×

Transmitting circuit and receiving circuit

  • US 5,365,543 A
  • Filed: 09/27/1993
  • Issued: 11/15/1994
  • Est. Priority Date: 12/09/1991
  • Status: Expired due to Term
First Claim
Patent Images

1. A receiving circuit for receiving a transmitted data signal which is coded by a first chip code signal having a predetermined signal pattern to spread spectrum of the transmitted data and is modulated by a carrier signal, said receiving circuit comprising:

  • (a) receiving means for receiving said transmitted data signal;

    (b) demodulation means for demodulating said received data signal;

    (c) chip code signal generation means for generating a second chip code signal having said predetermined signal pattern;

    (d) decoding means for decoding said demodulated data signal with said second chip code signal;

    (e) detection means for detecting whether said second chip code signal is in an asynchronous condition with said received data signal to produce an asynchronous detection signal;

    (f) synchronizing means for synchronizing said second chip code signal with said first chip code signal included in said received data signal in response to said asynchronous detection signal; and

    (g) control means responsive to said detection means for measuring a time interval for which said asynchronous detection signal is produced continuously and for supplying said asynchronous detection signal to said synchronizing means when said time interval is longer than a predetermined interval.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×