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Apparatus and methods for including codes in audio signals

  • US 20030081781A1
  • Filed: 07/12/2002
  • Published: 05/01/2003
  • Est. Priority Date: 03/31/1994
  • Status: Active Grant
First Claim
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1. An apparatus for including a code having at least one code frequency component with an audio signal having a plurality of audio signal frequency components, comprising:

  • first masking evaluation means for evaluating a masking ability of a first set of the plurality of audio signal frequency components to mask the at least one code frequency component to human hearing to produce a first masking evaluation;

    second masking evaluation means for evaluating a masking ability of a second set of the plurality of audio signal frequency components different from the first set thereof to mask the at least one code frequency component to human hearing to produce a second masking evaluation;

    amplitude assigning means for assigning an amplitude to the at least one code frequency component based on a selected one of the first and second masking evaluations; and

    code inclusion means for including the at least one code frequency component with the audio signal.

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