Publications – Details
A Novel Approach for Impulse Response Measurements in Environments with Time-Varying Noise
- Authors:
- Aulis Telle and Peter Vary
- Book Title:
- International Congress on Acoustics (ICA)
- Venue:
- Sydney, Australia
- Event Date:
- 23.-27.8.2010
- Organization:
- Australian Acoustical Society
- Location:
- Sydney
- Date:
- Aug. 2010
- ISBN:
- 978-0-64654-052-8
- Language:
- English
Abstract
A typical measure taken against unavoidable noise during the measurement of an impulse response of an acoustical system is to repeat the measurement a couple of times and coherently average the distinct measurements. With stationary noise this is the optimal solution which gives an improvement of the signal-to-noise ratio of about 3 dB per doubling of the number of measurements averaged. If transient or time varying noise components are present the resulting accuracy suffers significantly. In this contribution, the authors propose a weighted averaging approach where the distinct measurements are weighted according to the present noise power. The noise power is estimated with the so-called SWiC method (sliding window correlation) recently published by the authors.
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