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Ensuring EAS performance in audio signal encoding

  • US 20040120417A1
  • Filed: 12/23/2002
  • Published: 06/24/2004
  • Est. Priority Date: 12/23/2002
  • Status: Active Grant
First Claim
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1. A method of encoding an ancillary code in broadcast audio data while preserving detectability of an Emergency Alert System (EAS) code therein, comprising the steps of:

  • receiving broadcast audio data;

    encoding the broadcast audio data with an ancillary code having a first magnitude;

    providing reference data corresponding to an EAS code;

    monitoring for an EAS code by comparing the reference data with at least a portion of the broadcast audio data, to produce a match of the reference data with an EAS code present in the broadcast audio data; and

    reducing the first magnitude of the ancillary code in response to the match, such that detectability of the EAS code in the broadcast audio data in accordance with a predetermined detection method is preserved.

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