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Method and apparatus for synchronizing to a synchronous selective call signal

  • US 5,555,183 A
  • Filed: 02/03/1994
  • Issued: 09/10/1996
  • Est. Priority Date: 12/02/1991
  • Status: Expired due to Term
First Claim
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1. In a selective call receiver having a power consuming circuit for receiving a synchronous communication signal having a multiplicity of frames, each of the multiplicity of frames havinga frame synchronization signal anda frame identification signal being a member of a plurality of frame identification signals, each of the plurality of frame identification signals occurring in a predetermined sequence, the selective call receiver having means for storing, the means for storing having an assigned frame identification signal corresponding to one of the plurality of frame identification signals and a first mask, a method of conserving power during an interval of time after acquiring frame synchronization and before a first occurrence of a desired frame of the multiplicity of frames, comprising the steps of:

  • enabling the power consuming circuit;

    receiving the frame synchronization signal to acquire frame synchronization;

    receiving one of the plurality of frame identification signals to produce a received frame identification signal;

    wherein each frame comprises a second mask;

    comparing the assigned frame identification signal with the first mask stored in the selective call receiver and the second mask received from the one of the plurality of frames to generate a plurality of assigned frame identification signals;

    determining the first occurrence of the desired frame of the multiplicity of frames as a result of the plurality of assigned frame identification signals generated in the step of comparing; and

    disabling the power consuming circuit until the first occurrence of the desired frame.

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