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Apparatus and method for recovery of multiphase modulated data

  • US 5,131,014 A
  • Filed: 04/19/1991
  • Issued: 07/14/1992
  • Est. Priority Date: 04/19/1991
  • Status: Expired due to Term
First Claim
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1. A clock circuit for use in recovering data from stable center portions of multiphase modulated signal components comprising:

  • means for generating a signal pulse upon the transition of a first phase component of a multiphase modulated signal transmitted at a fixed bit rate;

    oscillator means responsive to an error signal for generating a data clock signal having a frequency in synchronism with said bit rate;

    means for delaying said data clock signal by a fixed delay of approximately one half the duration of said signal pulse to provide a delayed clock;

    gate means having an enable input coupled to receive said signal pulse and a data input coupled to receive said delayed clock, for gating said delayed clock with said signal pulse to provide said error signal;

    means for coupling said error signal to said oscillator means to control the data clock frequency; and

    means responsive to said data clock for sampling components of said multiphase modulated signal to recover data therefrom.

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