Surgery – Diagnostic testing – Ear or testing by auditory stimulus
Patent
1996-01-23
1999-03-23
Jaworski, Francis J.
Surgery
Diagnostic testing
Ear or testing by auditory stimulus
73585, A61B 500
Patent
active
058852255
ABSTRACT:
A system and method for using double-evoked otoacoustic emission (2EOAE) signals to elicit an evoked response from the cochlea. A three sample stimulus includes a first signal, a time delayed second signal and the superposition of the first and second signals. The time delay is selected to be less than the maximum latency of the cochlear emission. Each of the three signals elicits a response from the cochlea that include a linear response. The linear response is eliminated by subtracting the response to the first and second individual signals from the response to the superposition signal. One class of signals arises when the time delayed signal is a scaled version of the first signal. The signals can include click signals, chirp signal and the like. Chirp signals can be used to mimic classical distortion product (DP) responses. The signals may be presented using a single acoustic source or separate acoustic sources. With the appropriate selection of time delays, the 3 signal stimulus can greatly reduce nonlinear response due to probe distortion. With two acoustic sources, probe distortion can be virtually eliminated. The system also includes a noise coherence measurement to determine the relative levels of system response caused by random noise as opposed to nonlinear response. A real-time artifact rejection technique also simplifies the collection of data.
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Keefe Douglas H.
Ling Robert
Boys Town National Research Hospital
Jaworski Francis J.
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