Glottal flow

What Makes a Voice Acoustically Strong? (Article)
A voice is acoustically strong if the glottal flow can be reduced from a high value to a low value in a short time interval. The total collapse of flow per second is called the maximum flow declination rate. It can be increased by increasing lung pressure, by increasing vibration at the bottom of the vocal fold, or by narrowing the acoustic tube immediately above the vocal folds. In practice, a combination of these control strategies is probably utilized by singers. (posted 2:34 PM, August 27, 2014)

How Are Harmonics Produced at the Voice Source? (Article)
In summary, harmonics in the glottal waveform are produced by adducing the vocal folds sufficiently so that they can collide. This changes the waveform from a simple oscillatory shape that has only one frequency. Alternately, or in conjunction with collision, the vocal tract can be engaged to feed back an acoustic wave to the glottal flow. (posted 2:34 PM, August 27, 2014)

The Search for Efficient Voice Production: Where Is It Leading Us? (Article)
The essay sheds light on the ongoing efforts to define what is meant by efficient voice production, that which gives the most output for the least effort. Most pedagogues, clinicians, and voice scientists have wrestled somewhat with this problem because voices are not often big enough or enduring enough for a given vocal task. (posted 2:34 PM, August 27, 2014)

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