JPS5043701

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DESCRIPTION JPS5043701
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a circuit diagram of an embodiment of an
automatic switching circuit according to the present invention. 1, 2 · · · · · · · · · Ham input
terminals, 3 · · · · · · · · · · · · · · Phase modulated signal input terminals, 4 · · · · · · · · · · · · · · · · · · · · · · · ·
· · · · · · · · · · · · · · · · · 4. ... Reproduction signal input terminal of discrete 4 channel record, 6. ....
Control circuit. −1−
[Detailed Description of the Invention] (1) The present invention relates to an automatic
switching circuit of a stereo reproduction apparatus, discrete 4 channels (so-called CD-4) L /: I-) ',
MA) IJ socks channel record, 2 channel record It is an object of the present invention to provide
an automatic switching time wI which can automatically switch a reproduction signal
transmission system from the like. As well known, there are discrete 4 channel records, matrix 4
channel records, 2 channel records, etc. in the records, so when playing back the signals
displayed on these records, 1i 11 degrees Switching operation of the circuit must be performed.
The present invention eliminates such a drawback, and one embodiment will be described with
reference to the drawings. 1 and 2 are ham detection terminals, 3 is an input terminal for
rectifying and applying a phase modulation signal reproduced from discrete 4 channel records, 4
is a reproduction signal input terminal from matrix 4 channel records or 2 channel records, 5 is
discrete 4 It is a reproduction signal input terminal of channel record. (2)-\) Now, when the
terminal 1 or 2 is touched, a hum of the commercial power supply frequency is introduced and
added to the gate of a field effect transistor (hereinafter referred to as FET) Q or a gate. The
signal detected and amplified by the FBTQ or Q2 is further added to the transistor Q which
constitutes the discrimination circuit 8 or #! Q40 will be supplied at pace. This discriminator
circuit 8 is mainly configured such that only one of the transistors is turned off 9 in accordance
with the terminal to which the input signal is applied, and the output from the transistor in the
off state is main. For example, when an amplified hum is applied to the base of the transistor Q,
the transistor Q, Fi turns off. Therefore, since the base light flows from the collector of the
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transistor Q to the transistor Q4 through the resistor R, t-, the transistor Q4 is turned on.
Conversely, when the transistor Q4 is turned off, the base current flows into the transistor Q
through the resistor R4, so the transistor Q1 is turned on. Therefore, when touching the child
11C, the transistor Q. The output voltage is obtained from the collector of the transistor Q2 and
when the terminal 2 is touched, the force voltage from the collector of the transistor Q4 is
obtained. When an output is generated from the transistor Q, its output signal is added to the
switching circuit 7m by the diode D + t, so that the matrix 4 channel reproduction signal or 2
channel reproduction signal applied to the terminal 4 is the output terminal 6 Appear on
On the other hand, the output signal of transistor Q4 appears at point A. Therefore, the present
invention is characterized in that the threshold of point A and point B is not directly connected as
shown by the dotted line, but the control circuit 9 is inserted between them. As described above,
when the transistor Q4 is in the off state, the operating voltage is supplied to the transistors Qs
and Q6 constituting the control circuit 9 through the resistor R1 and the bird, respectively. In
this state, when the phase modulation signal reproduced from the discrete 4 channel record is
input to the terminal 3, the transistor Q5 + (O /, the transistor Q6 is turned off. Therefore, a
voltage is applied to the switching circuit 7b through the diode D3, so that the signal applied to
the input terminal 5 appears at the output terminal 6. On the other hand, when the phase
modulation signal is not applied to the terminal 3 (4), that is, the matrix 4 channel record or the
112 channel record, the transistor kQ turns off and the transistor Q4 turns on. Therefore, voltage
is applied to the switching circuit 7a through the diode D2t-), and the number 11 applied to the
input terminal 4 appears at the output terminal 6. Therefore, as described above, the
reproduction signal from the matrix 4 channel record or the normal 2 channel record is added to
the terminal 4 and the signal d from the discriminator 14 channel record is displayed on the
terminal 5 as shown in FIG. (But if terminal 2 (when touched, discrete 4 channel record 二 2 is
used, 7 h raw signals are output terminal 6 hc%, and matrix 4 channel record or 2 channel record
is spread) The reproduction signal is switched automatically, and is celebrated at the output
terminal 6. As described above, the self-control switching circuit according to the present
invention is a circuit for detecting the hum introduced when the four children are touched by
hand, the operation voltage gold supplied when the hum is detected, and the record The control
signal is supplied to the second switching circuit when the phase modulation signal of z KI is
detected in the discrete 4 channel (5) channel signal, and the control signal is supplied to the first
switching circuit when the phase modulation signal is not detected. The second switching circuit
is supplied with a reproduction signal of the discrete 4 channel record, or l! By applying the
reproduction signal from the matrix 4 channel record or 2 channel record to the 1 switching
circuit, it is possible to automatically select the signal system and obtain the desired reproduction
signal, and the complicated circuit switching depending on the type of record. It is characterized
in that it does not have to be operated, and the circuit configuration is relatively simple, so that it
can be manufactured at low cost.
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