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Acoustic duct

Explanation

Acoustic duct: An acoustic duct is a test facility used in acoustics. Anechoic chambers are typically subject to a low frequency limit, governed by the length of the sound absorbing wedges employed to prevent reflections within the chamber. Test and measurement microphone calibration services are often required to be undertaken at frequencies where anechoic chambers cannot be used effectively. In this case, a plane wave acoustic duct with anechoic termination provides a practical alternative.

Printed dictionaries and other books with definitions for Acoustic duct

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Google previewA London Encyclopaedia, Or Universal Dictionary of Science, Art, Literature and Practical Mechanics (1829)

Comprising a Popular View of the Present State of Knowledge : Illustrated by Numerous Engravings, a General Atlas, and Appropriate Diagrams by Thomas Curtis

Acoustic DUCT, in anatomy, the meatus auditorius, or external passage of the ear . See ANATOMY. Acoustic HNSTRUMENT, or auricular tube, See Acoustics. Acoustic MEDIcINEs, remedies against imperfections and disorders of the ear.

Google previewBeeton's Medical dictionary (1871)

by Samuel Orchart Beeton

Acoustic Duct. swcet-fing is sometimes used as an aromatic stimulant and a mild tonic, and many physicians speak highly of its beneficial effects in cases of ague. Acoustic Duct, d-koo'-stik, a term applied to the meatus auditorius extornus, ...

Google previewThe new encyclopædia; or, Universal dictionary ofarts and sciences (1807)

by Encyclopaedia Perthensis

Sec Acousma Acoustic Duct, in anatomy, the m auditorial, or external passage of the ear. S< NATOMY. Acoustic Instrument, or Auricular Sec Acoustics. Acoustic Medicines, remedies against perfections and disorders of the car. Acoustic Nerve ...

Google previewEncyclopaedia Perthensis, Or, Universal Dictionary of the Arts, Sciences, Literature, Etc (1816)

Intended to Supersede the Use of Other Books of Reference

Acoustic Duct, in anatomy, the meatus auditorius, or external passage of the ear. See Anato M. Y. Acoustic InstruMENT, or Auricular tube. See Acoustics. - Acoustic Medicines, remedies against imperfections and disorders of the ear. Acoustic ...

Google previewLexicon Medicum, Or, Medical Dictionary (1848)

Containing an Explanation of the Terms in Anatomy, Human and Comparative, Botany, Chemistry, Forensic Medicine, Materia Medica, Obstetrics, Pharmacy, Physiology, Practice of Physic, Surgery, Toxicology, and the Different Branches of Natural Sciences Connected with Medicine, Together with a Variety of Information on All These Subjects by Robert Hooper

Acoustic DUCT. The meatus auditorius externus. Acoustic NERVE. Portio mollis. Acoustico-MALLEUs. A muscle of the internal ear, described by the older anatomists as the third or external muscle of the malleus; but the greater part of modern ...

Google previewEncyclopaedia Perthensis; Or Universal Dictionary of the Arts, Sciences, Literature, &c. Intended to Supersede the Use of Other Books of Reference (1816)

Acoustic Duct, in anatomy, the meatus auditorius, or external passage of the ear. See An Ato M. Y. * Acoustic Instrum ENT, or Auricular tube. See Acoustics. Acoustic Medici N'es, remedies perfections and disorders of the ear. . Acoustic NEkve ...

Google previewEncyclopaedia Britannica; Or A Dictionary of Arts, Sciences, and Miscellaneous Literature (1823)

Acoustic Duct, in Anatomy, the same with meatus auditorius, or the external passage of the ear. See ANATo M. Y. - - Acoustic Instrument, or auricular tube. See Acoust ICS. Acoustic Wessels, in the ancient theatres, were a kind of vessels made ...

Google previewEncyclopaedia Metropolitana, Or, Universal Dictionary of Knowledge (1845)

Comprising the Twofold Advantage of a Philosophical and an Alphabetical Arrangement, with Appropriate Engravings by Edward Smedley, Hugh James Rose, Henry John Rose

Acoustic Duct, in Anatomy, the same with meatus auditurius, or the external passage of the ear. Acoustic Nerves. See Auditory Nerves, Anatomy, Div . ii.

Google previewA Technological Dictionary (1846)

Explaining the Terms of the Arts, Sciences, Literature, Professions, and Trades by W. M. Buchanan

Acoustic duct, in anatomy, the meatus auditorius, or external passage of the ear —Acoustic nerre, the portio mollis, the immediate organ of hearing. An acoustic medicine is one used for disorders of the sense of hearing. Acoustic instruments ...

Google previewA Comprehensive Medical Dictionary: containing the pronunciation, etymology, and signification of the terms made use of in Medicine and the kindred sciences. With an appendix, etc (1864)

Acoustic Duct. See Menus AUDITORIUS. Acous'tic Nerve. The auditory nerve, or Portia mollz'a of the seventh pair.

Google previewA Dictionary of Arts and Sciences (1807)

by George Gregory

Acoustic duct, in anatomy, a name sometimes given to the external passage of the ear, more usually called meatus auditorius. See ANAToMY. Acoustic instrument, or Ear Trumpet, one contrived to assist hearing. It is fashioned in manner of a ...

Google previewEncyclopaedia Britannica (1823)

Or, A Dictionary of Arts, Sciences, and Miscellaneous Literature, Enlarged and Improved

Acoustic Duct, in Anatomy, the same with meatus auditorius, or the external passage of the ear. See ANATOM Y. - Acoustic Instrument, or auricular tube. See AcouSTICS. Acoustic Pessels, in the ancient theatres, were a kind of vessels made of ...

Google previewThe Century Dictionary and Cyclopedia (1913)

With a New Atlas of the World : a Work of General Reference in All Departments of Knowledge

Acoustic duct. See acoustic and auditory.—Annular duct. See annular.— Archinephric duct, the duct of the archinephron, or primitive kidney.—Arterial duct , auditory duct, branchial duct. See the adjectives.— Biliary duct, one of the ramified ...

Google previewThe Century Dictionary (1914)

An Encyclopedic Lexicon of the English Language

See ti more: Acoustic duct, in anat., the meatus auditorius externus, or external passage of the ear. See auditory, and cut under earl.— Acoustic nerve, the auditory nerve.-Acoustic spot, macula acustica. See macula.-Acoustic £ an electric or ...

Google previewEncyclopædia Metropolitana; Or, Universal Dictionary of Knowledge ... (1845)

Comprising the Twofold Advantage of a Philosophical and an Alphabetical Arrangement, with Appropriate Engravings by Edward Smedley, Hugh James Rose, Henry John Rose

Acoustic Duct, in Anatomy, the same with meatus auditorius, or the external passage of the ear. Acoustic Nerves. See Auditony NER v Es, ANAToMy, Div. ii. Acoustic Vessels, vessels made of brass, shaped like a bell, and used in the ancient ...

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