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US 2008/0131083 A1Published application
Audio Encoding to Convey Auxiliary Information, and Media Embodying Same
AssigneeDigimarc Corporation
InventorGeoffrey B. Rhoads
Life of this patent
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Abstract
Methods of processing audio to convey auxiliary information hidden therein are provided. Various arrangements are disclosed. One alters data representing audio to include a sequence of bits of auxiliary information. The altering is based on a carrier signal and corresponding to the sequence of bits, and is based on a perceptibility threshold that varies within the data representing audio. Other arrangements are provided as well.
Claims18
A method of embedding data in an audio signal comprising:
- providing a message comprising message bits;
- associating carrier signals with the message bits;
- modulating the carrier signals according to values of the associated message bits, the modulating changing a property of the carrier signal to correspond with a desired value of the associated message bit;
- adjusting the modulated carrier signals as a function of a perceptibility threshold computed from the audio signal where the carrier signals are to be embedded;
- and
- combining the adjusted carrier signals with the audio signal.
3 more elements
A method of detecting data embedded in an audio signal, the method comprising:
- applying a carrier signal to the audio signal to produce an output signal including peaks corresponding to embedding locations of the carrier signal;
- analyzing the output signal to perform a registration of the embedding locations in the output signal;
- and
- determining message values from the peaks at the embedding locations in the output signal.
1 more element
Dependencies are inferred from the claim text.