本文提出了利用白光光学频谱分析系统获得语音信号彩色编码频谱的技术。借助于阴极射线示波器,首先将录制在磁带上的语音信号用密度调制的方法转变为照相底片的振幅透射率的变化,从而实现信号由时域到空域的转变。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。文中用部分相干理论对白光光学频谱分析系统作了初步的讨论,并给出了若干中文语音信号的频率假彩色编码谱图。

The technique for generating color-coded speech spectrogram utilizing a white-light optical spectrum analyzer is described. First a conversion of the speech signal prerecorded on a magnetic tape to amplitude transmittance of photographic film is accomplished with a cathode ray tube (CRT) using density modulation method. 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. Operation of the system with theory of partially coherent ligkt is discussed briefly in this paper. And some color-coded Giiinese speech spectrograms are also provided.