医疗病房呼叫系统外文翻译文献

医疗病房呼叫系统外文翻译文献

(文档含中英文对照即英文原文和中文翻译) 原文：

Design Of Medical Ward Call System Based On Power Line Carrier Technology

I. INTRODUCTION

The medical ward call system is a kind of call tools when the patient needs access to care or diagnosis, patient's request can be quickly transmitted to doctors or nurses on duty. It is one of the necessary equipment to improve the level of hospital care. Currently, there are many medical ward call systems with different types and different function on the market, they are divided into two categories: the cable-type and wireless-type[1]. Traditional cable-type medical ward call systems tend to use a centralized call system structure, power lines, data communication

lines, voice communication lines transmit separated, has Line with the laying of more, high cost, installation difficulties, poor real-time, high failure rate and other shortcomings.Wireless-type medical ward call systems do not lay the line, but its reliability is poor, and radio waves can interfere with other medical instruments and equipment, most hospital do not use such wireless call system.

With the development of communication technology, people have done a lot of research work for power line carrie communication technology. Power line carrier communications technology refers to a means of communication which uses power lines to transfer data and media signal. It loads high-frequency contains information on current, then use current transmission,then use the adapter which receives information to separate high-frequency from the current, and transferred to a computer or telephone in order to achieve information transmission. Electricity supply network is the most popular network in the world, low voltage power lines connect to thousands of families, it can be used for data communication and information transmission without laying dedicated communication line and occupying the wireless channel resources[2]. Therefore, it has become possible that using low voltage power lines as the transmission medium, and using spread spectrum, digital encoding, single-chip control technology to achieve ward calls.

In this study, the power line carrier communication technology has been applied to ward call system. The entire system requires only a two-core shielded cable, through the power cord that the host provides to each extension realize two-way data communication.With low cost, simple installation, extensive transmission lines, etc, the hospital ward has a good application prospect in practice.

II. SYSTEM STRUCTURE AND WORKING PRINCIPLE The call system mainly consists of the host, extensions and power