Measuring the sound absorption properties of noise barriers with inverse filtered maximum length sequences

Reinhard Wehr, Manfred Haider, Marco Conter, Sara Gasparoni, Simon Breuss

Publikation: Beitrag in FachzeitschriftArtikelBegutachtung

Abstract

Loudspeaker characteristics can have an appreciable influence on the sound absorption properties obtained with CEN/TS 1793-5 [1]. Although sound sources with omnidirectional radiation properties are favored, these often hold the problem of long impulse responses due to their design potentially incorporating ports [2]. In this paper, the inverse filtering approach is applied to two different sound sources. It is shown that it is a valuable measure to reduce the influence of the loudspeaker characteristics on the obtained sound absorption values. Furthermore, an attempt is made to measure the absorption properties according to CEN/TS 1793-5 without the need for the subtraction procedure of a free-field measurement. Thereby, as long as only high frequencies are considered, reasonable values can be obtained.
OriginalspracheEnglisch
Seiten (von - bis)631-639
Seitenumfang9
FachzeitschriftApplied Acoustics
PublikationsstatusVeröffentlicht - 2012

Research Field

  • Ehemaliges Research Field - Mobility Systems

Schlagwörter

  • Sound absorption
  • Traffic Noise
  • Noise Barriers
  • Short impulse response
  • MLS
  • Inverse filtering

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