Automatic signal switching apparatus for a combined transceiver and radio or tape recorder set
First Claim
1. An improved automatic switching system in a combination transceiver set and radio or tape recorder set which contains an output amplifier circuit, a first source of audio signals and a first audio output circuit, and means associated with the transceiver set for receiving audio signals and for reproducing said received audio signals including a second audio output circuit, comprising:
- a first switching transistor in the first audio output circuit;
a first diode between the first audio output circuit and the output amplifier circuit;
a noise squelching circuit in the transceiver;
a second switching transistor in the noise squelching circuit;
a second diode between the second audio output circuit and the output amplifier circuit; and
circuit means responsive to the second switching transistor upon the receipt of audio signals by the transceiver set, to cause the first switching transistor to bias the first diode to cut-off condition and to bias the second diode to conducting condition whereby to operatively connect only the second audio output circuit with the output amplifier circuit.
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Accused Products
Abstract
An improved automatic switching system for switching between two sources of audio signals in a combination transceiver set and radio or tape recorder set. A transistor in the squelch control circuit of the transceiver set switches the audio signals from either the transceiver set or from the radio or tape recorder set through respective switching diodes to an output amplifier circuit, thereby reducing the complexity and cost of the system.
11 Citations
8 Claims
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1. An improved automatic switching system in a combination transceiver set and radio or tape recorder set which contains an output amplifier circuit, a first source of audio signals and a first audio output circuit, and means associated with the transceiver set for receiving audio signals and for reproducing said received audio signals including a second audio output circuit, comprising:
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a first switching transistor in the first audio output circuit; a first diode between the first audio output circuit and the output amplifier circuit; a noise squelching circuit in the transceiver; a second switching transistor in the noise squelching circuit; a second diode between the second audio output circuit and the output amplifier circuit; and circuit means responsive to the second switching transistor upon the receipt of audio signals by the transceiver set, to cause the first switching transistor to bias the first diode to cut-off condition and to bias the second diode to conducting condition whereby to operatively connect only the second audio output circuit with the output amplifier circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification