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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。
In this paper, we propose a technique of using white light optical spectrum analysis system to obtain the color coded spectrum of speech signal. With the cathode ray oscilloscope, the voice signal recorded on the tape is firstly transformed into the change of the amplitude transmittance of the photographic film by means of the density modulation so as to realize the signal transition from the time domain to the space domain. Then, in the white optical spectrum analysis system, a frequency-false-color-coded spectrogram is obtained by using sampling slits placed on the Fourier spectrum plane. In this paper, a preliminary discussion is made on white light optical spectrum analysis system with partial coherence theory, and some frequency false color coded spectra of some Chinese speech signals are given.