摘 要： 介紹了HSP50214B數(shù)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(jié)構(gòu)，在此基礎(chǔ)上設(shè)計(jì)了一種數(shù)字解調(diào)模塊，并就HSP50214B在其中的應(yīng)用和配置作了詳細(xì)的分析，最后給出了該數(shù)字解調(diào)模塊在數(shù)字監(jiān)測接收系統(tǒng)中的應(yīng)用。實(shí)驗(yàn)證明，該模塊在無線電接收系統(tǒng)中有著很強(qiáng)的實(shí)用性。
關(guān)鍵詞： 解調(diào) 數(shù)字下變頻 HSP50214B
在數(shù)字式接收系統(tǒng)中，A/D轉(zhuǎn)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(shí)時接收、存儲、解調(diào)與分離等任務(wù)。當(dāng)前廣泛采用的方法是直接使用硬件完成數(shù)字下變頻，即用數(shù)字下變頻器將高速數(shù)據(jù)流變成當(dāng)前DSP可實(shí)時處理的中低速數(shù)據(jù)流?；谶@種思想，設(shè)計(jì)了一種基于下變頻器的數(shù)字解調(diào)模塊。該模塊采用數(shù)字下變頻器HSP50214B進(jìn)行下變頻，經(jīng)過抽取、濾波、降低數(shù)據(jù)率，將下變頻后的數(shù)據(jù)送至TMS320C5409 DSP，完成數(shù)字解調(diào)功能。此方案結(jié)構(gòu)簡單、處理方式靈活，非常適用于載波頻率、符號速率和調(diào)制樣式可變的無線電接收系統(tǒng)。
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(shù)字下變頻器，能將中頻采樣信號轉(zhuǎn)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(nèi)插(Interpolation)濾波器等級聯(lián)" title="級聯(lián)">級聯(lián)完成。除了上述功能外，HSO50214B還能完成自動增益控制、片內(nèi)和片間的同步控制、載波和碼元跟蹤以及部分常規(guī)信號的解調(diào)等功能。該芯片可以直接和DSP相連，傳遞控制信號、狀態(tài)信息及基帶數(shù)據(jù)。
1.2 HSP50214B的結(jié)構(gòu)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(shù)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(nèi)插濾波器、定時數(shù)控振蕩器、笛卡兒坐標(biāo)與極坐標(biāo)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(shù)字中頻信號進(jìn)入下變頻器后，經(jīng)過兩個乘法器和復(fù)正弦信號產(chǎn)生器產(chǎn)生的正交正弦信號相乘。相乘結(jié)果作為I、Q兩路信號，此時采樣頻率fs并沒有發(fā)生改變。兩路信號分別經(jīng)一組級聯(lián)的低通濾波器濾波并完成抽取后變?yōu)榛鶐盘枺@就是下變頻抽取過程。此時，信號采樣率變?yōu)閒s/M，其中M為級聯(lián)的抽取因子。整個下變頻器的核心部件為級聯(lián)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(dá)到65MS/s，后端處理速度PROCLK達(dá)到55MS/s；32位的可編程載頻數(shù)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(dá)4～16384，由于有了重采樣級，抽取因子可以是非整數(shù)；輸出低通帶寬982kHz時，輸出采樣率可達(dá)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(biāo)(I、Q)到極坐標(biāo)(
，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(diào)。
2 基于HSP50214B的數(shù)字解調(diào)模塊的設(shè)計(jì)
2.1 數(shù)字解調(diào)模塊的原理框圖及工作原理
數(shù)字解調(diào)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(jié)合外圍電路構(gòu)成DSP應(yīng)用系統(tǒng)。
模擬中頻信號經(jīng)A/D轉(zhuǎn)換器采樣(采樣頻率可編程，最高采樣速率達(dá)65MHz，12bit)后送入HSP50214B進(jìn)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(nèi)鑒幅、鑒相模塊進(jìn)行解調(diào)，再通過串口輸出至D/A轉(zhuǎn)換器，得到語音輸出；對于其他調(diào)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(shù)據(jù)從BI-FIFO讀入，進(jìn)行解調(diào)處理。數(shù)字解調(diào)模塊通過PCI總線與主機(jī)進(jìn)行通信，傳輸解調(diào)結(jié)果和控制命令等。
2.2 HSP50214B的接口設(shè)計(jì)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(nèi)部寄存器參數(shù)進(jìn)行設(shè)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(shù)據(jù)總線C[7:0]，設(shè)置HSP50214B的256個寄存器參數(shù)。在寫入過程中，寄存器的參數(shù)為32位，而數(shù)據(jù)總線只有8位，在寫入32位數(shù)據(jù)時，需將數(shù)據(jù)通過C[7:0] ，按照字節(jié)的高低順序，分四次寫入到四個8位保持寄存器中。在進(jìn)行寄存器參數(shù)設(shè)置時，不但要給定參數(shù)還要指定寄存器地址(1～256)，該地址緊跟著參數(shù)被寫入到一個8位的寄存器中。A[2:0]決定數(shù)據(jù)總線C[7:0]數(shù)據(jù)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(fā)電路產(chǎn)生脈沖和同步時鐘來裝載寄存器的參數(shù)。圖4給出了裝載寄存器數(shù)據(jù)的時序。C[7:0]中的數(shù)據(jù)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(shù)字解調(diào)模塊可以對不同中頻輸出信號在接收前端實(shí)現(xiàn)解調(diào)分析功能。應(yīng)用中可根據(jù)實(shí)際的需求，設(shè)置各寄存器的參數(shù)，包括CIC、AGC、串并口、輸出格式、濾波器的系數(shù)等。模塊上電時，DSP在進(jìn)行初始化的過程中將各寄存器的參數(shù)設(shè)置到HSP50214B的目的寄存器中。該數(shù)字解調(diào)模塊可以實(shí)現(xiàn)前端高速采樣、靈活的下變頻設(shè)置和DSP的軟解調(diào)功能，可以對不同調(diào)制方式實(shí)現(xiàn)靈活解調(diào)分析，具有適應(yīng)性強(qiáng)、軟件升級方便等特點(diǎn)。
由于HSP50214B配置的靈活性和DSP良好的可編程性，該解調(diào)模塊可以通過編程實(shí)現(xiàn)各種調(diào)制信號的解調(diào)分析，實(shí)驗(yàn)驗(yàn)證了該模塊可以適用于不同的無線接收系統(tǒng)。
3 數(shù)字解調(diào)模塊在數(shù)字監(jiān)測接收系統(tǒng)中的應(yīng)用
數(shù)字監(jiān)測接收系統(tǒng)主要完成指定波段內(nèi)廣播信號和電臺信號的快速搜索和監(jiān)測功能，以便及時發(fā)現(xiàn)非法廣播信號和電臺信號，為實(shí)施干擾提供情報(bào)支援。
系統(tǒng)主要由接收天線、寬帶射頻接收、寬帶數(shù)據(jù)采集卡、窄帶射頻接收、窄帶解調(diào)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(shí)現(xiàn)全景接收；窄帶射頻接收部分和窄帶解調(diào)處理部分根據(jù)終端下達(dá)的指令，完成指定頻點(diǎn)的監(jiān)測分析和解調(diào)功能；PC終端處理顯示部分完成數(shù)據(jù)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(diào)處理模塊是文中所述的基于HSP50214B和TMS320C5409 DSP的解調(diào)模塊，在窄帶分析處理中承擔(dān)著數(shù)字下變頻和完成解調(diào)功能的任務(wù)。系統(tǒng)功能組成框圖如圖5所示。
解調(diào)處理模塊對窄帶接收的中頻信號進(jìn)行采集處理，并將解調(diào)分析后的數(shù)據(jù)通過PCI總線傳送至PC終端進(jìn)行顯示、管理(頻譜、調(diào)制樣式、帶寬、調(diào)制度、電平等)。對于AM、CW、FM信號，可通過其串口輸出解調(diào)后的話音信息。
現(xiàn)以在短波波段接收的調(diào)幅信號分析為例，給出解調(diào)模塊中HSP50214B的配置和解調(diào)分析結(jié)果。
HSP50214B配置的主要參數(shù)：采樣頻率為64MHz/16＝4MHz，載波數(shù)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，F(xiàn)IR抽頭數(shù)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(zhuǎn)換后輸出語音信號；并口輸出下變頻后的I、Q兩路數(shù)據(jù)至DSP進(jìn)行頻譜分析并將結(jié)果向上傳送。圖6所示為一個AM信號分析結(jié)果，包括調(diào)幅度、帶寬、調(diào)制樣式、頻譜瀑布圖顯示等。
數(shù)字下變頻器在數(shù)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(yīng)用廣泛。HSP50214B提供了靈活的可編程特性，利用它可以方便地設(shè)計(jì)出能夠?qū)崟r處理多種通信信號的接收機(jī)。本文設(shè)計(jì)的基于HSP50214B的數(shù)字解調(diào)模塊正是利用此特性，配合DSP，可以靈活解調(diào)各種調(diào)制方式的通信信號，適用性強(qiáng)?？梢灶A(yù)見，隨著軟件無線電和各種用途的電子信息接收系統(tǒng)的發(fā)展，其應(yīng)用前景非常廣闊。
參考文獻(xiàn)
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(shù)字信號處理 [M].北京：國防工業(yè)出版社，1985
4 趙義正. HSP50214B在數(shù)字解調(diào)系統(tǒng)中的應(yīng)用[J]. 重慶郵電學(xué)院學(xué)報(bào)，2002;(1)