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Digital signal processor delay equalization for use in a paging system

  • US 5,473,638 A
  • Filed: 01/06/1993
  • Issued: 12/05/1995
  • Est. Priority Date: 01/06/1993
  • Status: Expired due to Term
First Claim
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1. A method for compensating differences in propagation times for signals transmitted from a source to a plurality of transmitters in a paging system, so that the plurality of transmitters transmit the signal in synchronization, comprising the steps of:

  • (a) converting an analog input signal to a digital format by sampling the analog input signal at a first predefined sample rate to produce corresponding sampled digital values, each sampled digital value representing an amplitude of the analog input signal at the time it was sampled;

    (b) determining required delay intervals for each transmitter to ensure that the plurality of transmitters are synchronized;

    (c) producing at least one digital interpolated value that represents an amplitude of the analog input signal at a time intermediate the times at which the sampled digital values were produced;

    (d) storing the sampled digital values and the at least one digital interpolated value; and

    (e) at a second sample rate, selecting an appropriate one of the stored sampled digital values and the at least one digital interpolated value for at least one transmitter to introduce a time delay in the signals transmitted by said at least one of the plurality of transmitters, such that the time delay thus introduced in said signals is substantially equal to a required delay interval for said one of the plurality of transmitters and substantially synchronizes the plurality of transmitters.

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