In the past, the automatic charging device could not provide the function of communication, network management and automatic dialing.

Aiming at the function of auto-dial in designing telephone set, Single chip microcomputer is used in auto-recognizing audio signal of telephone The theory is put forward The interface circuit and the software are designed A good effect can be obtained The problem of realizing the function is solve

Realization of multi-temperature monitoring and automatically dialing voice alarm system;

This paper introduces the design of multi-temperature supervised and automatically dialing voice alarm system,and detailed clarifies the relevant work principle,the key technique and hardware designs.