The Research Of Speech Enhancement Algorithm And Implementation Based On DSP

The primary purpose of speech enhancement is to purify it from noise.Because it is very complicated to grasp the random noise's cause or characters, it is impossible to eliminate the random noise completely. Actually, goals of speech enhancement are to improve the quality of speech, to eliminate the background noise so that every hearer is willing to hear and wouldn't feel weary, and to upgrade the quality of speech and understandable level.Most speech signal processing systems are real-time operated. At the same time, along with the development of speech processing technology, and the complicated algorithms, the real-time systems need higher speed to accomplish expected goals. And in recent years, the DSP (Digital Signal Processor) has been well developed which makes speech processing technology also develope fast. As a result, many excellent real-time processing algorithms are realized by high quality Digital Signal Processors.In this paper, firstly, all kinds of speech enhancements will be introduced, and several prevalent methods are compared and analyzed. Secondly, a speech enhancement arithmetic based on an adjustable step size LMS is put forward which will be carried out by DSP.And the principles of DSP are introduced, especially about TMS320VC5402.The author designed a speech enhancement system which is successful both in hardware and software designment. And this system can restrain noise from noisy speech effectively.