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Data communication system having improved synchronization capability

  • US 5,787,132 A
  • Filed: 07/20/1995
  • Issued: 07/28/1998
  • Est. Priority Date: 07/25/1994
  • Status: Expired due to Term
First Claim
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1. A data receiving unit comprising:

  • A) data receiving means for receiving, through a transmission path, transmission data which has been encoded according to a predetermined transmission code using a predetermined transmission clock signal and which includes a reference pulse having a pulse width corresponding to a period of said transmission clock signal;

    B) clock generating means for generating a received clock signal in synchronization with said transmission data, said clock generating means includingi) an oscillator generating a reference clock signal having a period which is shorter than said period of said transmission clock signal,ii) a counter counting an interval between points of change of said transmission data according to said reference clock signal,iii) a reference pulse detector detecting said reference pulse based on a count value from said counter, andiv) a received clock signal generating circuit generating said received clock signal in synchronization with said transmission data by frequency-dividing said reference clock signal based on a count value of said counter when said counter counts said pulse width of said reference pulse; and

    C) data decoding means for decoding said transmission data using said received clock signal.

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