WATERMARK GENERATOR, WATERMARK DECODER, METHOD OF GENERATING WATERMARK SIGNAL, METHOD OF GENERATING BINARY MESSAGE DATA DEPENDING ON WATERMARKED SIGNAL AND COMPUTER PROGRAM BASED ON IMPROVED SYNCHRONISATION CONCEPT

摘要

FIELD: data processing.;SUBSTANCE: invention relates to means of generating, encoding and decoding a watermark. Watermark generator, which generates an electronic watermark signal based on binary message data, including in its structure an information spreader configured to spread an information unit to a plurality of time-frequency-domain values, to obtain a spread information representation. Watermark generator also includes a synchronization inserter configured to multiplicatively combine spread information representation with a synchronization spread sequence to obtain a combined information-synchronization representation. Watermark generator also includes watermark signal provider configured to provide watermark signal on basis of combined information-synchronization representation. Also described are a watermark decoder, methods and computer program.;EFFECT: technical result consists in ensuring reliable synchronisation when transmitting watermark.;19 cl, 41 dwg