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Detection of signal modifications in audio streams with embedded code

  • US 7,451,092 B2
  • Filed: 03/05/2004
  • Issued: 11/11/2008
  • Est. Priority Date: 07/14/2000
  • Status: Expired due to Term
First Claim
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1. A method of processing a signal comprising:

  • receiving the signal at a receiver to produce a received signal;

    decoding the received signal so as to read a coefficient value count code from the received signal;

    performing a transform of the received signal to produce transform coefficients;

    counting those transform coefficients having a predetermined value;

    comparing the coefficient value count contained in the coefficient value count code to the transform coefficient count; and

    selectively further processing or discarding the received signal based upon the comparison of the coefficient value count contained in the coefficient value count code to the transform coefficient count.

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