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JPS5096402

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DESCRIPTION JPS5096402
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory view showing the relationship
between a record tone groove and a multiplexed signal, FIG. 2 is a block diagram of a seri circuit
according to one embodiment of the present invention, and FIGS. It is a frequency response
characteristic figure of each part of a channel signal system circuit. In the figure, 1 is a record
board, 2 is a sound groove, A is a main channel signal system circuit, B is a sub channel signal
system circuit, 3 is a RIAA equalizer circuit, 4 is a separation adjustment device, 5 is a low bus
filter circuit, 6 The first band pass filter circuit 7 is an FM detection circuit, 8 is a changeover
switch, 9 is a matrix circuit, 10 is an automatic gain control circuit, 11 is a second band pass
filter circuit, 12 is a detection circuit, 13 is an oscillator, 14 Is a display. Fig. 1-3 Japanese Utility
Model Application Publication No. 50-96402 (2) Fig. 4;
DETAILED DESCRIPTION OF THE INVENTION (1) One This invention uses a pair of multiplexed
signals formed by frequency multiplexing signals of multiple channels in place of L-R signals in
the 45-45 system. The present invention relates to a switching display circuit in a multi-channel
record reproducing device recorded in a groove. A signal corresponding to the L signal in the
normal 45-45 system is a pair of multiplexed signals obtained by frequency multiplexing the sum
signal (LF + LB) and the difference signal (LF-LB), and a signal corresponding to the t7ThR signal
Are another pair of multiplexed signals obtained by frequency multiplexing the sum signal (RF +
RB) and the difference signal (RF-RB). Hereinafter, the above-mentioned sum signal (LF + LB) and
(RF + RB) will be referred to as the main channel signal, and the difference signal (LF-LB) and (RFRB) will be the carrier wave f by the modulation wave. By angularly modulating, the main channel
signal is referred to as a subchannel signal that is shifted in its occupied frequency band. In FIG.
1, the main channel signal (LF + LB), (RF + RB) and the angle-changed sub-channel signal (LF-LB),
(RF-RB) consist of (2) multiple pairs of multiplexes The multiplexed signal is recorded directly on
the record board (1) like the L-R signal in the 6-45-45 system of each pair of multiplexed signals,
but the subchannel in each pair of multiplexed tripled signals Signal (LF-LB), (!. (RF-RB) has a
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level significantly lower than that of the main channel signal (LF × LB) and (RF + RB) as is
apparent from the frequency response characteristic diagram of the tai diagram. In the 4-channel
record playback apparatus, it is necessary to have a sufficiently large amplification for the subchannel signal. The subchannel signals (LF-LB) and (Ry-RB) are distributed in the range of +15
KHz and -10 KHz by angularly modulating the carrier wave (fo) of 50 KHz with the modulation
wave, and the sub-channel signal is occupied Since the lower end portion of the band is arranged
to be close to the upper end portion of the occupied band of the main channel signal, in order to
extract the subchannel signal from each pair of multiplexed signals reproduced with a pick-up
force of 1 It requires a circuit with (3) ○ ○ which has steep band-pass filtering characteristics of
the cutting characteristics. Generally known as a circuit arrangement capable of satisfying the
above requirements, the main channel signal system comprises an RIAA equalizer circuit, a low
pass filter circuit and a separation adjustment device etc., and the sub channel signal system is a
flat amplifier circuit. A band pass filter circuit, a limiter circuit, an FM detection circuit, etc. are
formed, and the signals from both systems are switched by the signal processing system to be
added and subtracted by the matrix circuit to obtain each channel signal.
However, the crosstalk signal generated at the upper end of the main channel signal can not be
removed sufficiently by the characteristics of the band pass filter, and when modulated, the main
and Yazoya signals 7, and the secondary and Yaooya signals jll, j ": <A = d: Kne yo, yeah, イ ・ ・
・ ・ There was a risk of hair being produced. The present invention therefore seeks to provide a
switching display circuit which does not have the above drawbacks. An embodiment of the
present invention will be described below with reference to the drawings. In FIG. 2, (4) is a main
channel signal system configured by connecting a low pass filter circuit (5) to the RIAA equalizer
circuit (3) through (4) O separation adjustment device (4), (B Is an auxiliary channel signal
system, an FM detection circuit (7) is connected to one of the outputs of the first band pass filter
circuit (6), and the output thereof is switched via the switch (8) to the main channel signal
system (5) Together with the output of the matrix, k) connected to the circuit (9)%, and another
automatic gain control amplifier (G) connected to the output side of the second band pass filter
α, The output is connected to the oscillator (2) through the detection circuit (6), and the output
signal of the oscillator (2) is applied to the display α ♦ and the changeover switch (8). □ Now,
when the cartridge (not shown) is absolutely required to receive an electric signal, in the main
channel signal system (8), the frequency characteristic is made flat by the electric signal idRIAA
equalizer circuit (3), and the separation adjustment device (4 ) Adjust the level of the main
channel signal and fix it at the separation best phase, the FM modulation wave is removed by the
next low pass filter circuit (5), and only the main channel signal (LF + LB) or (RE + RB) (5)-It is led
as a main channel signal output to a trix circuit (9). In the secondary channel signal system (B),
the FM modulation wave from the cartridge is taken out by the first band pass filter circuit (6),
and in the next FM detection circuit (7), the secondary channel signal of the sound from the FM
modulation wave ( Ly-LB) i (RF-RB) is obtained and led to the matrix circuit (9) through the
changeover switch (8), and in the circuit (9), the above main channel signal (LF + LB) or fRE. , Are
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subtracted to obtain signals LF, 馳 or RE, RB of the terminals (9a), (98) of the respective channels.
On the other hand, the first band pass filter circuit (6) is an automatic gain control amplifier (sub
channel signal (LF-LB) or (RE-RB) leading to 113 or main channel signal (LF + LB) or (RF-Rs) ) Is
held at a predetermined level in the amplifier (d) to remove and detect high band signals of the
main channel signal (LF + LB) or (RE + RB) with the second band pass filter circuit α power. In
the circuit (6), the subchannel (6) signal (LF-LB) or (RE-RB) is detected and led to the oscillator
(2), and the output signal of the oscillator (1) The changeover switch (8) is operated to close the
switch (8), and when the indicator 4 is a lamp, it will be turned on.
Also, when the electrical signal from the cartridge is a 2-channel signal, the sub-channel signal
(LF-LB) or (RF-RB), ie, the FeM signal does not enter, so there is no output signal from the
oscillator 1 (2) The switch (8) and the indicator a are not activated, and the secondary channel
signal line circuit (B) is opened to prevent noise mixing. The frequency response characteristics
at each portion of the subchannel signal system circuit (B) are as shown in ta6 to ta6. That is, the
characteristic I'i of the output side of the first band pass filter circuit (6) is shown in FIG. 6, and
the characteristic of the output side of the automatic gain control amplifier (d) is shown in FIG. In
the case of 4-channel record, (b) is (a), and (a) in the figure is the AGC level. The characteristic of
the second band pass filter circuit (111 is shown in FIG. 5, the characteristic on the output side of
the circuit (ii) is shown in fa6 (7) □ or 0, and in the case of two channel records (ii), In the case
of 4-channel record, (b) in the figure <4) is the detection circuit level. As described above,
according to the present invention, an automatic gain control amplifier is connected to a circuit
for detecting the presence or absence of a specific signal of the subchannel circuit, and automatic
gain control is performed around the frequency of the specific signal. Is taken out through a filter
circuit which passes a specific frequency, and the presence or absence of this output signal
makes it possible to open / close the sub-channel circuit and to indicate the presence / absence
of a signal, thus simplifying the configuration of the filter circuit and malfunctioning. Otherwise,
when there is no signal input, the sub-channel signal system circuit is reliably opened, and it is
possible to completely prevent the disturbance and oscillation of the output signal waveform due
to the mixing of noise.
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