A Two-Sensor Noise Reduction System: Applications for Hands-Free Car Kit

This paper presents a two-microphone speech enhancer designed to remove noise in hands-free car kits. The algorithm, based on the magnitude squared coherence, uses speech correlation and noise decorrelation to separate speech from noise. The remaining correlated noise is reduced using cross-spectral subtraction. Particular attention is focused on the estimation of the different spectral densities (noise and noisy signals power spectral densities) which are critical for the quality of the algorithm. We also propose a continuous noise estimation, avoiding the need of vocal activity detector. Results on recorded signals are provided, showing the superiority of the two-sensor approach to single microphone techniques.

[1]  Jörg Meyer,et al.  Multi-channel speech enhancement in a car environment using Wiener filtering and spectral subtraction , 1997, 1997 IEEE International Conference on Acoustics, Speech, and Signal Processing.

[2]  J Vanden Berghe,et al.  An adaptive noise canceller for hearing aids using two nearby microphones. , 1998, The Journal of the Acoustical Society of America.

[3]  Régine Le Bouquin-Jeannès,et al.  Speech enhancement using a wiener filtering under signal presence uncertainty , 1996, 1996 8th European Signal Processing Conference (EUSIPCO 1996).

[4]  T. Ens,et al.  Blind signal separation : statistical principles , 1998 .

[5]  V. Nieto,et al.  A SPEECH ENHANCEMENT SYSTEM BASED ON NEGATIVE BEAMFORMING AND SPECTRAL SUBTRACTION , 2001 .

[6]  Dirk Van Compernolle,et al.  Switching adaptive filters for enhancing noisy and reverberant speech from microphone array recordings , 1990, ICASSP.

[7]  S. Boll,et al.  Suppression of acoustic noise in speech using spectral subtraction , 1979 .

[8]  R. McAulay,et al.  Speech enhancement using a soft-decision noise suppression filter , 1980 .

[9]  Ephraim.  Speech enhancement using a minimum mean square error short-time spectral amplitude estimator , 1984 .

[10]  Christophe Beaugeant,et al.  New optimal filtering approaches for hands-free telecommunication terminals , 1998, Signal Process..

[11]  Marc Moonen,et al.  A multichannel subband GSVD based approach for speech enhancement in hearing aids , 2001 .

[12]  Alexandre Guérin.  Rehaussement de la parole pour les communications mains-libres. Réduction de bruit et annulation d'écho non linéaire , 2003 .

[13]  Marc Moonen,et al.  A two-stage adaptive beamformer for noise reduction in hearing aids , 2001 .

[15]  Régine Le Bouquin-Jeannès,et al.  Enhancement of speech degraded by coherent and incoherent noise using a cross-spectral estimator , 1997, IEEE Trans. Speech Audio Process..

[16]  Marc Moonen,et al.  SVD-Based Optimal Filtering Technique for Noise Reduction in Hearing Aids Using Two Microphones , 2002, EURASIP J. Adv. Signal Process..

[17]  Corinne Baillargeat.  Contribution a l'amelioration des performances d'un radiotelephone mains-libres a commande vocale , 1991 .

[18]  Stefan Ernst,et al.  Combination of two-channel spectral subtraction and adaptive wiener post-filtering for noise reduction and dereverberation , 1996, 1996 8th European Signal Processing Conference (EUSIPCO 1996).

[19]  Sven Fischer,et al.  Suppression of coherent and incoherent noise using a microphone array , 1994 .

[20]  Regine Le Bouquin.  Traitements pour la reduction du bruit sur la parole. Application aux communications radio-mobiles , 1991 .

[21]  Olivier Cappé,et al.  Elimination of the musical noise phenomenon with the Ephraim and Malah noise suppressor , 1994, IEEE Trans. Speech Audio Process..

[22]  Neviano Dal Degan,et al.  Acoustic noise analysis and speech enhancement techniques for mobile radio applications , 1988 .

[23]  K. U. Simmer,et al.  MULTI-MICROPHONE NOISE REDUCTION BY POST-FILTER AND SUPERDIRECTIVE BEAMFORMER , 1999 .

[24]  Hervé Bourlard,et al.  Microphone array post-filter for diffuse noise field , 2002, 2002 IEEE International Conference on Acoustics, Speech, and Signal Processing.

[25]  Richard M. Schwartz,et al.  Enhancement of speech corrupted by acoustic noise , 1979, ICASSP.