An approach to enhance the robustness of audio watermark based on Turbo code

We present an approach to enhance robustness of audio watermark based on Turbo code. Firstly, we encode the decreased dimensional watermark sequence using Turbo code, then embed the watermark sequence into the diagonal matrix which has been decomposed by the singular value using low frequency coefficients after the wavelet transform. Finally, we can get the watermark sequence during the watermark extraction, decoded it with the Turbo iterative decoding algorithm. In this article, a pseudo random interleaver is added to the Turbo encoder to enhance the robustness of anti-burst-error. Simulations results show that the algorithm is with strong robustness on anti-general random errors attack and good robustness on anti-burst errors attack.