Apparatus for and method of performing high frequency audiometry

Details Apparatus for and method of performing high frequency audiometry Apparatus for and method of performing high frequency audiometry

1988-02-16

1992-04-21

Cohen, Lee S.

Surgery

Truss

Pad

73585, 73587, A61B 500

Patent

active

051058227

ABSTRACT:
An apparatus for and method of applying a selected range of high frequency acoustic energy to the apical end of the eardrum of an ear canal at a predetermined, substantially absolute sound pressure level at any frequency in the range of interest. The selected range of frequencies is generated at a location remote from the ear canal and the sound pressure level of each frequency is varied at the time of generation in accordance with a calibration function to ensure the frequencies reaching the apical end of the eardrum are at the predetermined sound pressure level.
The calibration function is calculated by transmitting an acoustic pulse of broad frequency spectrum into the ear canal, measuring the sound pressure of the transmitted acoustic pulse and reflection thereof adjacent the entrance of the ear canal, and removing from the spectrum of the measured sound pressure the destructive interference effects between the transmitted and reflected acoustic pulses. The resultant sound pressure level contains nonuniformities having information regarding the sound transmission characteristics of the ear canal and the acoustic pulse generation and transmission system from which the calibration function is calculated.

REFERENCES:
patent: 4601295 (1986-07-01), Teele
Green et al., "High Frequency Audiometric Assessment of a Young Adult Population", Feb. 1987.
Stevens et al., "Calibration of Ear Canals for Audiometry at High Frequencies", Feb. 1987.

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