Implementation of Multi-band Excited Speech Coding

The sources in communication especially the frequency source become more and more valuable with the development of information society.Then more and more speech compress coding technologies being to decrease bit rate in transmission and data storage quantity when in memory.After many years rapidly development of speech compression technology,it becomes more and more important.Multi-band Excitation(MBE) codec is a better choice among the speech coding algorithms at low rate.It can synthesis better speech than the traditional codec at rate of 2.4～4.8Kb/s.Its synthetic speech sounds naturally and can endure more noise.MBE codec is taken as the mayor object of research.Detailed research has been done from the aspects of speech analysis and synthesis.In the meantime,the VAD algorithm is applied to the MBE code,in order to reduce the code rate.At last,based on simulations,aiming at MBE codec,improved arithmetic is put forward.