describe glottal vibratory cycle

Expert Solution

Ans. Glottal vibratory cycle is a process of production voice by the vibration of the vocal fold called glottal cycle. This process is governed by the opening and closing of the vocal fold letting short puffs of air through at high speed producing air pressure which is converted to sound waves.

The process : 3 step process

1. Column of air pressure moving towards the vocal fold.

2. By the coordinated action of the diaphragm, abdominal muscles, chest muscles, and rib cage, air is moved out of the lungs and towards the vocal folds.

3. Vocal fold vibration - sequence of vibratory cycle

Folds are moved to midline with the help of voice box muscles, nerves, and cartilages
One vibratory cycle,

Column of air pressure opens the bottom of voval fold
Continuing the air flow upwards, towards the top of vocal folds, and opens the top
The low pressure created behind the fast moving air columnl will produces a “Bernoulli effect” which causes the bottom to close.
Closure of the vocal fold will cut off the air column and releases a pulse of air.
This cycle repeats

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