新的语音信号统一VBR编码方法

A New Consolidated Speech VBR Coding Method

本文提出一种两级语音信号编译码新方法 -EMSVBR系统 ,输入信号经语音活动性检测后 ,经两级编码器进行压缩 .其核心编码器基于混合编码技术 ,增强编码器基于小波分带的SBC技术 ,系统的码流是分层嵌入式的 ,系统码率变化既利用了语音的突发性 ,又可根据网络容量或信道特性变化而变化 ,涵盖了目前几乎所有语音编码标准的码率 ,并且新系统的解码语音质量 ,高于同样码率下的单一编码标准的质量 .这种语音VBR编译码方法 。

We present in this paper a new two level speech coding method EMSVBR system,which consists of two subsystems.The core subsystem is based on hybrid coding technique and the subordinate subsystem is based on SBC technique that utilizes wavelet packet to construct SBC filter banks.Bit streams from this EMSVBR codec are layered and its bit rate is variable in wide ranges with the available capacity of networks or with the change of channel characteristic.This new codec demonstrates better performances than other algorithms if they operate at the same rate and therefore is suitable to be used in the cases of VOIP and VOA.