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JPS5351202

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DESCRIPTION JPS5351202
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of one embodiment of the
reproduction record automatic display device according to the present invention, and FIG. 2 is a
specific circuit diagram of one embodiment of the main part of FIG. 3A to 3D are signal
waveform diagrams for explaining the device of the present invention. 1 · · · Base band signal
input terminal, 2 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Time delay circuit, 6 · · · · · · · · Carrier signal
input terminal, 9 · · · ......
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic
display system for reproduction records, and even if two-channel stereo record reproduction and
multi-channel record reproduction are mixed, the type of record being reproduced is
automatically distinguished. An object of the present invention is to provide an automatic display
device capable of performing the display. In the prior art, it is generally practiced to manually
distinguish and display two-channel record reproduction or multi-channel hL /: l-d reproduction
unit manually with a function switch or the like. The type of the 4 record being reproduced is lit
and displayed when any of the above-mentioned two records is reproduced, and one embodiment
will be described below with reference to the drawings. FIG. 1 is a block diagram of one
embodiment of a reproduction record automatic display (2) system according to the present
invention. In the figure, reference numeral 1 denotes a baseband signal input terminal, which
supplies a band-pass filter 2 with a baseband signal received from a baseband signal
transmission line in the i-multichannel record reproducing apparatus. The O-band filter 2 is
provided to reliably identify the signal and noise when the pickup cartridge is tracing the
recording surface, and the noise when not tracing, several hundred Hi to several It transmits as a
control baseband signal up to kHz, passes through a high gain amplifier 5 which also serves as
an amplitude limiting amplifier, and a rectification circuit 4 and supplies it to a time delay circuit
5 which will later be described which also serves as an integration time constant circuit. The time
delay circuit 5 obtains a control signal (Kototsuru Denda) IIXB delayed by a predetermined time
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from the control baseband signal, and supplies this to the gate circuit 9. On the other hand, 6 is a
carrier signal input terminal, and the carrier signal received from the middle rear signal
(amplitude modulated wave signal) transmission line in the multi-channel record reproducing
device is integrated through the rectification circuit 7 into an integral time constant circuit (3)) It
is added to the time delay circuit 8 which will also be described later. The time delay circuit 8
obtains a control signal (control voltage) Eo obtained by delaying the signal from the rectifier
circuit 7 for a predetermined time, and supplies it to the gate circuit 9 and at the same time
supplies it to the multichannel display 11. The gate circuit 9 supplies its output signal to the twochannel display 10, the control voltage EB is present, and the control voltage EEF. The display 10
is turned on only when there is no. The above gate circuit 9 and the displays 10 and 11
constitute a display circuit 12. FIG. 2 shows a specific circuit of one embodiment of the display
circuit 12. In FIG. 2, the same reference numerals are given to the same parts as FIG. 1, and the
time delay circuit 50 has two output terminals. The output terminal of the time delay circuit 8 is
connected to one of the input terminals 13 of the first time delay circuit 8 via an input terminal
14 to inverters 6 and 17 which are substituted by a NAND gate circuit.
The output terminal of the OR gate circuit 15 is connected to the base of the NPN transistor 20
through a resistor 18. The collector of the transistor 20 is connected to a positive DC power
supply voltage (+ vDo) terminal through a resistor 22 (4), and is grounded through a forward
light emitting diode (hereinafter referred to as IJD) 24. The output terminal of the inverter 7 is
connected to the pace of the -C NPN transistor 21 via a resistor 19. The collector of the transistor
21 is connected to the power supply voltage terminal via a resistor 25 and grounded via LΣ]) 25
in the forward direction. Inverter 7, resistance 19.23. The transistor 21 and the LiD 25 constitute
a multi-channel display 11. In addition, the resistor 1B, 22. 2.) The transistor 20 and the LED 24
constitute the two-channel indicator 10 ifR. In the above configuration (b), when the record is not
reproduced first, the control voltages EB and ICo are set to, for example, zero volts, and at this
time, the transistors 20 and 21 are applied to the base with a positive voltage. Turned on.
Therefore, the anode potential of IJCD24, 25 is almost ground level, so iLOUD24. None of the 25
lights up. (5) Nose Next, the display operation at the time of reproduction of the 2 channel record
will be described. During channel reproduction, a baseband signal is applied to the input terminal
1, but no signal is transmitted to the input terminal 6 because the carrier signal is not
reproduced. From K, the control voltage becomes a positive voltage, and is applied from the input
terminal 13 to the OR gate circuit 15, while the control voltage E is applied to the input terminal
14. Therefore, the output voltage of the inverter 6 is supplied to the other input terminal of the
OR gate circuit 15 as a positive IIH. Here, the OR gate circuit 15 has its output voltage at zero
potential only when the two input terminals respectively have positive voltages at the same time,
otherwise, at least one of the two input terminals is at zero potential. Sometimes the output
voltage is positive, 78E. Therefore, since the 2-input terminal of the eil gate circuit 15 at the time
of 2-channel channel playback is − positive, the output! The king is at zero potential and the
transistor 20 is turned off. As a result, a forward current flows to L]]) 24 through the resistor 22
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and LΣD 24 (6)) emits light. On the other hand, since the output voltage of the 0 o'clock inverter
7 is a positive voltage, the transistor 21 is turned on and the bLFiD 25 does not light.
Therefore, only the LED 24 emits light at the time of 2 channel channel playback, and 2 channels
are displayed. Next, the display operation at the time of multi-channel record reproduction will
be described. In a multi-channel record, multi-channel audio signals are recorded as a baseband
signal and a carrier signal, and these are multiplexed and recorded. Therefore, at the time of
reproduction, the base as shown in FIG. A band signal comes in from the time t1, and a carrier
signal as shown in the same color) arrives at the input terminal 6 from the time t. Therefore, the
control voltages IB and IeC also become positive voltages. Here, the control voltage E of the
carrier signal. Is output from time t2 with an extremely short time delay from the input start time
t by the time delay circuit 8 as shown in FIG. 6 (C), while the control voltage node from the
baseband signal is the same. In the figure (as shown in the poem, by the time delay circuit 5, the
time t is further delayed from the time t2 and a large number of outputs (7)) are performed. The
time interval between the time t and the time t2 is selected from several me to several hundreds
and several hundreds of one, but the relationship of 1, -1, <1, -1 may be maintained. The reason
for selecting such a relationship is to prevent two-channel display from being performed at the
start of multi-channel record reproduction at the start of multi-channel record <slight time (if
there is no time delay circuit 5 or 8, t2- There is a possibility that t,> t, -t, and in this case,
although it is a short time, 2-channel display is performed). Control voltage F shown in FIG. 5 (C).
Is turned to zero potential after time t2 by the inverter 7, and the transistor 21 is turned off.
Thus, ') sLwD2s emits light because a forward current flows through the resistor 23. On the other
hand, since the control voltage EB shown in FIG. 6 ((c)) is set to zero potential after time t3 by the
inverter 6, the output voltage of the OR gate circuit 15 is positive and the transistor 20 is turned
on. Therefore, LP! D24 does not emit light, that is, only LICD 25 emits light during multi-channel
record reproduction, and multi-channel display is performed. In the above example, an IC may be
used as the OR gate circuit 15 and the inverter 6.17, or a combination of a transistor and a diode
may be used. In addition to the OR gate operation, it is used by considering the combination
circuit of the gate circuit and the inverter circuit in consideration of the polarity etc. of the
inverter connected to the gate circuit with the NOR gate, IJ AND gate, main gate with the AND
gate. It is possible.
Further, although an LED is used as a display element in the above embodiment, the present
invention is not limited to this, and it is needless to say that any element may be used as long as
it is a display, a fluorescent display tube, or a liquid crystal display device. is there. As described
above, the reproduction record automatic display device according to the present invention is a
multi-channel record in which at least a multi-channel signal is a baseband signal and a carrier
signal and these are multiplexed and recorded, and a 2-channel signal is a baseband Means for
detecting the carrier signal (9), and a first control signal from an output signal of the carrier
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signal detection means. Means for obtaining the first control signal for obtaining the first control
signal, the first display for supplying the first control signal and displaying multi-channel
reproduction during the supply period, means for detecting the baseband signal, and the
baseband signal The output signal of the detection means is at least delayed from the output
start time point of the first control 111 signal and outputted. Second channel for obtaining a
control signal, and the second channel signal or the first and second control signals supplied
while the second control signal is supplied and the second channel reproduction is displayed. 2
channel display with 2nd channel display only at the time of 2 channel record playback, and
multi channel display only with the 1st display panel at multi channel record playback The above
display can be made automatically by detecting the reproduction signal of the record, so that
even if the mixed use of 2 channel records and multi-channel records is performed, the
reproduction is in progress (10) degrees It has features such as the ability to identify and confirm
the type of the record with eyes and ears.
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