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JPS5224501

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DESCRIPTION JPS5224501
(2000Pi) 'Yu τ' (騨 r · 8 唱 patent application (2) no sign after March 7, 1959, President of the
Patent Office, Sadao Saito, Representative Akio Morita '5, agent cloudy 160' [phase] Japan Patent
Office 0 JP-A-52-245010 published Japanese Patent Application 52. (1977) 2.24. Long-awaited
application 00-8 DI serial number in the office Specification name of the invention 4 channel
stereo record playback device Fig. 1 A-B and F show an example of a field of stereo playback
sound field A plan view and a perspective view, FIG. 2 is a frequency characteristic diagram for
explaining the present invention, and FIG. 3 is a system diagram showing an example of the
present invention.
Brief description of the drawings
Detailed Description of the Invention As shown in FIGS. 1A to 1D, the speakers (1) and (3) are
disposed on the left front and the right front of the listener O1, and the speakers (the speakers
(symmetrically 2) Arrange the (4), and supply the 4-channel stereo signals LP, LBRp, and RB
corresponding to the position of the straw speakers (11 to (4) to form a stereo reproduction
sound field 4 A channel stereo reproduction method is considered. In this case, when the signal
Lp-RB is recorded in the record, the signal LP-RB is multiplexed into frequency spectrum Ω
signals 8A and 8B as shown in FIG. 2N (the horizontal axis is a logarithmic value), for example.
Recorded in a record. That is, assuming that signals corresponding to sounds in symmetrical
positions with respect to the left front and right front of the listener OI and the listener α
[separately Lp, Rp, LB, RB, the signal Lp and pre-emphasis, The pre-emphasis wave number
modulation is performed to form the frequency modulation signal SL. In this case, as an example,
the band of the signal (Lp + LB) is 30 to 15 kHz, and f modulation of the sub-transmission signal
by the signal (Lp-LB) has the same modulation characteristics as multiplexing of the audio
channel in television broadcasting. That is, the modulation signal SL is a signal having a band of
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3'1.5 kHz. +-. 10 kHz with the frequency of 31.5 kHz as a subcarrier frequency. Further, this
signal (LP + LB) and the modulation signal SL are added to form a frequency multiplexed signal
SA. In this case, eight multiplexed signals are recorded with, for example, RIAA characteristics as
shown in FIG. 2B. Be compensated. That is, the R, IAA recording EndPage: 1) compensation
characteristic shown in FIG. 2B has a frequency fl-50H2 (time constant 71 = 3180 μsec), f2 =
500 Hz (τ2 318 μsec), f3 = 2.12 kHz (r3) The compensation characteristic is a compensation
characteristic that rises at a rate of 5 dB 10 ct in a band f, ~f 2 and a band of 13 or more with a
band of f, ~f 2 and a frequency of 13 or more. Further, in the multiplexed signal 8A, the level of
the modulation signal SL is, for example, 29 dB lower than the level at 1 kHz of the addition
signal (Lp + LB) in consideration of the characteristics of the record. The recording-compensated
frequency-multiplexed signal SA is recorded on the side wall for the left channel of the sound
groove of the stereo record in the same manner as a normal 2-channel stereo record according to
the 45-45 system. Signal RF corresponding to the signal Lp, LB at the same time. The RB is also
processed in the same manner to be the signal (LP + LB), the signal corresponding to SL and SA
(Rp + RB), and SR and 8B, which are recorded on the side wall for the right channel of the sound
groove of the record.
The present invention can be reproduced with such 4-channel stereole and smashability, and so
as not to impair stereo feeling and presence during reproduction of 2-channel stereo record, and
2-channel stereo and 4-channel stereo. Therefore, in the present invention, after the multiplexed
signals 8A and 8B reproduced from the record are reproduced and equalized only to the low
band in the present invention, The sum signal (Lp + LB), “'F + RB) and the modulation signals SL,
Sf (and) are separated, and the separated signals (hF + I, B) 1. Perform high-frequency
reproduction equalization on (RF + RB) to obtain signals (LP + LB) and (RF + RB) with flat
frequency characteristics, and also obtain difference signal (LF-LB) (R5p-RB) from modulated
signals SL and SR. To obtain the original signal Lp = RB from the straw signal. That is, in FIG. 3,
051 indicates a speed detection type stereo cartridge, for example, an electromagnetic type
cartridge such as a moving coil type, and the multiplexed signal SA, 8B is obtained from the
record recorded as described above. Each reproduction signal SA is supplied to the low-pass
equalizer circuit (6A). For example, as shown in FIG. 27C, the equalizer circuit (6A) has a
characteristic that the frequency 'Is' 2 is an inflection point, and attenuates toward the high
region at a rate of X5 dB10 Ct in the bands f1 to f2, The RIAA reproduction equivalent
characteristic is provided only at the frequency f2 or less, and therefore, the reproduction
equalization is performed only to the low band (-wave number f2 or less) of the signal SA
supplied to the equalizer circuit (6A). Thus, the signal SA subjected to reproduction equalization
only in the low band is supplied to the filters (7A) and (8A) to separate the signal (LF × LB) and
the modulation signal SL, and the signal from the filter (7A) (Lp + LB) is supplied to the high band
equalizer circuit (9A). In the equalizer circuit (9A), for example, as shown in the second scheme, a
band of frequency 13 or more is attenuated by 6 dB10 ct, that is, frequency 13 or more has RIAA
reproduction equivalent characteristics. Therefore, in the equalizer circuit (9A), reproduction
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equalization is performed in the high band (frequency 13 or more) of the signal (LP + LB), so the
equalizer circuits (9 persons) from the equalizer circuits (6A) and (9A) Is obtained over the entire
band, i.e., a summed signal (LP + LB) having equivalent frequency characteristics is obtained. The
addition signal (Lp + LB) of the flat characteristics is supplied to the matrix circuit (14A).
On the other hand, the modulation signal SL of the filter (eight persons) is supplied to the
demodulation circuit (12A) through the limiter (11A), the subtraction signal (LP-LB) is
demodulated, and this signal (LP-LB) is de-emphasis The signal (LP + LB) and the signal (Lp-LB)
are supplied to the matrix circuit (14A) through the circuit (13A), and the signals (LP + LB) and
(Lp-LB) are matrixed to form the signals Lp and LB. The signals are supplied to the speakers (1)
and (2) arranged as shown in FIGS. 1A to 1D through (2+) and (i). The signal 8B reproduced at
the same time as the signal 8A by the cartridge 05 is also processed in the same manner, and the
circuit corresponding to each circuit described above is given the subscript B instead of the
subscript person of the same numeral. I omit it. The signals RF and RB obtained from the matrix
circuit (14B) are supplied to the speakers (3) and (4) via the amplifiers (3) and (4). Therefore,
according to the playback apparatus of FIG. 3, 4-channel EndPage: 2 stereo record playback can
be performed, but when the normal 2-channel stereo record is played back by this playback
apparatus, the left signal of the 2-channel stereo record Since the left and right signals R
correspond to the single signals (Lp + LB) and (Rp + RB), and the signals SL and SR are equivalent
to the OcD case, the two-channel stereo record can be reproduced as a two-channel stereo.
However, if only a two channel stereo record is reproduced, the signal LSR is supplied from the
equalizer circuits (9A) and (9B) to the matrix circuits (14A) and (14B), so that the signal LSR is
amplified by the amplifier 01 ), (At the same time as supplied to 43, the amplifier (4 thirst, (441
is also supplied, so spill force fl), (2) the left signal is reproduced from the speakers (3), (4) The
right signal B is reproduced, and as a result, the sense of stereo, presence, etc. are reduced.
Therefore, in the present invention, when performing 2-channel stereo reproduction, the stereo
feeling and presence feeling etc. are not impaired and switching between 2-channel stereo and 4channel stereo is surely performed. It is something to try. Therefore, in the present invention, the
signal SL is further added. The presence or absence of SR is detected, and in the case of 2channel stereo reproduction, the detection signal is pressed to block the supply of signals to the
speakers (2) and (4). That is, when the example shown in FIG. 3 is busy, the signal LB.
Between the matrix circuits (14A) and (14B), which are transmission lines of RB, and the
amplifiers (i) and (2), transistors (16A) and (16B) are provided as gate circuits and a filter (8A) ,
(8B) A part of the signals SL, SR is supplied to the rectification circuits (17A, 17B) and rectified,
and the rectified signal is supplied to the NAND circuit 08, and the NAND output is an amplifier.
(Then, they are supplied to the transistors (16A) and (16B) through the switches and the
switches. Therefore, in the case of reproducing four channel stereo records, since the signals SL
and SR are obtained, the output of the NAND circuit α barrel is “O”, and the transistors (16A)
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and (16B) are turned off. Signals LH and RB from the circuits (14A) and (14B) are amplifiers (22,
c! 4), and at this time, the signal LP% 'fLF is also supplied in the loop 7' (21), so that 4-channel
stereo reproduction is performed. On the other hand, when reproducing a 2-channel stereo
record, since the signals SL and SR can not be obtained, if the output of the NAND circuit (181 is
"1", the switch 11 is turned on, the transistor (16A), (16B) turns on and no signal is supplied to
the amplifiers (company) and (2), so the left signal and the right signal R are reproduced only
from the speakers (1) and (3), and the spill force is Do not play from (2) and (4). Therefore,
according to the present invention, 2-channel stereo records can be heard without loss of stereo
feeling, presence feeling and the like. In addition, since the transistors (16A) and (16B) are
turned off when the switch 2 is turned off at the time of 2-channel stereo reproduction, it is
possible to reproduce R from the speakers (2) and (4), which is special You can also get good
results. Thus, according to the present invention, 4-channel stereo records can be heard with 4channel stereo feeling and presence feeling, and 2-channel stereo stereo can be automatically
played without requiring any operation when playing back 2-channel stereo records. You can
listen to it with a sense of presence. Moreover, in this case, the reproduction equalizer circuit of
RIAA is divided into equalizer circuits (6 persons), (6B) and equalizer circuits (9 persons), (9B),
and the signal by the output signals of the equalizer circuits (6A), (6B) Since the presence or
absence of sI and sR is detected, the detection is assured. That is, in the equalizer circuits (6) and
(6B), the method of performing reproduction equalization over the entire band of the signals SA
and 8B is normal reproduction equalization, but in this case, the modulation signal 5L18R is also
attenuated, Is reduced by 23 to 24 dB as compared with the modulation signal 5L1SfL obtained
in the device of the present invention, so that 87N of the rectification signal from the rectification
circuits (17A) and (17B) is degraded by itself. , SR is unreliable, and when playing back a 2channel stereo record, the transistors (16A) and (16B) are turned off and the speakers (2) and (4)
are signaled, R is The transistors (16A) and (16B) become ono when supplying power or
reproducing EndPage: 3 or 4 channel stereo records. (2), Toshiu and then performs signal LB, RB
is not supplied to the (4).
However, in the present invention, since the modulation signals SL and SR are not attenuated by
the regeneration equalization, the level of the rectification signal from the rectification circuits
(17A) and (17B) is large, and the signal S / N is good. , SR detection is assured. Therefore, the
transistors (16A) and (16B) 'can be reliably turned on and off at the time of reproduction of the
two-channel stereo record and the reproduction of the four-channel stereo record, and the
speakers (2), (4) ), And R is not supplied, or the speakers (2) and (4) are not supplied with the −
signal LB1RB at the time of reproduction of the 4-channel stereo record. In addition, since the
modulation signals SL and SR are not attenuated by regeneration equalization, a good signal LpRB of 87N can be obtained, so that it is possible to enjoy a good 4-channel stereo of S / N.
Furthermore, since the modulation signals SL and SR do not attenuate and the gains of the
limiters (IIA) and (IIB) may be small, the limiters (IIA) and (IIB) can be simplified. In addition,
since the reproduction and the like of the equalizer circuits (6 persons) and (6B) can be made
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smaller, the stability of the equalizer circuits (6A) and (6B) can be increased, and the equalizer
circuits (6A) and (6B) Since the output impedance can be easily lowered, the characteristics of
the filters (7A), (8A), (7B) and (8B) can be stabilized. Therefore, the characteristics of the filters
(7A) to (8B) become stable, and the separated signals (LF + LB) and (Rp × RB) are equalized in
high frequency by the equalizer circuits (9A) and (9B), and the high frequency By attenuating, it
is possible to more reliably separate signals (Lp + LB) and SL, and signals (RF + RB) and SR,
thereby achieving 4-channel stereo reproduction with better S / N. In the above, the speakers (]),
(3), (2) and (4) are listeners (in the case of a four-channel stereo arranged at left and right front
positions of 11 and symmetrical positions with respect to the listener OI However, if it is a
playback device of a record in which the signals Lp = RB corresponding to the straw speakers (1)
to (4) are frequency multiplexed and recorded so as to be compatible with a normal 2-channel
stereo signal, The present invention is applicable. That is, for example, as shown in FIG. 1E and
FIG. FC, even in the case where stereo reproduction is performed by arranging speakers (1 to 4)
on the left front, rear, right front and front or When the signals to the speakers (1) to (4) are L1B
and JLJ, LP = 2L + B100.
Rp=2R+B+U、LB=B+U(またはB−U。 The present invention can be applied as
long as the signal LF-RB in which U-B) and RB = BLU (or U-B, B + U) are multiplexed in the same
manner as described above. ,) Opa · Showa 50 patent application No. 31 385 2, title of invention
4 channel stereo record playback device 3, person who makes correction
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