计算机实现双音频拨号号码识别

The Realization for DTMF Phone-number Identification by Computer

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 ,提出了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 ,实验表明这种方法直观、有效、可靠。文章对系统工作原理及信号变换过程进行详细说明。

By detecting the status of the user line of PSTN , we have implemented the identification of DTMF dialing numbers by the use of PCS . Meanwhile , we propose the technique that combines hardware and software to fulfill the number detecting . The hardware circuit is made up of the the core of audio decoding device MT8870 , which realizes the separation , filtering ,detection and deco ding to the DTMF signals .The related experiments show that this method is visual, effective and reliable. This paper gives a detailed description of the working principle and the signal converting process of the system .