MULTI-CARRIER WATERMARKS

A watermark embedder encodes auxiliary information, such as binary message, into a host media signal (106) by modulating message signals (100) with two or more corresponding carrier signals (104) to form a watermark signal and embeds this signal into the host (108). A compatible watermark decoder uses the carrier signals to demodulate the message signals from the watermarked signal. A watermark embedder encodes auxiliary information, such as a binary message, into a host media signal by modulating message signals with two or more corresponding carrier signals to form a watermark signal and embeds this signal into the host. A compatible watermark decoder uses the carrier signals to demodulate the message signals from the watermarked signal. L'invention porte sur un incorporateur de filigranes codant des informations auxiliaires telles que des messages binaires dans le signal d'un support hôte en modulant les signaux des messages à l'aide d'au moins deux signaux de porteuses correspondants pour former un signal filigrané qui s'incorporera à l'hôte, et sur un décodeur compatible de filigranes utilisant les signaux des porteuses pour démoduler les signaux des messages du signal filigrané.