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 ?
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.
The immittance findings supported the extent of extracranial complications identified on otoscopic examination.
Jerger believes that with an air-bone gap, the entire immittance battery cannot be normal (J.
Immittance audiometry was conducted with the GSI Tympstar, and distortion product otoacoustic emissions (DPOAEs) were collected at WRAMC using the GSI Audera and at NCRAR using the Mimosa Acoustics HearID systems (Champaign, Illinois).
He presents 17 chapters covering acoustics and sound measurement, anatomy and physiology of the auditory system, measurement principles and the nature of hearing, the audiometer and test environment, pure tone audiometry, auditory system and related disorders, acoustic immittance assessment, speech audiometry, clinical masking, behavioral tests for audiological diagnosis, physiological methods in audiology, assessment of infants and children, audiological screening, nonorganic hearing loss, audiological management, and effects of noise and hearing conservation.
Tympanometry measures the mechanoacoustic properties of the external-middle ear system in terms of acoustic immittance (expressed in mm [H.
A comprehensive audiometric evaluation should be completed, including otoscopy, air- and bone-conduction thresholds, immittance audiometry, ipsilateral and contralateral acoustic reflex thresholds, and contralateral acoustic reflex decay.
The audiometric findings, especially the absence of acoustic stapedial reflexes on acoustic immittance testing, were consistent with otosclerosis.
Patients saw the audiology consult service and underwent immittance and pure tone audiometric evaluations.
Findings on audiologic testing--including speech, speech-in-noise, acoustic immittance, and oto-acoustic emissions studies--were within normal limits.
Normal middle-ear function was verified by means of immittance measures.
To obtain impedance measurements in both patients, we used a GS133 immittance bridge and a 226-Hz probe tone for tympanometry.