PCM 中文称脉码调制，由A.里弗斯于1937年提出的，这一概念为数字通信奠定了基础，60年代它开始

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中文称脉码调制，由A.里弗斯于1937年提出的，这一概念为数字通信奠定了基础，60年代它开始应用于市内电话网以扩充容量，使已有音频电缆的大部分芯线的传输容量扩大24～48倍。到70年代中、末期，各国相继把脉码调制成功地应用于同轴电缆通信、微

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