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

基于单片机,使用模拟调频技术,设计了一种单工无线呼叫数据传送系统,在30～40 MHz频段上,实现了话筒输入和线路输入语音信号的小功率远距离单工发送和接收．其数据通信采用FSK调制方式,主、从机可实现智能控制通信,可连接多达256个从站,构成一点对多点的单工无线呼叫系统．本系统可实现无失真的语音传输,且具有数据传输误码率低的特点,从站号码可任意改变,主站可拨号选呼和对全部从站群呼,在语音通信同时可传送信息数据,能使用液晶显示器显示英文和汉字短信及站号信息．

Based on MCU, a simplex wireless call and data transmit system is designed by analog frequency modulation technique. In the frequency interval of 30 -40 MHz, the transmittal of long distance and simplex by small power that voice signals are inputted through microphone and line is realized. The host and subordinate machines can undertake smart communication by frequency shift keying （FSK）modulation mode. There are 256 subordinate stations in our architecture, forming a one-to-multiple point, simplex, wireless call system. There is no obvious distortion and low bit error rate during transmittal. The number of subordinate stations can optionally change, while the host station can selectively or wholly dial-up. Data transmits while voice signals communication in this system, The English words,Chinese characters, short messages and station number will be displayed on liquid crystal display（LCD）.