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JPS4955003

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complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JPS4955003
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a circuit diagram showing an embodiment of
the present invention. L · · · · · · display lamp, F · · · · · · FM tuner, switch linking the S1, S2 · · · · · ·
stereo mono selector switch, and S3 · · · · · · input switch Switch for interlocking, T ······· Transistor
for switching. −5−
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an operation
display device of a stereo reproduction apparatus. The stereo reproduction device is provided
with a stereo monaural (1) switch so that the circuit can be switched to suit them. Then, in order
to display on the switching state, a display lamp interlocked therewith is turned on. Also, at the
time of reception of the FM radio, there is provided another display lamp which detects that the
signal is "stereo" or "mono" or "t" and lights up in the case of "stereo". By the way, when the FM
radio ○ reception signal is monaural , if the stereo / monaural switch is switched to
stereo side, one of the two display lamps linked to the selector switch is stereo . Is
displayed, so that the FM reception signal may be mistaken as stereo . Also, conversely, even
if the FM reception signal is "stereo", if the stereo / monaural switch is switched to "mono" side,
one of the two display lamps is "stereo" ヲ, The other displays "mono" and confusion occurs. (2)The object J ', + The present invention aims to eliminate the above-mentioned drawbacks, which
will be described below by the illustrated embodiment. F is an FM tuner, A is an AM tuner, and
they are supplied with power from the power supply B via the contact 1.2 of the changeover
switch S linked to the input changeover switch, and are selectively activated . It is provided at the
switching position when the contact point 5.4Fi input is a record player and an external input
such as a tape recorder, and they are grounded via a resistor R and a resistor. L is a display run
for displaying F stereo. And is inserted in the collector circuit of the transistor T whose emitter is
grounded. The base of the transistor T is connected to the movable contact of the changeover
switch Sl. The changeover switch S1 is interlocked with the changeover switch S and the stereo /
monaural changeover switch. The FM tuner F includes a detection circuit for a stereo pilot signal,
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and its rectification ratio (3) 1) and J-car are supplied to the "stereo" side contact of the
changeover switch S. The "stereo" side contact of the changeover switch S2 is connected to the
contact 5.4 of the changeover switch S3, and its movable contact is connected to the base of the
transistor T via the resistor R0. When the stereo-monaural changeover switch is switched to the
"monaural" side, the changeover switch S1 ° S2 is also switched to that side, and no voltage is
applied to the base of the transistor T, so the transistor T is turned off and the display ripple L
Does not light.
Therefore, "monaural" is displayed regardless of the position of the changeover switch S
interlocked with the input changeover switch / f-touch or at any position. When the stereomonaural changeover switch is switched to the "stereo" side and the changeover switch S3
interlocked with the input changeover switch is switched to the contact 1, that is, "FMJK is
switched, the FM tuner F operates and the received signal If it is a "stereo" then it contains a
stereo pilot signal, its rectified output is switched via (4) 1 "), 3 'one switch"-switch S, the base of
the transistor T Supplied to As a result, the transistor T is turned on, and the display lamp L is
turned on to display "stereo". Also, when the received signal is "monaural", there is no voltage
applied to the base of the transistor T because the stereo pilot signal is not included, and the
transistor T is turned off. Since the voltage is not supplied from anywhere to the base of the
transistor T when the changeover switch s for displaying "monaural" is displayed, 2 contacts 2,
that is, when switched to [AMJ, the display lamp L does not light, and always "mono Is displayed.
When switching to the switch ssi contact, 5 or 4, the voltage from the power source B is supplied
to the transistor Tcv4 through the contact 3 or 4 and the switch S11 resistance & vi, and the
transistor T is turned on. Since the lamp is turned on, the indicator lamp L lights up. "Stere 1 (5)!
Display "Shio". Even in this case, when the changeover switch S + is switched to the monaural
side, the circuit is cut off at that portion, so that the supply of voltage to the base of the transistor
T is cut off and the display lamp L is not turned on, monaural Display As described above,
the present invention lights up one display lamp based on the stereo pilot signal included in the
FM stereo signal, and can display the FM stereo in the same manner as the conventional one.
Since the indicator light is turned on also in the switching state other than the radio reception
state, and it is interlocked with the stereo / monaural switch so as not to be turned on in the
"mono" state, the circuit It can also be displayed that it is in the state. In this way, when it is
displayed whether the circuit is "stereo" or "monaural" by one display lamp, it is also used as a
lamp to indicate whether the FM reception signal is "stereo" or "mono". There is no risk of (6)-)
misidentification or confusion as in the case of providing two indicator lamps. In the above
embodiment, the transistor T is used as a switching element to open and close the circuit of the
display lamp L. However, the detection output of the stereo pilot signal is directly applied to the
display lamp L and lit by the output. It is also good.
Further, although the changeover switches S and St interlocked with the stereo monaural
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changeover switch are inserted in the pace circuit, they may be inserted in series in the display
rung L.
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