First International Conference on Spoken Language Processing (ICSLP 90)
By using a newly developed high-speed digital Image recording system, the relationship between vocal cord vibration and voice source charateristics has been investigated. The system employs either a fiberscope or a solid type endoscope combined with an image sensor and a digital image memory. Video signals from the image sensor are A/D converted and stored in the image memory. Since the system does not have any mechanical unit producing noise sounds, simultaneous recording of vocal cord vibration and speech signal can. be performed easily. Fiberscope system made it possible to observe vocal cord vibration during running speech. Specifically, pattern of vocal cord vibration at the release of the consonants were analysed. Solid endoscope system has been used for observing sustained phonation of pathological voice. It has brighter image than fiberscope system and thus, has better resolution. Many cases of rough voice show asymmetric and/or asynchronous movements between the right and left vocal cords, and between the anterior and posterior to parts of the vocal cords. These movements appear to be related the periodical fluctuations in the vibratory pattern which produce corresponding fluctuations in the speech waveform.
Bibliographic reference. Kiritani, Shigeru / Imagawa, Hiroshi / Hirose, Hajime (1990): "Vocal cord vibration and voice source characteristics - observations by a high-speed digital image recording -", In ICSLP-1990, 61-64.