Spatial noise suppression for a microphone array
A noise reduction system and a method of noise reduction includes a microphone array comprising a first microphone, a second microphone, and a third microphone. Each microphone has a known position and a known directivity pattern. An instantaneous direction-of-arrival (IDOA) module determines a firs...
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Format | Patent |
Language | English |
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31.01.2012
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Abstract | A noise reduction system and a method of noise reduction includes a microphone array comprising a first microphone, a second microphone, and a third microphone. Each microphone has a known position and a known directivity pattern. An instantaneous direction-of-arrival (IDOA) module determines a first phase difference quantity and a second phase difference quantity. The first phase difference quantity is based on phase differences between non-repetitive pairs of input signals received by the first microphone and the second microphone, while the second phase difference quantity is based on phase differences between non-repetitive pairs of input signals received by the first microphone and the third microphone. A spatial noise reduction module computes an estimate of a desired signal based on a priori spatial signal-to-noise ratio and an a posteriori spatial signal-to-noise ratio based on the first and second phase difference quantities. |
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AbstractList | A noise reduction system and a method of noise reduction includes a microphone array comprising a first microphone, a second microphone, and a third microphone. Each microphone has a known position and a known directivity pattern. An instantaneous direction-of-arrival (IDOA) module determines a first phase difference quantity and a second phase difference quantity. The first phase difference quantity is based on phase differences between non-repetitive pairs of input signals received by the first microphone and the second microphone, while the second phase difference quantity is based on phase differences between non-repetitive pairs of input signals received by the first microphone and the third microphone. A spatial noise reduction module computes an estimate of a desired signal based on a priori spatial signal-to-noise ratio and an a posteriori spatial signal-to-noise ratio based on the first and second phase difference quantities. |
Author | Acero, Alejandro Tashev, Ivan J Seltzer, Michael L |
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References | S. Laugesen, K. Rasmussen, T. Christiansen, "Design of a Microphone Array for Headsets," IEEE Workshop on Applications of Signal Processing to Audio and Acoustics, Oct. 2003, New Paltz, NY. P. J. Wolfe and S. J. Godsill, "Simple alternatives to the Ephraim and Malah suppression rule for speech enhancement," In Proceedings of the IEEE Workshop on Statistical Signal Processing, pp. 496-499, 2001. Mitsuhashi et al. (2008/0019535) 20080100 Pascal Scalart, Speech Enhacement Based on Priori Signal to Noise Estimation, 1996,IEEE, p. 629-632. Ichikawa et al. (2003/0177006) 20030900 Linhard et al. (6643619) 20031100 Tashev et al. (2005/0195988) 20050900 I. Tashev, H. Malvar, "A New Beamformer Design Algorithm for Microphone Arrays," ICASSP 2005, Philadelphia, Mar. 2005. I. Tashev, "Gain calibration procedure for microphone arrays," ICME 2004, Taipei, Jun. 2004. Elko (6041127) 20000300 Grover (7139711) 20061100 Heberley et al. (6914854) 20050700 Rui (2004/0037436) 20040200 Kim et al. (6778954) 20040800 H. S. Malvar, "A modulated complex lapped transform and its applications to audio processing," ICASSP 99, Phoenix, pp. 1421-1424, Mar. 1999. Christoph (2007/0127736) 20070600 Kim et al. (2004/0175006) 20040900 Vahatalo et al. (5839101) 19981100 Tashev et al. (7415117) 20080800 Kaneda (5208864) 19930500 Tashev et al. (2008/0288219) 20081100 Adlersberg et al. (5012519) 19910400 Jeong et al. (2009/0141908) 20090600 DeVries (6289309) 20010900 Moogi et al. (7366658) 20080400 Jens Meyer, Noise Cancelling for Microphone Arrays, 1997, IEEE, pp. 211-213. X. Zhang, Y. Jia, "A Soft Decision Based Noise Cross Power Spectral Density Estimation for Two-Microphone Speech Enhancement Systems," ICASSP 2005, Philadelphia, Mar. 2005. Accardi et al. (2002/0002455) 20020100 Kato et al. (2004/0049383) 20040300 Choi (2004/0230428) 20041100 Acero et al. (7565288) 20090700 Y. Ephraim, D. Malah. "Speech Enhancement Using a Minimum Mean-Square Error Short-Time Spectral Amplitude Estimator," IEEE Trans. On Acoustics, Speech, and Signal Processing, vol. ASSP-32, No. 6, Dec. 1984. C. Lai, P. Aarabi, "Multiple-Microphone Time-Varying Filters for Robust Speech Recognition," ICASSP 2004, Montreal, May 2004. Son et al. (7080007) 20060700 Kim et al. (2005/0276361) 20051200 |
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