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Post-compression hidden data transport

  • US 5,687,191 A
  • Filed: 02/26/1996
  • Issued: 11/11/1997
  • Est. Priority Date: 12/06/1995
  • Status: Expired due to Term
First Claim
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1. A method for providing auxiliary data subband samples in a compressed subband coded digital audio data stream, comprising the steps of:

  • providing a plurality of audio subband samples from said data stream;

    providing a data carrier sequence;

    modulating said data carrier sequence by an auxiliary data signal to provide said auxiliary data subband samples;

    combining said auxiliary data subband samples with corresponding audio subband samples to produce combined subband samples in which said auxiliary data subband samples are carried substantially inaudibly; and

    providing said combined subband samples for transport in said digital audio data stream.

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