An Audio Watermarking Algorithm Based On Chaotic Encryption

With the rapid development of computer and Internet,a mass of digital audio, video products and music products manufacture and release. In order to prevent illegal copy, forge and the distortion, audio copyright protection appears more and more important. The audio digital watermark technology is proposed under this background. An audio watermarking algorithm based on chaotic encryptionis can realize copyright protection, information security and so on.Chaotic system has attracted extensive interests in cryptanalysis and communications because of its noise-like, unpredictable yet deterministic orbits and sensitivity to initial condition and parameters.The application of watermarking system using chaotic systems is discussed from three aspects in this article. According to embedding algorithm, a audio watermarking detect algorithm basing on wavelet domain is realized. This method uses chaotic sequence to choose the embedding position and combines the mean quantization. Embedding the watermarking in low frequency wavelet coefficient, and then retrieval of embedded watermark with blind detection. Audio system which bases on theory of chaotic phasic-transformation detection is expounded aiming to detect the watermarking. 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 detect system. Because small movement can make the statement of chaotic system change from critical cycle to large-scale cycle, it can detect watermark by chaotic phasic-transformation. Aiming at the former treatment of watermarking, a watermarking method basing on frequency modulation differential chaos shift keying(FM-DCSK) is discussed. The Embedding watermarking information, which is modulated, linked theory of spread spectrum communication in this method.Simulation experiments are progressed from these aspects, and the result indicates that the algorithm has highly security and robustness.