... zero frequency current 零频电流 zero frequency 零频 zero frequency 零频率直流 ...
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它可强制滤波器组的频率特性在零频形成零点并使旁瓣面积最小。
It can constrain frequency response of filter Banks to form null at zero frequency point and to obtain minimum side lobe area.
利用干涉图的零频分量消除光源谱分布的影响，获得两束干涉光的振幅比；
The effect of the light source spectral distribution can be cancelled out with the help of the zero order spectrum of the Fourier transform of the interferogram.
平地效应使干涉纹图中的主要频率不在零频，不能反映实际地面高程的变化。
The flat-earth makes the main frequency of the interferogram not at the zero frequency, and can't reflect the change of the topographic altitude.
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