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Selective call communication receiver

  • US 4,385,398 A
  • Filed: 06/07/1979
  • Issued: 05/24/1983
  • Est. Priority Date: 06/07/1979
  • Status: Expired due to Term
First Claim
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1. In a selective call communication receiver adapted to respond to at least one code tone selected from a plurality of code tones of different frequencies, the combination comprising filter means responsive to a code tone of predetermined frequency to provide a sinusoidal wave, means for converting the sinusoidal wave into a train of tone pulses, and circuit means responsive to the first of the tone pulses exceeding a predetermined duration to provide an output signal, the output signal commencing during the first of the tone pulses, the predetermined duration being substantially the same for all of the different frequencies, said circuit means having only on and off conditions, the output signal being produced when said circuit means is in one of the conditions.

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