Results 221 to 230 of about 21,616 (265)
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Acoustical Impedance of Enclosures
The Journal of the Acoustical Society of America, 1947Formulas are derived for the acoustical impedance of three types of enclosures, a sphere, a cylinder, and a narrow rectangular box. The solutions are valid throughout the entire range from adiabatic to isothermal conditions.
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Acoustic Input Impedance of the Human Ear
Acta Oto-Laryngologica, 1966An objective method of measuring the vibrations of the tympanic membrane by means of an improved capacitive-probe system is described. The device has a dynamic range up to 7500 A over the whole audiofrequency range. A new probe tip was developed, serving for conduction of the modulated H.F. signal as well as for the sound transmission.
H, Fischler +4 more
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Effect of the Acoustic Reflex on the Impedance at the Eardrum
Journal of Speech and Hearing Research, 1965Seventeen ears of 12 subjects with normal hearing were tested in both a laboratory and a clinical setting to study impedance changes in normal human ears associated with the acoustic reflex. Compliance and resistance at the eardrum were measured with middle ear muscles relaxed and contracted by means of a contralateral noise stimulus, respectively.
A S, Feldman, J, Zwislocki
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Measurement of Acoustic Impedance
The Journal of the Acoustical Society of America, 1948In this paper a method is described of measuring the acoustic impedance of a sample of material forming one boundary of a shallow cylindrical cavity, by determining the sound pressure produced when a known volume current is injected into the cavity from a high impedance source. The volume current is effectively determined by observing the pressure when
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Acoustic waves and their effects on antenna impedance
1966 Antennas and Propagation Society International Symposium, 1967Expressions have been derived for the terminal admittance of a biconical dipole encased in a dielectric sphere which is immersed in a warm plasma. A linearized hydrodynamic description is used for the plasma. For thin-angle cones an exact expression is derived.
J. Carlin, R. Mittra
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Acoustic Impedance Studies of the Normal Ear
Journal of Speech and Hearing Research, 1967Repeated measurements of the acoustic impedance at the eardrum were performed on 33 normal subjects. The data are analyzed from the standpoint of the development of criteria for the compliance and resistance parameters of normal impedance as well as ear canal volume measurements.
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Specific acoustic impedance of enamel and dentine
Archives of Oral Biology, 1968Abstract Specific acoustic impedance (SPI) is a characteristic property of matter like elasticity and density to which it is related. A new method for determining longitudinal wave SPI has been employed on enamel and dentine of bovine incisors. The reflection ratio which is the ratio of the reflected pressure amplitude to that of the incident sound ...
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The Acoustical Impedance of an Infinite Hyperbolic Horn
The Journal of the Acoustical Society of America, 1940In discussing the acoustical properties of horns, it is in general a mathematical necessity to assume plane waves. In the case of a horn in the form of an hyperboloid of one sheet, however, it is possible to avoid this assumption and to obtain an exact solution to the problem.
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