Embedding supplemental data in an information signal

Details Embedding supplemental data in an information signal Embedding supplemental data in an information signal

G - Physics

11

B

G11B 20/00 (2006.01) H04N 5/913 (2006.01) H04N 7/52 (2006.01)

Patent

CA 2316996

An arrangement for embedding supplemental data (e.g. a watermark W) in an information signal (x). In an embodiment of the invention, the arrangement comprises a conventional sigma-delta modulator (20) for encoding an audio signal (x) and modifying means (2) for periodically replacing a bit of the encoded signal (y) by a bit (wi) of the watermark. In the same manner, a sync pattern (S) is embedded in the signal. The sync bits (si) are embedded at a smaller distance than the watermark bits. Preferably, the sync pattern is a pattern of contiguous bits which is typically not generated by the encoder. For the sigma-delta modulator, such a pattern is a run of ones followed by a substantially equally long run of zeroes, or vice versa.

L'invention concerne un système d'incorporation de données supplémentaires (par exemple un filigrane W) dans un signal d'information (x). Dans un mode de réalisation de l'invention, ce système comprend un modulateur classique sigma-delta (20), destiné à coder un signal audio (x), ainsi que des moyens de modification (2) servant à remplacer périodiquement un bit du signal codé (y) par un bit (w¿i?) du filigrane. De la même manière un motif de synchronisation (S) est incorporé dans le signal. Les bits de synchronisation (s¿i?) sont incorporés qui présentent un intervalle entre bits successifs inférieur à celui entre bits successifs du filigrane. De préférence, le motif de synchronisation consiste en un motif de bits contigus qui ne sont généralement pas produits par le codeur. Pour le modulateur sigma-delta, un tel motif constitue une suite de uns, suivie d'une suite de longueur sensiblement égale de zéros, ou vice versa.

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