 13 is
equal to the phase shift circuit 12. The phase shift circuit 14 uses a phase shift characteristic
obtained by adding 90 ° to the phase shift characteristic of i5, ie, a multiphase characteristic
whose phase shift amount is 900 more than the phase shift amount of the phase shift circuits 12
and 15. The phase characteristic is 90 ° slower than that of the phase shift circuit [2, 15].
Therefore, FL is derived as FL through the phase shift circuit 12 and the mixing circuit 16 to the
output terminal 18, and is derived as ΔFL through the phase shift circuit 12, the variable
attenuator VR2 and the mixing circuit 17, and RL is the phase shift. The circuit 13 and the
mixing circuit 16 lead out to the output terminal 18 as 90 ° RL, and the variable attenuator
VR1, the phase shift circuit 14 and the mixing circuit 1 γ lead out to the output terminal 19 as
−Z 90 ° ΔRL.
Further, RR is derived as + / 90 ° ΔRR through the variable attenuator VR1, the phase shift
circuit 13 and the mixing circuit 16 to the output terminal 18 and is derived through the phase
shift circuit 14 and the mixing circuit 17 to the output terminal 19, and FR is a phase shift. It is
derived as ΔFR at the output terminal 13 through the circuit 15, the variable attenuator VR 2
and the mixing circuit 16 and as FR at the output terminal 19 through the phase shift circuit 15
and the mixing circuit 17. Then, the two channels of the signals L / and R / derived from the
output terminal 18 ° [111111] EndPage: 219 of the encoder 11 are transmitted by the
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transmission systems 3 and 4 to predetermined positions. The transmission systems 3 and 4
convert the signals Fr, FR ", RL", and RR 'of four channels of [111111] such as a broadcast line, a
recording disc recording and reproducing system, and the like. However, the value of Δ in the
above equation can be arbitrarily selected within the range of 0 <Δ × 1, and the values of
encoder and decoder can be different values, and FL, FR and RL, RR. Can also take other values.
For example, as shown in FIG. 6, this decoder 20 is configured using a phase inverting circuit
2L22 capable of obtaining an in-phase output and a phase inverting output, phase shift circuits
23 to 26, variable attenuators 27 to 29, and resistors 30 to 33. As shown in FIG. 7, the phase
shift circuits 23 to 26 use a phase shift characteristic reverse to that of the phase shift circuits
12 to 15. Thus, L 'is derived as L at the output terminal 34 through the phase inversion circuit
21, the resistor 30 and the phase shift circuit 23, and is derived as-/ 900 L at the output terminal
35 through the phase inversion circuit 21, the resistor 32 and the phase shift circuit 24. Derived
through the phase inversion circuit 21, the variable attenuator 29 and the phase shift circuit 25
to the output terminal 36 as-(10/90 ° ΔL), and the potash phase inversion circuit 21, the
resistor 30, the variable attenuator 28 and the phase shift circuit 26. Are derived at the output
terminal 37 as ΔL. R ′ is derived as ΔR at the output terminal 34 through the phase inversion
circuit 22, the resistor 33, the variable attenuator 23 and the phase shift circuit 23, and to the
output terminal 35 through the phase inversion circuit 22, the variable attenuator 27 and the
phase shift circuit 24 − (− / 90 ° ΔR) derived through phase inversion circuit 22, resistor 31
and phase shift circuit 25 to output terminal 36 as + / 900 R, and phase inversion circuit 22,
resistor 33 and phase shift circuit 26. It will be. The two channel signals L / and R / transmitted
by the transmission systems 3 and 4 are led to the output terminal 37 as R through [111111] by
the decoder 20.
Thus, four channel signals F: L ', RL', RR 'derived from the output terminals 34 to 37 of the
decoder 20. In the FRM or reproduction bath 6, the speakers fffi ', fr', rf 'and rr' arranged
corresponding to the microphones ff, fr5r 'and rr of the sound recording field 1 are respectively
added to perform three-dimensional reproduction of sound. In the above embodiment, the 4channel signal F ", Fb, Rb2. In Rfe, it is stated that the value of Δ is arbitrarily selected in the
range of 0 <Δ <1, but if there is a blending element electrically or acoustically in the input circuit
of the encoder, the value of Δ in the encoder May be zero. In this way, the loss between the
phase difference components is eliminated by the blending between the respective channels, and
it becomes possible to widen the separation between the respective channels and to obtain
sufficient spreading sound. As described above, according to the signal transmission system
according to the present invention, multi-channel signals which are sum / difference systems are
combined and combined in a fixed phase relationship, converted into minority channels,
transmitted, and combined again into multi-channels. Therefore, there is no loss of information
when converting a signal of a few channels into a signal of many channels, and it is possible to
reliably transmit a sound source at any position in the original sound field and all the channels
have the same human power at the same time. It can be transmitted, and flat frequency
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characteristics can be obtained for all channels, and can be realized inexpensively. In the above
embodiment, the case where 4 channel signals are converted to 2 channels and transmitted and
converted again to 4 channels has been described, but many other [111111] EndPage: signals of
3 channels are used as a few channels in the same manner. It can be converted, transmitted, and
converted again into multiple channels.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing a conventional signal
transmission system, FIGS. 2a and 2b are diagrams for explaining FIG. 1, and FIG. 3 is an
embodiment of a signal transmission system according to the present invention. 4 is a circuit
diagram showing an encoder in the embodiment, FIG. 5 is a diagram showing an example of
phase shift characteristics of a phase shift circuit used in the encoder, and FIG. 6 is a decoder in
the embodiment described above FIG. 7 [111111] rl111111 is a diagram showing an example of
the phase shift characteristic of the phase shift circuit used for the same decoder. 11・・・・・
・エンコータ、20・・・・・・デコーダ。 [Phase] Cited Reference Publication No. 50-17843
Radio Science November 1970 issue page 53-55 Japan Broadcasting and Publishing Association
published [111111] [111111] EndPage: 4
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