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Apparatus for and method of synchronising oscillators within a data communication system

  • US 6,701,133 B1
  • Filed: 10/06/2000
  • Issued: 03/02/2004
  • Est. Priority Date: 11/03/1997
  • Status: Expired due to Term
First Claim
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1. A data communication system comprising a master unit containing a master clock and at least one remote unit, the or each remote unit having a local oscillator, in which the master unit transmits a signal containing at least first and second pilot signals at predetermined frequencies, and in which the or each remote unit is arranged to receive the pilot signals, to compare the frequencies of the received pilot signals with a local record of their frequencies, and to adjust the frequency of the local oscillator to reduce the difference between the received and expected pilot signal frequencies to below a threshold, wherein the received pilot signals comprise a pilot tone recovered from both the upper and lower sidebands of a carrier signal comprising the received signals.

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