Watermark generator, watermark decoder, method of providing watermark signal, method of providing binary message data based on watermarked signal and computer program using improved synchronization concept

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.