発声における声門気流能率の研究

―吹鳴発声実験による検討―

抄録

The glottal flow efficiency (GFE), defined as alternating current component/direct current component of glottal air flow, or AC/DC by Isshiki, and the glottal power efficiency (GPE), defined as acoutic glottal power/aerodynamic glottal power by van den Berg were studied to compare the flow rate, vocal intensity, subglottal pressure, and glottal area.
The GFE was found to be a good indicator of the glottal area and vocal fold stiffness, while the GPE was not a good indicator because the noise produced at the glottic also contained acoustic energy.
The drawback of the GFE was its inability to correctly reflect the glottal condition, when the air flow provided for phonation was at an unusually low rate or the vocal intensity was at an extremely low level.
The critical GFE value indicating a complete glottal closure was estimated at around 50.