This is the abstract from paper III in my licentiate thesis.
A method of applying Fourier analysis to high-speed laryngoscopy
A new method for analysis of digital high-speed recordings of vocal fold vibrations is presented. The method is based on the extraction of light intensity time-sequences from consecutive images, which in turn are Fourier-transformed. The spectra thus acquired can be displayed in four different modes, each having its own benefits. When applied to the larynx the method visualizes oscillations in the entire laryngeal area, not merely the glottal region. The method was applied to two laryngoscopic high-speed image sequences. Among these examples, co-vibrations in the ventricular folds and in the mucosa covering the arytenoid cartilages were found. In some cases the co-vibrations occurred at other frequencies than those of the glottis.
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