Covert audio watermarking using perceptually tuned signal independent multiband phase modulation

An algorithm for covert digital audio watermarking is presented. The method embeds a low-rate (in the neighborhood of 20–30 b/sec) watermark via perceptually insignificant long term multiband phase modulation, The watermark is very difficult to either discover or recover without the original (unmodulated) signal. The algorithm is shown to be robust to perceptual coding.