The sound absorption coefficient measurement (following ISO 13472-1 normative) of highly absorbing materials, which are tipically employed in room acoustic correction, presents some inherent difficulties. These materials present highly sound absorption coefficient indeed, but usually low sound insulation index and are installed over highly reflective surfaces. This leads to some measurement problems, partially solved by means of the reference surface method. In this work some measurement examples on the same materials but with different contour conditions are analyzed and the improvements on the results, due to reference surface normalization and time domain subtraction of free field response, are discussed.

Guidorzi P., Garai M. (2008). Signal analysis in the sound absorption measurement procedure: the importance of time subtraction and reference surface corrections. PARIS : SFA.

Signal analysis in the sound absorption measurement procedure: the importance of time subtraction and reference surface corrections

GUIDORZI, PAOLO;GARAI, MASSIMO
2008

Abstract

The sound absorption coefficient measurement (following ISO 13472-1 normative) of highly absorbing materials, which are tipically employed in room acoustic correction, presents some inherent difficulties. These materials present highly sound absorption coefficient indeed, but usually low sound insulation index and are installed over highly reflective surfaces. This leads to some measurement problems, partially solved by means of the reference surface method. In this work some measurement examples on the same materials but with different contour conditions are analyzed and the improvements on the results, due to reference surface normalization and time domain subtraction of free field response, are discussed.
2008
Proceedings of Acoustics '08 Paris
1755
1760
Guidorzi P., Garai M. (2008). Signal analysis in the sound absorption measurement procedure: the importance of time subtraction and reference surface corrections. PARIS : SFA.
Guidorzi P.; Garai M.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/61420
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