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文章介绍了以便携式微机为控制核心，采用数字编码、双音多频信号编码和锁相环调制解调等先进技术，利用电力线载波实现数据传输的微机自动抄表系统的组成及其各部分的工作原理
This paper introduces the composition and parts of microcomputer automatic meter reading system using portable computer as control core, digital coding, dual-tone multi-frequency signal coding and phase-locked loop modulation and demodulation and other advanced technologies. working principle