Audio watermarking to convey auxiliary information, and media embodying same

CAFC
  • US 7,181,022 B2
  • Filed: 03/25/2003
  • Issued: 02/20/2007
  • Est. Priority Date: 11/18/1993
  • Status: Expired due to Fees
First Claim
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1. A method of processing audio to convey auxiliary information therewith, the audio being represented by primary data, the auxiliary information being included with plural-bit auxiliary data, the method comprising:

  • receiving the plural bit auxiliary data; and

    encoding the plural-bit auxiliary data into the primary data without audible evidence of data alteration;

    wherein the encoding includes;

    for a bit of the auxiliary data, adding a scaled carrier signal corresponding to the bit to adjust a characteristic of a group of corresponding audio samples in the audio data so that the scaled carrier signal corresponds to a symbol value of the bit; and

    repeating the adding of a scaled signal corresponding to bits in the auxiliary data to form a sequence of groups of audio carrying the plural bit auxiliary data, wherein the plural bit auxiliary data includes fixed auxiliary data distributed over the sequence of groups for detection and registration of the auxiliary data in the audio.

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