This article has a review of the developments in modulation method,RF amplification system and in such multifunctions as SSB, floating carrier and AM multiplexing, in the recent 20 years at home and abroad.

• 文章回顾了20年来国内外调幅广播在调制制式、射频放大系统以及包括单边带、浮动载波和调幅多工等多种功能的发展状况。