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Improvement of the accuracy of attenuation constant estimation using the cross spectral technique

This paper proposes a method to improve the accuracy of the attenuation constant estimate obtained using the cross-spectral technique. In the cross-spectral technique, the envelope of the estimated impulse response is deformed due to the use of a time window. As a result, the estimated impulse response decays more rapidly than the real impulse response does and the attenuation constant obtained by the estimated impulse response becomes larger than the real value. This paper explains first how the attenuation constant changes in the process of impulse response estimation, next, the proposed method for improving the estimation accuracy.