Abstract

A white-light optical processing technique of generating speech spectrogram is presented. The speech spectrograms thus generated are frequency color-coded resulting in easier visual discrimination. The temporal-to-spatial conversion of speech signal is accomplished by means of density modulation with a CRT scanner. The scaling procedure of the speech spectrogram as well as the frequency resolution limit of the system is discussed. Experimental demonstrations of the proposed frequency color coded speech spectrograms generated by the proposed white-light optical processing technique are given.

© 1985 Optical Society of America

Measurement of noise performance for a white-light optical signal processor

Francis T. S. Yu, Le-Nian Zheng, and Fu-Kuo Hsu
Appl. Opt. 24(2) 173-178 (1985)

Coherence measurement of a grating-based white-light optical signal processor

F. T. S. Yu, F. K. Hsu, and T. H. Chao
Appl. Opt. 23(2) 333-340 (1984)

White light-in-flight holography

Franco Quercioli and Giuseppe Molesini
Appl. Opt. 24(20) 3406-3415 (1985)

Complex signal detection with broad spectral band processing

Francis T. S. Yu and Fu-Kuo Hsu
Appl. Opt. 24(14) 2135-2139 (1985)

Color image processing with CGH filters in a white light optical system

Michael S. Dymek and Francis T. S. Yu
Appl. Opt. 26(24) 5337-5344 (1987)