Measuring and testing – Vibration – By mechanical waves
Patent
1995-05-26
1997-01-14
Chilcot, Richard
Measuring and testing
Vibration
By mechanical waves
73589, 128746, A61B 512
Patent
active
055941745
ABSTRACT:
A system and method of measuring the linear and nonlinear response of an unknown acoustic termination uses a small probe assembly containing a sound source and microphone to determine the reflection function of the unknown acoustic termination. The probe assembly is used with a calibration tube to calculate an electrical signal that will provide a desired acoustic stimulus signal to the acoustic termination. The calibration tube is also used to characterize the signal processing properties of the sound source and microphone, as well as other associated signal processing circuits such as amplifiers, filters, and the like. The calibrated system is subsequently coupled to the unknown acoustic termination to deliver the acoustic stimulus signal. The reflection function is indicative of the power transferred to the unknown acoustic termination. The measurement of the linear transfer characteristic is applicable to any unknown acoustic termination such as a musical instrument or the auditory system. The probe assembly is sized to be positioned directly within the outer portion of the ear and measure the linear characteristics of the ear. The system is further able to measure the nonlinear transfer characteristics of the ear by measuring the linear response at multiple levels of the acoustic stimulus. The system is particularly useful in testing the response of the middle ear and inner ear of humans or other animals.
REFERENCES:
patent: 4079198 (1978-03-01), Bennett
patent: 4289143 (1981-09-01), Canavesio et al.
patent: 4374526 (1983-02-01), Kemp
patent: 4459996 (1984-07-01), Teele
patent: 4601295 (1986-07-01), Teele
patent: 4809708 (1989-03-01), Geisler et al.
patent: 4884447 (1989-12-01), Kemp et al.
patent: 5063946 (1991-11-01), Wada
patent: 5105822 (1992-04-01), Stevens et al.
Rabinowitz, William M., "Measurement of the acoustic input immittance of the human ear.sup.a) ", J. Acoustical Society of America 70(4):1025-1035, 1981 (Oct. 1981).
Biarge, Victoria Rodellar and Pedro Gomez Vilda., "Experimental system for registering and processing the stimulated emissions from within the Auditory System in the characterization of its Transmission Pattern., " IEEE 1:25-28, 1985 (Oct. 1985).
Stevens, Kenneth N. et al., "Calibration of ear canals for audiometry at high frequencies", J. Acoustical Society of America, 81:470-84, 1987 (Feb. 1987).
Whitehead, M. L., B. B. Stagner, Brenda L. Lonsbury-Martin and Glen K. Martin, "Measurement of Otoacoustic Emissions For Hearing Assessment," IEEE Engineering in Medicine and Biology 13:210-226, 1994 (May 1994).
P. Bray, "Click evoked otoacoustic emissions and the development of a clinical otoacoustic hearing test instrument," doctoral dissertation, University of London, London, England, 1989 (Jun. 1989).
I. Blood et al., "Acoustic Otoscopic Measures in Toddler Population," Poster presented at the American Speech Language Hearing Association, Seattle, Washington, Nov., 1990 (Nov. 1990).
D. Keefe et al., "Method to measure acoustic impedance and reflection coefficient," J. Acoust. Soc. Am 91(1): 470-485, 1992 Jan. 1992).
D. Jurzitza and W. Hemmert, "Quantitative Measurements of Simultaneous Evoked Otoacoustic Emissions," Acustica, 77:93-99, 1992 (Apr. 1992).
M. Joswig, "Impulse Response Measurement of Individual Ear Canals and Impedances at the Eardrum in Man," Acustica, 77:270-282, 1993 (Apr. 1993).
C. Shera and G. Zweig, "Noninvasive measurement of the cochlear traveling-wave ratio," J. Acoust. Soc. Am. 93(6): 3333-3352, 1993 (Jun. 1993).
D. Keefe et al., "Ear-canal impedance and reflection coefficient in human infants and adults," J. Acoust. Soc. Am. 94(5): 2617-2638, 1993 (Nov. 1993).
P. Dallos, "On the Generation of Odd-Fractional Subharmonics," J. Acoust. Soc. Am., 40:1381-1391, 1966 (Nov. 1966).
P. Dallos. The Auditory Periphery, Academic Press, U.S.A., 1973 pp. 448-464, 1973.
J. P. Wilson and J. R. Johnstone, "Basilar membrane and middle-ear vibration in guinea pig measured by capacitive probe," J. Acoust. Soc. Am., 57:705-723, 1975. (Mar. 1975).
P. M. Zurek. "Acoustic emissions from the ear: A summary of results from humans and animals," J. Acoust. Soc. Am., 78:340-344, 1985 (Jul. 1985).
Chilcot Richard
Noori Max H.
University of Washington
LandOfFree
System and method for measuring acoustic reflectance does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with System and method for measuring acoustic reflectance, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and System and method for measuring acoustic reflectance will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1389648