Lattice adaptive filtering-based method for acoustic feedback cancellation in hearing aids with robustness against sudden changes in the feedback path

Muhammad Tahir Akhtar, Akinori Nishihara

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

1 Citation (Scopus)

Abstract

This paper proposes a new method for continuous acoustic adaptive feedback cancelation (AFC) in digital hearing aids. The proposed method employs two adaptive filters working in tandem. The first adaptive filter is excited by the receiver (output) signal of the hearing aid, and uses microphone signal as its desired response. The lattice-predictor based adaptive algorithm is used to updated the coefficients of the first adaptive filter. The second adaptive filter is excited by a (random) probe signal. We propose coefficient monitoring strategy with two fold objectives: 1) both adaptive filters converge to a good estimate of the acoustic feedback path, and that 2) both adaptive filter are re-initialized when a sudden change in the acoustic feedback path is detected. Finally, the injected probe noise is controlled via time-varying gain in such a way that a low level noise is used when the system is operating in its steady state. Simulation results demonstrate that the proposed method achieves good modeling accuracy, preserves good speech quality, and provides robust performance for the sudden changes in acoustic feedback path.

Original languageEnglish
Title of host publication2017 8th International Workshop on Signal Design and Its Applications in Communications, IWSDA 2017
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages59-63
Number of pages5
ISBN (Electronic)9781509065332
ISBN (Print)9781509065332
DOIs
Publication statusPublished - Nov 3 2017
Event8th International Workshop on Signal Design and Its Applications in Communications, IWSDA 2017 - Sapporo, Japan
Duration: Sep 24 2017Sep 28 2017

Publication series

Name2017 8th International Workshop on Signal Design and Its Applications in Communications, IWSDA 2017

Conference

Conference8th International Workshop on Signal Design and Its Applications in Communications, IWSDA 2017
CountryJapan
CitySapporo
Period9/24/179/28/17

Keywords

  • acoustic feedback
  • Hearing aids
  • Lattice-predictor NLMS algorithm
  • NLMS algorithm
  • probe noise

ASJC Scopus subject areas

  • Signal Processing
  • Computer Networks and Communications

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    Akhtar, M. T., & Nishihara, A. (2017). Lattice adaptive filtering-based method for acoustic feedback cancellation in hearing aids with robustness against sudden changes in the feedback path. In 2017 8th International Workshop on Signal Design and Its Applications in Communications, IWSDA 2017 (pp. 59-63). [8095736] (2017 8th International Workshop on Signal Design and Its Applications in Communications, IWSDA 2017). Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/IWSDA.2017.8095736