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

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.