1、 摘要摘要 临床呼叫求助装置是传送临床信息的重要手段，关系病员安危，传统的有线 呼叫系统历来受到各大医院的普遍重视。如果采用无线传输，会节约布线和改造 线路的资金，为医院节约成本，并且及时、准确、可靠，简便可行。本设计是一 种病房无线呼叫系统，采用无线编解码传输方式,避免了传统的有线呼叫系统布 线麻烦和改建麻烦的问题。 所设计的病区无线呼叫系统主要分为发射和接收两大 部分。其中系统有多个呼叫通道，可供多个床位或病房使用，以数据编解码芯片 PT2262 和 PT2272 为核心，采用无线收发模块进行传输，其模块工作频率为 315MHZ，接受方式为超再生，在护士站由 LED 数码管显示呼叫者的编号
2、，并有声 音提示。其中利用 NE555 构成单稳态触发电路控制数码管显示和声音提示的时 间，护士还可以通过确认按纽立即停止显示和提示，对于加强护士站与病房的联 系，提高护理水平有很大帮助。本次设计完成了各项指标，而且在要求传输距离 20 米的基础上，实现了 40 米的传输，接收端反应灵敏稳定。 关键词：无线；编码；解码关键词：无线；编码；解码 ；数码管；编码译码器；数码管；编码译码器； Abstract Design of this area is a wireless call system that uses wireless transmission codec, to avoid th
3、e traditional cable system, call routing and trouble into trouble. The design of the wireless unit to call the main system is divided into two 1arts, transmitting and receiving. Of which there are four call-channel system for the four ward beds or use the data to codec chi1 PT2262 and PT2272 at the
4、core, used to send and receive wireless transmission module, the module o1erates at 315MHZ, as a way to acce1t Chao Zaisheng, nurses By the LED digital dis1lay of caller ID, and voice 1rom1ts. NE555 use of which constitutes a single steady-state control circuit to trigger a digital dis1lay and voice 1rom1ts the time, nurses can also confirm button and 1rom1ted an immediate end to show that is intended to enhance the nurses station wards with ties to raise the level of care has been ins1ired
