Noise suppressor

Details Noise suppressor Noise suppressor

2011-03-22

2011-03-22

Briney, III, Walter F (Department: 2614)

Data processing: generic control systems or specific application

Specific application, apparatus or process

Digital audio data processing system

C704S226000

Reexamination Certificate

active

07912567

ABSTRACT:
A method of determining noise in an audio stream, the method comprising: acquiring a plurality of consecutive time frames of the audio stream each comprising samples of the audio stream; generating a discrete frequency spectrum for each frame responsive to the frame samples; partitioning the frequency spectrum of each frame into a plurality of same frequency bands; determining an audio energy for each frequency band in each frame; and determining an estimate of noise energy for each frequency band in a temporally last time frame responsive to a relatively small number of smallest values for the audio energy in the frequency band of the plurality of time frames.

REFERENCES:
patent: 4811404 (1989-03-01), Vilmur et al.
patent: 5943429 (1999-08-01), Handel
patent: 6415253 (2002-07-01), Johnson
patent: 6445801 (2002-09-01), Pastor et al.
patent: 6643619 (2003-11-01), Linhard et al.
patent: 6766292 (2004-07-01), Chandran et al.
patent: 7058572 (2006-06-01), Nemer
patent: 7072831 (2006-07-01), Etter
patent: 2005/0071156 (2005-03-01), Xu et al.
patent: 2007/0260454 (2007-11-01), Gemello et al.
patent: 2008/0189104 (2008-08-01), Zong et al.
“The Enhanced Variable Rate Coder; Toll Quality Speech for CDMA”, M. Recchione, International Journal Speech Tech. 2 (1999) 305-315.
“A Noise-Estimation Algorithm for highly non-stationary environments”, S. Rangachari, P. C. Loizou, Speech Communication 48 (2006) 220-231.
“Enhancement of Speech Corrupted by Acoustic Noise,” Berouti et al., Proc. IEEE ICASSP, pp. 208-211 (Apr. 1979).
“Noise Estimation Techniques for Robust Speech Recognition”, Hirsch and Ehrlicher (Proc. IEEE Int. Conf. on Acoustics Speech Signal Processing, 1995, pp. 153-156).
“Assessing local noise level estimation methods: Application to noise robust ASR” Ris and Dupont (Speech Communication 34 (2001) pp. 141-158).

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