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FRAME SYNCHRONIZATION SYSTEM FOR A DIGITAL COMMUNICATION SYSTEM

  • US 3,735,045 A
  • Filed: 08/24/1970
  • Issued: 05/22/1973
  • Est. Priority Date: 08/24/1970
  • Status: Expired due to Term
First Claim
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1. A frame synchronization system comprising:

  • a source of binary information signal having a given bit rate and containing a synchronization component;

    first means to produce a plurality of timing signals;

    second means coupled to said source and said first means to examine successive bits of said information signal to recognize said synchronization component and produce a resultant output signal at each examination indicating either an insynchronization condition or an out-of-synchronization condition;

    third means to integrate said resultant output signal;

    fourth means coupled to the output of said third means responsive to the integrated output signal thereof to produce a first control signal indicating either an in-synchronization condition or an out-of synchronization condition;

    fifth means coupled between said second and third means and to said fourth means responsive to said first control signal to adjust the amplitude of said resultant output signal applied to said third means to enable said third means to perform a slow integration of said resultant output signal for an insynchronization condition of said first control signal and a fast integration of said resultant output signal for an out-ofsynchronization condition of said first control signal; and

    sixth means coupled to said first means, said second means, said third means and said fourth means to provide a second control signal for timing adjustment of said timing signals when said resultant output signal and said first control signal indicate an out-of-synchronization condition and the amplitude of the result of said fast integration of said third means has exceeded a given value.

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