Methods for audio watermarking and decoding

CAFC
  • US 6,983,051 B1
  • Filed: 01/18/2000
  • Issued: 01/03/2006
  • Est. Priority Date: 11/18/1993
  • Status: Expired due to Fees
First Claim
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1. A method of embedding multi-bit auxiliary data into an input audio signal that is thereafter compressed to yield a compressed signal, and thereafter discerning the multi-bit auxiliary data from a non-identical counterpart to said audio signal obtained by decompressing the compressed signal, the method comprising:

  • providing an input audio signal representing a plurality of sequential series of audio data, each series comprising a plurality of samples, each sample having a value associated therewith;

    for each of a plurality of samples in a series, transforming the value thereof in accordance with at least some of said multi-bit auxiliary data, wherein an encoded series of audio data is produced having the auxiliary data embedded therein;

    repeating the foregoing transformation for a plurality of different series of said audio signal, thereby yielding a first encoded audio signal in which the auxiliary data is redundantly encoded through different temporal excerpts thereof;

    compressing the first encoded audio signal;

    decompressing the compressed, first encoded audio signal to produce a second encoded audio signal, said second encoded audio signal being non-identical to the first due to said compression/decompression process; and

    discerning the multi-bit auxiliary data from the second encoded audio signal without reference to the input audio signal.

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