NDLI: QRD-based optimal filtering for multichannel speech enhancement using time varying smoothing factor

Content Provider	IEEE Xplore Digital Library
Author	Gibak Kim Nam Ik Cho
Copyright Year	2005
Description	Author affiliation: Sch. of Electr. Eng., Seoul Nat. Univ., South Korea (Gibak Kim; Nam Ik Cho)
Abstract	In this paper, we introduce a time varying smoothing factor for the noise update in the optimal filtering based on QR decomposition (QRD). Conventionally, the noise statistics are updated during noise-only periods and kept fixed during speech present periods in QRD-based multichannel noise reduction [G. Rombouts and M. Moonen, Sept 2003]. Instead of using this conventional scheme that needs an explicit voice activity detector (VAD), we adopt a time varying smoothing factor which is parameterized from the normalized cross correlation (NCC). In a multi-microphone based system, the NCCs between two microphones can be used for finding the direction of signals [M. Omologo and P. Svaizer, 1994]. Provided that we know the direction of the speech signal and the time delays between microphones are compensated, the NCCs can be considered as a measure for the speech presence probability. The NCCs are estimated for a given time interval, and they are averaged over the microphones and smoothed in time. Then the averaged value is mapped to a smoothing factor through a nonlinear function. The simulation results show that the proposed algorithm yields better performance compared to the conventional QRD-based noise reduction.
Starting Page	37
Ending Page	40
File Size	3500595
Page Count	4
File Format	PDF
ISBN	0780392663
DOI	10.1109/ISPACS.2005.1595340
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2005-12-13
Publisher Place	China
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Filtering Speech enhancement Smoothing methods Microphones Noise reduction Wiener filter Statistics Time measurement Array signal processing Delay effects
Content Type	Text
Resource Type	Article

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