heterodyne

詳細解釋：

het.er.o.dyne

adj.（形容詞）
Having alternating currents of two different frequencies that are combined to produce two new frequencies, the sum and difference of the original frequencies, either of which may be used in radio or television receivers by proper tuning or filtering.
外差的：由兩股不同頻率的交替電流聯合產生兩個新的頻率的，原頻率的總和及差拍均可通過適當調頻或濾波用於無線電或電視接收
v.tr.（及物動詞）
het.er.o.dyned,het.er.o.dyn.ing,het.er.o.dynes
To combine (a radio-frequency wave) with a locally generated wave of different frequency in order to produce a new frequency equal to the sum or difference of the two.
外差：把（一個無線電頻率波）與另一個頻率不同的局部產生的電波層混合，以產生相當於原來兩個的總和或差拍的新頻率

來源：
hetero-
hetero-
-dyne [power, frequency] from Greek dunamis [power] * see dyne
-dyne [功率，頻率] 源自 希臘語 dunamis [功率] *參見 dyne