语音编码技术及其实验研究

Study of Speech Encoding Technology and its Experiment

主要讨论了三种语音编码方案 ,即线性脉冲编码调制 ( PCM,Pulse Code Modulation)、A律 PCM和连续可变斜率增量调制 ( CVSD,Continuous Variable Slope Delta Modulation)。在此基础上设计了蓝牙语音编码实验 ,涵盖了脉冲编码调制的抽样、量化和编码整个过程。以突发错误对语音编码实验的影响为例 ,分析和比较了这三种语音编码方式所受到的影响。仿真结果表明 CVSD的语音通信抗干扰能力较强 ,是目前语音编码当中最优的编码方案。

Three kinds of speech encoding schemes, namely, Pulse Code Modulation, A law PCM and Continuous Variable Slope Delta Modulation, are discussed mainly. Based on them, a speech encoding experiment used by bluetooth is designed, and it covers the total process of PCM from sampling, quantization and encoding. As an example of burst errors which affect speech encoding experiment, effects on these three speech encoding methods are analyzed and compared. The simulation results indicate that CVSD has a stronger anti interference ability of speech communication, and it is an optimum scheme of speech encoding at present. The content of experiment designed helps students to understand and master the speech encoding technology better.