无线话筒装置设计

Design of Wireless Microphone System

无线话筒因其结构简单、使用方便,得到了广泛的应用,为了进一步提高无线通话质量,文章设计了一款改进的无线话筒装置。该装置由信息发射系统和信息接收系统组成,发射系统采用了调频调制方式,提高了通信频道带宽和动态范围,拓展了通信距离。发送系统首先将声音信号变为低频电信号,然后通过高频振荡器调制,功率放大,最后经过天线辐射出去;接收部分首先由天线接收信号,再进行解调,并功率放大,最后由扬声器输出。系统在距离100m时可清晰通话,具有较好的性能。整个设计将高频原理的理论知识与Protel99se PCB设计软件有机结合,做到了理论知识与动手能力的完美结合。

With its simple structure and convenience, wireless microphone has been widely used, in order to further improve the quality of wireless calls; this paper designed an improved wireless microphone device. The device is composed of information sending system and receiving system, and sending system adopts the FM modulation to improve the communication channel bandwidth and dynamic range, expand the communication distance. Sending system firstly change person sound signal into a low frequency signal, which then modulated by high frequency oscillator and power amplifier, finally launchedby the antenna; Receiving part firstly catches thesignal by antenna, then carries on the demodulation, and power amplification, finally output by the speaker. The phone has excellent calling when the distance is 100 m, which has a good performance. The design combines theory knowledge ofhigh frequency electronic circuit with Protel99 se PCB design software, which achieves the perfect combination of the theoretical knowledge and practical ability.