摘要
增量调制(DM或ΔM)是继PCM后出现的一种模数转换和语音压缩编码的重要方法,可看作是DPCM的特例。围绕增量调制的发展,层层递进,说明DM、ADM、CVSD三种典型技术的编译码原理及性能。用Matlab软件进行仿真并对结果进行分析。结果表明,ADM能够减小量化噪声和失真,增大输入信号的动态范围。CVSD继承前两者的优点,可靠性更高,降低带宽的同时保证了语音质量,因此应用更加广泛。
Delta modulation（ DM or ΔM） is an important method of analog / digital conversion and speech compression coding after PCM,and it can be regarded as a special case of DPCM. In this paper,we elaborated on the coding / decoding principles and the performance of DM,ADM and CVSD. Simulation was carried out with Matlab,and the results showed that ADM can reduce the quantization noise and distortion,and can increase the dynamic range of input signal; CVSD incorporates the advantages of DM and ADM,and guarantees the voice quality while saving bandwidth,thus having wider application.
出处
《现代机械》
2016年第4期83-87,共5页
Modern Machinery
关键词
增量调制
自适应增量调制
连续可变斜率增量调制
模数转换
语音压缩
仿真
delta modulation（DM）
adaptive delta modulation（ADM）
continuously variable slope delta modulation（CVSD）
analog/digital conversion（A/D）
speech compression
simulation
