Apparatus and method for embedding and extracting...

G - Physics – 11 – B

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G11B 20/00 (2006.01) H04N 1/387 (2006.01) H04H 1/00 (2006.01)

Patent

CA 2335975

Apparatus and methods are provided for embedding or encoding auxiliary signals (6) into an analog host or cover signal (2). A replica of the cover signal or a portion of the cover signal in a particular domain (time, frequency or space) is generated according to a stego key (9) specifying modification values to specified parameters of the cover signal. The replica signal is then modified by an auxiliary signal corresponding to the information to be embedded, and inserted back into the cover signal. Embedded auxiliary signals are extracted by generating replicas of received signals and correlating the replicas with the received signals.

L'invention porte sur un appareil et un procédé d'enfouissage ou de codage de signaux (6) auxiliaires dans un hôte analogique ou dans un signal (2) de couverture. Une réplique du signal de couverture ou une partie du signal de couverture dans un domaine particulier (temps, fréquence ou espace) est créée en fonction d'un code (9) STEGO spécifiant des valeurs de modification à des paramètres spécifiques du signal de couverture. Le signal réplique est alors modifié par un signal auxiliaire correspondant à l'information à enfouir puis réinséré dans le signal de couverture. On extrait les signaux auxiliaires enfouis en créant des répliques de signaux reçus, puis en corrélant les répliques avec les signaux reçus.

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