An improved algorithm based on G.729 speech coding;

Simulation of the FS-1016 speech coding algorithm;

Efficient LSP quantization algorithm for very low bit rate speech coding;

G.729 Speech Code Research Based on DSP;

Full specification of the speech codes used in the TETRA (Trans-European Truncked Radio) system is presented.

This thesis realized and described speech code based on the issue of ITU-T pronunciation code standard G723.

This paper expounds the voice coding technology and its development, and particularly discusses the two most popular fields of voice coding—LPC and SBC.

729(8kbit/s)are the low bit rate of voice coding standard provided by ITU-T, which can be used for network ,wireless and satellite communication.

Intercommunication(including voice and data) between the virtual simulation radio and multi-type semi-simulation radio was materialized systematically,mainly depending on voice coding,real-time de-noising,formats reciprocating and so on.

The application of neural network vector quantization in speech encoding is discussed.

Three kinds of speech encoding schemes, namely, Pulse Code Modulation, A law PCM and Continuous Variable Slope Delta Modulation, are discussed mainly.

In the past 50 years, speech encoding technology has been made quite great progress.