With the computer technology and information technology, voice interaction has become a necessary means to human-computer interaction, and audio signal acquisition and processing is the prerequisite and basis for human-computer interaction, computer sound card is an important voice signal processing components, it with the voice signal filtering, amplification, sample and hold, A / D and D / A conversion and other functions, although the entertainment in the Windows accessories with a tape recorder, through which voice signals can drive the sound card collection and save it as voice documents. However, to further analysis of the collected signal processing to be another program or through other software, and accessories in the Windows Sound Recorder feature is extremely limited and can not be extended. Matlab is the United States launched a Math Works for engineering and scientific computing, interactive computing software, it is based matrix operations, the visual computing, programming integrated into an easy to use, interactive work environment. In the MATLAB environment, driven by a variety of audio programming to realize the voice signal acquisition and playback. Same time, because MATLAB is a data analysis and processing is very powerful and practical software engineering, signal processing and analysis of its toolkit for speech signal analysis function provides a very rich function and using these features and convenient functions can be quickly completed the speech signal processing and analysis and visualization of signals, make machine interaction more convenient. 看看对不对