A Novel Approach for Impulse Response Measurements in Environments with Time-Varying Noise

Authors:

Telle, A. ,  Vary, P.

Book Title:

International Congress on Acoustics (ICA)

Organization:

Australian Acoustical Society

Address:

Sydney, Australia

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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