immittance


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Immittance

The impedance or admittance of an alternating-current circuit. It is sometimes convenient to use the term immittance when referring to a complex number which may be either the impedance (ratio of voltage to current) or the admittance (ratio of current to voltage) of an electrical circuit. The units of impedance and admittance are, of course, different and so units cannot be assigned to an immittance. However, in certain theoretical work it may be necessary to deal with general functions which afterward will be specialized to become either an impedance or an admittance by the assignment of suitable units; in such cases it is convenient to refer to the functions as immittances. See Admittance, Electrical impedance

immittance

[i′mit·əns]
(electricity)
A term used to denote both impedance and admittance, as commonly applied to transmission lines, networks, and certain types of measuring instruments.
References in periodicals archive ?
The aims of this study were to summarize the clinical manifestations and audiological characteristics of AN, to explore the roles of pure tone audiometry, acoustic immittance test, auditory brainstem response test and distortion product (DP) otoacoustic emission test in AN diagnosis, to investigate whether AN was complicated with vestibular function disorders or other nervous system diseases, and importantly, to provide valuable evidence for future clinical and experimental studies on AN.
of British Columbia) would like to hasten the application of acoustic immittance measure by explaining to practitioners and instructors both the older familiar versions and the recently developed wideband version, also called wideband reflectance and wideband tympanometry.
Boukamp, B, "A Nonlinear Least Squares Fit Procedure for Analysis of Immittance Data Electrochemical Systems.
Acoustic immittance measurements were obtained using a Handtymp middle ear analyzer (Damplex, Copenhagen, Denmark).
This has received very little attention in the area of cleft care although research shows that hearing impairment affects language development The present study was carried not to find out the type and pattern of audiogram in cases attending a speech camp, average degree of hearing loss and its relation to the side of cleft, and the acoustic immittance findings and its relation to the otological evaluation.
The NTK output files contain all necessary output design information such as immittance inverter summary (coupling bandwidths), resonant element values and coupling matrix.
If immittance testing is performed, screening at 500 Hz can be omitted (ASHA, 1997).
In some cases, instilling mineral oil into the EAC removed the cerumen, then audiometric and immittance screenings were conducted.
For children under 1 year of age, standard immittance audiometry is not feasible; however, a technique known as acoustic otoscopy or acoustic reflectometry can be used for these difficult-to-test children (Teele & Teele, 1984).
Reorganized, this edition has four new chapters: outer and middle ear assessment, with a new section on otoscopy, more on the use of different immittance probe-tone frequencies, and a section on the use of wideband acoustic immittance; evoked physiological responses, with more information and examples on the use of otoacoustic emissions, auditory brainstem responses, and auditory steady-state responses for assessing neural pathologies and auditory sensitivity; implantable devices; and the vestibular system.
Tenders are invited for Handheld Diagnostic Immittance Meter