acoustic ratio

acoustic ratio

[ə′küs·tik ′rā·shō]
(engineering acoustics)
The ratio of the intensity of sound radiated directly from a source to the intensity of sound reverberating from the walls of an enclosure, at a given point in the enclosure.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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F3 is linked with the front (oral) cavity for /i/ in male speakers, but a shorter pharyngeal cavity in women changes the acoustic ratio between front and back space.