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JPS5010722

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DESCRIPTION JPS5010722
? 44 Channel Reproduction Method ? Japanese Patent Application No. 46-55,680 Application:
A 46 (1971) Published February 12 A: 47-18504 @ A (47) (1972) Sept. 14 0 Izumi Tongue Club
Yokohama City Kana The 12th day of the 13th Picara, Inc. in Moriya-cho, Tokyo 0 applicants
Japan Victor Co., Ltd. Yokohama 12 Yokohama, Moriya-cho 3 The left and right walls of the 4545 groove are obtained by dividing the 4-channel [111111] channel signal into angles by only
adding a simple converter as an adapter to the conventional 2-channel stereo reproduction
device. It is an object of the present invention to provide a reproduction system capable of
reproducing the four channel records mixed and recorded in the above with good sound image
localization of each channel signal. As the coming 4 channel record method, there was a so-called
pseudo 4 channel method such as a method in which the reverse phase sound is generated from
the rear speaker, a method in which reverberation is added to the reverse phase portion, etc. .
The method of phase-modulating the phase difference by 90 ░ also has the same drawback.
Also, the applicant previously proposed a complete four-channel record system in which signals
of two channels each are matrixed respectively, the difference signal is frequency-modulated, and
the sum signal is superimposed and recorded and reproduced. However, this proposed system
has a problem that requires advanced technology and equipment. Therefore, the present
invention provides a reproduction method capable of reproducing a record in which a 4-channel
signal is recorded very easily and with good sound image localization, which will be described
below with reference to the drawings. FIG. 1 shows a longitudinal cross-sectional view of a 45 to
45 type recording dial groove. The modulation directions of the signals ch1 to ch4 of the first to
fourth channels according to the present invention are respectively in the directions of arrows A
to D with respect to the groove 2 of the record soundboard 1, and each has an angle of
45.degree. ing. In the conventional two-channel stereo record, the modulation direction of the left
channel signal is L direction perpendicular to the left wall 3 of the groove 2 and the modulation
direction of the right channel signal is R perpendicular to the right wall 4 of the groove 2 It is a
direction. Therefore, the modulation direction A of the first channel signal ehl and the modulation
direction B of the second channel signal ch2 are in a symmetrical relationship with each other at
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an angle of 22.5 ░ with respect to the L direction. The modulation direction C of the third
channel signal ch3 and the modulation direction of the fourth channel signal ch4 are in a
symmetrical relationship with each other at an angle of 22.5 ░ with respect to the R direction. In
other words, the modulation direction A-D is [111111] EndPage: 1 with an angle of 22.5 ░ from
the horizontal and vertical directions of the record disc 1, respectively.
Here, when the first to fourth channel signals chi-ch4 are individually modulated in the positive
direction, the grooves 2 of the record sound board 1 are modulated in the respective directions A
to D as shown in FIG. 2A to D. . FIG. 3 shows a circuit diagram of a converter for converting each
signal of 4 channels in the recording system into left and right signals. This converter is
connected to a conventional two-channel record cutting and recording apparatus, and the first to
fourth channel stripes chi-ch 4 applied to the input terminals 5 to 8 respectively are angularly
divided into angles [111111]. The L direction components (cos'chi1-CO5ich2) sinNch3 and -5
inch 4 of the divided signals ch1 to ch4 are respectively supplied to the mixer 130 input
terminals 13a to 13d. Signal chi-14a-14d bei supply false. : The L direction components of the
signals Ch1 to Ch4 are taken out from the terminal 15 mixed by the mixer 13 as the left channel
signal t. The R direction components of the signals chi to ch 4 are mixed in the mixer 14 and
taken out from the terminal 16 as the right channel signal ?. This left and right channel signal
C1? is a two channel stereo cutter conventionally used by the above left and right channel
signal C2? obtained from the terminal 15.16 of the converter in the following equation% (1) (2)
respectively. Drive and cut and record in the groove 2 of the 45-45 system. Thereby, the signal t
including the components of the signals chi to ch4 on the left and right walls 3.degree. Of the
groove 2, respectively. Each ? is recorded. Accordingly, the groove 2 is a modulation groove
having four directional axes as shown in FIGS. 1 and 2A-D. For example, when only the first
channel signal chi is recorded, the left channel signal C from the terminal 15 is recorded, and the
synthesized modulation direction becomes the direction A of the chi signal shown in FIG. For
example, when the first channel signal chi and the second channel signal ch2 are the same signal
and in phase, a modulation groove in which the signals chi and ch2 are combined is formed in
the L direction, and in the R direction 7, the signals c11 and c4 are also Because of the L, the
grooves are modulated and fully compatible with six conventional two channel stereo records.
Next, the case of reproducing a record having modulation grooves cut and recorded as described
above will be described. FIG. 4 shows a circuit diagram of a reproduction system including a
converter for converting left and right signals C2? into four channel signals ch1 to ch4. The
converter is connected to a conventional two-channel stereo reproduction apparatus, and the left
and right channel signals t and ? reproduced by the groove 2 of the record disc 1 are supplied
to the input terminals 17.18 through pickups.
The left channel signal C is connected to the input terminals 23a and 24a of the resistors R1tR
223 and 24, respectively, and the terminal 20 to the input terminals 25a and 26a of the mixer
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25.26. The signals (?? ? are supplied to the mixers 25 and 26, respectively). Similarly, the
right channel signal ? is taken out to the terminals 21 and 22, respectively, as a signal under ?
i ss 7 ", under the signal. Further, since the terminal 21 is connected to the input terminals 23b
and 24b of the mixer 23.24 and the terminal 22 is connected to the input terminals 25b and 26b
of the mixers 25 and 26, respectively, the signal (e) is transmitted to the mixer 23.24. Each signal
is supplied, and the signals (1? and 7 are mixed with mixers 25 and 26). Be taken out. Similarly,
in the mixers 25 and 26, the signals (.tau..fwdarw.7.rho. And the signals (sum and difference of
the signals are mixed, and the sum signals ? ? ? 1 ? 6) Wa-jaaaaMEndPage: 2 ? ? ? It is
taken out by the terminal 30. Substituting the above equations 1) and (2) into the sum and
difference signals as described above taken out from the terminals 27 to 30, respectively, the
code h "2c" + 2V'Nch2-2ch4. ... (4) d = 2 chi + 24 ch 3 + 2 ch 4 ... (5) ?, 11-; page T "2 Ch 2 + 2
ch 3 + 2 near. h4... (6) Therefore, as apparent from the equation (3), the signal [111111] from
the terminal 27 can not be obtained at all. Similarly, among the signals extracted from the
terminal 28, the second channel signal ch2 is 1 while the first and fourth channel signals chi and
ch4 both have a small bell and the third channel signal ch3 is completely I can not get it. Among
the signals taken out from the terminal 29, the signal ch3 of the third channel is 1 and the
signals chi of the first and fourth channels and the channel ch4 of the fourth channel are small
by 7 ?, and the signal ch2 of the second channel is not obtained at all. Among the signals taken
out to the terminal 30, the signal ch4 of the fourth channel is 1 with respect to the signal ch2 of
the second and third channels ch2. The channel ch3 has a level as small as -fz'v'.SIGMA., and the
signal chi of the first channel can not be obtained at all. Of the signals extracted from the
terminals 28 and 30, the fourth channel [111111]! The second channel signal ch2 and the
second channel signal ch2 have negative values, as can be understood from FIG. 1 in that the
four channel signals are respectively adjusted to the phase of the modulation direction of the
conventional two channel stereo record. This is because the components are in the direction
opposite to the L direction and the R direction.
FIG. 5 is a circuit diagram of one embodiment of the converter circuit shown in FIG. The terminal
31.32 corresponds to the terminal 17.18 of FIG. 4, to which the left and right signals C2?
reproduced from the record note are applied. T.gamma.1 DEG T.gamma.2 is a transistor for
converting the signal C2.gamma. Into a channel signal in the above-mentioned manner,
33.about.36 is a transistor for measuring the frequency of 2 r-30 in the figure, R5 is the collector
and terminal of the transistor T.gamma.1. 36. A resistor connected between 36 and R6-R8 is a
resistor connected between the emitter of transistor T.gamma. And terminals 33 to 35. R9 is a
resistor connected between the collector of transistor T.gamma.2 and terminal 34. , RIO-R12 are
resistors connected between the emitter of the transistor T?3 and the terminals 33, 35, 36. FIG.
6 shows an arrangement example of a 4-channel signal reproduction speaker. Reference
numerals 37 to 40 respectively denote speakers for reproducing the first to fourth channels,
which are respectively disposed at front left, rear left, front right, and rear right with respect to
the listening position of the listener 41. Here, in the conventional two-channel stereo playback
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apparatus to which the converter shown in FIG. 4 is attached, the record tfiki 4- ? ? 1 ░ first
channel signal chi of the above-mentioned recording mode is one from the speakers 3 and 38.39
respectively: 1, Played at a percentage rate, right rear speaker No. 40 does not sound, and the
sound image of the signal chi is localized to the left front. Similarly, the signal ch2 of the second
channel is reproduced and pronounced from the speakers 37, 3B and 40 respectively at a ratio of
1: 1 ? 1 ? ?, the speaker 39 on the front right is not sounded, and the sound image of the
signal ch 2 is on the left rear It is localized. The left rear speaker 38 does not sound, and the
sound image of the signal ch3 is localized to the right front. Further, the signal ch4 of the fourth
channel is reproduced and reproduced at a ratio of 1: 1, -?, ma ": 1 from the speaker 3B, 39.40,
the speaker 37 on the left front is not reproduced and reproduced, j of the signal ch4 The sound
image is localized to the right rear. Therefore, for the listener 41, the first to A-th [111111]
EndPage: 3 channel signals chi to ch 4 are heard as being respectively exclusively generated
from the speakers 37 to 40, and sound source localization is determined. Next, when the
converter of FIG. 4 (FIG. 5) is attached to the conventional two-channel stereo reproducing
apparatus and the conventional two-channel record is reproduced, the left and right recording
signals of the record are obtained. There is a more realistic sound. In addition, more efficient 4channel record recording can be performed by performing mixing while monitoring the
reproduced sound field of 4-channel L / code using the above-mentioned converter at the time of
studio recording.
As described above, according to the 4-channel digital recorder reproduction system according to
the present invention, a 4-channel channel record can be recorded using only a simple converter
attached as an adapter to a conventional 2-channel stereo reproduction apparatus. It has the
features of being able to reproduce with a good localization and listening to a realistic
reproduced sound, and also capable of listening in a pseudo 4-channel mode even when
reproducing a 2-channel record [111111].
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view showing modulation directions of four
channel signals with respect to a 45-45 system groove of a record sound board to be reproduced
by the reproduction method of the present invention, and FIG. 2 (5) to FIG. FIG. 3 is a diagram
showing the modulation direction of the groove of the record sound board with respect to the
signal, FIG. 3 is a circuit diagram of the main part of one embodiment of the recording system of
the record sound board, and FIG. 4 is one embodiment of the reproduction method according to
the present invention. FIG. 5 is a circuit diagram of the main part, FIG. 5 is a circuit diagram of
one embodiment of the specific electric circuit, and FIG. 6 is a diagram showing one example of a
reproduction speaker arrangement of four channel signals. 1 ...... record Onban, 2 ...... sound
groove, arrow A-D ......... first to fourth channel signal modulation direction, 5-8 ...... First to fourth
channel recording signal input terminals L9 to 12 и и и и и Angle divider, 13, 14 и и и и и и и и и и и и и и и и и и
и и и и и и и recording signal output terminal, 17.18 иииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии
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Speakers for channel 1 to 4 for channel reproduction, 41... ????????????????
?
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