NDLI: Fixed filter implementation of feedback cancellation for in-the-ear hearing aids

Content Provider	IEEE Xplore Digital Library
Author	Woodruff, B.D. Preves, D.A.
Copyright Year	1995
Description	Author affiliation: Argosy Electron. Inc., Eden Prairie, MN, USA (Woodruff, B.D.; Preves, D.A.)
Abstract	Acoustic feedback oscillation in hearing aids is a problem which often prevents an adequate amount of gain from being realized for some hearing aid users. A study is presented in which a feedback cancellation technique is applied to hearing aids in 13 ears. The technique consists of modeling the feedback path around the amplifier and duplicating it with an FIR (finite impulse response) filter. The output of this filter is inverted and summed with the input signal at the input to the amplifier, canceling the signal from the feedback path around the amplifier. This technique is applied in its most optimized form and also in several variations of a simplified form. The optimized form employs a long floating point FIR filter which is generated from the impulse response of each specific subject's feedback path around the amplifier. These feedback paths include the microphone and receiver responses in a vented in-the-ear (ITE) earmold. Comparisons between feedback path transfer functions are shown to reveal that the phase responses are quite similar, but that the magnitude responses are not. An FIR filter is constructed which is an average of the 13 measured impulse responses. This FIR is implemented in three forms: a long floating point FIR filter, a short floating point FIR filter, and a short fixed point FIR filter. All three are shown to be effective in reducing feedback, provided the overall gain of the filter may be increased or decreased in order to optimally suit the magnitude response of the filter to the needs of each person's ear. Using this technique a fixed filter may be implemented in ITE hearing aids for all hearing aid wearers to allow more gain without feedback oscillation.
Starting Page	22
Ending Page	23
File Size	163335
Page Count	2
File Format	PDF
ISBN	0780330641
DOI	10.1109/ASPAA.1995.482904
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1995-10-15
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Hearing aids Finite impulse response filter Microphones Auditory system Ear Acoustic measurements Output feedback Transfer functions Feedback loop Phase measurement
Content Type	Text
Resource Type	Article

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
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8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

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