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■ Signal transmission method ■ Japanese Patent Application No. 45-121490 [phase]
Application No. 45 (1970) December 29 @ inventor Takahashi Satoshi Tokyo Metropolitan
Government Tokyo cedar district Izumi 2 14 14 1 Sansui Electric Co., Ltd. O applicant Sansui
Electric Co., Ltd. Company 1 Tokyo 14 Suginami Ward Izumi 2 1 [phase] Attorney Attorney
Takeshi Suzue 3 people outside
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a system diagram showing an embodiment of a
signal transmission system according to the present invention, and FIG. 2a, b to 4 ayb are
diagrams for explaining the operation of the embodiment.
Detailed Description of the Invention [111111] It is converted into a 3-channel signal. The
signals of these three channels are transmitted by transmission systems 3, 4 and 5 to
predetermined points. The transmission systems 3 to 5 are composed of a broadcast line, a
record recording and reproduction system, a recording and reproduction system by a tape
recorder, a wired line and the like. The signals A, B and C transmitted by the transmission
systems 3 to 5 are used when the decoder 6 performs [111111-precoder recording and
reproduction, wired transmission, etc.], and converts 4-channel signals into 3-channel signals.
And a means for converting the 3-channel signal back into a 4-channel signal to enable 3-channel
transmission, in particular, it is suitable for transmitting a stereo acoustic signal and the stereo
acoustic state is substantially the same. It is an object of the present invention to provide a signal
transmission system that can be reproduced by The present invention will be described in detail
below with reference to the drawings. As shown in FIG. 1, microphones fl, fr, fl, and fr are
arranged at four corners in the recording room 1 to collect sound, and signals FL, FR, R, L, and
RR of four channels are obtained. This 4-channel signal is led to the encoder 2, and the 4-channel
signals FL ', RL', FB, ', RR are subjected to [111111] conversion. These four channel signals FL
'and RL'. The FR ', R, R' are arranged at the four corners corresponding to the recording room 10
microphones fl, rl, fr, rr in the reproduction room 7 and added to Cathium 1-bkd, 1111'l, To, rr
'respectively for acoustic Perform 3D playback. In the above method, microphones fl and rl.
When a sound enters EndPage: 1fr-yrr alone, the reproduction state of the reproduction chamber
7 is as shown in FIG. In the figure, ◎ indicates that the signal applied to the speaker with respect
to the microphone acquired signal becomes Odb, ○ indicates that the signal applied to the
speaker with respect to the microphone acquired signal is 10db in phase, and × indicates that
the microphone acquired It is shown that the signal applied to the speaker with respect to the
signal is in reverse phase at 10 db. As described above, on the reproduction side, the channel
transmitting the signal is Odb, and in the adjacent channel, the in-phase relationship is 1 10 db,
and the opposite channel on the diagonal is 1 10 db. Since the diagonal opposite channels are in
reverse phase, sound localization can not be performed on the opposite channels, and the sound
is clearly localized on the signal transmission channel as indicated by the arrows. When the
sound source is at the center of the two microphones in the recording room 1, for example, as
shown in FIG. 3a, when the sound source is localized at the front center, FL =%.
R,L=0. The relationship is as follows: FR =%, RR, = O, and on the reproduction side, as
shown in FIG. 3, the same distribution of sounds as at the time of sound collection is obtained.
Also, as shown in FIG. 4a, when the sound source is localized at the left center, FL =%, RL-%. FR =
0 and RR = 0, and on the reproduction side, [111111] is obtained, and as shown in FIG. Similarly,
when the sound source is localized at the rear center or the right center, the same distribution as
at the time of sound collection can be reproduced. As described above, according to the present
invention, the signal conversion means capable of reproducing the 4-channel signal on the
encoder side in substantially the same state on the decoder side is adopted on the encoder side
and the decoder side, so that the 4-channel signal is obtained. It is possible to provide a signal
transmission system which can be transmitted by a channel transmission system and can
substantially equalize the gross talk relation, level relation and polarity relation between signals
obtained at the decoder side.
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