基于增量调制的CMX639及其应用  

CMX639 based on continuously variable slope delta modulation and its application

作　　者：孙继平[1] 吴冰[1] 

机构地区：[1]中国矿业大学(北京校区)信息工程研究所,北京100083

出　　处：《辽宁工程技术大学学报（自然科学版）》2003年第5期667-669,共3页Journal of Liaoning Technical University (Natural Science)

摘　　要：CMX639是一种单片全双工增量调制解调器(CVSD)芯片,它将输入、输出滤波器,编、解码器,时钟发生器和逻辑控制电路集成在一起。该芯片用线性双极性与集成注入逻辑兼容的集成电路制造工艺制成,采用从积分增量调制技术,具有四种可编程工作模式,两种可选择压扩算法,从而使电路设计大为简化,电路的工作可靠性、稳定性显著提高,成本大为降低。可在用户线电路,手机,多路传输系统及保密电路中应用。The CMX639 is a continuously variable slope delta modulation (CVSD) full duplex coder for use in consumer and commercial digital voice communication systems.With its robust and selection coding algorithm due to,low cost ,very low power,and small size.the CMX639 is ideal for use in a wide variety of consumer and business digital voice application.Its completely integrated CODEC simples design and reduces the costs, complexity and rist of external filters and software algorithm.8kbps to 128kbps data/sampling clock rates are supported both via external clock signals or internally generated, programmable clocks. Internal data/sampling clock are derived from an on-chip reference oscillator that uses an external clock crystal. Because CMX639 has many advantagedous characteristic, it is used in consumer & business handheld devices, digital voice appliances, time domain scramblers, multiplexers and switches. The construction of circuit become simple. The stability and solidity rise greatly, and the cost is obviously reduced.

关 键 词：CMX639 全双工增量调制解调器 增量调制 滤波器 编码器 解码器 时钟发生器 逻辑控制电路 

分 类 号：TN915.05[电子电信—通信与信息系统]