一种带远距离控制功能的电话转拨器的设计

A Design of Phone Transfer Device with Remote Control

介绍了以LE78D11,LE77D11,CPC5620和ISD1420等芯片为基础设计的一种带远距离控制功能的电话转拨器。硬件方面,介绍了整体设计方案及各部分功能电路。软件方面,采用状态转移法编程,程序结构清晰。电话信号音采用软件算法识别技术,较之硬件识别更准确快速。该转拨器还具有基于公用电话网的多路家电遥控功能,利用电话机的DTM F信号远距离发送控制命令。最后给出了系统的软件流程。

A phone transfer device with remote control based on LE78D11, LE77D11,CPC5620 and ISD1420 chips are introduced. In the hardware design, the overall design of the system and some functional circuits are described. In the software design, the method of ＂state transfer＂ is adopted and the program structure is dear. The identification of the telephone signal is used in the software algorithm, and compared to the recognition method with hardware it＇s faster and more accurate. This device also has the function of remote control of home electric appliance based on PSTN, and can receive orders from DTMF. Finally, the software flow of the system is introduced.