基于電力線載波技術(shù)的醫(yī)療病房呼叫系統(tǒng)的設(shè)計外文翻譯-其他專業(yè)(已修改)
2025-02-04 08:53 本頁面
【正文】 中文 3100 字 外文資料原文 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, patient39。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 cabletype and wirelesstype[1]. Traditional cabletype medical ward call systems tend to use a centralized call system structure, power lines, data munication lines, voice munication lines transmit separated, has Line with the laying of more, high cost, installation difficulties, poor realtime, high failure rate and other 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 munication technology, people have done a lot of research work for power line carrie munication technology. Power line carrier munications technology refers to a means of munication which uses power lines to transfer data and media signal. It loads highfrequency contains information on current, then use current transmission,then use the adapter which receives information to separate highfrequency from the current, and transferred to a puter or telephone in order to achieve information transmission. Electricity supply work is the most popular work in the world, low voltage power lines connect to thousands of families, it can be used for data munication and information transmission without laying dedicated munication line and occupying the wireless channel resources[2]. Therefore, it has bee possible that using low voltage power lines as the transmission medium, and using spread spectrum, digital encoding, singlechip control technology to achieve ward calls. In this study, the power line carrier munication technology has been applied to ward call system. The entire system requires only a twocore shielded cable, through the power cord that the host provides to each extension realize twoway data 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 line carrier circuits, the host is installed on the ward nurse duty room, extensions were installed in the ward, a host can control multiple extensions，一 220V civil power lines is as a transmission channel, in order to achieve two way munication between the host and the extension. The structure of system is shown in Fig. 1. The system uses a centralized power supply, supplies work power to ward extension through the twocore cable by the municating hosts. The signal of the host to each extension through the power line carrier circuit, after 一 220 V mercial power line transmission, achieves the half duplex data munication between the host and the e
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