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Circuit for discriminating received signal modulation type

  • US 5,600,673 A
  • Filed: 12/01/1995
  • Issued: 02/04/1997
  • Est. Priority Date: 12/05/1994
  • Status: Expired due to Term
First Claim
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1. A circuit for discriminating the modulation type of a received signal, comprising:

  • a clock recovery circuit for recovering a data clock from received data;

    a phase difference detector for detecting a phase difference between the data clock recovered by said clock recovery circuit and the received data;

    a deviation calculation circuit for calculating a deviation between the phase difference detected by said phase difference detector and a deviation reference value preset in accordance with a modulation type;

    a squaring circuit for squaring the deviation calculated by said deviation calculation circuit;

    an average value calculation circuit for calculating an average value of a predetermined plurality number of consecutive ones of the square output calculated by said squaring circuit; and

    a comparator for comparing the average value calculated by said average value calculation circuit with a predetermined decision reference value and outputting a discrimination signal in accordance with the comparison results.

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