Publications – Details
Estimation of the Reverberation Time in Noisy Environments
- Authors:
- Heinrich W. Löllmann and Peter Vary
- Book Title:
- Proceedings of International Workshop on Acoustic Echo and Noise Control (IWAENC)
- Venue:
- Seattle, Washington, USA
- Publisher:
- University of Washington
- Date:
- Sept. 2008
- Language:
- English
Abstract
This contribution presents a novel approach to determine the reverberation time (RT) from noisy observations by using a maximum likelihood (ML) estimator. It is based on a statistical model for the sound decay in reverberant enclosures which takes additive noise into account. Two estimation methods are presented. The first one considers dedicated excitation signals such as switched-off noise sources or impulsive tone-bursts. The derived ML estimator allows to determine the RT from the received signal even in the presence of background or measurement noise and achieves a significantly higher estimation accuracy than comparable approaches.
The second approach allows to estimate the RT from reverberant and noisy speech signals without a priori knowledge. This blind estimation achieves an estimation accuracy which enable its use for speech enhancement algorithms which suppress the effects of background noise and late reverberation.
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