| With the rapid development of technology and information, an electronic device that widely used in many hospitals for the system of medical call, become more and more popular and valuble.The system should consider both vauble and decorative as well as the whole design of the hospital requirements. It is building a information channel that could connect with both patients and health care workers, so it may be very benifital for patients to have the effective treatments in a short time.This paper introduces a local paging intercom system used in hospitals which use the microcontroller (ATMEL / PIC series) for its control. The system considered the requirements of hospitals, so combine both communication and audio technology in it. It concludes some sections such as main engine, extension set, corridor display and a system based on the ACCESS database. However, the most important part is the design and the implement of the hardware. The paper used the two-wire topology system, so both the controlled and full-duplex voice signals can be transmit by in two-electric power lines. And for the design of the interface circuits is suitble, the main engine can provide the power for each extension sets and corridor display at the same time. So the system can become very simple. And this construction not only could save resources but also can improve the efficiency for the system to install. The management system for patients to call not only can improve efficency of control but also allow doctors to grasp patients'basic informations at the first time, when after embedded database in the delphi tools.Until now, the debugging work for the hardware circuits have been completed, and the whole system devices can also reach the expected goals and requirements. |
