Audio watermarking system based on detection theory of chaotic phase transformation

An audio system which bases on detection theory of chaotic phase transformation is expounded aiming to detect the watermark. It utilizes the characteristic of weak signal detection by chaotic system. Set the format of watermark as a sine wave which has the same frequency of chaotic detection system. Because small movement can make the statement of chaotic system change from the state of critical cycle to the large-scale one, it can detect watermark by chaotic phase transformation. The watermark signal can be extracted by blind detection, simulation experiments are progressed from these aspects, and the result indicates that the algorithm has highly security and robustness.