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Acoustic feedback phenomenon can disturb a digital hearing aid performance at high gains, causing instability in the haring aid and degradation in the speech. In order to restore a stable situation, it is needed an acoustic feedback reduction (AFR) subsystem using adaptive algorithms such as the least-mean square (LMS) algorithm. This algorithm has a reduced computational cost, but it is very unstable. In order to avoid this situation, it is used another feedback reduction system based on a modified version of the LMS algorithm. Such algorithm is: the Normalized LMS (NLMS). These two algorithms are tested in two digital hearing aid categories: the In-The-Ear and the In-The-Canal. These categories are selected because they have great feedback effects, so robust AFR subsystems are needed. The added stable gain (ASG) over the limit gain when AFR subsystem is working in the digital hearing aid is obtained for each category. The ASG is determined as a trade-off between two measurements: the Segmented Signal-to-Noise Ratio (objective measurement) and the speech quality (subjective measurement). The results show how the digital hearing aids working with a feedback reduction adaptive filter adapted with the NLMS algorithm is able to achieve up to 18 dB of increase over the limit gain.
Author (s): Cuadra-Rodríguez, Lucas; Martínez-Leira, Almudena; Rosa-Zurera, Manuel; Vicen-Bueno, Raúl
Affiliation:
University of Alcalá
(See document for exact affiliation information.)
AES Convention: 124
Paper Number:7499
Publication Date:
2008-05-06
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Session subject:
Software, Instrumentation, and Measurement
Permalink: https://aes2.org/publications/elibrary-page/?id=14629
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Cuadra-Rodríguez, Lucas; Martínez-Leira, Almudena; Rosa-Zurera, Manuel; Vicen-Bueno, Raúl; 2008; Acoustic Feedback Reduction Based on LMS and Normalized LMS Algorithms in WOLA Filters Bank Based Digital Hearing Aids [PDF]; University of Alcalá; Paper 7499; Available from: https://aes2.org/publications/elibrary-page/?id=14629
Cuadra-Rodríguez, Lucas; Martínez-Leira, Almudena; Rosa-Zurera, Manuel; Vicen-Bueno, Raúl; Acoustic Feedback Reduction Based on LMS and Normalized LMS Algorithms in WOLA Filters Bank Based Digital Hearing Aids [PDF]; University of Alcalá; Paper 7499; 2008 Available: https://aes2.org/publications/elibrary-page/?id=14629
@article{cuadra-rodríguez2008acoustic,
author={cuadra-rodríguez lucas and martínez-leira almudena and rosa-zurera manuel and vicen-bueno raúl},
journal={journal of the audio engineering society},
title={acoustic feedback reduction based on lms and normalized lms algorithms in wola filters bank based digital hearing aids},
year={2008},
number={7499},
month={may},}
TY – paper
TI – Acoustic Feedback Reduction Based on LMS and Normalized LMS Algorithms in WOLA Filters Bank Based Digital Hearing Aids
AU – Cuadra-Rodríguez, Lucas
AU – Martínez-Leira, Almudena
AU – Rosa-Zurera, Manuel
AU – Vicen-Bueno, Raúl
PY – 2008
JO – Journal of the Audio Engineering Society
VL – 7499
Y1 – May 2008