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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 cords; that is, the optimal combination of airflow and glottal tension that yields maximum vibration.[1]

In linguistics, modal voice is the only phonation found in the vowels and other sonorants (consonants such as m, n, l, and r) of most of the languages of the world, though a significant minority contrast modal voice with other phonations. Among obstruents (consonants such as k, g, ch, j, s, and z), it is very common for languages to contrast modal voice with voicelessness, though in English many supposedly voiced obstruents do not have modal voice in most environments.[1]

In speech pathology, the modal register is one of the four identifiable registers within the human voice, lying above the vocal fry register and overlapping the lower part of the falsetto register. This view is also adopted by many vocal pedagogists, although some vocal pedagogists may view vocal registration differently. In singing, the modal register may also overlap part of the whistle register. A well trained singer or speaker can phonate two octaves or more within the modal register with consistent production, beauty of tone, dynamic variation, and vocal freedom.[2] The modal register begins and ends in different places within the human voice. The placement of the modal register within the individual human voice is one of the key determining factors in identifying vocal type.[3]

Physiological process of the modal register[edit]

In the modal register the length, tension, and mass of the vocal folds are in a state of flux which causes the frequency of vibration of the vocal folds to vary.[3] As pitch rises, the vocal folds increase in length and in tension and their edges become thinner. If a speaker or singer holds any of these three factors constant and interferes with their progressive state of change the laryngeal function of the voice becomes static and eventually breaks occur resulting in obvious changes in vocal quality. While some vocal pedagogists identify these breaks as register boundaries or transition areas between registers, other vocal pedagogists maintain that these breaks are a result of vocal problems caused by a static laryngeal adjustment that does not permit the necessary changes to take place within the modal register.[2]

Vocal cord, scheme
Glottal cycle, modal voice

On the lower pitches in the modal register the vocal cords are thick and wedge-shaped. Because of this thickness, large portions of the opposing surfaces of the vocal cords are brought into contact, and the glottis remains closed for a considerable time in each cycle. The glottis opens from the bottom first before it opens at the top; this imparts a fluid, wavelike motion to the cords. The modal voice has a broad harmonic spectrum, rich in overtones, because of this rolling motion of the cords. It is comparatively loud to the other vocal registers because of the vibratory energy present, but is capable of dynamic variation.[4]

For the lowest tones, only the thyroarytenoid muscles are active, but as the pitch rises, the cricothyroids enter the action, thus beginning to lengthen the folds. As longitudinal tension increases, the glottis tends to develop a gap in the middle. To counteract this tendency, the lateral cricoarytenoids are brought into action, pulling forward on the muscular process of the arytenoids. This process is sometimes referred to as medial compression.[5]

In addition to the stretching of the vocal folds and the increasing tension on them as the pitch rises, the opposing surfaces of the folds which may be brought into contact becomes smaller and smaller as the edges of the folds become thinner. The basic vibratory or phonatory pattern remains the same, with the whole vocal fold still involved in the action, but the vertical excursions are not as large and the rolling motion is not as apparent as it was on the lower pitches of the modal register.[6] The physical limits of muscular strength of the internal thyroarytenoids or vocalis muscle are being approached. In order to sing or speak above this pitch level the voice must adopt a new phonatory pattern-to change registers.[2]

References[edit]

  1. ^ a b Ladefoged, Peter; Maddieson, Ian (1996). The Sounds of the World's Languages. Oxford: Blackwell. ISBN 0-631-19814-8. 
  2. ^ a b c McKinney, James (1994). The Diagnosis and Correction of Vocal Faults. Genovex Music Group. ISBN 978-1-56593-940-0. 
  3. ^ a b Large, John (February–March 1972). "Towards an Integrated Physiologic-Acoustic Theory of Vocal Registers". NATS Bulletin 28: 30–35. 
  4. ^ Van den Berg, J.W. (December 1963). "Vocal Ligaments versus Registers". NATS Bulletin 19: 18. 
  5. ^ Vennard, William (1967). Singing: The Mechanism and the Technic. Carl Fischer. ISBN 978-0-8258-0055-9. 
  6. ^ Greene, Margaret; Lesley Mathieson (2001). The Voice and its Disorders (6E ed.). John Wiley & Sons. ISBN 978-1-86156-196-1. 

Further reading[edit]

  • Cooper, Morton (1973). Modern Techniques of Vocal Rehabilitation. Charles C. Thomas. ASIN B000JC1U76. 

Original courtesy of Wikipedia: http://en.wikipedia.org/wiki/Modal_voice — Please support Wikipedia.
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