Communications – electrical: acoustic wave systems and devices – Distance or direction finding – By combining or comparing signals
Reexamination Certificate
2007-04-06
2009-12-01
Tarcza, Thomas H (Department: 3662)
Communications, electrical: acoustic wave systems and devices
Distance or direction finding
By combining or comparing signals
Reexamination Certificate
active
07626889
ABSTRACT:
A “Sensor Array Post-Filter” provides an adaptive post-filter that accurately models and suppresses both diffuse and directional noise sources as well as interfering speech sources. The post-filter is applied to an output signal produced by a beamformer used to process signals produced by a sensor array. As a result, the Sensor Array Post-Filter operates to improve the signal-to-noise ratio (SNR) of beamformer output signals by providing adaptive post-filtering of the output signals. The post-filter is generated based on a generative statistical model for modeling signal and noise sources at distinct regions in a signal field that considers prior distributions trained to model an instantaneous direction of arrival for signals captured by sensors in the array.
REFERENCES:
patent: 5574824 (1996-11-01), Slyh et al.
patent: 6526147 (2003-02-01), Rung
patent: 6594367 (2003-07-01), Marash et al.
patent: 7035416 (2006-04-01), Matsuo
patent: 7103541 (2006-09-01), Attias et al.
patent: 7133530 (2006-11-01), Poletti
patent: 7165026 (2007-01-01), Acero et al.
patent: 2004/0175006 (2004-09-01), Kim et al.
patent: 2005/0047611 (2005-03-01), Mao
patent: 2005/0281415 (2005-12-01), Lambert et al.
patent: 2006/0198536 (2006-09-01), Kushida
patent: 2006/0233389 (2006-10-01), Mao et al.
patent: 2008/0225041 (2008-09-01), El Dokor et al.
patent: 1538867 (2006-06-01), None
Asoh, H., F. Asano, T. Yoshimura, K. Yamamoto, Y. Motomura, N. Ichimura, I. Hara, J. Ogata, An application of a particle filter to bayesian multiple sound source tracking with audio and video information fusion, Proc. of Intl. Conf. on Info. Fusion, 2004, pp. 805-812.
Dempster, A. P., N. M. Laird, D. B. Rubin, Maximum likelihood from incomplete data via the EM algorithm, J. of Royal Statistical Soc., vol. 39, No. 1, pp. 1-38,1977.
Ephraim, Y., and D. Malah, Speech enhancement using a minimum mean-square error short-time spectral amplitude estimator, IEEE Trans. Acoust., Speech, Sig. Proc., Dec. 1984, vol. 32, No. 6, pp. 1109-1121.
Huo, Q., and C.-H. Lee, On-line adaptive learning of the continuous density hidden Markov model based on approximate recursive Bayes estimate, IEEE Trans. Speech Audio Proc., Mar. 1997, vol. 5, No. 2, pp. 161-172.
Malvar, H. S., A modulated complex lapped transform and its applications to audio processing, Proc. ICASSP-99, Phoeniz, AZ, Mar. 1999, pp. 1421-1424.
McAulay, R., and M. Malpass, Speech enhancement using a soft-decision noise suppression filter, IEEE Trans. Acoust., Speech, Sig. Proc., Apr. 1980, vol. 28, No. 2, pp. 137-145.
McCowan, I. A., and H. Boulard, Microphone array post-filter based on noise field coherence, IEEE Trans. Speech Audio Proc., Nov. 2003, vol. 11, No. 6, pp. 709-716.
Seltzer, M.L., Raj, B., Stern, R.M., Likelihood-maximizing beamforming for robust hands-free speech recognition, IEEE Trans. on Speech and Audio Processing, Sep. 2004, vol. 12, No. 5, pp. 489-498.
Sohn, J., Kim, N. S., and W. Sung, A statistical model-based voice activity detection, IEEE Sig. Proc. Lett., Jan. 2000, vol. 6, No. 1.
Tashev, I., M. Seltzer, A. Acero, Microphone array for headset with spatial noise suppressor, Proc. of Ninth Int'l Workshop on Acoustic, Echo and Noise Control, IWAENC 2005, Sep. 2005, Eindhoven, The Netherlands.
Valin, J.-M., Michaud, F., and Rouat, J., Robust 3D localization and tracking of sound sources using beamforming and particle filtering, 31st Int'l Conf. on Acoustics, Speech, and Signal Processing (ICASSP 2006), pp. 841-844, Toulouse, France.
Zelinski, R., A microphone array with adaptive post-filtering for noise reduction in reverberant rooms, Proc. ICASSP-88, 1988, vol. 5, pp. 2578-2581.
Seltzer Michael L.
Tashev Ivan
Lyon & Harr LLP
Microsoft Corporation
Ratcliffe Luke D
Tarcza Thomas H
Watson Mark A.
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