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JPS5220321

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DESCRIPTION JPS5220321
? Decoding method in 4-channel stereo sound field creation ? Japanese Patent Application No.
50-82885 [phase] Application No. 45 (1970) December 9 O Division 0 of Japanese Patent
Application No. 45-109089 Shibata-Man Tokyo Ota Ward Chidori 13 13 Trio in 1 Tokyo Office 0
Applicant Trio Co., Ltd. Tokyo Meguro-ku Aobadai 3 6 17
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of a four-channel stereo sound
field creating apparatus using a decoding method according to the present invention, FIG. 2, FIG.
3, FIG. 4, FIG. FIG. 7 is a phase shift characteristic diagram showing the characteristics of the
phase shifter used in the implementation of the four-channel stereo sound field generating device
shown in FIG. 1, and FIG. 8 is the four channel in FIG. FIG. 9 is a circuit diagram showing an
embodiment of an encoder which concretely implements an encoding method in a stereo sound
field creation apparatus, and FIG. 9 is a circuit diagram showing an embodiment of a decoder
which concretely implements a decoding method according to the present invention. .
DETAILED DESCRIPTION OF THE INVENTION (Object of the Invention) The present invention
converts a four channel stereo signal into a conventional two channel stereo signal and transmits
and records it by means of a conventional two channel stereo signal medium. The present
invention relates to a decoding method in 4-channel stereo sound field creation for reproducing
and further converting the 2-channel stereo signal into a 4-channel stereo signal. Various
methods and devices for recording and reproducing four-channel stereo signals have been
invented and devised, but depending on these methods and devices, conventional two-channel
stereo signal media, for example, conventional FM stereo [111111] system, stereo record
However, stereotapes and the like can not be used as media for signal transmission, and
conventional recording and reproducing methods and devices can not be used, and there is a
disadvantage that they are not compatible with conventional two-channel stereo. SUMMARY OF
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THE INVENTION The object of the present invention is to solve the above-mentioned drawbacks,
and it is possible to transmit even a four-channel stereo signal using a conventional two-channel
stereo signal medium and reproduce the conventional two-channel stereo signal as a pseudo
four-channel stereo signal. It is to obtain the decoding method in the 4 channel sound field
creation which has sex. (Structure of the Invention) In general, when there are sound fields based
on signals A, B, C and D from four sound sources as shown in FIG. 2, a speaker system for
reproducing 4-channel stereo signals as shown in FIG. In the front left speaker SPY, the front
right speaker SP2, the rear left speaker SP3, and the rear right speaker SP4, the front left signal
FL, the front light signal FR, the rear left signals R and L, and the rear light signal RR are
respectively emitted However, for example, the front left signal FL does not include the
component of the signal from the diagonal source, and the component of the signal A is included
at a higher level than the components of the signals B and C from both neighboring sources. Is
desired. Taking this point into consideration, the front left signal FL1 front signal FR is set to F1,
= nA + B + C, n> 1 = = '(1) I' J L-n B + A + D, n> 1 = = (2). Next, the left signal R, L and the rear
light signal RR, which are equivalent to the structure of the equations (1) and (2), are obtained.
?????????????????????????????????????????
???????????????????????? Focusing on nD in nC1 (4) in equation (3),
the terms nC and nD are obtained from the following operation of equations (1) and (2).
nFI, -FR = (n2-1) A ? nC-D- (5) nFR--Fr, = (n2-1) B ? nD-C-".- '(6) L fertilizer 5), In order to make
the structure of the equation 6) equivalent to the equations (3) and (4), it is sufficient that (n2-1)
= 1. ????? (N2-1) = 1. The condition to be obtained when n = n from n> 1 is satisfied.
Therefore, the equations (1) to (4) can be rewritten as follows. 1 ?L = EA B B ? ? ? ? ? C
........... (1) / F publication-\ HB + A + D-----=-(zYR, L = JC + A- D иииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии
(4) 'from four sound sources Signals A, B, C. When D is transmitted by a transmission system and
reproduced by four speakers SP +, SF3, SPs, SF3 again. Signal A if the decoded signals Fr, FR, PvL,
and RR represented by the above formulas (1) ', (2)', (3) ', and (4)' are emitted. A 4-channel stereo
sound field will be created in a form close to the original 4-channel stereo sound field by B, C and
D. By the way, the equations (3, Y ', (4)') can be rewritten as follows. R, L = l / E2FL-Fa (3) ? R, f
(, -? FR-FL) ... (4) // Therefore, in the 4-channel stereo sound field creation, the signals A, B, C, D
from the four sound sources are 2-channel signals FL represented by the above equation (1) /,
(2) 7 . If it is encoded by FR and transmitted, only 2 channels of transmission system are
required, and furthermore, encoded 2 channel signal Fl, and FR can be decoded as expressed by
the above 3) //, (4) ?equation It would be possible to create a 4-channel stereo sound field
again. Now, FIG. 1 is a block diagram of a 4-channel stereo sound field creating apparatus using
the decoding method according to the present invention, in which 1 is a signal A from 4 sound
sources. A four-channel encoder consisting of B, C and D respective input ends a, b, c and c, a
matrix M, and M and M and an output end e for obtaining a two-channel stereo signal, 2 for
example a conventional FM stereo System, 2-channel stereo signal medium used for transmission
of stereo records, stereo tapes, etc., 8x4 channel stereo decoder, input ends g and h of 2 channel
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stereo signal, front reflex of 4 channel stereo signal) Three circuit connections including output
terminals i and j of signal FL and front light signal FR, phase dividers 4 and 5, matrix M3 ░ M4,
phase shifters 6 and 7, and rear left signal R of four channel stereo signal , L, and t at the output
end of the rear light signal RR.
Now, 4 channel encoder 10 input end a. b, c and d are signals A from four sound sources
respectively. When B, C and D are added, the signals A, B and C are mixed in the ratio of ?: 1: 1
by the matrix M1 and converted to the left signal of the two-channel stereo signal represented by
the equation (1). Similarly, the signals B, A and D are mixed at a ratio of ?: 1: 1 by the matrix M2
and converted to a light signal of a two-channel stereo signal represented by the equation (2).
The left signal and the right signal of this two-channel stereo signal are transmitted by the twochannel stereo signal medium 2 from the output terminals e and f, respectively (for example,
recording and reproducing with a conventional stereo record, stereo tape, etc.), When radiated by
the left speaker SPL and the right speaker SPR shown in FIG. 5, the signals A, B, C and D are
localized to the listening position M as shown in FIG. Therefore, in order to obtain the signals
expressed by the equations (3 ') and (4)' from the signal of the section (4 'equation), the left
signal and the right signal of the two-channel stereo signal passed through The channel deco 80
has an input end g and b to b. Then, the left signal of the two-channel stereo signal applied to the
input terminals g and h and the right signal rllllllllEndPage: No. 2 are as they are by one-circuit
connection 3 and the four-channel stereo signal as represented by equation (1) /, (2) Output
signal as a front light signal FL and a front light signal FR. Obtained by j. The left and right
signals of the two-channel stereo signal applied to the input terminals g and h are phase-divided
by the phase dividers 4 and 5 respectively to obtain signals in antiphase with each other. Then,
the left signal from the phase divider 4 and the light signal in the opposite phase from the phase
divider 5 are mixed by the matrix M3 at a ratio of 1/2: 1, respectively, and converted to the
signal represented by the equation (3) ' Then, it is obtained at the output terminal k as a 4channel stereo signal slave signal R, L. Similarly, the matrix M4 mixes the light signal from the
phase divider 5 and the antiphase left signal from the phase divider 4 at a ratio of 17T: 1,
respectively, and converts it into a symbol represented by equation (4). Then, they are obtained
at the output end 1 as rear light signals R, R of a 4-channel stereo signal. Next, the signals A, B, C,
D from the four sound sources are 4-channel stereo signals Fl, FR, respectively. Considering what
ratio levels are contained in each of the R, L, R, and R channels and emitted from each speaker, as
shown in FIG. 5 in the case of the A signal. If it is radiated from the speaker SPl by an amount of
2, the speakers SP2.
It can be seen that all (non-radiation) is emitted from the speaker SP4 of the channel on the
diagonally opposite side of the speaker SP + that is radiated by an amount of 1 from SP3. For the
other B, C and D signals, as is apparent from FIGS. It is radiated around SF3. Therefore, the
localization of the sound image of each channel signal in the sound field creation by the four
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channel stereo signal obtained at t becomes as shown in FIGS. It keeps localization in the Further,
in the 4-channel stereo signal passed through the 4-channel decoder 8, as shown in equations (3)
'and (4), the rear left signals R and L and the rear light signal RR include signal components -D
and -C, respectively.
(иииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии и и и signal
component C is 180 degrees phase inverted. Thus two speakers SP3. When C or D of the same
signal is radiated from SP4 in opposite phase to each other, both signals are combined in space
11111111, the localization in auditory sense is extremely separated to the outside from the
position of both speakers SP3 ░ SF3, and auditory discomfort Give a feeling. In order to further
improve this point, the rear left signal RL and the rear light signal RP? which are output signals
of the matrix Ms 2 M 4 in the block diagram shown in FIG. 1 are respectively added to the phase
shifters 6 and 7 as shown in FIG. The phase difference between the two signals is shifted by
about 90 degrees by about 90 degrees, and corrected to ', t' at the output terminal, and the left
signal RJ and the rear light signal Rt-t are taken out. It is aurally effective to perform this phase
shift in the low frequency range of about f-100H2 to f-IKH2. Next, an embodiment of a 4-channel
encoder which concretely implements the encoding method in the 4-channel stereo sound field
creating apparatus of FIG. 1 is shown in FIG. 8 and described. (Structural parts identical to those
in FIG. 1 are denoted by the same reference numerals. Front left signal FI, (= A), front light signal
FR (?B), rear left signals R, L (?C) among the original four-channel stereo signals applied to the
input terminals a, b, c, d Are mixed at a ratio of n: 1: 1 by selecting the resistances of the resistors
R ,,, R, 2, R, 3 of the matrix M1, for example to 33, to 47, to 47 for ? respectively At the end e, a
left signal of a two-channel stereo signal which can be expressed by the IY system is obtained.
Similarly, among the original four-channel stereo signals applied to the input terminals a, b, c, d,
the front light signal FR (-B), the front left signal 1'i'T, (-A), the rear light signal R1 ((= D) is mixed
at a ratio of E: 1 1: 1 by selecting resistances of resistances R?1 ░ R4 and R?3 of matrix M2 to,
for example, 33 ?, 47 ?, and 47 ?, respectively. At the output end f, a light signal of a twochannel stereo signal which can be expressed by equation (2) is obtained. Next, one embodiment
of a 4-channel decoder which concretely implements the decoding method according to the
present invention is shown in FIG. 9 and described. (The same components as in FIG. 1 are
denoted by the same reference numerals as in FIG. 1. The left end of a two-channel stereo signal
is represented by (1) /, (2) 7 type via two-channel stereo signal medium 2 at the input end gth
When a signal is added, it is obtained as it is as a front left signal F1 of a 4-channel stereo signal,
and as a front light signal FR at the output terminals i and j, as it is, by one circuit connection 3,
respectively. Also, the 2-channel left signal [1111111 EndPage: Left and right signals of the 3minute signal are respectively phase-divided by the phase dividers 4 and 5 to obtain opposite
phase signals, and the resistors R4, R5 and R'4 of the matrix M32M4 . The resistance value of R'5
is mixed at a ratio of E: 1 by selecting, for example, 33 KQ and 47 as ? respectively, and at the
output end, t is respectively given by (3) / (4) 7 A signal is obtained as a 4-channel stereo signal
rear left signal R, L and a rear light signal RR. Here, when the signals from t are respectively
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applied to the phase shifters 6 and 7 at the output end, the phase shift characteristics as shown
in FIG. 1 are obtained at the output end and the clear signal RL and rear light signal are shown.
RR is obtained. (Effects of the Invention) Specific effects of the present invention will be
described below. In the present invention, when converting a 4-channel stereo signal to a 2channel stereo signal, the signals of only 3 channels in the 4-channel stereo signal are mixed at a
unique mixing ratio of E: 1 (1) ?, (2 7) The two-channel stereo signal converted from the twochannel stereo signal medium using the encoding method for converting into a two-channel
stereo signal represented by equation 7 is directly decoded as the front signal and front light
signal of the four-channel stereo signal. Because of this, the custom-made separation between the
two front signals reproduced is good.
This means that if the 2-channel stereo signal from the conventional 2-channel stereo medium is
decoded by the decoding method of the present invention, all (as it is left signal and right signal,
it is possible to create the conventional 2-channel stereo sound field as well). I mean. Further, in
the present invention, a 2-channel stereo signal is decoded into a left channel signal R, L of a 4channel stereo signal and a rear light signal RR which are expressed by the equations (3)-(4)
according to a unique mixing ratio of ?: 1. Since the method is used, each of the decoded fourchannel stereo signals has a completely equivalent structure in which each channel signal is
composed of three sound sources, as is apparent from (1) ? ? (4) ?. The sound image of each
channel signal is localized in the direction that should be originally as shown in FIG. 6 to FIG. 4
without creating the signal of the sound source on the opposite side to create an ideal 4-channel
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 [111111]
medium, and a sound field is generated as a 4-channel stereo or a 2-channel stereo. It is possible
to obtain a sound field creating method and its device which are completely compatible with 2
channel stereo and 4 channel stereo. Further, if it is corrected in the low frequency domain that
the decoded signal 11 (, L and R light signals R and R contains the signals of the same sound
source in the opposite phase to each other), the rear left signal RL and the rear light The sound
image of the signal RR is extremely separated to the left and right, and is localized on the outside
of the rear signal speakers SPa and SP4, thereby preventing the sense of discomfort from being
perceived.
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