Title :
A real time implementation and an evaluation of an optimal filtering technique for noise reduction in dual microphone hearing aids
Author :
Maj, Jean Baptiste ; Royackers, Liesbeth ; Wouters, Jan
Author_Institution :
Lab.Exp.ORL, Katholieke Univ., Leuven, Belgium
Abstract :
A real time implementation and an evaluation of a singular value decomposition (SVD) based optimal filtering technique (Doclo, S. and Moonen, M., IEEE Trans. Sig. Process., vol.50, no.9, p.2230-44, 2002) for noise reduction in a dual microphone BTE (behind-the-ear) hearing aid is presented. A method to improve the performance of a voice activity detector (VAD) is described and evaluated physically. This method is used in the real time implementation of the optimal filtering technique. A perceptual evaluation by normal hearing subjects is carried out for single and multiple jammer sound sources with speech weighted noise. The SVD-based technique can perform as well as an adaptive beamformer strategy (Maj, J.B. et al., Ear and Hearing, 2003) in a single noise scenario (i.e. the ideal scenario for the latter technique), and, can outperform the beamformer technique in a multiple noise sources scenario.
Keywords :
acoustic noise; array signal processing; filtering theory; hearing aids; random noise; signal denoising; signal detection; singular value decomposition; speech intelligibility; speech processing; SVD; VAD; behind-the-ear hearing aid; dual microphone hearing aids; jammer sound sources; noise reduction; optimal filtering technique; real time implementation; singular value decomposition; speech intelligibility; speech weighted noise; voice activity detector; Acoustic noise; Auditory system; Detectors; Filtering; Hearing aids; Jamming; Microphones; Noise reduction; Singular value decomposition; Speech enhancement;
Conference_Titel :
Acoustics, Speech, and Signal Processing, 2004. Proceedings. (ICASSP '04). IEEE International Conference on
Print_ISBN :
0-7803-8484-9
DOI :
10.1109/ICASSP.2004.1326750