On employing cascaded adaptive filters for acoustic feedback neutralization in digital hearing aids

Muhammad Tahir Akhtar, Akinori Nishihara

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

In this paper, we propose a novel solution for continuous acoustic feedback neutralization in digital hearing aids. The proposed method is based on two adaptive filters working in tandem. The error signal of the first adaptive filter is used as a desired response for the second adaptive filter, which is excited by a low-level (constant) probe signal. Initially at the start up, the first adaptive filter gives fast convergence, however, it may converge to a biased solution in steady state because its input and desired response are correlated with each other. On the other hand, the second adaptive filter, though converging slowly being excited by a low-level probe signal, would give good estimate of the acoustic feedback path in steady state. In order to avoid the misconvergence of the first adaptive filter and speed up the initial convergence of the second one, their weights are exchanged, making sure that both adaptive filters give good estimate of acoustic feedback path. Computer simulations suggest the improved performance of the proposed method.

Original languageEnglish
Title of host publication54th IEEE International Midwest Symposium on Circuits and Systems, MWSCAS 2011
DOIs
Publication statusPublished - Oct 13 2011
Event54th IEEE International Midwest Symposium on Circuits and Systems, MWSCAS 2011 - Seoul, Korea, Republic of
Duration: Aug 7 2011Aug 10 2011

Publication series

NameMidwest Symposium on Circuits and Systems

Conference

Conference54th IEEE International Midwest Symposium on Circuits and Systems, MWSCAS 2011
CountryKorea, Republic of
CitySeoul
Period8/7/118/10/11

Fingerprint

Hearing aids
Adaptive filters
Acoustics
Feedback
Computer simulation

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering

Cite this

Akhtar, M. T., & Nishihara, A. (2011). On employing cascaded adaptive filters for acoustic feedback neutralization in digital hearing aids. In 54th IEEE International Midwest Symposium on Circuits and Systems, MWSCAS 2011 [6026688] (Midwest Symposium on Circuits and Systems). https://doi.org/10.1109/MWSCAS.2011.6026688

On employing cascaded adaptive filters for acoustic feedback neutralization in digital hearing aids. / Akhtar, Muhammad Tahir; Nishihara, Akinori.

54th IEEE International Midwest Symposium on Circuits and Systems, MWSCAS 2011. 2011. 6026688 (Midwest Symposium on Circuits and Systems).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Akhtar, MT & Nishihara, A 2011, On employing cascaded adaptive filters for acoustic feedback neutralization in digital hearing aids. in 54th IEEE International Midwest Symposium on Circuits and Systems, MWSCAS 2011., 6026688, Midwest Symposium on Circuits and Systems, 54th IEEE International Midwest Symposium on Circuits and Systems, MWSCAS 2011, Seoul, Korea, Republic of, 8/7/11. https://doi.org/10.1109/MWSCAS.2011.6026688
Akhtar MT, Nishihara A. On employing cascaded adaptive filters for acoustic feedback neutralization in digital hearing aids. In 54th IEEE International Midwest Symposium on Circuits and Systems, MWSCAS 2011. 2011. 6026688. (Midwest Symposium on Circuits and Systems). https://doi.org/10.1109/MWSCAS.2011.6026688
Akhtar, Muhammad Tahir ; Nishihara, Akinori. / On employing cascaded adaptive filters for acoustic feedback neutralization in digital hearing aids. 54th IEEE International Midwest Symposium on Circuits and Systems, MWSCAS 2011. 2011. (Midwest Symposium on Circuits and Systems).
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