话音通信中的非连续传输技术  

Discontinuous Transmission in Speech Communication

作　　者：周德俊 

机构地区：[1]朗讯(中国)贝尔试验室,北京100080

出　　处：《通信技术》2001年第9期46-48,共3页Communications Technology

摘　　要：非连续传输技术(DTX)主要用在无线通信中,通过在无声期不传或少传语音参数来减少信道传输流量和同信道干扰,提高语音质量,增加系统容量。从系统的角度分析了DTX涉及到的话音活动检测和舒适音产生等技术,这种技术普遍适用于一类基于CELP的语音编解码算法。Discontinuous Transmission(DTX)is a technology mainly used in wirele ss speech commu-nication.By not transmitting or tra nsmitting just a small amount of nois e parameter bits during the silence periods of conversation,this techn ology can largely reduce the traffic s of the communication channel and the co -channel interference.This i n turn increases speech quality and c apacity of the mobile communica-tion system.From the systematic vie w,this paper analyzed the techniques,such as voice activity detection(VAD)and comfort noise generation(CNG),used in DTX.

关 键 词：话音通信 语音编码 非连续传输 

分 类 号：TN912.3[电子电信—通信与信息系统]