half: n.(pl. halves )1.半，一半；一部分。2.半小时;半英里;半品脱;半价票;〔美国〕半美元;半学年，一学期。3.(球赛的)半场，半局，半盘，半回合。4.(足球)中卫(＝ halfback); (运动中的)配手，合作者。5.(高尔夫球赛等)相同得分。6.(尤指打官司的)一方。短语和例子half past four ＝ 〔美国〕 half after four 四点
The main advantage of this pdm converter is that one half - cycle of the high - frequency voltage becomes the basic unit of synthesis of the low - frequency signals . the area difference under the reference signal and synthesized signal and the next pulse with the polarity will reduce thi s difference Pdm技术的特点是将高频交流脉冲信号的一个半周期作为合成低频信号的基本单元，通过比较同时刻参考波形和输出波形的面积差，使得两个曲线包围的面积可以基本维持平衡。
