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JPS5023964

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DESCRIPTION JPS5023964
■ Four-channel stereo sound field creation method ■ Japanese Patent Application No. 45109089 [Phase] Application No. 45 (1970) Dec. 9 榛 Akira Shibata-13 13 13 Trio Co., Ltd. in
Ota-ku, Tokyo Tokyo @ Applicant Trio Co., Ltd. Tokyo Meguro-ku Aobadai 3 6 17
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of a 4-channel stereo sound
field creating method according to the present invention, FIGS. 2, 3, 4, 5 and 6 are for explaining
the present invention. FIG. 7 is a phase shift characteristic diagram showing the characteristics of
the phase shifter used in the practice of the present invention, and FIG. 8 is a circuit showing one
embodiment of an encoder used in the four channel stereo sound field creation method
according to the present invention. FIG. 9 is a circuit diagram showing an embodiment of a
decoder used in the 4-channel stereo sound field creating method according to the present
invention.
DETAILED DESCRIPTION OF THE INVENTION (A) Object of the Invention The present invention
converts four-channel stereo signals into conventional two-channel stereo signals, and transmits,
records, reproduces them by the conventional two-channel stereo signal medium, and the twochanel stereo The present invention relates to a four-channel stereo sound field creating method
for further converting a signal into a four-channel stereo signal. Recording of 4 channels stereo
signal, now! Various methods and devices have been invented and devised, but some of these
methods and devices use a conventional two-channel stereo signal medium, such as a
conventional FM stereo system, stereo record, stereo tape, etc., as a medium for signal
transmission. It has the disadvantage that it is impossible and that it can not use the conventional
recording and reproducing method and apparatus and is not compatible with the conventional
two channel state [111111] Leo. SUMMARY OF THE INVENTION The above-mentioned
drawbacks are eliminated, and even a 4-channel stereo signal can be transmitted and recorded
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using a conventional 2-channel stereo signal medium, and a conventional 2-channel stereo signal
can be reproduced as a pseudo 4-channel stereo signal To obtain a compatible 4 channel stereo
sound field creation method. (B) Constitution of the Invention First, the present invention will be
described in detail based on the block diagram shown in FIG. 1 and the explanatory diagrams
shown in FIGS. In FIG. 1, 1 is a four-channel stereo signal (front left signal FL1 front light signal
FR, rear left signal RL% rear light signal RR ') input end as'E of 2C, d, matrix M1sM2 and two
channel stereo signal A 4-channel encoder comprising output terminals e and f, 2 a conventional
2-channel stereo signal medium using a conventional FM stereo system, stereo record, stereo
tape, etc. 8 is a 4-channel decoder, which is a 2-channel stereo signal Circuit connection 3 with
input terminals g, h, output terminals i, j of front left signal FL 1 front light signal FR of 4
channels stereo signal, phase-shift dividers 4, 5, matrix M32 M4, phase shifters 6, 7, 4 Channel
stereo signal left signal R4, s rear light signal The output terminal k of the RR. It consists of one.
Generally, when there are sound fields based on signals A, B, C and D from four sound sources as
shown in FIG. 2, the front left speaker in the reproduction speaker system of four channels stereo
signal shown in FIG. Although front left signal FL1 front light signal FR and rear left signal RLz
rear light [111111] EndPage: 1 signal RR are emitted from SP1, front light speaker SP2, rear left
speaker SP3 and rear light speaker SP4, respectively. For example, in the front left signal FL, it is
desirable not to include the component of the signal from the all sound source on the diagonal
and that the component of the signal A be included at a higher level than the components of the
signals B and C from both adjacent sound sources. Be
Taking this point into consideration, the front left signal FL1 and the front light signal FR are
now FnA + B + C, n) 1 (1) -FR = nB + AnD, n ,> 1 ........... (2). Next, a rear left signal RL% rear light
signal RR equivalent to the structure of the equations (1) and (2) is represented by RL = nC + A +
D, n> 1. ) RB = nD + B + C, n) 1... If attention is paid, the terms nC and nD are obtained from the
following operation of the equations (1) and (2). nFL-FR = (n2-1) A + nC-D = (5) nFRFL = (n21) B
+ nD-C = "" (6) (5) The structure of the formula (6) is (3), (4) and In order to be equivalent, (n2-1)
= 1 is sufficient. That is, the condition to be obtained when (n2-1) -1, n) 1 is n-V / d is satisfied.
Therefore, the equations (1) to (4) can be rewritten as follows. FL-/ 'Th + B + c--------------------------------------------------------------------------------------------------- RL--, / 2FL-FR = V / TC-10 AD-(3) 'RR = V /
2FR-FL = v' D + B-... ... Mixing the signals A, B, C, D from (4) ', that is, four sound sources, as in
(1)', (2) ', and converting them into a two-channel stereo signal This is required as the operation
of the four channel encoder 1 of FIG. Now, the input ends a and b of the 4-channel encoder 1. If
the signals A, B, C, and D are added to ctd as the respective channel signals of four-channel
stereo signals, respectively, the signals A, B, and C are mixed at a ratio of V / 2: 1: 1 by the matrix
M0 (1 7) Convert the left-hand signal of a two-channel stereo signal which is expressed by
equation 7 into the signal B by the matrix M 2 as well. [111111] A and D are mixed at a ratio of
V'2: 1: 1, respectively, and converted into a light signal of a two-channel stereo signal expressed
by equation (2). These two-channel stereo signals are respectively recorded and reproduced by a
two-channel stereo signal medium 2 from the output terminals e and f, for example, a
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conventional stereo record, stereo tape, etc., recording and reproduction medium A, B, C. Each of
D is emitted from the left speaker SPLs and the right speaker SPR in FIG. 4 and can be localized
to the listening position M as shown in FIG.
Then, in order to obtain the signal expressed by the equations (3) 'and (4)' from the signals of the
equations (1) 'and (2)', the four channel decoder 8 shown in FIG. 1 is added. Here, a front left
signal of a four-channel stereo signal such that the two-channel stereo signal applied to the input
terminals g and h of the four-channel decoder 8 is as it is by the circuit connection 3 It is
obtained at the output terminals i and j as the FL1 front light signal FR. The left signal and the
right signal of the two-channel stereo signal expressed by the equations (1) 'and (2)' are
respectively divided into opposite phase signals by the phase dividers 4 and 5, and the divided
left signal The light signal is mixed with each other at a ratio of & z: 1, converted into a signal
expressed by the equation (3), and obtained at the output terminal k as a left signal RL of a fourchannel stereo signal. Similarly, the phase-divided right signal and left signal are mixed at the
ratio of V /: z: 1, respectively, converted into the signal according to equation (4) 'and output as
the four-light stereo signal RR. Get to the end l. Next, the signals A, B, C, and D from the four
sound sources are contained as 4-channel stereo signals in each channel at what level and
emitted from each speaker according to FIG. Considering that, in the case of the A signal, as
shown in FIG. 5 (1), if it is radiated by the amount of 2 from the speaker SP1, it is radiated by 1
amount from the speaker SP2zSP3 of the adjacent channel, and the speaker SP1 It can be seen
that no radiation is generated from the speaker SP4 of the diagonally opposite channel. As is
apparent from FIGS. 5 (2), (3) and (4), the other B, C and D signals are emitted at the same ratio,
with the respective speakers SF 3, SF 3 and SF 4 as the center, as apparent from FIGS. .
Therefore, the localization of the sound image of each channel signal in the sound field creation
by the 4-channel stereo signal obtained at 1 at the output end 1jJj [111111] EndPage: 2 of the
four-channel decoder 4 is shown in FIGS. It becomes like that, and keeps localization in the
direction that should be originally. Also, as can be understood from the equations (3) ′ and (4)
′ in the 4-channel stereo signal passed through the 4-channel decoder 8, the rear left signal RLs
and the rear light signal RR contain signal components of −D and −C respectively , -D and -C
are respectively obtained by 180-degree phase inversion of the signal component C. Thus two
speakers SP3.
When C or D of the same signal is radiated from SP4 in opposite / phase, both signals are
spatially combined, and localization in auditory sense is extremely separated to the outside from
the position of both speakers SP3 し ま い SF3 and aurally Give a feeling of discomfort. In order
to further improve this point, in the flock diagram shown in FIG. 1, the rear left signal RLz and
the rear light signal RR which is the output signal of the matrix M32M4 are added to the phase
shifters 6 and 7 respectively to The phase difference is 180 degrees out of phase by about 90
degrees, and the output terminal is corrected to '1' or the left signal RL. Take out the rear light
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signal RR. It is aurally effective to perform this phase shift in a low frequency range of about f =
100 Hz-f = I KHz. Next, an embodiment of a 4-channel encoder used in the 4-channel stereo
sound field creating method according to the present invention will be described with reference
to FIG. (Structural parts identical to those in FIG. 1 are denoted by the same reference numerals.
Front left signal FI and s front light signal FRN rear left signal RL among 4-channel stereo signals
applied to input end ajb3ejd have resistances R □ and R2yR3 of matrix M0, for example, 33 Ω
and 47 Ω respectively. , 47 mixed at a ratio of V / 2: 1: 1, the output end eK is converted into a
left signal k of a two-channel stereo signal which can be expressed by equation (1). Similarly,
among the four-channel stereo signals applied to the input end ajb9e9d, the front light signal FR
and the front left signal FL1 rear light signal RR have resistance values of the resistances R □ ′,
R2 ′ and R3 ′ of the matrix M2, for example, respectively 33 and Ω. , 47 to Ω. The signal is
mixed at a ratio of V2: 1: 1 by selecting Ω as 47, and converted into a light signal of a twochannel stereo signal that can be expressed by equation (2) 7 at the output end f [111111]. Next,
an embodiment of a 4-channel decoder used in a 4-channel stereo sound field creating method
according to the present invention is shown in FIG. 9 and described. (Structural parts identical to
those in FIG. 1 are denoted by the same reference numerals. When left and right signals of a twochannel signal according to equation (1) 'j (2)' passed through the two-channel stereo signal
medium 2 are added to the input terminals g and h, four channels are respectively maintained by
the circuit connection 3 The front left signal FL of the stereo signal and the front light signal FR
are obtained at the output terminals i and j. The left signal and the right signal of the two-channel
stereo signal are divided into opposite phase signals by the phase dividers 4 and 5, respectively,
and the resistances of the resistors R4, R5 and R4 ', Rb2 of the matrix M3sM4 are respectively
set to 33, for example. , 47k, mixed at the ratio of V'2: 1 and output signals to the output
terminal are respectively the signals (3) 'and (4)' of the 4-channel stereo signal relative signal
RLs'. ) Obtained as a light signal RR.
Here, when the signal of 1 is applied to the phase shifters 6 and 7 respectively at the output end,
the phase shift characteristics as shown in FIG. 1 are obtained at the output end and the left
signal RLz rear light signal RR. Is obtained. 2 → Effects of the Invention The specific effects of the
present invention will be described below. In the present invention, when converting a 4-channel
stereo signal to a 2-channel stereo signal, the signals of only 3 channels in the 4-channel stereo
signal are mixed at a unique mixing ratio of V'2: 1: 1 to 9 (1 2) using an encoding method for
converting into a two-channel stereo signal, and the two-channel stereo signal passed through a
two-channel stereo signal medium is a front left signal of a four-channel stereo signal as it is.
Since the signal is decoded as a front light signal, the separation characteristic between the
reproduced front signals is good. This can be achieved by simply decoding the 2-channel stereo
signal from the conventional 2-channel stereo medium according to the decoding method of the
present invention as a left signal or a light signal, and the conventional 2-channel stereo sound
field creation is also possible. It means that there is. [111111] EndPage: 3 In the present
invention, the left channel signal RLN rear light signal RR of the four channel stereo signal is
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represented by the equations (3) ′ and (4) 7 according to the unique mixing ratio of the two
channel stereo signal to V2: 1. Since each channel stereo signal which has been decoded has a
completely equivalent structure consisting of three sound sources, as is apparent from the
equations (1) 'to (4). And the sound images of the respective channel signals are ideal fourchannel localized in the direction that should be originally as shown in FIG. 6 (1 to 6 (4)) without
including the signals of the sound sources diagonally opposite to each other. Create a stereo
sound field. As described above, according to the present invention, a 4-channel stereo signal is
recorded, reproduced and transmitted by a conventional 2-channel stereo medium, and sound
field generation is possible as a 4-channel stereo or a 2-channel stereo. There is a sound field
creation method completely compatible with 2-channel stereo and 4-channel stereo, and further
decoded or the left signal RL and the rear light signal RR contain the same sound source signals
in antiphase with each other. If the phase shifter corrects the noise in the low frequency range,
the rear left signal RL1 rear light signal RRO sound image is extremely separated to the left and
right and localized to the outside of the rear signal speaker SP3sSP4 to give an unpleasant
feeling in hearing. It is preventing.
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