说明：  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 number. Users can query and setup the status of family equipments by telephone communication, also they can leave telephone message and extract message.)