lecture5

lecture5 - Sound Vocal Fold Vibration Self-oscillating...

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Unformatted text preview: Sound Vocal Fold Vibration Self-oscillating system Myoelastic-aerodynamic theory Expiratory force pushes the folds apart Two forces pull them together Elastic recoil Bernoulli forces Computer Model of VF Motion Sound Production Sound is produced at the moment of vocal fold closure by the sudden interruption in the expiratory air stream. This results in a sudden reduction in air pressure. We hear deviation in the normal periodic pattern or extent of glottal closure as a voice disorder. Physical Model of Particle Velocity Acoustic Waveform Voice Production The better the voice, the faster the closure of both vocal folds within each cycle and the longer the duration of closure. Symmetric and large vocal fold mucosal waves usually indicate fast closure, only observed by stroboscopy or high speed video. Necessary Components For Adequate Glottal Closure Phonatory posture Expiratory force Pressure difference across glottis Mass of vocal folds Cover-body stiffness Left-right symmetry in mass and stiffness...
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lecture5 - Sound Vocal Fold Vibration Self-oscillating...

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