Journal
JOURNAL OF VOICE
Volume 30, Issue 4, Pages 398-406Publisher
MOSBY-ELSEVIER
DOI: 10.1016/j.jvoice.2015.06.002
Keywords
AC/DC ratio; Vocal efficiency; Oral pressure; Vocal effort
Funding
- National Institute on Deafness and Other Communication Disorders [5R01 DC012045-04]
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Voice production is an inefficient process in terms of energy expended versus acoustic energy produced. A traditional efficiency measure, glottal efficiency, relates acoustic power radiated from the mouth to aerodynamic power produced in the trachea. This efficiency ranges between 0.0001% and 1.0%. It involves lung pressure and hence would appear to be a useful effort measure for a given acoustic output. Difficulty in the combined measurement of lung pressure and tracheal airflow, however, has impeded clinical application of glottal efficiency. This article uses the large data base from Schutte (1980) and a few new measurements to validate a pressure conversion ratio (PCR) as a substitute for glottal efficiency. PCR has the potential for wide application because of low cost and ease of use in clinics and vocal studios.
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