WOLA noise cancelling performance

Author

Schuster, Guido ; Ansorge, Reto

Author_Institution

Electr. Eng. Dept., Univ. of Appl. Sci. of Eastern Switzerland in Rapperswil, Rapperswil, Switzerland

fYear

2008

fDate

25-29 Aug. 2008

Firstpage

1

Lastpage

5

Abstract

The goal of noise cancelling for hearing aids is to remove the noise in the corrupted speech so that the hearing impaired can better understand and participate in a conversation. Most digital hearing aids use a Weighted Overlap-Add (WOLA) structure [1] to implement the noise cancelling algorithm. Often, it is attempted to build a short time Wiener filter with a WOLA either in the FFT or in the Bark domain. Such a filter results in real valued gains to the FFT bins of the input signal and can be easily implemented in the WOLA structure. These real valued gains are also symmetrical with respect to the Nyquist rate, which results in a real valued impulse response from the filter.

Keywords

Wiener filters; filtering theory; handicapped aids; hearing aids; iterative methods; mean square error methods; quadratic programming; Bark domain; FFT bins; MSE; Nyquist rate; WOLA noise cancelling performance; digital hearing aids; iterative scheme; noise signal; optimal minimum mean square error filtering; quadratic programming; real valued filter impulse response; short time Wiener filter; signal processing structure; speech signal; weighted optimal solution; weighted overlap-add structure; window function; Noise cancellation; Optimization; Speech; Time-domain analysis; Vectors;

fLanguage

English

Publisher

ieee

Conference_Titel

Signal Processing Conference, 2008 16th European

Conference_Location

Lausanne

ISSN

2219-5491

Type

conf

Filename

7080372