The frequency pseudocolor-coded speech spectrogram is then obtained by means of a sampling narrow slit placed at Fourier plane in white-light optical spectrum analyzer.
然后在白光光学频谱分析系统中，利用放置在傅里叶频谱面上的取样狭缝得到按频率假彩色编码的频谱图。
2
According to spatial filter character, a common slit can become a practical optical filter by adding two couples of shades.
根据空间滤波特点，在普通单缝上增加两对挡光片，使之成为一种实用的光学滤波器。
3
Bying adding an oscillator mirror in the imaging path, thus the enlarged image will be scanned by the narrower slit, and the optical boundary information is converted into gradient electrical pulse.