Method and apparatus for distortion product emission testing of

Details Method and apparatus for distortion product emission testing of Method and apparatus for distortion product emission testing of

1996-06-13

1997-09-09

Hayes, Gail O.

Surgery

Truss

Pad

G06G 760

Patent

active

056645775

ABSTRACT:
Apparatus and method for the recording of distortion product emission (DPE) levels in human beings. At least one microphone and a sound-delivery system is inserted in the external ear canal. Two primary tones T.sub.f1, T.sub.f2 are applied simultaneously to the ear. The cochlea of the inner ear produces a DPE tone which is sensed by the microphone. DPE levels are sensed as a function of input frequencies f.sub.1 and f.sub.2. Such DPE frequency is equal to 2f.sub.1 -f.sub.2. Such DPE frequencies are collected in 100 Hz step by adjusting f.sub.1 and f.sub.2 and maintaining a substantially constant ratio between f.sub.1 and f.sub.2. Two output forms are created: an DPE audiogram and a DPE input/output function. Noise picked up is reduced by averaging the DPE signals many times, yet causing each of the DPE signals that is averaged to be of the same phase a every other DPE signal. Random phase noise is reduced by the averaging process. Body noise may be reduced by using two microphones and applying the output of one such microphones to the plus input of a differential amplifier. The output of such amplifier results with the body noise signal substantially reduced, but with the DPE signal substantially unchanged.

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