增量调制系统的间隙零码及其抑制方法  

The Gap Zero Code at Delta Modulation System and Its Suppression

作　　者：张学军[1] 

机构地区：[1]湖南城市学院物理与电子信息系,湖南益阳413000

出　　处：《鲁东大学学报（自然科学版）》2009年第2期141-143,共3页Journal of Ludong University:Natural Science Edition

基　　金：湖南省"十五规划"重点课题;湖南省教育厅资助项目(XJK06AZC010);湖南城市学院院重点资助课题

摘　　要：DM制CDA的间隙零码的有害影响是电源的功耗很大,从而降低了增量调制丁类放大器总的工作效率;为了消除间隙零码的有害影响,设计了一种间隙零码的抑制电路,采用由音频信号形成的开关信号去封闭编码器的三变量与门的办法既可以消除间隙零码的不良影响,还可以消除间隙噪声干扰,从而大大提高了CDA电路的性能.The gap zero code of CDA is a string intermittent and its harmful effect is that its high power consumption decrease the total operating efficience of increasing control Class D. A new method is introduced to eliminate the bad effect made by the gap zero code of CDA . A controlling circuit of gap zero code is designed. It is proved that using the switch signals formed by audio signals to control the three-variable of encoder and gate, can not only wipe out the bad effects of the gap zero code, but also eliminate the gap noise jamming, which can greatly enhance the CDA circuit performance.

关 键 词：增量调制 丁类放大器 间隙零码 次DM信号 复合DM信号 与门电路 

分 类 号：TN912.3[电子电信—通信与信息系统]