The problem of measuring the sound-absorption coefficient in situ is approached in a systematic way, accounting for parasitic reflections and background noise. The basic reflection method is improved by using pseudo-random binary sequences of maximum length as the test signal. The measurement procedure is orientated towards digital processing techniques and uses the advantages of modern instruments. The inherent cross-correlation process greatly improves the noise immunity. The relationship between the loudspeaker characteristics and the sample size is clarified. The use of a non-rectangular analysis window is suggested. The proposed method was tested in a normally furnished room using portable instruments; the normal-incidence results are in good agreement with values measured using the conventional Kundt's tube method. © 1993.

Measurement of the sound-absorption coefficient in situ: The reflection method using periodic pseudo-random sequences of maximum length / Garai M.. - In: APPLIED ACOUSTICS. - ISSN 0003-682X. - STAMPA. - 39:1-2(1993), pp. 119-139. [10.1016/0003-682X(93)90032-2]

Measurement of the sound-absorption coefficient in situ: The reflection method using periodic pseudo-random sequences of maximum length

Garai M.
Primo
1993

Abstract

The problem of measuring the sound-absorption coefficient in situ is approached in a systematic way, accounting for parasitic reflections and background noise. The basic reflection method is improved by using pseudo-random binary sequences of maximum length as the test signal. The measurement procedure is orientated towards digital processing techniques and uses the advantages of modern instruments. The inherent cross-correlation process greatly improves the noise immunity. The relationship between the loudspeaker characteristics and the sample size is clarified. The use of a non-rectangular analysis window is suggested. The proposed method was tested in a normally furnished room using portable instruments; the normal-incidence results are in good agreement with values measured using the conventional Kundt's tube method. © 1993.
1993
Measurement of the sound-absorption coefficient in situ: The reflection method using periodic pseudo-random sequences of maximum length / Garai M.. - In: APPLIED ACOUSTICS. - ISSN 0003-682X. - STAMPA. - 39:1-2(1993), pp. 119-139. [10.1016/0003-682X(93)90032-2]
Garai M.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/885517
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