无线呼叫系统是通过调频呼叫器或调幅呼叫器，对外发出数字信号的系统，可以实现无线呼叫到各个方位，如无线门铃、手机等。
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。
The design of the wireless unit to call the main system is divided into two parts, transmitting and receiving.
该合同要求该系统集成商提供服务器，存储器，网络，无线，统一通信和呼叫中心援助等服务。
The contract calls for the systems integrator to provide servers, storage, networking, wireless, unified communications, and call center assistance.
基于单片机的单工无线呼叫及数据传送系统的设计。
Design of simplex wireless call and data transmIt 'system based on MCU.
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