Heart Sounds Digital Watermarking Processing Technology

Because of the rapid development of computer network technology, digital media products get much popularity, compared to the original analog media, digital media products have the advantages of fast spread through the network, easy storage, convenient editing and losses copy, but these advantages have brought illegal operation and piracy to the digital products and network application. The aim of watermarking digital product process for audio, video, digital image is to verify that the products is original and solving the problems such as ownership of the digital products, digital watermarking processing technology develops quickly, Audio watermarking research also has a degree of development, the rapid development of Internet has brought the illegal spread of audio file through the Internet, so the protection of the intellectual property rights for audio files can't allow delay.In the field of heart sounds signal processing, heart sounds database copyright protection is also important. As a special kind of audio signal, heart sounds signal watermarking processing technology has barely been studied at present. This paper first studies the characteristics of the heart sound signals and digital watermarking technology related theory, discusses the present situation of the study of audio watermarking processing and all kinds of audio watermarking processing characteristics, then combining the heart sound signals'own characteristics, three different kinds of heart sounds watermarking algorithm are chosen and compared in the original and improved algorithm respectively in this thesis. Through the embedded and extracted watermark signal transparency, robustness and concealment test, a quantitative and qualitative analysis and comparison for each result of different algorithms is conducted . The experiment results show that the improved ICA algorithm is more suitable for heart sounds signal processing algorithm of watermark, and can effectively realize heart sound watermark embedment and extract that the embedded watermark is better in concealment and strength and has more practical value.