Hearing aid with compensation of acoustic and/or mechanical feed

Details Hearing aid with compensation of acoustic and/or mechanical feed Hearing aid with compensation of acoustic and/or mechanical feed

1998-06-04

2000-10-03

Kuntz, Curtis A.

Electrical audio signal processing systems and devices

Hearing aids, electrical

Noise compensation circuit

381314, H04R 2500

Patent

active

061283924

ABSTRACT:
A hearing aid has a microphone (1), or other electromechanical transducer, for converting an acoustic input signal into an electrical signal, a signal-processing and amplifying signal path (2, 3, 13, 4, 5, 6) and an output converter (7) which converts the amplified electrical signals back into acoustic signals, or in the case of an implanted hearing aid into mechanical signals, and a feedback digital finite impulse response filter (FIR filter) (9) for compensation of unwanted feedback (8) from the output converter to the microphone, in which the filter coefficients of filter (9) are determined by feeding a short pulse into the feedback signal path (5, 6, 7, 1, 2) and directly measuring the impulse response of this signal path.

REFERENCES:
patent: 5111419 (1992-05-01), Morley, Jr. et al.
patent: 5259033 (1993-11-01), Goodings et al.
patent: 5475759 (1995-12-01), Engebretson
patent: 5621802 (1997-04-01), Harjani et al.
Roland Best, Digitale Filter, Handbook of Analog and Digital Filtering Engineering, pp. 97-113.
DFS-EIN Neues Digitales System Zur Ruckkopplungsunterdruckung in Horgeraten, Ruckkopplungs-Unterdruckung, Nikolai Bisgaard, Ole Dyrlund, Audiologische Akustik, May 1991, pp. 166-175.

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