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介绍一种以A T89C51为核心,可通过电话遥控的多路智能控制器。该系统由硬件和软件两部分组成。通过对公用电话网用户线状态的检测,用计算机实现双音频拨号号码的识别,提出一种利用硬件和软件相结合完成检测的技术。硬件电路是以MT8870双音频解码器件为核心,完成对双音频信号的分离、滤波、检波和译码。实践表明这种方法直观、有效、可靠。文章对系统工作原理及信号变换过程等进行详细说明。
Introduce A T89C51 as the core, by telephone remote control multi-channel intelligent controller. The system consists of hardware and software components. Through the detection of PSTN subscriber line status, the recognition of dual tone dialing number is realized by computer, and a detection technique based on the combination of hardware and software is proposed. The hardware circuit is based on the MT8870 dual-audio decoding device to complete the separation, filtering, detection and decoding of the dual audio signals. Practice shows that this method is intuitive, effective and reliable. The article describes the system working principle and signal transformation process in detail.