The term phonation has slightly different meanings depending on the subfield of phonetics. Among some phoneticians, phonation is the process by which the vocal folds produce certain sounds through quasi-periodic vibration. This is the definition used among those who study laryngeal anatomy and physiology and speech production in general. Phoneticians in other subfields, such as linguistic phonetics, call this process voicing, and use the term phonation to refer to any oscillatory state of any part of the larynx that modifies the airstream, of which voicing is just one example. Voiceless and supra-glottal phonations are included under this definition.
Voicing
The phonatory process, or voicing, occurs when air is expelled from the lungs through the glottis, creating a pressure drop across the larynx. When this drop becomes sufficiently large, the vocal folds start to oscillate. The minimum pressure drop required to achieve phonation is called the phonation threshold pressure, and for humans with normal vocal folds, it is approximately 2–3cm H2O. The motion of the vocal folds during oscillation is mostly lateral, though there is also some superior component as well. However, there is almost no motion along the length of the vocal folds. The oscillation of the vocal folds serves to modulate the pressure and flow of the air through the larynx, and this modulated airflow is the main component of the sound of most voicedphones.
Michael Card There's a force in the dark that's waiting for you And it's telling your heart what it wants to do But the light is there and it wants to shine through You never know how dark it is inside till you Chorus Face the light, don't stumble in the darkness Face the light, see how dark your heart is Face the light, never see the shadows Only face the light Face the light, don't know how much you need Him Face the light, just turn around and see Him Face the light, He'll take away the darkness Only face the light There are just two ways and you better choose right You can die in the dark or you can live in the light One is the Way, the Truth, the Life The other's dark and never leads to home Won't you
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As always, we continue to invest in a wide variety of quality films and TV shows to meet our members' needs, and celebrate voices from around the world,” the statement said.
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