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Digital demodulator

  • US 5,260,975 A
  • Filed: 07/25/1991
  • Issued: 11/09/1993
  • Est. Priority Date: 10/23/1989
  • Status: Expired due to Term
First Claim
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1. A digital demodulator comprising:

  • reference signal generation means for generating a predetermined reference signal responsive to a received phase modulated signal;

    detector means for detecting said phase modulated signal using the reference signal;

    reception level indicating means for providing a signal indicative of a reception level of said received phase modulated signal;

    phase difference detection means in said reference signal generation means for detecting a phase difference between a phase of said reference signal and a phase of said phase modulated signal and for outputting said difference as phase difference data;

    reference signal phase prediction means in said reference signal generation means for receiving said phase difference data, for predicting a phase which is to be newly set for said reference signal and for outputting reference signal phase prediction data corresponding to said predicted phase and determined responsive to said reception level signal;

    reference signal control means in said reference signal generation means for generating said reference signal based on said reference signal phase prediction data; and

    input clock means for providing a clock signal to said reference signal control means, said reference signal having a phase designated by said input clock means.

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