JPS49129501

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DESCRIPTION JPS49129501
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of an example of a
conventional 4-channel disk reproducing circuit, and FIG. 2 is a block diagram of an embodiment
of a 4-channel disk reproducing circuit according to the present invention. 1 ··· 4 channel record
disc 2 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · 4a ˜ 4d, 9 · · · · · · ·
output terminal, 5a ˜ 5b · · · ----- low frequency amplifier, 6 ... ... switching Suitsu f, 7a-7b ······
Subika, 8 ...... Deco ¦ switching 1 circuit. Fig. 1-1-49-129 501 (2) Fig. 1-1. 2 1
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a reference
channel disk reproducing circuit, and. -1 'knee' j, 4 islands 8 □-, cover-. (1) It is an object of the
present invention to provide a spring channel disk reproducing circuit which automatically
switches and selects a reproducing circuit corresponding to each recording system when
reproducing a matrix system. In general, discrete multi-channel disc l0D-41 (alpha channel
record) and! The means of playback with an F-Rithuss multi-channel disc (e.g. Regi =-La matrixchannel record) is basically KJ% quality, and the user manually switches the circuit of the
playback device according to the recording system of the record to be played. 1) It was
troublesome to operate. FIG. 1181 shows seven examples of block diagrams of conventional
discrete type and matrix type provided channel disc reproducing apparatus. First, the case of
reproducing a discrete system q channel disc I in which a channel number signal is recorded by
using a multiplexed signal of a direct wave signal and an angular quality w11 wave signal will be
described. It is a seed operation in which the contact piece is connected to the fixed contact a
side. The signals picked up by the record / read-up disc are then applied to a discrete multichannel disc demodulator J (hereinafter referred to as a demodulator to a storm), where it is
separated into each J channel signal. The demodulator J is an equalizer that equalizes the direct
wave sum signal according to the R-A characteristic, a demodulation circuit that demodulates the
angle modulation wave difference signal, an arithmetic circuit that obtains each channel signal by
adding and subtracting the sum signal and the difference signal, an angle modulation wave It is
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composed of a muting circuit or the like which narrows the presence or absence of a signal and
cuts off a part of the difference signal transmission path. Each channel signal th1mal 21ass, ak @
taken out to each output terminal ga, gi, gc, gd of the demodulator J respectively passes through
a low Fil wave amplifier "+ Ib * jII, 5d, and then each front left (-? Loudspeakers 7 arranged at the
right) are sounded from the front right (the speaker 76 of RFI, the rear speaker 7g at the left rear
(LB), and the rear speaker 7d at the right rear (RB). On the other hand, when the record disc
recorded in the matrix system is reproduced, the changeover switch 4 (71 is switched to connect
each movable contact piece to the fixed contact side). Since there is no angle modulation wave
signal in the reproduction signal of the matrix type multi-channel record F disc, the output
terminal ga of the demodulator J.
The direct wave signal inscribed on the inner wall of the sound groove of the disc l is taken out to
ge, and the other output terminal gh. The direct wave signal R inscribed on the outer wall of the
sound groove is taken out to ad. Here, since the changeover switch 切換 え is switched as
described above, the direct wave signal from the output terminal μα of the demodulator J is a
low frequency booster circuit n and a matrix type multi-channel disc decoder 1 (hereinafter
referred to as a decoder). The connection signal R is supplied to an @ frequency amplification
circuit sb and a decoder t, which are supplied to an output terminal gh. The direct wave signal R
supplied to the decoder r is now mixed or offset with the appropriate specific gravity and then
supplied to the low frequency amplification circuits ja and sd respectively. In the above
embodiment, the channel signals from the amplifiers 3a and zd are produced by the speakers 7a
to d arranged at the four corners respectively. (Buddha) As described above, according to the
conventional multi-channel disc reproducing apparatus For example, it is necessary to provide a
change-over switch and manually switch according to the recording system of the recording disc
to be reproduced. In particular, using an autochanger etc., a plurality of multichannel discs of
different recording systems are successively and successively There was a drawback that was a
major obstacle when playing. The present invention overcomes the above-mentioned drawbacks,
and an embodiment thereof will be described below with reference to the drawings. FIG. 1 shows
a block diagram of an embodiment of a reference channel reproduction circuit according to the
present invention. In the figure, the same reference numerals are given to the same components
as the components given in FIG. 1, and the description thereof is omitted. Reference numeral 9 is
a detection terminal of a demodulator J, which is taken out as a main kneeing control signal
obtained by detecting an angle modulation wave component (carrier component) contained in
the reproduction signal of the discrete type channel disk. io is a drive circuit, which is operated
by the control signal, and the switching circuit // a, // & is automatically switched by the output
from this. The switching circuit // a and // & each output terminal ga (! Between the amplifier
IC1 and the terminal d and the amplifier jd, and the output terminal of the inverter 1 is
connected. If there is no output signal from the switch circuit 17α company drive circuit 10,
connect between the decoder t and the low frequency amplifier SC, and connect between the
demodulator J and the amplifier je by the output signal from the drive circuit mlO. The switching
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operation is performed. The switching circuit // b switches as well as the switching circuit / la.
The case where the discrete system record disc l is reproduced in the above-mentioned
constituent device will be described.
At the same time, the signal picked up by the pickup cartridge λ from the record disc 1 is
separated into each channel signal by the demodulator J and output to each output terminal α to
da b. Further, at this time, the above-mentioned control signal obtained by using an angle
modulation wave commonly is outputted to the output terminal 9, and the drive circuit IO is set
as the operation mode. Further, the switching circuit // eL, / C are respectively switched and
supplied with the output signal from the drive circuit io, and the (≦) k 0 output terminal ° · ′
′ ′ ′ t ′ of the demodulator J 1 ° and 1 Connected to For this reason, the nine channel
signals taken from the output terminals No. o to atd are supplied to the corresponding amplifiers
ja to Id, respectively, and sounded from the speakers 7G to 7d disposed in four directions to
generate a three-dimensional sound field. It is formed. Next, the case where the matrix type
record disc l is reproduced in the above-mentioned constituent device will be described. Since
there is no angle modulation wave signal in the reproduction signal of the matrix type record
disc l, a direct wave signal 'L recorded on the inner wall of the sound groove is taken out to the
output terminals 41a and g6 of the demodulator J and the output terminal A signal R recorded
on the outer wall of the sound groove is taken out to gh and gd. At this time, since no signal is
output to the output terminal 9, the drive circuit IO is in the non-operation mode, and the
switching network // aA // b is also in the non-switching operation mode. For this reason, the
low local oscillators jc and jd are connected to the decoder II / Cm via the switching circuits jO
and 5d, respectively. Accordingly, the output ladders μa and gh are supplied to the speakers 76
and 76 via the (7) power amplifier 1a and 1h to be produced by the respective speakers ya and
lb, and the two output signals of the mata decoder t are respectively Switching circuit // a, // h,
amplifier 1g! The signal is supplied to the speakers a, 7 d through d, and sounded from the
respective speakers to, yd. In the case of reproducing a normal stereo record disc in the above
reproduction apparatus, since there is no angle modulation wave signal in the reproduction
signal from the cartridge as in the case of reproducing a matrix type record disc, they are
disposed on the rear left and rear right The reproduction signals are supplied to the speakers 7C
and 7d which are speakers via the decoder l. For this reason, pseudo-multichannel playback
effects can be obtained in the playback of many ordinary stereo records, and there is no problem.
As described above, according to the No. channel disc reproduction circuit of the present
invention, the reproduction circuit is automatically determined according to the discrete type
channel disc and matrix type g channel disc by determining the presence or absence of the angle
modulation signal in the reproduction signal. Since switching (f) is possible, the operator does not
need to switch and connect the playback circuit by switching means such as a switch every time
the multi-channel record of different recording systems is played, especially recording using an
autochanger. It has advantages such as being effective when applied to a continuous playing
device of a plurality of multi-channel red disks different in system.
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Brief description of the Buddhist temple side Fig. 1 shows a block diagram of seven examples of
the conventional channel disc regeneration circuit, and an IIJ diagram of the channel disc
reproduction circuit according to the present invention! It is a Plutz systematic diagram of an
example. l ··· events channel record disc, 2-, pickup card ridge, J ··· di modulator, 4 + a, gd ,? --Output terminal, ja-, jh --- Low frequency amplifier, ......-Switch, 711-7 &-Speaker, l-Decoder, IODrive circuit, // 11. /// b ... switching circuit. Utility model registration achievement entry Japan
Bitter Co., Ltd., agent patent attorney Tadahiko Ito (9) (Hs> lj '□; □ 13 ′ ′ ′ L4b Rbt resistant
[ML. 4 d insect crest ˜ b · ,. Fig. 2 (, 4a 2 L 9 b 4, l lok 知 76 b 9 0 ·, 95 Q 1 · 1 · · · :: bituminous
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