G.723.1 Standard On Tms320vc5402

Speech Communication is an important and indispensable service in different modern communication systems. With the increasing of network users > the integrating and diversifying of network service, the contradictions among bandwidth, system capacity and service quality are more and more obvious. How to reduce the bit-rate of speech without remarkably degrading its perceptual quality is a question placed at the front of the researchers. At the same time, the process of speech signal by digital is developed rapidly in information science. There are many ways been brought forward in voice compres^. ITU-T has also put forward a series of ones in low rate speech coder, including recommendation G.723.1.At first, from the discrete digital model of the speech generate, this paper briefly recount some basic terms and principles in low rate speech processing. Then focus on the research of the linear predictive coding, which is used widely (and is the base of G.723.1 too), and narrate in detail some key techniques in this area.During the concretely realize of the recommendation G.723.1, we set up the hardware elements of the speech coding, which is the TMS320C54xx DSP platform of TI Inc. We introduce it in this paper too., In the following we discuss the framework of the G.723.1 from the systematic view, and bring out a blue print of implementation this recommendation. Combined to my works, we even introduce the problems we met and the solutions we found.At last, considering the algorism is mended, some innovative improvement thoughts on further reducing the code-rate and decreasing the complexity of vocoders are included in this dissertation.