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Videostroboscopy is a high-speed medical imaging method used to visualize the dynamics of human vocal fold vibration. When stimulated by the pressure of breath exhaled from the lungs, the two vocal folds (also known as vocal cords) open and close rapidly. This process is called phonation and produces the sound of the human voice.
Accompanied by breath under lung pressure, the glottis and vocal folds move in an open-close motion. During the opening and closing, the process by which the vocal folds meet is referred to as phonation (non-technically called vocalization), which is the general function of how vocal sound is produced. During phonation, vibratory cycles occur ...
The vocal folds are commonly referred to as vocal cords, and less commonly as vocal flaps or vocal bands. The term vocal cords was coined by the French anatomist Antoine Ferrein in 1741. In his violin analogy of the human voice , he postulated that the moving air acted like a bow on cordes vocales . [ 43 ]
The lungs, the "pump" must produce adequate airflow and air pressure to vibrate vocal folds. The vocal folds (vocal cords) then vibrate to use airflow from the lungs to create audible pulses that form the laryngeal sound source. [1] The muscles of the larynx adjust the length and tension of the vocal folds to 'fine-tune' pitch and tone.
Voiced speech is produced by air streaming from the lungs through the vocal cords, setting them into an oscillating movement. [6] [7] In every oscillation, the vocal folds are closed for a short period of time. When the folds reopen the pressure under the folds is released. These changes in pressure form the waves called (voiced) speech.
Depth-kymography is the 3D display of the human vocal fold vibrations by measuring their vertical and horizontal movements simultaneously, using a specially designed 3D endoscope. This 3D imaging method and the scientific term "Depth-Kymography" were introduced by Dr. Nibu A George, Prof. Frits de Mul and Prof. Harm Schutte.
Voice problems that require voice analysis most commonly originate from the vocal folds or the laryngeal musculature that controls them, since the folds are subject to collision forces with each vibratory cycle and to drying from the air being forced through the small gap between them, and the laryngeal musculature is intensely active during speech or singing and is subject to tiring.
Modal voice is the vocal register used most frequently in speech and singing in most languages. It is also the term used in linguistics for the most common phonation of vowels. The term "modal" refers to the resonant mode of vocal folds; that is, the optimal combination of airflow and glottal tension that yields maximum vibration. [1] [page needed]