The Design Of Audio Watermark System Based On Spread Spectrum

The rapid development of modern computer technology and the wide application of the Internet has greatly promoted the digital level, a variety of multimedia works can be stored in the computer or diffuse the whole world by network, which is very helpful to promote cultural exchanges.But the use and dissemination of these media may damage the copyright of the author. In order to solve this problem, digital watermarking technology came into being.Audio watermarking technology has gradually matured. Although there are many mature technology solutions. Most of them are carried out with the balance of different technical parameters.Firstly, this paper elaborates the audio digital image watermarking research background, significance and the situation at home and abroad. Then, it introduces the relevant technical overview of the audio watermarking, the basic knowledge of audio, masking effect, design of audio watermarking, evaluation standard,attack methods and testing process and so on. Then, the paper carries on the programming simulation on the MATLAB platform, which is based on the DWT watermarking algorithm, zero watermarking algorithm and DCT watermarking algorithm, followed by the performance and main characters of the algorithm.In addition, this paper tested the impact of audio signal in the air channel transmission, then designed the audio watermarking algorithm based on spread spectrum and Tested the performance of the algorithm.At last, this paper uses Windows SDK programming technology to design the watermark detection system, which based on Visual Studio platform. Through the comprehensive consideration of the performance of algorithms, such as the perceptual transparency, robustness and complexity of the algorithm, we choose the watermarking algorithm based on spread spectrum to design the system. The watermark system designed in this paper can embed the watermark in a plurality of locations of the audio signal at the transmitter, and realize the real-time acquisition and real-time processing of the audio data in the receiving end. After the test, the watermark system can detect the watermark in real time and meet the design requirements.