Journal article
Where has all the power gone? Energy production and loss in vocalization
Speech communication, Vol.101, pp.26-33
07/01/2018
DOI: 10.1016/j.specom.2018.05.003
PMCID: PMC6292679
PMID: 30555195
Abstract
•Vocal Efficiency is divided into conversion efficiency, transmission efficiency, and radiation efficiency.•Conversion efficiency is on the order of 10%.•Efficiency control is by lung pressure and adduction.
Human voice production for speech is an inefficient process in terms of energy expended to produce acoustic output. A traditional measure of vocal efficiency relates acoustic power radiated from the mouth to aerodynamic power produced in the trachea. This efficiency ranges between 0.001% and 1.0% in speech-like vocalization. Simplified Navier–Stokes equations for non-steady compressible airflow from trachea to lips were used to calculate steady aerodynamic power, acoustic power, and combined total power at seven strategic locations along the airway. A portion of the airway was allowed to collapse to produce self-sustained oscillation for sound production. A conversion efficiency, defined as acoustic power generated in the glottis to aerodynamic power dissipated, was found to be on the order of 10%, but wall vibration, air viscosity, and kinetic pressure losses consumed almost all of that converted power. Thus, the acoustic power, reflected back and forth in the airway was dissipated at a level on the order of 99.9%, with a small fraction being radiated to the listener.
Details
- Title: Subtitle
- Where has all the power gone? Energy production and loss in vocalization
- Creators
- Ingo R. Titze - University of Utah
- Resource Type
- Journal article
- Publication Details
- Speech communication, Vol.101, pp.26-33
- DOI
- 10.1016/j.specom.2018.05.003
- PMID
- 30555195
- PMCID
- PMC6292679
- NLM abbreviation
- Speech Commun
- ISSN
- 0167-6393
- eISSN
- 1872-7182
- Publisher
- Elsevier B.V
- Number of pages
- 8
- Language
- English
- Date published
- 07/01/2018
- Academic Unit
- School of Music; Communication Sciences and Disorders
- Record Identifier
- 9984719573902771
Metrics
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