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Muting circuit for a radio receiver

  • US 3,939,431 A
  • Filed: 11/25/1974
  • Issued: 02/17/1976
  • Est. Priority Date: 11/25/1974
  • Status: Expired due to Term
First Claim
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1. A method of muting a radio receiver during the reception of audio frequency data or signals of a predetermined frequency, including the steps of:

  • a. monitoring the audio frequency signals in the receiver and providing a pulse for each zero crossing thereof;

    b. using the pulses provided to produce a delayed window subsequent to each pulse, which window is delayed a period equal to the time between zero crossings of data of the predetermined frequency; and

    c. comparing the occurrence of the pulses and the windows and muting the receiver for a period longer than the delay between windows each time a pulse and a window coincide.

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