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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 previewEncyclopaedia perthensis, or, Universal dictionary of the arts, sciences, literature, etc. : intended to supersede the use of other books of reference (1816)

Acoustic Duct, in anatomy, the meatut auditorial, or external passage of the ear. See A- HATOMY. Acoustic Instrument, or Auricular tube. See Acoustics. Acoustic Medicines, remedies against ...

Google previewEncyclopaedia Londinensis, or, Universal dictionary of arts, sciences, and literature (1810)

by John Wilkes (of Milland House, Sussex)

Acoustic Duct, in anatomy, the fame with meatus auditorius, or the external passage of the ear. Acoustic Vessels, in the ancient theatres, were a kind of vessels, made of brass, soaped in the bell fashion, which, being of all tones within the pitch ...

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 Anatomy. Acoustic Instrument, or auricular tube. See Acoustics. Acoustic Vessels, in the ancient theatres, were a kind of vessels made of ...

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 auditories, or the external passage < f the ear. Acoustic Nerves. See Auditor v Nerves, Anatomy, Div. ii. Acoustic Vessels, vessels made of brass, shaped like a bell, and used in the ancient ...

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 previewThe London encyclopaedia (1829)

or Universal dictionary of science, art, literature, and practical mechanics, comprising a popular view of the present state of knowledge

Acoustic Duct, in anatomy, the meatus audi- torius, or external passage of the ear. See Anatomy. Acoustic Instrument, or auricular tube, See Acoustics. Acoustic Medicines, remedies against imperfections and disorders of the ...

Google previewENCYCLOPAEDIA BRITANNICA; Or, A DICTIONARY of Arts and Sciences, Compiled Upon a New Plan. In Wich the Different Science and Arts are Digested Into Distinct Treatises Or Systems; and The Various Technical Terms, ... are Explained as They Occur in the Order of the Alphabet. Illustrated with One Hundred and Sixty Copperplates, by a Society of Gentlemen in Scotland. IN THREE VOLUMES. Edinburgh: Printed for A. Bell and C. Macfarquhar; and Fold by Colin Macfarquhar, at this Printing-office, Nicolson Street. M.D.CC.LXXI. (1771)

1: [AB-BYZ].

AcousTic duct, in anatomy, the same with meatus auditorius, or the external passage os the ear.

Google previewEncyclopaedia Metropolitana; Or, Universal Dictionary of Knowledge on an Original Plan Comprising the Twofold Advantage of a Philosophical and an Alphabetical Arrangement, with Appropriate Engravings Edited by Edward Smedley, Hugh James Rose, Henry John Rose (1845)

Miscellaneous and lexicographical, vol. 1

ACOUSTIC Duct, in Anatomy, the same with meatloauditoriua, or the external passage of the ear. Acousrtc Nerves. See Aum'ronv Nsnvas, ANATOMY. Div. ii. Acousrlc Vessels, vessels made of brass, shaped like a bell, and used in the ancient ...

Google previewLexicon Medicum, Or, Medical Dictionary (1845)

Containing an Explanation of the Terms in Anatomy, Botany, Chemistry, Materia Medica, Midwifery, Mineralogy, Pharmacy, Physiology, Practice of Physic, Surgery, and the Various Branches of Natural Philosophy Connected with Medicine ... by Robert Hooper

Acoustic duct. See.Meatus auditorius. AcRae'ralos. See Acraipala. AcRai Pala- ( Akpaaraaos. From a neg and spatmaxn, surfeit.) Remedies for the effects of a debauch AcRA's A. (From a, and kepaw, to mix.). Unhealthiness; intemperance.

Google previewEncyclopædia metropolitana; or, Universal dictionary of knowledge, ed. by E. Smedley, Hugh J. Rose and Henry J. Rose. [With] Plates (1845)

by Edward Smedley

Acoustic Duct, in Anatomy, the same with neatut auditorins, or the external passage of the ear. Acoustic Nerves. See Auditory Nerves, Ana- tomy, Div. ii.

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 auditoriwt, or the external passage of the ear. Acoustic Nerves. See Auditory Nerves, Anatomy, Div. ii. Acoustic Vessels, vessels made of brass, shaped like a bell, and used in the ancient ...

Google previewThe Cyclopædia, Or, Universal Dictionary of Arts, Sciences, and Literature (1819)

by Abraham Rees

AcousTic Duct, in Anatomy, is applied to the external passage of the EAR 3 called also MEATUS audiforius. ACoUsTIc Instruments, or Auricular tubes, are such as are adapted to supply the defect of HEARXNG. See also DearNESS and ...

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