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Receiver for phase-shift modulated carrier signals

  • US 4,475,217 A
  • Filed: 11/03/1982
  • Issued: 10/02/1984
  • Est. Priority Date: 11/03/1982
  • Status: Expired due to Fees
First Claim
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1. A receiver for recovering digital data modulated upon a carrier waveform in a digital communication system comprising:

  • (a) first frequency generating means responsive to a first servo control signal for producing first and second local oscillator signals;

    (b) mixing means coupled to said first frequency generating means for mixing the modulated carrier with each of said first and second local oscillator signals to form first and second recovered modulation signals, respect- ively;

    (c) first filtering means coupled to said mixing means for increasing the signal-to-noise ratio in said first and second recovered modulation signals;

    (d) second filtering means responsive to a first system timing signal and coupled to said first filtering means for further increasing the signal-to-noise ratio in said first and second recovered modulation signals to form data and servo signals, respectively; and

    (e) first multiplier means coupled to said second filtering means for multiplying said data and servo signals to form the first servo control signal.

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