②总结了光外差调制技术，理论推导了利用光外差调制技术产生的光载毫米波信号的频谱结构。
The second, we summarize the optical heterodyning modulation technology, and calculate the spectrum of optical mm-wave signal generated by this modulation technology.
数字自适应外差滤波器运用外差调制的概念，使滤波在低频率处操作，从而降低了滤波器的复杂程度。
Digital adaptive heterodyne filter adopts the heterodyne-modulation conception, which makes the filter work in low frequency and lessens the complexity of design.
本文详细推导了用振幅调制激光为光源外差激光探针的信号光与参考光干涉光强表达式。
In the paper. the interference intensity of signal laser beam and the reference one is carried out in detail on a heterodyne laser probe with amplitude modulated laser source.
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