Speech Secrecy Transmission Technology Research Based On Blind Source Separation

This paper introduces the research background and the current status of speech encryption transmission technology. Through the basic principle of blind source separation to explore the feasibility of speech encryption based on blind source separation and particularity, put forward an improved speech encryption algorithm, application of ICA, Fast ICA and PCA-ICA algorithm decryption.The content of this study is based on blind source separation of speech security transmission, based on the kroneckerproduct and matrix convolution theory, the structure of underdetermined mixing matrix to ensure that the speech signal encryption features. In blind source separation of speech security transmission system, mixed original speech signal and the key signal, by constructing the underdetermined encryption mixed matrix for encryption, the encrypted speech signal through the channel transmission to the receiver, using the ICA, Fast ICA and PCA-ICA algorithm decryption. At last, through the MATLAB simulation software for speech encryption and decryption process, and use the similarity coefficient and SNR evaluation of simulation result.