Your browser doesn't support javascript.
loading
Stability-controlled hybrid adaptive feedback cancellation scheme for hearing aids.
Nordholm, Sven; Schepker, Henning; Tran, Linh T T; Doclo, Simon.
Afiliación
  • Nordholm S; Department of Electrical and Computer Engineering, Curtin University, Perth, WA, 6102, Australia.
  • Schepker H; Signal Processing Group, Department of Medical Physics and Acoustics and Cluster of Excellence "Hearing4All," University of Oldenburg, Oldenburg, Germany.
  • Tran LTT; Department of Electrical and Computer Engineering, Curtin University, Perth, WA, 6102, Australia.
  • Doclo S; Signal Processing Group, Department of Medical Physics and Acoustics and Cluster of Excellence "Hearing4All," University of Oldenburg, Oldenburg, Germany.
J Acoust Soc Am ; 143(1): 150, 2018 01.
Article en En | MEDLINE | ID: mdl-29390746
Adaptive feedback cancellation (AFC) techniques are common in modern hearing aid devices (HADs) since these techniques have been successful in increasing the stable gain. Accordingly, there has been a significant effort to improve AFC technology, especially for open-fitting and in-ear HADs, for which howling is more prevalent due to the large acoustic coupling between the loudspeaker and the microphone. In this paper, the authors propose a hybrid AFC (H-AFC) scheme that is able to shorten the time it takes to recover from howling. The proposed H-AFC scheme consists of a switched combination adaptive filter, which is controlled by a soft-clipping-based stability detector to select either the standard normalized least mean squares (NLMS) algorithm or the prediction-error-method (PEM) NLMS algorithm to update the adaptive filter. The standard NLMS algorithm is used to obtain fast convergence, while the PEM-NLMS algorithm is used to provide a low bias solution. This stability-controlled adaptation is hence the means to improve performance in terms of both convergence rate as well as misalignment, while only slightly increasing computational complexity. The proposed H-AFC scheme has been evaluated for both speech and music signals, resulting in a significantly improved convergence and re-convergence rate, i.e., a shorter howling period, as well as a lower average misalignment and a larger added stable gain compared to using either the NLMS or the PEM-NLMS algorithm alone. An objective evaluation using the perceptual evaluation of speech quality and the perceptual evaluation of audio quality measures shows that the proposed H-AFC scheme provides very high-quality speech and music signals. This has also been verified through a subjective listening experiment with N = 15 normal-hearing subjects using a multi-stimulus test with hidden reference and anchor, showing that the proposed H-AFC scheme results in a better perceptual quality than the state-of-the-art PEM-NLMS algorithm.
Asunto(s)

Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Corrección de Deficiencia Auditiva / Percepción Auditiva / Acústica / Algoritmos / Procesamiento de Señales Asistido por Computador / Personas con Deficiencia Auditiva / Audífonos Tipo de estudio: Prognostic_studies Límite: Adult / Humans Idioma: En Revista: J Acoust Soc Am Año: 2018 Tipo del documento: Article País de afiliación: Australia Pais de publicación: Estados Unidos

Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Corrección de Deficiencia Auditiva / Percepción Auditiva / Acústica / Algoritmos / Procesamiento de Señales Asistido por Computador / Personas con Deficiencia Auditiva / Audífonos Tipo de estudio: Prognostic_studies Límite: Adult / Humans Idioma: En Revista: J Acoust Soc Am Año: 2018 Tipo del documento: Article País de afiliación: Australia Pais de publicación: Estados Unidos