Auxiliary channel masking in an audio signal

G - Physics – 11 – B

Patent

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G11B 20/00 (2006.01) H04H 20/31 (2009.01)

Patent

CA 2424390

A method is provided for embedding data into an audio signal and determing data embedded into an audio signal. In the method for embedding data into an audio signal, the audio signal is based on a first set of data and includes a phase component. The method modifies at least a portion of the phase component of the audio signal to embed a second set of data into the audio signal. The modified audio signal can be made to differ with respect to the audio signal in a manner at least one of (i) substantially imperceptible and (ii) imperceptible to a listener of the first set of data depending on the extent that the phase component of the audio signal is modified. In the method for determining data embedded into an audio signal, the audio signal is based on a first set of data of an original audio signal and includes a phase component. The method determines a second set of data embedded into the audio signal based on the phase component of the audio signal. The audio signal differs with respect to the original audio signal in a manner that is at least one of (i) substantially imperceptible and (ii) imperceptible to a listener of the first set of data.

L'invention concerne un procédé d'incorporation de données dans un signal audio et de détermination de données incorporées dans un signal audio. Selon le procédé d'incorporation de données dans un signal audio, le signal audio est basé sur un premier ensemble de données et comporte une composante de phase. Le procédé modifie au moins une partie de la composante de phase du signal audio afin d'incorporer un deuxième ensemble de données dans le signal audio. Le signal audio modifié peut être rendu différent du signal audio en ce qu'il est pratiquement imperceptible (i) et/ou imperceptible (ii) par un auditeur du premier ensemble de données en fonction du degré de modification de la composante de phase du signal audio. Selon le procédé de détermination de données incorporées dans un signal audio, le signal audio est basé sur un premier ensemble de données d'un signal audio original et comporte une composante de phase. Le procédé détermine un deuxième ensemble de données incorporées dans le signal audio basé sur la composante de phase du signal audio. Le signal audio diffère du signal audio original en ce qu'il est pratiquement imperceptible (i) et/ou imperceptible (ii) par un auditeur du premier ensemble de données.

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