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超外差接收
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超外差接收
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【通信基础理论】
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superheterodyne receiving
超外差接收
将接收到的已调高频信号(即调制后的高频信号)送到混频器,然后与本地振荡器所产生的高频信号进行混频,在其输出端得到的波形包络形状与输入高频信号相同,但频率却降为某一固定中间频率(简称中频)的信号接收技术。
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