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De-reverberation using frequency-domain center clipper

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2 Author(s)
S. M. Kuo ; Dept. of Electr. Eng., Northern Illinois Univ., DeKalb, IL, USA ; D. W. Sun

This paper presents the development and analysis of audio de-reverberation algorithms. The modified frequency-sampling filter (FSF) provides an effective filter bank for splitting a signal into equally spaced frequency channels. The center clipper with optimized voice-activity detector and inverse room transfer function (RTF) is employed at each frequency bin. The nonlinear center-clipping operation is analyzed in theory using a sinusoidal signal and Fourier transform. The results show that the clipper generates odd harmonics and may be reduced by a simple low-pass filter. Computer simulations using real speech and measured RTF show that reverberation effects are suppressed successfully with no obvious distortions

Published in:

Wireless Communications, 2001. (SPAWC '01). 2001 IEEE Third Workshop on Signal Processing Advances in

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