Electrical audio signal processing systems and devices – Hearing aids – electrical – Noise compensation circuit
Patent
1997-11-18
2000-06-06
Kuntz, Curtis A.
Electrical audio signal processing systems and devices
Hearing aids, electrical
Noise compensation circuit
381 7111, 381 93, 381 718, H04R 2500
Patent
active
060728841
ABSTRACT:
Feedback cancellation apparatus uses a cascade of two filters along with a short bulk delay. The first filter is adapted when the hearing aid is turned on in the ear. This filter adapts quickly using a white noise probe signal, and then the filter coefficients are frozen. The first filter models parts of the hearing-aid feedback path that are essentially constant over the course of the day. The second filter adapts while the hearing aid is in use and does not use a separate probe signal. This filter provides a rapid correction to the feedback path model when the hearing aid goes unstable, and more slowly tracks perturbations in the feedback path that occur in daily use. The delay shifts the filter response to make the most effective use of the limited number of filter coefficients.
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AudioLogic Hearing Systems LP
Bales Jennifer L.
Harvey Dionne N.
Kuntz Curtis A.
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