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Communications system and receiver for use therein which indicates time based on a selected time message signal from a central station

  • US 5,363,377 A
  • Filed: 04/09/1993
  • Issued: 11/08/1994
  • Est. Priority Date: 04/09/1992
  • Status: Expired due to Fees
First Claim
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1. A receiving apparatus for use in a communication system wherein a succession of time message signals are transmitted to the receiving apparatus by a central station, each time message signal indicating its time of transmission with an accuracy which varies with different time message signals;

  • said receiving apparatus comprising;

    a receiving section for receiving the time message signals and decoding means coupled thereto for decoding said signals so as to derive the transmission times indicated thereby;

    storage means for storing the indicated transmission times of the received time message signals;

    timing means for producing timing signals indicative of actual time in relation to a reference time setting of said timing means, said reference time setting being the indicated transmission time of a received time message signal which has been selected and supplied to said timing means as a current time reference signal; and

    control means for selecting and supplying time reference signals to said timing means, said control means being adapted to(i) determine from said timing signals an indicated time of reception of a presently received time message signal, as based on a current reference time setting of said timing means; and

    (ii) compare the indicated reception and transmission times of the presently received time message signal with the indicated reception and transmission times of the current time reference signal, from said comparison determine whether the presently received time message signal is more accurate than the current time reference signal, and in that event select and supply the presently received time message signal to said timing means as a new time reference signal replacing the current time reference signal.

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