Title :
Multi-Band Speech Enhancement for Functional MRI
Author :
Ramachandran, V. ; Panahi, I.M.S. ; Hu, Y. ; Loizou, P.C. ; Briggs, R.W. ; McCaslin, S.R.
Author_Institution :
Dept. of Electr. Eng., Texas Univ., Dallas, TX
Abstract :
We present an adaptive enhancement method for speech signal corrupted by the 3 Tesla (3T) functional magnetic resonance imaging (fMRI) acoustic noise. The noisy speech signal is filtered into several frequency bands and noise cancellation is applied to each band independently. We use normalized least mean squares (NLMS) algorithm for updating the co-efficients of the adaptive filters in both wideband and in multi-band implementations. The NLMS algorithm is used to ensure faster convergence and stability. The multi-band method shows a better performance than the conventional wideband method resulting in a better noise reduction. It is shown that the distortion introduced by the band-pass filters limits the overall speech enhancement when the number of bands increases beyond an optimal value
Keywords :
acoustic noise; adaptive filters; band-pass filters; biomedical MRI; least mean squares methods; speech enhancement; acoustic noise; adaptive enhancement method; adaptive filters; band-pass filters; functional MRI; functional magnetic resonance imaging; multiband speech enhancement; noise cancellation; noise reduction; normalized least mean squares; speech signal; Acoustic noise; Adaptive filters; Convergence; Frequency; Magnetic noise; Magnetic resonance imaging; Magnetic separation; Noise cancellation; Speech enhancement; Wideband;
Conference_Titel :
Acoustics, Speech and Signal Processing, 2006. ICASSP 2006 Proceedings. 2006 IEEE International Conference on
Conference_Location :
Toulouse
Print_ISBN :
1-4244-0469-X
DOI :
10.1109/ICASSP.2006.1660876