本设计采用AT89S52为控制核心，以DDS芯片AD9850产生频率可以自动可调的正弦扫频信号，实现了全频范围和特定范围内自动搜索和手动搜索，并且鉴别外来信号的调制方式：调频、调幅、等幅。通过单片机自动显示外来信号频率并存储，达到侦察接收机的性能要求。-AT89S52 the design for the control of the core, have a DDS chip AD9850 automatically adjustable frequency swept sine signal

调幅中波收音机的接收频率段为550KHz到1605KHz，中频为465KHz。调幅传输模型，对超外差式中波收音机建模-am medium wave radio frequencies to 550KHz receiver to 1605KHz, IF is 465KHz. am transmission model, modeling superheterodyne am radio

am超外差广播接收机system view 仿真-am superheterodyne radio receiver system view simulation

am超外差广播接收机system view 仿真-am superheterodyne radio receiver system view simulation