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P8 - Determination of the measurement uncertainty of room acoustic quantities

Discussing the acoustic condition in auditoria is difficult due to two major shortcomings. Firstly the uncertainty of room acoustical measurement is still under investigation and secondly the present understanding of how sensitive listeners are to perceive differences in sound fields in auditoria appears incomplete. How these aspects are related to each other can easily be seen when the fluctuations of single number parameters (e.g. C80, LF, etc.) depending on the micro- phone position, as described by de Vries, are compared to just noticeable differences quoted in ISO 3382. Such findings would suggest that the perception of the sound fields in an auditorium varies already with minor changes of the listener position. Since it is common experience that such changes are not noticeable, the reason for this false reasoning needs to be analysed. A joint discussion of measurement uncertainties and perceptual aspects has the potential to clarify this aspect. In this project two topics are addressed in parallel. On the one hand the discussion of meas- urement uncertainty according to the framework of the “Guide to the expression of uncertainty in measurement” (GUM) will treat influence factors that have not been discussed in detail yet. On the other hand just noticeable difference for widely used room acoustic quantities will be determined on the basis of realistic presentations of real sound fields. Standard statistical methodologies to analyse the data from listening tests (such as constrained maximum-likelihood strategies) will be enhanced to include the statistical measurement uncertainty of the physical quantities (describing the stimuli). Based on these advances the determined difference limens have the potential to better reflect a listener’s sensitivity.

Principal Investigator

Lupe

Prof. Dr. rer. nat Michael Vorländer

Institute for Technical Acoustics
RWTH Aachen
Neustr. 50 
52066 Aachen 

phone :
0241 80 97985 
fax : 0241 80 92214 
e-mail : mvo [at] akustik.rwth-aachen.de

Researchers

Lupe

Dipl.-Ing. Martin Guski

Institute for Technical Acoustics
RWTH Aachen
Neustr. 50 
52066 Aachen 

phone :
+49 (0)241 80 97984
fax : +49 (0) 241  80 92214
email: martin.guski[at]akustik.rwth-aachen.de

Lupe

Dipl.-Ing. Ingo Witew

Institute for Technical Acoustics
RWTH Aachen
Neustr. 50 
52066 Aachen 

phone :
+49 (0)241 80 97994
fax : +49 (0) 241  80 92214
email: ingo.witew[at]akustik.rwth-aachen.de

Student Assistants

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