Patent ID: 8175325

Claim:
A method for encoding symbols carrying payload data for watermarking therewith an audio or video signal, said watermarking using modulation with reference sequences, wherein said payload data symbols can be recovered at decoding side by demodulation using corresponding reference sequences, and wherein in each case a number N of said payload data symbols together form a watermark data frame and a number of M watermark data bits are assigned to each payload data symbol, said method comprising the steps: modulating said payload data for a current watermark data frame using N*2 M different ones of said reference sequences, one reference sequence for each watermark data bit value, N being an integer greater than ‘1’ and ‘M’ being an integer greater than ‘0’, and assembling said payload data symbols of said current watermark data frame without adding synchronization symbols; psycho-acoustically shaping said current watermark data frame and embedding it in said audio or video signal for output; continuing with the corresponding steps for the next watermark data frame.