Device for marking and restoring multimedia signals

Details Device for marking and restoring multimedia signals Device for marking and restoring multimedia signals

H - Electricity

04

N

H04N 7/26 (2006.01) H04N 1/32 (2006.01)

Patent

CA 2503466

The invention concerns a device for processing a signal comprising a signal transforming module (5) capable of producing a transformed signal (xi) from an original signal and a mixing module (10) for marking the transformed signal with a marking message (M). The mixing module (10) comprises: a formatting module (14) capable of calculating a response of the transformed signal (rx) to the demodulation of a first set of carriers (Gj) defined by keys protecting the message and of calculating a marking information ({bj}) based on said response and code words (U) associated with the marking message, a modulator (18) capable of modulating marking data supplied by the formatting module (14) with a given coefficient (Gij) of the carriers of the first set of carriers, and of modulating in amplitude the resulting coefficient by a corresponding quantity related to the energy weighting term of the marking message and to the set of carrier, thereby supplying a marking coefficient, an adder (20) capable of adding the marking coefficient to the corresponding coefficient of the original transformed signal.

L'invention propose un dispositif de traitement d'un signal comprenant un module de transformation de signal (5) capable de produire un signal transformé (xi) à partir d'un signal original et un module mélangeur (10) destiné à marquer le signal transformé par un message de marquage (M). Le module mélangeur (10) comprend - un module de mise en forme (14) capable de calculer une réponse du signal transformé (rx) à la démodulation d'un premier ensemble de porteuses (Gj) définies par des clés de protection du message et de calculer une information de marquage ({bj}) en fonction de cette réponse et de mots de codes (U) associés au message de marquage, un modulateur (18) capable de moduler les informations de marquage fournies par le module de mise en forme (14) par un coefficient donné (Gij) des porteuses du premier ensemble de porteuses, et de moduler en amplitude le coefficient ainsi obtenu par une quantité correspondante liée au terme de pondération de l'énergie du message de marquage et à l'ensemble de porteuses, ce qui fournit un coefficient de marquage, - un additionneur (20) capable d'ajouter le coefficient de marquage au coefficient correspondant du signal original transformé.

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