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Apparatus, method and article of manufacture for the dynamic compensation of FM deviation in a FM radio receiver

  • US 5,742,641 A
  • Filed: 07/18/1996
  • Issued: 04/21/1998
  • Est. Priority Date: 07/18/1996
  • Status: Expired due to Fees
First Claim
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1. A radio data modem comprising:

  • a receiver for demodulating an FM signal received from an antenna, said receiver producing an analog baseband signal;

    an analog to digital converter for converting the analog baseband signal into a stream of digital samples;

    a compensator for scaling each sample by a deviation compensation factor;

    an adjustment means for monitoring the sample stream and continuously adjusting the deviation compensation factor;

    a decoder for decoding the compensated sample stream into a digital data stream;

    an update means for extracting a base station identifier from the digital data stream and storing the base station identifier with the adjusted deviation compensation factor in a deviation table, said update means determining whether the extracted base station identifier is representative of an expected base station and if not updating the deviation compensation factor used by the compensator with a value associated with the expected base station identifier in the deviation table.

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