Hearing faculty testing and apparatus therefor

Details Hearing faculty testing and apparatus therefor Hearing faculty testing and apparatus therefor

A - Human Necessities

61

B

349/28

A61B 5/12 (2006.01)

Patent

CA 1146659

Abstract of the Disclosure A hearing faculty test and apparatus therefor is based on the finding that sound input to the ear gives rise to a returned wave from and related to the condition of the inner ear, this wave being detectable as an echo from the ear drum. The apparatus pre- ferably comprises a sealing aural probe housing transducers respectively to project a repetitive transient sound by pulse generator activation and to pick-up for detection successive echoes by time-gating. Detected echoes are preferably averaged during processing for display. The echo occurs about 5-20 ms after its sound and a maximum operating frequency of about 50 Hz is appropriate. A continuous sound input can be used with conse- quent echo interference detectable as rapid changes of acoustic impedance with sound input frequency. Another alternative can involve detection of the ear drum movement by returned waves.

320823

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