Digital Audio Watermarking Algorithms Base On Stochastic Resonance And Fast Synchronization In Time Domain

With the rapid development of the digital technique in recent years,digital image,audio and video have become more popular,and increase the efficiency of the information broadcasting. The development of computer network technique predigests the exchange and transmission of the information more. But,with the side effect,there are some despiteful individual organizations copying,tampering and broadcasting the copyright content,without admission of the work owner. Therefore, how to carry out copyright protection and ensure the security of the information has become one of the urgent problems to be solved in digital communication.This paper describes the concept,framework,the technique requirements and features,summarizes all kinds of existent audio watermarking algorithms,finally introduces the attacks and benchmarks of audio watermarking techniques.First, a new audio watermark algorithm based on stochastic resonance in the DWT and DCT domain is proposed in this paper. In embed-process, we embed the watermark sequence in the DWT and DCT domain coefficients of audio carriers. In decode-process, after the preprocessing of the audio to be decoded, the DWT and DCT domain coefficients are used as the input of the stochastic resonance system, by adjusting the parameter of the stochastic resonance processor and the deburring parameters which presented in this paper, the detection of watermark can be achieved. Simulation results show that it can resist most attacks in StirmarkForAudio with unperceived watermark, which shows the stronger robustness of the proposed approach than common algorithms.Secondly, a quick Re-synchronization algorithm in time domain is proposed in this paper. This algorithm makes use of the energy of three successive sampling points to embed watermark. In the watermark detection side, we make full use of the energy feature of watermark embedding points. And reach the compromise of the detection rate and detection accuracy by coarse synchronization and detailed synchronization, in order to located the synchronous code quickly and accurately. Simulation results show that it has good robustness and transparency, which can provide quick synchronization interface to classical algorithm.