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Receiver for phase shift modulated carrier signals

  • US 4,641,325 A
  • Filed: 02/04/1985
  • Issued: 02/03/1987
  • Est. Priority Date: 02/04/1985
  • Status: Expired due to Fees
First Claim
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1. Apparatus for providing a local oscillator signal with a frequency which is at all times equal to a constant multiple of the frequency of a reference waveform, comprising:

  • means, responsive to said reference waveform, for providing an interrupt signal upon the occurrence of a predetermined point in each cycle of said reference; and

    digital processing means for providing said local oscillator signal, said digital processing means being responsive to said interrupt signal for determining the number of pulses of said local oscillator signal provided during one cycle of said reference waveform and for modulating the frequency of said local oscillator such that the number of local oscillator pulses provided during one cycle of said reference waveform is maintained to substantially equal said constant, said digital processing means comprising a microprocessor adapted to provide said local oscillator signal, and responsive to said interrupt signal for determining the number of local oscillator pulses provided during one cycle of said reference and for modulating the number of local oscillator pulses provided to maintain this number to substantially equal said constant.

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