Enhancement of Voice Quality and Bit-rate Reduction by Prosodic Control in G.723.1 Vocoder  

作　　者：Jong-kuk KIM 

机构地区：[1]Dept.of Information and Telecommunication,Soongsil University,Seoul 156-743,Korea

出　　处：《Journal of Measurement Science and Instrumentation》2011年第2期179-183,共5页测试科学与仪器（英文版）

基　　金：supported by the Brain Korea 21 Project in 2010,and the MKE(The Ministry of Knowledge Economy,Korea);the ITRC(Information Technology Research Center)support program(NIPA-2010-(C1090-1021-0010))

摘　　要：Speech coding techniques have been studied not truly to reduce the complexity and bit rate but also to improve the sound quality. CELP type vocoder, used as standard, supports the great stead quality even low bit rate. In this paper, the preprocessing of input speech to reduce the bit rate is different from the conventional vocoder. Different kinds of parameter are used for the preprocessing compared with the other parameters to t＇md the more appropriate parameter for the vocoder. The Parameters are used to synthesize the speech not to encode or decode for coding technique so we proposed the simple algorithm not to have the influence on the processing time or the computation time. The parameters in the preprocessing step are speaking rate, duration, and PSOLA technique.

关 键 词：CELPocoder bit rate PSOLA technique prosodic 

分 类 号：TN919.81[电子电信—通信与信息系统]