Variation in Vocal Fold Vibration Associated with Prosodic Conditions

Recently, a high-speed digital image recording of the vocal fold vibration at a rate of 4500 frames per second with the 256x256 picture elements has become possible. By using this technique, pattern of the vocal fold vibration under several different prosodic conditions, especially that of the utterance final position, were investigated. Imaging of the vocal fold vibration revealed that during the production of the vocal fry , the closure period from time to time to become very lengthy. After this lengthy closure period, the vibration tends to start with weak oscillation and during the following cycles, the oscillation builds up. It is suggested that this process explains the occurrence of multiple vibratory patterns associated with the vocal fry.