Research Of Robust Digital Audio Watermarking Algorithm

With the continuous development of information society, copyright protection and identification has been an urgent need to be solved, and robust digital audio watermarking has become a field of copyright protection technology.Binary image which is as watermark information is embedded to the audio data, after analyzing of digital audio watermarking technique's status of international research, in order to improve the algorithm's robustness and imperceptibility, two kinds of digital audio watermarking algorithms are proposed.A mixed-domain robust audio watermarking algorithm which is based on LSB and quantitative idea is proposed. In the extraction process, there is no longer to need rely on any threshold. In order to enhance the robustness, error correction coding techniques are used. The experimental results show that the algorithm not only has strong robustness and good imperceptibility but also can resist all kinds of common attacks.The other approach is changing the three sections of the audio sample rate of the value to adjust the three sections of the audio energy in relativity to achieve a secret watermark embedding. In order to ensure the algorithm's security and robustness, firstly, using spread spectrum technology to a watermark signal; secondly, synchronization code and spread watermark are embedded into the audio signal of the fourth low-frequency coefficients of wavelet transform. In the extract process, through the decoding of the synchronization code to locate the position of the watermark signal embedded in the frame as well as data starting position. To further enhance the robustness, BCH error correction coding techniques, redundant embedding, and an array of recombinant techniques are used. The experimental results show that the algorithm is a common audio processing for the attack with good robustness, and the algorithm can resist a certain number of Digital-Analog/Analog-Digital (DA/AD) attacks.