摘要
简述了准瞬时压扩技术的特点及原理,介绍了该技术在数字式广播、电话复用机中的实现方案——线性编码加数字式比特压扩,并给出了两路广播分时公用一套12～9四范围比特压扩的框图及部分具体电路.实验结果表明,方案简单易行,性能良好。
Presents the features and priciple of the quasi - instantaneous companding technique . Implementation of the technique in a digital multiplexer for both broadcasting and telephone channels , accomplished with linear coding and the digital bit companding method is discussed. The block diagram and part of the circuits of a 12 - 9 bit companding program for a two -channel time sharing broadcast system are given.Experimental results show that the system is simple and practical, offering a satisfactory performance .
出处
《北京理工大学学报》
EI
CAS
CSCD
1991年第2期67-73,共7页
Transactions of Beijing Institute of Technology
关键词
准瞬时压扩
PCM编码
瞬时压扩
pulse code modulation (PCM)/ instantaneous companding
quasi - instantaneous companding
digital bit companding
compression coding
expanding decoding
