Sound Quality Improvement for Hearing Aids in Presence of Multiple Inputs

Dr. Asutosh Kar, Ankita Anand, Jan Østergaard, Søren Holdt Jensen, M.N.S. Swamy

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Modern-day hearing aids are capable of receiving acoustic signals over a wireless link and also from the surroundings through the microphone. If the hearing aid receives input only from the acoustic environment, feedback cancellation proceeds according to the existing methodologies for bias reduction. However, the wirelessly received signal and the acoustic environment input, when emitted from the same source, can be very similar to each other or with a time-delayed version of each other, thereby having a high correlation between them. Both inputs can also be emitted from different sources and, thus, be less correlated with each other. In the aforementioned scenarios, acoustic confusion can occur for the user as the hearing aid receives both signals simultaneously. To improve the output signal quality and to reduce bias in an adaptive feedback cancellation system with a wirelessly received signal as well as an acoustic environment input, we propose a cost function, and the optimization of the feed-forward path and of the shaping filter for the wireless signal. The feed-forward path is designed to be a cascade of the required acoustic enhancement along with an FIR filter. We derive expressions for an optimum shaping filter and for an optimized feed-forward path. Improvement in loudspeaker output signal quality, normalized misalignment and maximum stable gain for each of the above-mentioned scenarios is assessed through numerical simulations.

Original languageEnglish
JournalCircuits, Systems and Signal Processing
Volume38
Issue number8
Pages (from-to) 3591–3615
Number of pages25
ISSN0278-081X
DOIs
Publication statusPublished - 15 Aug 2019

Fingerprint

Hearing aids
Quality Improvement
Acoustics
Acoustic waves
Feedforward
Cancellation
Path
Feedback
Loudspeakers
Filter
Bias Reduction
FIR Filter
FIR filters
Scenarios
Microphones
Output
Misalignment
Cost functions
Telecommunication links
Sound

Keywords

  • Adaptive filters
  • Convergence rate
  • Feedback cancellation
  • Hearing aid
  • Misalignment

Cite this

@article{b385e83ae2a94790b4f575ea9fea64b7,
title = "Sound Quality Improvement for Hearing Aids in Presence of Multiple Inputs",
abstract = "Modern-day hearing aids are capable of receiving acoustic signals over a wireless link and also from the surroundings through the microphone. If the hearing aid receives input only from the acoustic environment, feedback cancellation proceeds according to the existing methodologies for bias reduction. However, the wirelessly received signal and the acoustic environment input, when emitted from the same source, can be very similar to each other or with a time-delayed version of each other, thereby having a high correlation between them. Both inputs can also be emitted from different sources and, thus, be less correlated with each other. In the aforementioned scenarios, acoustic confusion can occur for the user as the hearing aid receives both signals simultaneously. To improve the output signal quality and to reduce bias in an adaptive feedback cancellation system with a wirelessly received signal as well as an acoustic environment input, we propose a cost function, and the optimization of the feed-forward path and of the shaping filter for the wireless signal. The feed-forward path is designed to be a cascade of the required acoustic enhancement along with an FIR filter. We derive expressions for an optimum shaping filter and for an optimized feed-forward path. Improvement in loudspeaker output signal quality, normalized misalignment and maximum stable gain for each of the above-mentioned scenarios is assessed through numerical simulations.",
keywords = "Adaptive filters, Convergence rate, Feedback cancellation, Hearing aid, Misalignment",
author = "Kar, {Dr. Asutosh} and Ankita Anand and Jan {\O}stergaard and Jensen, {S{\o}ren Holdt} and M.N.S. Swamy",
year = "2019",
month = "8",
day = "15",
doi = "10.1007/s00034-019-01104-2",
language = "English",
volume = "38",
pages = "3591–3615",
journal = "Circuits, Systems and Signal Processing",
issn = "0278-081X",
publisher = "Springer",
number = "8",

}

Sound Quality Improvement for Hearing Aids in Presence of Multiple Inputs. / Kar, Dr. Asutosh; Anand, Ankita; Østergaard, Jan; Jensen, Søren Holdt; Swamy , M.N.S. .

In: Circuits, Systems and Signal Processing, Vol. 38, No. 8, 15.08.2019, p. 3591–3615.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Sound Quality Improvement for Hearing Aids in Presence of Multiple Inputs

AU - Kar, Dr. Asutosh

AU - Anand, Ankita

AU - Østergaard, Jan

AU - Jensen, Søren Holdt

AU - Swamy , M.N.S.

PY - 2019/8/15

Y1 - 2019/8/15

N2 - Modern-day hearing aids are capable of receiving acoustic signals over a wireless link and also from the surroundings through the microphone. If the hearing aid receives input only from the acoustic environment, feedback cancellation proceeds according to the existing methodologies for bias reduction. However, the wirelessly received signal and the acoustic environment input, when emitted from the same source, can be very similar to each other or with a time-delayed version of each other, thereby having a high correlation between them. Both inputs can also be emitted from different sources and, thus, be less correlated with each other. In the aforementioned scenarios, acoustic confusion can occur for the user as the hearing aid receives both signals simultaneously. To improve the output signal quality and to reduce bias in an adaptive feedback cancellation system with a wirelessly received signal as well as an acoustic environment input, we propose a cost function, and the optimization of the feed-forward path and of the shaping filter for the wireless signal. The feed-forward path is designed to be a cascade of the required acoustic enhancement along with an FIR filter. We derive expressions for an optimum shaping filter and for an optimized feed-forward path. Improvement in loudspeaker output signal quality, normalized misalignment and maximum stable gain for each of the above-mentioned scenarios is assessed through numerical simulations.

AB - Modern-day hearing aids are capable of receiving acoustic signals over a wireless link and also from the surroundings through the microphone. If the hearing aid receives input only from the acoustic environment, feedback cancellation proceeds according to the existing methodologies for bias reduction. However, the wirelessly received signal and the acoustic environment input, when emitted from the same source, can be very similar to each other or with a time-delayed version of each other, thereby having a high correlation between them. Both inputs can also be emitted from different sources and, thus, be less correlated with each other. In the aforementioned scenarios, acoustic confusion can occur for the user as the hearing aid receives both signals simultaneously. To improve the output signal quality and to reduce bias in an adaptive feedback cancellation system with a wirelessly received signal as well as an acoustic environment input, we propose a cost function, and the optimization of the feed-forward path and of the shaping filter for the wireless signal. The feed-forward path is designed to be a cascade of the required acoustic enhancement along with an FIR filter. We derive expressions for an optimum shaping filter and for an optimized feed-forward path. Improvement in loudspeaker output signal quality, normalized misalignment and maximum stable gain for each of the above-mentioned scenarios is assessed through numerical simulations.

KW - Adaptive filters

KW - Convergence rate

KW - Feedback cancellation

KW - Hearing aid

KW - Misalignment

UR - http://www.scopus.com/inward/record.url?scp=85064263159&partnerID=8YFLogxK

U2 - 10.1007/s00034-019-01104-2

DO - 10.1007/s00034-019-01104-2

M3 - Journal article

VL - 38

SP - 3591

EP - 3615

JO - Circuits, Systems and Signal Processing

JF - Circuits, Systems and Signal Processing

SN - 0278-081X

IS - 8

ER -