基于dsp语音信号编解码器设计(2)

语音信号编解码器设计与简要分析

ABSTRACT

Abstract

DSP Processor is designed for real-time digital signal Process.With the great Progresses and a series of break-through in VLSI technologies，integrated DSPs process out soon after. Integrated DSPs Possess many advantages，such as compactness，low Power cost，and high working speed and so on which are mostly suitable in speech signal compressing. Present DSPs are getting more and more attentions in the information field，due to its Powerful signal Processing ability，becoming a hot-point technique in communication and other relating signal nrocessing areas.

With the rapid development of Multimedia communication technology and Internet technology, Application of Digital speech Coding is more widely in recent years. Digital speech Coding can reduce rate of bits ,for the purpose of provided more channels to transfer image、document、computer files and other Data stream, but the operation must assure quality of speech. So ITU introduce G.711, a voice compressing criterion, 64kbps rate speech Coding.The criterion have the advantages of high speech quality、low time delay and good stability，which can be applied in the area of digital speech communication and be worth researching highly.

First of all the development course and tendency of Speech Compress Coding has been introduced. On the basis of analysis and research to theory of G.711 criterion arithmetic，realization of the algorithm of speech coding’s system based on TMS320F2812 is narrated .Due to large operation when arithmetic is run in real-time，several methods of optimized codes was put forward .Loaded optimized codes in TMS320F2812 and simulated，the arithmetic’s performance was compared· Whole paper is made up of three chapters In the first chapter，summarizes the classification、standard and tendency of Speech coding ; in the second chapter，theories of G.711 criterion arithmetic are analyzed: design of hardware and software speech coding，system based on TMS320f2812;in the third chapter the results of the experiment are analyzed; in the last chapter ,the main conclusions of design are summarized.

Keywords: Speech Compress Coding,G.711criterion, TMS320F2812.