摘要
MF200多频中波发射机需要在短时间内自动、高效、精准可靠地从一个频率自动切换到预设好的其他播出频率,其中包括对发射机输出匹配网络的调整、载波频率的设置检测、播出音周以及驻波比检测参数的切换等。介绍了多频播出切换的控制原理和实现过程,设计了一种基于嵌入式系统的多串口RS422总线通信、多线程以及单片机技术的多频切换控制系统,实现了对多频中波发射机频率切换进行分时处理,同步监测。
MF200 multi-frequency medium wave transmitter needs to switch automatically,efficiently,accurately and reliably from one frequency to other preset broadcasting frequencies in a short time,The whole process includes adjusting the output matching network of transmitter,setting parameters of carrier frequency,audio program and standing wave ratio detection,etc.This paper introduces the control principle and implementation process of multi-frequency broadcasting switching.A multi-frequency switching control system based on multi-serial RS422 bus communication,multi-threading and single chip technology has been designed.The time-sharing processing and synchronous monitoring for frequency switching of multi-frequency medium wave transmitter has also been achieved.
作者
万运强
WAN Yun-qiang(State Administration of Press,Publication,Radio,Film and Television of The People’s Republic of China,561 Station,Nanchang,Jiangxi,330046,China)
出处
《中国传媒大学学报（自然科学版）》
2019年第S01期82-85,共4页
Journal of Communication University of China：Science and Technology
