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Abstract
A digital technique for high-speed visualization of vibration, called videokymography,
was developed and applied to the vocal folds. The system uses a modified video camera
able to work in two modes: high-speed (nearly 8,000 images/s) and standard (50 images/s
in CCIR norm). In the high-speed mode, the camera selects one active horizontal line
(transverse to the glottis) from the whole laryngeal image. The successive line images
are presented in real time on a commercial TV monitor, filling each video frame from
top to bottom. The system makes it possible to observe left-right asymmetries, open
quotient, propagation of mucosal waves, movement of the upper and, in the closing
phase, the lower margins of the vocal folds, etc. The technique is suitable for further
processing and quantification of recorded vibration.