摘 要： 介紹了HSP50214B數字下變頻" title="下變頻">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器" title="下變頻器">下變頻器的工作原理、功能和結構，在此基礎上設計了一種數字解調模塊，并就HSP50214B在其中的應用和配置作了詳細的分析，最后給出了該數字解調模塊在數字監測接收系統中的應用。實驗證明，該模塊在無線電接收系統中有著很強的實用性。
關鍵詞： 解調 數字下變頻 HSP50214B
在數字式接收系統中，A/D轉換器的采樣頻率" title="采樣頻率">采樣頻率一般都在中頻以上，因此采樣速率較高。在此采樣頻率上，僅僅靠 DSP難以完成實時接收、存儲、解調與分離等任務。當前廣泛采用的方法是直接使用硬件完成數字下變頻，即用數字下變頻器將高速數據流變成當前DSP可實時處理的中低速數據流?；谶@種思想，設計了一種基于下變頻器的數字解調模塊。該模塊采用數字下變頻器HSP50214B進行下變頻，經過抽取、濾波、降低數據率，將下變頻后的數據送至TMS320C5409 DSP，完成數字解調功能。此方案結構簡單、處理方式靈活，非常適用于載波頻率、符號速率和調制樣式可變的無線電接收系統。
1 HSP50214B簡介
1.1 HSP50214B的功能描述
HSP50214B是Harris(1999年8月后更名為Intersil)公司推出的成熟和典型的數字下變頻器，能將中頻采樣信號轉換為基帶采樣信號，其功能包括：頻率變換、抽取、濾波整形。其中，頻率變換功能由正交混頻器完成，抽取和濾波功能則由CIC抽取濾波器" title="抽取濾波器">抽取濾波器、HB抽取濾波器、255階FIR抽取濾波器、HB內插(Interpolation)濾波器等級聯" title="級聯">級聯完成。除了上述功能外，HSO50214B還能完成自動增益控制、片內和片間的同步控制、載波和碼元跟蹤以及部分常規信號的解調等功能。該芯片可以直接和DSP相連，傳遞控制信號、狀態信息及基帶數據。
1.2 HSP50214B的結構與原理
HSP50214B由同步電路、輸入模塊、輸入電平檢測、變頻模塊(正交混頻與數控振蕩器)、CIC(Cascaded Integrator Comb)抽取濾波器、HB(Half Band)抽取濾波器、255階可編程FIR濾波器、自動增益控制器(AGC)、重采樣與HB內插濾波器、定時數控振蕩器、笛卡兒坐標與極坐標變換器、鑒頻(幅)模塊和輸出模塊等十三個功能模塊組成，功能框圖如圖1所示。
量化后的數字中頻信號進入下變頻器后，經過兩個乘法器和復正弦信號產生器產生的正交正弦信號相乘。相乘結果作為I、Q兩路信號，此時采樣頻率fs并沒有發生改變。兩路信號分別經一組級聯的低通濾波器濾波并完成抽取后變為基帶信號，這就是下變頻抽取過程。此時，信號采樣率變為fs/M，其中M為級聯的抽取因子。整個下變頻器的核心部件為級聯的抽取濾波器，在HSP50214B中它是可編程的。
1.3 HSP50214B的主要特性
HSP50214B具有14位的輸入分辨率和16位的輸出分辨率，前端處理速度CLKIN達到65MS/s，后端處理速度PROCLK達到55MS/s；32位的可編程載頻數控振蕩器可用于信道分選、載波跟蹤及符號跟蹤；總抽取率達4～16384，由于有了重采樣級，抽取因子可以是非整數；輸出低通帶寬982kHz時，輸出采樣率可達12.94MＳ/s；具有串行、并行和FIFO等多種16位輸出模式；笛卡兒坐標(I、Q)到極坐標(
，arctan(Q/I))變換和鑒頻(幅)等可用于AM、CW、FM、SSB、FSK、PSK等信號的解調。
2 基于HSP50214B的數字解調模塊的設計
2.1 數字解調模塊的原理框圖及工作原理
數字解調模塊原理框圖如圖2所示。該模塊采用TI公司的TMS320C5409 DSP芯片作為處理器，充分利用HSP50214B的靈活配置功能，結合外圍電路構成DSP應用系統。
模擬中頻信號經A/D轉換器采樣(采樣頻率可編程，最高采樣速率達65MHz，12bit)后送入HSP50214B進行混頻、濾波、抽取整形等處理。對于AM、CW、FM信號，可以直接通過HSP50214B片內鑒幅、鑒相模塊進行解調，再通過串口輸出至D/A轉換器，得到語音輸出；對于其他調制信號，如SSB、FSK、PSK、QPSK等，HSP50214B將下變頻后的I、Q基帶信號通過并口送入BI-FIFO(2KB)，然后DSP通過FIFO中斷方式將數據從BI-FIFO讀入，進行解調處理。數字解調模塊通過PCI總線與主機進行通信，傳輸解調結果和控制命令等。
2.2 HSP50214B的接口設計及配置
HSP50214B共有256個32位的寄存器。DSP通過HSP50214B的微處理器接口(u口)對內部寄存器參數進行設置。HSP50214B與TMS320C5409 DSP的接口電路如圖3所示。
DSP采用間接尋址的方式通過數據總線C[7:0]，設置HSP50214B的256個寄存器參數。在寫入過程中，寄存器的參數為32位，而數據總線只有8位，在寫入32位數據時，需將數據通過C[7:0] ，按照字節的高低順序，分四次寫入到四個8位保持寄存器中。在進行寄存器參數設置時，不但要給定參數還要指定寄存器地址(1～256)，該地址緊跟著參數被寫入到一個8位的寄存器中。A[2:0]決定數據總線C[7:0]數據寫入的地址(000－保持寄存器1，001－保持寄存器2，010－保持寄存器3，011－保持寄存器4，100－地址寄存器)。
在寫入寄存器地址時，觸發電路產生脈沖和同步時鐘來裝載寄存器的參數。圖4給出了裝載寄存器數據的時序。C[7:0]中的數據和A[2:0]中映射的地址在
的上升沿寫入PDC，并且鎖存至寄存器中，此時A[2:0] =100。值得注意的是，在寫完一個控制字后，必須等待四個處理時鐘才可以寫下一個控制字，以保證上一個控制字的正確傳輸。
該數字解調模塊可以對不同中頻輸出信號在接收前端實現解調分析功能。應用中可根據實際的需求，設置各寄存器的參數，包括CIC、AGC、串并口、輸出格式、濾波器的系數等。模塊上電時，DSP在進行初始化的過程中將各寄存器的參數設置到HSP50214B的目的寄存器中。該數字解調模塊可以實現前端高速采樣、靈活的下變頻設置和DSP的軟解調功能，可以對不同調制方式實現靈活解調分析，具有適應性強、軟件升級方便等特點。
由于HSP50214B配置的靈活性和DSP良好的可編程性，該解調模塊可以通過編程實現各種調制信號的解調分析，實驗驗證了該模塊可以適用于不同的無線接收系統。
3 數字解調模塊在數字監測接收系統中的應用
數字監測接收系統主要完成指定波段內廣播信號和電臺信號的快速搜索和監測功能，以便及時發現非法廣播信號和電臺信號，為實施干擾提供情報支援。
系統主要由接收天線、寬帶射頻接收、寬帶數據采集卡、窄帶射頻接收、窄帶解調處理和PC終端處理顯示等六部分組成。寬帶射頻接收部分通過對指定波段的掃描，實現全景接收；窄帶射頻接收部分和窄帶解調處理部分根據終端下達的指令，完成指定頻點的監測分析和解調功能；PC終端處理顯示部分完成數據的終端處理、顯示和存儲管理等。寬帶射頻接收模塊輸出10.7MHz的中頻信號，瞬時帶寬1MHz；窄帶射頻接收模塊輸出1.4MHz的中頻信號。窄帶解調處理模塊是文中所述的基于HSP50214B和TMS320C5409 DSP的解調模塊，在窄帶分析處理中承擔著數字下變頻和完成解調功能的任務。系統功能組成框圖如圖5所示。
解調處理模塊對窄帶接收的中頻信號進行采集處理，并將解調分析后的數據通過PCI總線傳送至PC終端進行顯示、管理(頻譜、調制樣式、帶寬、調制度、電平等)。對于AM、CW、FM信號，可通過其串口輸出解調后的話音信息。
現以在短波波段接收的調幅信號分析為例，給出解調模塊中HSP50214B的配置和解調分析結果。
HSP50214B配置的主要參數：采樣頻率為64MHz/16＝4MHz，載波數控振蕩器N=(1.4/4)×232、相位偏移＝ 0，CIC抽取因子D=16、Gain=5，半帶濾波HB1和HB3打開、抽取因子為2×2＝4，FIR抽頭數為50，低通濾波帶寬為8kHz，抽取因子為1，插值半帶濾波旁通。輸出的速率為4MHz/16/4=62.5kHz。串口輸出信號的幅度，D/A轉換后輸出語音信號；并口輸出下變頻后的I、Q兩路數據至DSP進行頻譜分析并將結果向上傳送。圖6所示為一個AM信號分析結果，包括調幅度、帶寬、調制樣式、頻譜瀑布圖顯示等。
數字下變頻器在數字信號處理中有著重要的地位，它在軟件無線電、蜂窩基站以及CDMA中應用廣泛。HSP50214B提供了靈活的可編程特性，利用它可以方便地設計出能夠實時處理多種通信信號的接收機。本文設計的基于HSP50214B的數字解調模塊正是利用此特性，配合DSP，可以靈活解調各種調制方式的通信信號，適用性強。可以預見，隨著軟件無線電和各種用途的電子信息接收系統的發展，其應用前景非常廣闊。
參考文獻
1 HSP50214B Data Sheet [Z](File Number 4450.3).Harris公司，May 2000
2 Calculating Maximum Processing Rates of the PDC(HSP50214，HSP50214A，HSP50214B)[Z].Application Note(AN9720.2). Harris公司，January 1999
3 鄒理和. 數字信號處理 [M].北京：國防工業出版社，1985
4 趙義正. HSP50214B在數字解調系統中的應用[J]. 重慶郵電學院學報，2002;(1)