HT9200A-B双音多频DTMF信号发生器，作者：QQ 64134703 ，欢迎咨询-HT9200A-B dual tone multi-frequency DTMF signal generator, the author: QQ 64134703, welcomed the Advisory

本设计是基于ARM7微处理器LPC2103为核心，利用双音多频(Dual Tone Multi Frequency，DTMF)信号进行电话按键号码识别。用户可通过电话通信实现对家庭相关电气设备状态的查询和控制，以及电话留言和对留言的提取-The design is based on microprocessor LPC2103 control of ARM7, use DTMF (Dual Tone Multi Frequency, DTMF) to identify the phone num

针对DTMF信号编码，进行的一个测试程序，测试电话的拨号程序-A test program for a DTMF signal encoding, conducted Test Phone Dialer