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Bit synchronization circuit

  • US 5,022,057 A
  • Filed: 03/09/1989
  • Issued: 06/04/1991
  • Est. Priority Date: 03/11/1988
  • Status: Expired due to Term
First Claim
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1. A bit synchronization circuit provided for an individual subscriber'"'"'s line in a telephone exchange system, comprising:

  • latch means for receiving a plurality of clocks of different phases from a clock generating circuit provided in common to a plurality of bit synchronization circuits in said telephone exchange system, latching an input data signal transmitted thereto through said subscriber'"'"'s line in response to said plurality of clocks of different phases, and providing latched output signals corresponding to said plurality of clocks of different phases;

    detecting means for receiving said latched output signals from said latch means, and comparing said latched output signals to detect a plurality of points at which a variation in phase of said input data signal occurs in a predetermined time period;

    regenerative output selecting means for receiving a detecting signal representing whether a variation in phase of said input data signal is detected by said detecting means, and selecting a latched output signal among said plurality of latched output signals provided by said latch means; and

    phasing means for phasing said latched output signal selected by said regenerative output selecting means.

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