摘要
讨论模数转换和压缩编码的一种重要方法-自适应增量调制(ADM)的性能。先对DM技术进行了研究,由于DM存在一些不足,在DM技术的基础上又引入了ADM技术。建立ADM系统的模型,采用后向反馈自适应算法-步长的自适应调整基于信源信号波形的量化样值的幅度。使用MATLAB仿真实现并根据仿真结果分析其性能。提出ADM能够自动跟踪快速变化的信号波形,比DM具有更良好的SNR性能和更大的动态范围,在很低的速率上就能给出高的编码质量,如32kbit/s甚至是16kbit/s。从而节省了带宽。
An important method of analog/digital conversion and compression code which is called adaptive delta modulation (ADM)is discussed.The method called delta modulation (DM) and the ADM for overcoming some disadvantages of the DM are presented.The models of the ADM system is set up through the backward feedback algorithm.The performance of the ADM is and pyzed according to the result of the realization.This scheme can follow signal when it changes too rapidly.And it has better SNR performance and wider dynamic range than delta modulation (DM).ADM can therefore operate at much lower bit rates than DM,typically 32 kbit/s and exceptionally 16 kbit/s,then save the bandwidth.
出处
《计算机测量与控制》
CSCD
2003年第12期997-1000,共4页
Computer Measurement &Control
基金
云南省自然科学基金项目(FOO40M)
关键词
自适应增量调制
仿真
性能分析
信号波形
数字语音编码算法
delta modulation (DM)
adaptive delta modulation (ADM)
analog/digital conversion (A/D)
compression code
prediction code
wave code
continuously variable slope delta modulation (CVSD)
