Provide audio or video signal that has been decoded is derived from an audio or video signal is decoded and low bit rate coding, the watermark is embedded watermark is embedded

摘要

Various audio signal watermarking systems are known, which are also applied to digitally encoded audio signals. However, in current audio signal watermarking systems the watermark signal and its watermark payload do not survive very low bit rate audio coding, in particular parametric coding. According to the invention, a watermarked uncompressed audio signal bitstream is low-bit rate compressed, but the watermarking is removed and the watermark's payload only is transmitted together with the compressed audio signal bitstream. At decoder side, the received audio signal bitstream is de-compressed and watermarked again using the transmitted watermark payload. Advantageously, it does not matter that the compressed bitstream is not watermarked because the compressed bitstream can be encrypted prior to transmission.