Method and apparatus for intracranial noise suppression

Electrical audio signal processing systems and devices – Acoustical noise or sound cancellation – Adjacent ear

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433 27, 381 72, A61F 1106, H03B 2900

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active

055704263

ABSTRACT:
A method and apparatus for active cancellation of vibrational noise produced by a medical instrument in the head of a patient. Vibrations from the instrument, as well as vibrations in the bone structure in the head of the patient, are sensed and processed to generate cancelling noise waves which are then fed into the inner ear through headphones or through vibrators placed on the head of the patient. An equalizer shapes the magnitude and phase spectrum of the vibrational signal picked up from the drill and delivers the equalized signal to the patient. An automatic adaptive controller adjusts the equalizer using control signals consisting of vibrations from the bone structure and the drill.

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