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o 4 channel record recording and playback type ■ Japanese Patent Application No. 45-58314
[phase] Application No. 45 (1970) July 5 @ inventor Masaaki Sato 12 12th Victor Co., Ltd.
Moriya-cho, Kana-ku, Yokohama-shi Noriaki Takahashi The same office 0 applicant Japan Victor
Inc. Yokohama city Kanagawa-ku Mori-cho 3 Kanagawa agent Attorney Ito Tadahiko
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block system diagram of a conventional
system, FIG. 2 is a block system diagram of one embodiment of the present invention system, FIG.
3 is a diagram for explaining an original sound field, and FIG. FIG. 5 is a diagram for explaining
the influence of crosstalk in the reproduction sound field.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a four-channel
record recording / reproducing system, and in a transmission system for combining a FM (or PM)
wave with a direct wave to record a four-channel signal on a record and reproduce it, FM (PM)
An object of the present invention is to provide a recording / reproducing system capable of
eliminating the beat interference due to the crosstalk of the transmission system by making the
wave single and improving the performance and simplifying the configuration of the
transmission system. FIG. 1 shows a block diagram of a conventional 4-channel record recording
/ reproducing transmission system for recording / reproducing FM (or PM) waves combined with
direct waves. The two-channel signals A and B from the input terminals 1 and 2 are supplied to
the matrix circuit 5, and the other two-channel signals C2D from the input terminals 3 and 4 are
supplied to the matrix circuit 6, respectively. It is synthesized. The respective sum signals (A + -B)
and (C + D) from the matrix circuit 5 ° 6 are supplied to the mixer 11.12 via the amplifiers 7
and 8 respectively. The respective difference signals (A-B) and (C-D) from the matrix circuits 5
and 6 are respectively FM (or PM) modulated by the modulator It is mixed with the
sum signal. The left channel composite signal and the right channel composite signal of the
respective outputs of the mixers 11 and 12 are respectively recorded on the record 13 in a 4545 system by a cutting machine. Of the signals reproduced by the pickup from the record 13, the
direct wave sum signals (A to B) and (C to D) are respectively supplied to the matrix circuit 18.19
through the amplifiers 14 and 15, and the FM difference signal (A B) and (C-D) are respectively
demodulated by the demodulators 16 and 17 and supplied to the matrix circuits 18 and 19. Each
of matrix circuits 1B and 19 is 2A. The signals of 2B, 2C and 2D are separated into 4 channel
signals and taken out from output terminals 20 to 23, respectively. In the recording /
reproducing transmission system of the above configuration, when crosstalk occurs, interference
between the sidebands of the FM waves of the left and right channels causes beat interference,
which significantly deteriorates the sound quality. Also, in the FM (or PM) wave, the deeper the
modulation, the thicker the sideband (and the more the bead interference, the limit of preemphasis and rope-staging in the recording system, S / N There is a problem that there is a limit
to improvement. The system of the present invention solves the above-mentioned problems, and
FIG. 2 shows a block diagram of one embodiment thereof. Signals A to D of four channels are
supplied to the matrix circuit 24 from the input terminals 1 to 4 respectively.
Here, the signals A to D are signals of four sound sources A to D which form an original sound
field in the arrangement shown in FIG. 3 as shown in FIG. The four channels of signals A to D are
two sum signals represented by the following equation by the matrix circuit 1. It is converted
into R and one difference signal M. [111111] EndPage: 1 Of these, the sum signal is composed of
only L or R channel information as shown by the equations (1-1) and (1-2), and each is amplified
by the amplifiers 25 and 26. The mixture is then fed to a mixer 28. The difference signal M is FM
(PM) modulated by the FM (or PM) modulator 27 and then supplied to the mixer 28. In the mixer
28, the sum signal of the direct wave, the difference signal M of the R and FM (PM) waves are
mixed, and the FM (PM) wave by the (A + B) difference signal M and the (C 10 D) difference
signal FM (PM) wave by M [111111] If a sound field is formed by these four information signals
I to 4, it becomes as shown in FIG. As described above (the sound field formed as shown in FIG. 4
by the reproduced signal has an apparent crosstalk component as shown in equation (2) for each
sound source as compared with the original sound field shown in FIG. Have. However, for
reasons to be mentioned below, this West Stokes component has no adverse effect on 4-channel
sound field reproduction. That is, first, in order to simplify the explanation, the case where no
energy is emitted from the sound sources B, C, D will be considered. As the reproduced sound
source according to the present invention system in this case, as apparent from the above
equation (2), the sound is recorded in the grooves of the W11'll'll'4545 system corresponding to
the original sound field sound source A, respectively. At this time, the FM (PM) wave is recorded
in monaural. Next, at the time of reproduction, of the signals reproduced from the record 29 by
the pickup, the sum signals L (−A × B) and R (= C × D) are respectively amplified by the
amplifier 30.31 and then transmitted to the matrix circuit 33. Supplied. Further, the FM
difference signal is demodulated by an FM (PM) demodulator 33, converted into an information
signal of a difference signal M of (A + C)-(, A + D), and similarly supplied to the matrix circuit 33.
The above sum signal, R and difference signal M are converted into four information signals of
{circle around (1)}, {circle over (2)}, {circle over (2)} and {circle around} in Taken out. The same
sound is reproduced as A, and at the same time, the sound sources A and B each have crosstalk
(all have equal energy due to crosstalk, and the sound sources A and B have listening positions
38 and 38 Since the sound source I is symmetrical with respect to the tie line 1 and the signal A
of the desired sound source I has an energy four times the energy of the crosstalk component,
the direction of the sound source as a whole is on the line l. There is a sound source at a position
that is substantially I, [111111] EndPage: 2 and so on.
The same applies to the other sound sources I to ■. Accordingly, although the crosstalk
component is apparently detected in the above equation (2), the crosstalk component does not
have any adverse effect when it is substantially reproduced in the sound field. According to the
multi-channel record recording / reproduction method according to the present invention, as in
the case of -b, there is crosstalk in the recording / reproduction transmission system because
only one angle modulation wave obtained by modulating the carrier wave is used. Even if there is
no beat interference due to interference between the two modulation waves as occurs in the
conventional method (all do not occur, (2) there is no heat interference, so the modulation is
deepened by pre-emphasis and lobe strike, S / N (3) In the conventional system, two channels of
modulators and demodulators are required, but according to the present invention, only one
channel of both the modulator and the demodulator is required, and the recording system and
playback Both systems have features such as extremely simplified circuit configuration.
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