Noise Power Spectral Density Estimation for Public Address Systems in Noisy Reverberant Environments

Konferenz: IWAENC 2012 - International Workshop on Acoustic Signal Enhancement
04.09.2012-06.09.2012 in Aachen, Germany

Tagungsband: IWAENC 2012

Seiten: 4Sprache: EnglischTyp: PDF

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Faraji, Neda (Amirkabir University of Technology, EED, 424,Hafez Ave., Tehran, Iran)
Hendriks, Richard. C. (Delft University of Technology, SIPlab, 2628 CD Delft, The Netherlands)

In many public areas, public address systems play a central role in broadcasting important messages. Consider e.g., airports or train stations. The intelligibility of messages broadcast by such public address systems gets reduced due to environmental noise sources. Usually, these systems therefore employ a pre-processing module to modify the original message such that its intelligibility in the noisy environment is increased. Most of the pre-processing methods for intelligibility improvement require an estimate of the environmental noise PSD. However, existing noise PSD estimators overestimate the noise PSD in reverberant environments, leading to an overamplification of the speech by the speech intelligibility pre-processing module. In this paper, we propose a new MMSE-based noise PSD estimator that can be utilized in public address systems considering reverberation. Index Terms — Noise PSD tracking, Public address system, Reverberation