调幅(Amplitude Modulation,AM)广播指的是以幅度调制方式工作的无线广播,多用于中、短波广播.自广播诞生以来,调幅广播经历了近百年的发展史,为人类的广播通信事业做出了巨大贡献.调幅广播的发展史其实也是科技进步和广播设备更迭的发展史.对此,以调幅广播技术的演进历程为主线,剖析模拟调制技术和数字调制技术的工作原理并阐述调幅广播向数字化转型的关键技术.在此基础上,论述数字幅度调制(Digital Amplitude Modulation,DAM)发射机向DRM(Digital Radio Mondiale)发射机转换的应用实践.
Analysis and Application of Digital Technology of Amplitude Modulation Broadcast Transmitter
Amplitude Modulation (AM) broadcasting refers to radio broadcasting that operates in amplitude modulation mode,and is mostly used for medium and short wave broadcasting.Since the birth of broadcasting,AM broadcasting has experienced nearly a hundred years of development history,and has made great contributions to the broadcasting and communication cause of mankind.The history of AM broadcasting is also a history of technological progress and changes in broadcasting equipment.In this regard,this paper takes the evolution of AM broadcasting technology as the main line,analyzes the working principle of analog modulation technology and digital modulation technology,and expounds the key technologies of AM broadcasting's transformation to digital.On this basis,the application practice of Digital Amplitude Modulation (DAM) transmitter to DRM (Digital Radio Mondiale) transmitter is discussed.
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