ＰＣＭ中的Ａ／Ｄ和Ｄ／Ａ转换罗文博通信数字化是通信现代化的一个重要标志。随着数字程控交换机、光端机等的大量使用，ＰＣＭ设备作为模拟信号与数字信号互相转换的接口随处可见。它们是怎样完成模数转换的呢？ＰＣＭ通信即利用脉冲编码调制方法进行的信息交换。其基本... A / D and D / A Conversion in PCM Luo Wenbo Communication Digitalization is an important symbol of the modernization of communications. With the extensive use of digital program-controlled switches and optical transceivers, PCM devices can interface with each other as analog signals and digital signals. How do they accomplish analog to digital conversion? PCM communication is the use of pulse code modulation method of information exchange. Its basic ...