{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,24]],"date-time":"2026-09-24T23:46:25Z","timestamp":1790293585626,"version":"4.1.0"},"reference-count":14,"publisher":"Acoustical Society of America (ASA)","issue":"6","content-domain":{"domain":["pubs.aip.org"],"crossmark-restriction":true},"short-container-title":[],"published-print":{"date-parts":[[2004,12,1]]},"abstract":"<jats:p>Ring doves (Streptopelia risoria) produce a \u201ccoo\u201d vocalization that is essentially a pure-tone sound at a frequency of about 600 Hz and with a duration of about 1.5 s. While making this vocalization, the dove inflates the upper part of its esophagus to form a thin-walled sac structure that radiates sound to the surroundings. It is a reasonable assumption that the combined influence of the trachea, glottis and inflated upper esophagus acts as an effective band-pass filter to eliminate higher harmonics generated by the vibrating syringeal valve. Calculations reported here indicate that this is indeed the case. The tracheal tube, terminated by a glottal constriction, is the initial resonant structure, and subsequent resonant filtering takes place through the action of the inflated esophageal sac. The inflated esophagus proves to be a more efficient sound radiating mechanism than an open beak. The action of this sac is only moderately affected by the degree of inflation, although an uninflated esophagus is inactive as a sound radiator. These conclusions are supported by measurements and observations that have been reported in a companion paper.<\/jats:p>","DOI":"10.1121\/1.1811491","type":"journal-article","created":{"date-parts":[[2004,12,8]],"date-time":"2004-12-08T23:37:30Z","timestamp":1102549050000},"page":"3750-3756","update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":26,"title":["Vocal tract filtering and the \u201ccoo\u201d of doves"],"prefix":"10.1121","volume":"116","author":[{"given":"Neville H.","family":"Fletcher","sequence":"first","affiliation":[{"name":"Research School of Physical Sciences and Engineering, Australian National University, Canberra\u20090200, Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Tobias","family":"Riede","sequence":"additional","affiliation":[{"name":"Institute for Theoretical Biology, Humboldt-University Berlin, Invalidenstrasse 43, 10115\u2009Berlin, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Gabri\u00ebl J. L.","family":"Beckers","sequence":"additional","affiliation":[{"name":"Behavioural Biology, Institute of Biology, Leiden University, P.O. Box 9516, 2300\u2009RA\u2009Leiden, The Netherlands"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Roderick A.","family":"Suthers","sequence":"additional","affiliation":[{"name":"School of Medicine, Jordan Hall, Indiana University, Bloomington, Indiana\u200947405"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"231","published-online":{"date-parts":[[2004,12,8]]},"reference":[{"key":"2023071405495684800_bal95","first-page":"455","article-title":"The syrinx of the collared dove (Streptopelia decaocto): structure inter-individual variation and development","volume":"45","year":"1995","journal-title":"Netherlands J. 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