理学 多媒体编码 释 pulse code modulation 脉冲编码调制 实现模拟信号数字化传输的编解码系统，是现代语音通信中数字化的重要编码方式。
网络与数据通信 有线网络 释文 pulse code modulation, PCM 脉冲编码调制
- official document to the lower level
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