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FIELD OF THE INVENTION The present invention relates to signal switching devices in audio and
video systems. The configuration of the prior art and its problems In general, in an audio system,
as shown in FIG. Although the signal selector switch 12 is switched to select a signal to be
reproduced, in order to reproduce a target signal, both the switch 2 of the external device 1 and
the signal switch 11a of the control amplifier 7 have to be operated. There is a problem that the
operation becomes complicated. Therefore, conventionally, when the switch 2 of the external
device 1 is pressed, the control circuit 3 outputs a control signal as shown in FIG. 2A to the
output terminal 5 by the logic circuit 3, and this is used as the input terminal of the logic circuit
1Q of the control amplifier 7. 8, and switches the electronic switch 12 through the logic circuit
1o according to the control signal. However, in this case, there is a problem that one more
connection line is required apart from the signal for passing of the control signal, and as the
number of external devices increases, the connection line increases and the connection becomes
complicated. In FIG. 1, 4 is an amplifier for signal amplification of the external device 1, 6 is a
signal output terminal, 9a to 9C are signal input terminals, 13 is an amplifier for signal
amplification of the control amplifier 7, and 14 is an output of signal The object of the present
invention is to eliminate such drawbacks of the prior art, and to provide a signal switching device
which realizes selection of signals with simple operation and less wiring. The signal switching
device of the present invention is a signal switching device having at least two or more input
terminals, comprising an electronic switching switch, a logic control circuit for controlling the
electronic switching switch, and a detection circuit for detecting an input signal, A control signal
transmitted from an external device connected to the input terminal is detected to control an
electronic switch for signal switching. In this case, the connection line connecting the external
device and the control amplifier may be only for signals, and the control connection line is not
required at all. DESCRIPTION OF THE PREFERRED EMBODIMENT A signal switching device
according to an embodiment of the present invention will be described below with reference to
the drawings. In this embodiment, input signals at input terminals 9a to 9C of the control
amplifier 7 shown in FIG. 3 are detected by detection circuits 15a to 16c, and if they are control
signals, the electronic switch 12 is switched by the logic circuit 10. At the same time, the
detection circuit 15 for detecting the output signal of the output terminal 6 is provided also in
the external device 1, the signal of the output terminal 6 is detected, and the logic circuit 3
controls whether to output the control signal according to the state. The
In this way, when the switch 2 of the external device 1 is pressed, if the electronic switch 12a of
the control amplifier 7 is off, the output terminal 6 of the external device 1 becomes open. A
detection signal is output to the output terminal 6 by receiving it and receiving the signal at the
input terminal 9a of the control amplifier 70, detecting the control signal by the detection circuit
16a, and passing it through the logic circuit 1o. The electronic switch 12a can be turned on,
whereby a signal can be selected and reproduced. As described above, the signal switching device
according to the present invention can be operated simply by operating an external device
without using a control connection line in addition to the signal connection line. The present
invention makes it possible to reproduce a target signal, and the signal switching operation of the
control amplifier is unnecessary, and the connection is also simple because it is only a signal line.
Brief description of the drawings
1 is a block diagram of a conventional signal switching device, FIG. 2 is a signal waveform
diagram of the main part of FIG. 1, FIG. 3 is a block diagram of a signal switching device in an
embodiment of the present invention, and FIG. 01 и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и
и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и amplifier amplifier 5 Control signal output
terminal 6, signal output terminal 7, control amplifier 8a, 8b, 8c: Control input terminal.
9a, 9b, 9c ииииии Signal input terminal, 10 ииииии Logic circuit, 11a, 11b, 11c иии Switch, 12a, 12b, 1'2
cm electronic switch, 13 иии и и и и и и и и и и и и и и и и и Outgoing terminal, 15, 16a. 16b, 16c... Detection
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