{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,1,10]],"date-time":"2026-01-10T02:38:33Z","timestamp":1768012713521,"version":"3.49.0"},"reference-count":28,"publisher":"Acoustical Society of America (ASA)","issue":"1","content-domain":{"domain":["pubs.aip.org"],"crossmark-restriction":true},"short-container-title":[],"published-print":{"date-parts":[[2012,1,1]]},"abstract":"<jats:p>The closed quotient, i.e., the ratio between the closed phase and the period, is commonly studied in voice research. However, the term may refer to measures derived from different methods, such as inverse filtering, electroglottography or high-speed digital imaging (HSDI). This investigation compares closed quotient data measured by these three methods in two boy singers. Each singer produced sustained tones on two different pitches and a glissando. Audio, electroglottographic signal (EGG), and HSDI were recorded simultaneously. The audio signal was inverse filtered by means of the decap program; the closed phase was defined as the flat minimum portion of the flow glottogram. Glottal area was automatically measured in the high speed images by the built-in camera software, and the closed phase was defined as the flat minimum portion of the area-signal. The EGG-signal was analyzed in four different ways using the matlab open quotient interface. The closed quotient data taken from the EGG were found to be considerably higher than those obtained from inverse filtering. Also, substantial differences were found between the closed quotient derived from HSDI and those derived from inverse filtering. The findings illustrate the importance of distinguishing between these quotients.<\/jats:p>","DOI":"10.1121\/1.3662061","type":"journal-article","created":{"date-parts":[[2012,1,17]],"date-time":"2012-01-17T00:59:26Z","timestamp":1326761966000},"page":"435-441","update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":11,"title":["Comparing closed quotient in children singers\u2019 voices as measured by high-speed-imaging, electroglottography, and inverse filtering"],"prefix":"10.1121","volume":"131","author":[{"given":"Ann-Christine","family":"Mecke","sequence":"first","affiliation":[{"name":"Hochschule f\u00fcr Musik und Theater \u201cFelix Mendelssohn Bartholdy\u201d Leipzig, Dittrichring 21, D-04109 Leipzig, Germany"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Johan","family":"Sundberg","sequence":"additional","affiliation":[{"name":"KTH Voice Research Centre, Speech Music & Hearing, Lindstedtsv\u00e4gen 24, SE-10044 Stockholm, Sweden"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Svante","family":"Granqvist","sequence":"additional","affiliation":[{"name":"KTH Voice Research Centre, Speech Music & Hearing, Lindstedtsv\u00e4gen 24, SE-10044 Stockholm, Sweden"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Matthias","family":"Echternach","sequence":"additional","affiliation":[{"name":"Institut for Musicians\u2019 Medicine, Freiburg University Medical Center , Breisacher Strasse 60, D-79106 Freiburg im Breisgau, Germany"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"231","published-online":{"date-parts":[[2012,1,13]]},"reference":[{"key":"2023072704413906200_c1","doi-asserted-by":"publisher","first-page":"319","DOI":"10.1067\/S0892-1997(03)00070-5","article-title":"Simultaneous analysis of vocal fold vibration and transglottal airflow: Exploring a new experimental setup","volume":"17","year":"2003","journal-title":"J. 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