Using a reflection model for modeling the dynamic feedback path of digital hearing aids

Guilin Ma, Fredrik Gran, Finn Jacobsen, Finn T. Agerkvist

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Abstract

Feedback whistling is one of the severe problems with hearing aids, especially in dynamic situations when the users hug, pick up a telephone, etc. This paper investigates the properties of the dynamic feedback paths of digital hearing aids and proposes a model based on a reflection assumption. The model is compared with two existing models: a direct model and an initialization model, using the measured dynamic feedback paths. The comparison shows that the proposed approach is able to model the dynamic feedback paths more efficiently and accurately in terms of mean-square error and maximum stable gain. The method is also extended to dual-microphone hearing aids to assess the possibility of relating the two dynamic feedback paths through the reflection model. However, it is found that in a complicated acoustic environment, the relation between the two feedback paths can be very intricate and difficult to exploit to yield better modeling of the dynamic feedback paths. (C) 2010 Acoustical Society of America. [DOI: 10.1121/1.3290989]
Original languageEnglish
JournalAcoustical Society of America. Journal
Volume127
Issue number3
Pages (from-to)1458-1468
ISSN0001-4966
DOIs
Publication statusPublished - 2010

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Copyright (2010) Acoustical Society of America. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the Acoustical Society of America.

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