Citizens band radio receiver with squelch control
First Claim
1. In combination with a radio receiver of the type adaptive for operation in an eight-track record tape deck and consisting of a receiver section providing audio frequency signal output, an audio frequency amplifier and an audio output, an automatic squelch control circuit comprising:
- means receiving said audio frequency signal output to provide first input to said audio frequency amplifier;
amplifier means receiving said audio frequency signal output and generating second input to said audio frequency amplifer that is additive with said first input and in phase opposition thereto;
rectifier means receiving the output of said audio frequency amplifier to develop a D-C control signal proportional to said output; and
means applying said D-C control signal as input to said amplifier means, whereby excessive input signals to said audio frequency amplifier will proportionately reduce the amplifier means second input to said audio frequency amplifier to provide relatively greater amplitude for input thereto.
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Accused Products
Abstract
Tape deck adapter apparatus for radio reception, especially for reception of citizen band transmission having widely variable noise levels. The device consists of a receiver which is adaptable for use within a conventional tape deck for energization and operation; the receiver then includes an automatic squelch control circuit of the type which is particularly useful in receiving incoming citizen band transmissions. The automatic squelch control includes reactive means controlling input to the output audio amplifier, such reactance means being controlled by a DC feedback component as derived from the audio output signal, for application to control conduction of the reactance means, and therefore, the amplification of the audio output stage.
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Citations
6 Claims
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1. In combination with a radio receiver of the type adaptive for operation in an eight-track record tape deck and consisting of a receiver section providing audio frequency signal output, an audio frequency amplifier and an audio output, an automatic squelch control circuit comprising:
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means receiving said audio frequency signal output to provide first input to said audio frequency amplifier; amplifier means receiving said audio frequency signal output and generating second input to said audio frequency amplifer that is additive with said first input and in phase opposition thereto; rectifier means receiving the output of said audio frequency amplifier to develop a D-C control signal proportional to said output; and means applying said D-C control signal as input to said amplifier means, whereby excessive input signals to said audio frequency amplifier will proportionately reduce the amplifier means second input to said audio frequency amplifier to provide relatively greater amplitude for input thereto. - View Dependent Claims (2, 3, 4, 5)
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6. In combination with a radio receiver of the type adaptive for operation in an eight-track record tape deck and consisting of a receiver section providing audio frequency signal output, an audio frequency amplifier and an audio output, an automatic squelch control circuit comprising:
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means receiving said audio frequency signal output to provide first input to said audio frequency amplifier; amplifier means receiving said audio frequency signal output and generating second input to said audio frequency amplifier that is additive with said first input and in phase opposition thereto; high gain amplifier means receiving input of said audio frequency signal output to generate a control output; rectifier means receiving the control output from said high gain amplifier to develop a D-C control signal proportional to said output; and means applying said D-C control signal as input to said amplifier means, whereby excessive input signals to said audio frequency amplifier will proportionately reduce the amplifier means second input to said audio frequency amplifier to provide relatively greater amplitude for input thereto.
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Specification