Test Signal Selection for Determining the Sound Scattering Coefficient in a Reverberation Chamber

Kamisiński, Tadeusz; Brawata, Krzysztof; Pilch, Adam; Rubacha, Jarosław; Zastawnik, Marcin

doi:10.2478/v10168-012-0051-2

Cited by 8 publications

(3 citation statements)

References 6 publications

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“…Finally, it should be added that not only sound noise measurements assume a normal probability distribution of results. This assumption, often incorrect, is commonly used in other acoustic measurements, e.g., of acous-tic structures' parameters (Kamisiński et al, 2012;Szeląg et al, 2013). Therefore, it is important to choose carefully the method for determining the acoustic measurements uncertainty due to the specific probability distribution of the results.…”

Section: Discussionmentioning

confidence: 99%

Analysis of the Accuracy of Uncertainty Noise Measurement

Przysucha¹,

Batko²,

Szeląg³

2015

Archives of Acoustics

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The paper formulates some objections to the methods of evaluation of uncertainty in noise measurement which are presented in two standards : ISO 9612 (2009) and DIN 45641 (1990). In particular, it focuses on approximation of an equivalent sound level by a function which depends on the arithmetic average of sound levels. Depending on the nature of a random sample the exact value of the equivalent sound level may be significantly different from an approximate one, which might lead to erroneous estimation of the uncertainty of noise indicators. The article presents an analysis of this problem and the adequacy of the solution depending on the type of a random sample.

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Section: Discussionmentioning

confidence: 99%

Analysis of the Accuracy of Uncertainty Noise Measurement

Przysucha¹,

Batko²,

Szeląg³

2015

Archives of Acoustics

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“…Graphs shown in Fig. 11 a come from the authors' own measurements (Kamisiński et al, 2012b), while scattering coefficients of other materials have been adopted as suggested in the instructions for the program CATTAcoustic.…”

Section: Computer Simulationsmentioning

confidence: 99%

Can Historic Interiors with Large Cubature be Turned Acoustically Correct?

Kamisiński

Kulowski

Kinasz

2016

Archives of Acoustics

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Historic interiors with large cubature, such as reception, theatrical, and concert halls, need to be renovated periodically if they are to be preserved as cultural heritage for future generations. In such cases it is necessary to maintain appropriate balance between requirements imposed by heritage conservation authorities office which are usually being given a higher priority, applicable safety regulations, and the comfort of use, including good acoustics.The paper is a presentation of architectural interference in three historic interiors with large cubature leading to changes in their acoustic qualities. In two cases, the changes were beneficial to the functional qualities of the halls to satisfaction of the investors carrying out the renovation work. In the third instance, the architectural interference aimed at showing off the monumental valor of the interior resulted in significant degradation of its acoustics. To remedy the situation impairing the functional program of the facility, corrective measures are proposed neutral with respect to its historic character.

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“…The quantity is determined in conditions close to those prevailing in actual rooms and for that reason the coecient is commonly used in dedicated room-acoustics calculation algorithms. The random-incidence scattering coefcient was dened in ISO 17497-1 standard in the year 2004 [15], however, studies on the appropriate measurement procedure are still continued [16].…”

Section: Introductionmentioning

confidence: 99%

Comparison of Pressure and Intensity Methods in Evaluating the Directional Diffusion Coefficient

2013

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The directional diusion coecient characterizes directional uniformity of acoustic energy reected from a structure. The goal of the paper is to check whether dierent measurement methods of that coecient give comparable results and can be used for dierent diusing structures. ISO 17497-2:2012 recommends two basic measurement methods for this parameter, both based on sound pressure analysis. In the rst method, one microphone and a measurement manipulator is used (the space method), while in the second one, 19 microphones placed on the sound-reecting plane are required (the boundary method). In the standard it is assumed (as usually in the room acoustics), that the acoustic energy is proportional to the square of sound pressure, what is true only for the plane wave. Correctness of this assumption was checked by the modied space method where the sound intensity probe was installed instead of microphone. The test revealed that pressure methods gave comparable results for both low-and high-diusion structures, with the boundary method giving moderately higher values for low-diusion structures and slightly higher for high-diusion structures. The results obtained in the intensity method were comparable with the pressure method except for the 2000 Hz frequency range.

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Test Signal Selection for Determining the Sound Scattering Coefficient in a Reverberation Chamber

Cited by 8 publications

References 6 publications

Analysis of the Accuracy of Uncertainty Noise Measurement

Analysis of the Accuracy of Uncertainty Noise Measurement

Can Historic Interiors with Large Cubature be Turned Acoustically Correct?

Comparison of Pressure and Intensity Methods in Evaluating the Directional Diffusion Coefficient

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