{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,27]],"date-time":"2026-08-27T08:24:09Z","timestamp":1787819049874,"version":"build-2784847793"},"reference-count":24,"publisher":"Acoustical Society of America (ASA)","issue":"1","content-domain":{"domain":["pubs.aip.org"],"crossmark-restriction":true},"short-container-title":[],"published-print":{"date-parts":[[2002,1,1]]},"abstract":"<jats:p>Two competing views of regulating glottal airflow for maximum vocal output are investigated theoretically. The maximum power transfer theorem is used as a guide. A wide epilarynx tube (laryngeal vestibule) matches well with low glottal resistance (believed to correspond to the \u201cyawn-sigh\u201d approach in voice therapy), whereas a narrow epilarynx tube matches well with a higher glottal resistance (believed to correspond to the \u201ctwang-belt\u201d approach). A simulation model is used to calculate mean flows, peak flows, and oral radiated pressure for an impedance ratio between the vocal tract (the load) and the glottis (the source). Results show that when the impedance ratio approaches 1.0, maximum power is transferred and radiated from the mouth. A full update of the equations used for simulating driving pressures, glottal flow, and vocal tract input pressures is provided as a programming guide for those interested in model development.<\/jats:p>","DOI":"10.1121\/1.1417526","type":"journal-article","created":{"date-parts":[[2002,7,26]],"date-time":"2002-07-26T10:10:47Z","timestamp":1027678247000},"page":"367-376","update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":96,"title":["Regulating glottal airflow in phonation: Application of the maximum power transfer theorem to a low dimensional phonation model"],"prefix":"10.1121","volume":"111","author":[{"given":"Ingo R.","family":"Titze","sequence":"first","affiliation":[{"name":"Department of Speech Pathology and Audiology and The National Center for Voice and Speech, 330 Wendell Johnson Speech and Hearing Center, The University of Iowa, Iowa City, Iowa\u200952242-1012"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"231","reference":[{"key":"2023071408502856400_ali00","doi-asserted-by":"crossref","first-page":"3003","DOI":"10.1121\/1.1324678","article-title":"A finite-element model of vocal fold vibration","volume":"108","year":"2000","journal-title":"J. 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