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介绍一种基于DTMF编码的电力线载波系统 ,该系统由双音频 (DTMF)编译码芯片HT92 0 0和MT8870、模拟乘法器MC1 4 96和电力线耦合器组成。通过对系统组成原理的介绍 ,详细论述了系统的设计过程以及为了保证其通信的可靠性而采取的抗干扰和软件纠错措施。试验证明 ,该系统充分发挥了DTMF的优良性 ,是一套低成本的电力线载波数据通信系统
A power line carrier system based on DTMF coding is introduced. The system consists of double tone (DTMF) codec HT92 0 0 and MT8870, analog multiplier MC1 4 96 and power line coupler. Through the introduction to the principle of system composition, the design process of the system and the anti-interference and software error correction measures taken to ensure the reliability of the communication system are discussed in detail. Tests show that the system gives full play to the superiority of DTMF, is a low-cost power line carrier data communication system