Generador de marca de agua, decodificador de marca de agua, método para proporcionar una señal de marca de agua, método para proporcionar datos de mensaje binarios en dependencia de una señal de marca de agua y un programa de computadora que utiliza un concepto de sincronización mejorado

摘要

A watermark generator (2400) for providing a watermark signal (2420) in dependence on binary message data (2410), the watermark generator comprisines an information spreader (2430) configured to spread an information unit to a plurality of time-frequency-domain values, to obtain a spread information representation (2432). The watermark generator also comprises a synchronization inserter configured to multiplicatively combine the spread information representation (2432) with a synchronization sequence (2442) to obtain a combined information-synchronization representation (304a, So c f · m ; 2444). The watermark generator also comprises a watermark signal provider (2450) configured to provide the watermark signal (2420) on the basis of the combined information-synchronization representation (2444). A watermark decoder, methods and computer programs are also described.