Measuring and Modeling Basic Properties of the Human Middle Ear and Ear Canal. Part III: Eardrum Impedances, Transfer Functions and Model Calculations
In this third (and final) part of the series on middle ear properties further measurements on temporal bone preparations are presented, some calculations using the one-dimensional model are derived, and a complete description of the model (quantifying all the element values) is given. The results provided in this part refer to systems of the middle ear which comprise more than one subsystem, as specified in the preceding parts. The eardrum impedance under different load conditions and several transfer functions in both directions (from the ear canal to the vestibule, and from the stapes footplate to the ear canal) are measured. The measurements presented in this part can be considered as being redundant, because it was already possible to calculate them from the results of part II. Actually all the measurements were combined to derive the element values of our circuit model. The circuit model allows many more functions and quantities to be calculated than can be presented in this paper. A selection of functions describing the "quality" of the middle ear (power relationships and transfer functions), also in combination with the outer ear, is discussed. The complete set of model parameters is collected in an appendix. The appendix will enable anybody who is interested in the model to implement the circuit model in a fairly simple computer program.
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Document Type: Research Article
Publication date: November 1, 1998
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- Acta Acustica united with Acustica, published together with the European Acoustics Association (EAA), is an international, peer-reviewed journal on acoustics. It publishes original articles on all subjects in the field of acoustics, such as general linear acoustics, nonlinear acoustics, macrosonics, flow acoustics, atmospheric sound, underwater sound, ultrasonics, physical acoustics, structural acoustics, noise control, active control, environmental noise, building acoustics, room acoustics, acoustic materials, acoustic signal processing, computational and numerical acoustics, hearing, audiology and psychoacoustics, speech, musical acoustics, electroacoustics, auditory quality of systems. It reports on original scientific research in acoustics and on engineering applications. The journal considers scientific papers, technical and applied papers, book reviews, short communications, doctoral thesis abstracts, etc. In irregular intervals also special issues and review articles are published.
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