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R2 at 16,63 m R8 at 29,05 m R12 at 31,91 m R3 at 32,16 m R4 at 42,21 m R7 at 46,39 m R11 at 49,86 m R5 at 57,59 m R6 at 73,05 m R10 at 74,24 m R9 at 85,73 m R2 at 16,63 m R8 at 29,05 m R12 at 31,91 m R3 at 32,16 m R4 at 42,21 m R7 at 46,39 m R11 at 49,86 m R5 at 57,59 m R6 at 73,05 m R10 at 74,24 m R9 at 85,73 m C(80) (dB) C(80) (dB) R2 at 16,63 m R8 at 29,05 m R12 at 31,91 m R3 at 32,16 m R4 at 42,21 m R7 at 46,39 m R11 at 49,86 m R5 at 57,59 m R6 at 73,05 m R10 at 74,24 m R9 at 85,73 m R2 at 16,63 m R8 at 29,05 m R12 at 31,91 m R3 at 32,16 m R4 at 42,21 m R7 at 46,39 m R11 at 49,86 m R5 at 57,59 m R6 at 73,05 m R10 at 74,24 m R9 at 85,73 m Ts (ms) D(50) R2 at 16,63 m R8 at 29,05 m R12 at 31,91 m R3 at 32,16 m R4 at 42,21 m R7 at 46,39 m R11 at 49,86 m R5 at 57,59 m R6 at 73,05 m R10 at 74,24 m R9 at 85,73 m R2 at 16,63 m R8 at 29,05 m R12 at 31,91 m R3 at 32,16 m R4 at 42,21 m R7 at 46,39 m R11 at 49,86 m R5 at 57,59 m R6 at 73,05 m R10 at 74,24 m R9 at 85,73 m EDT (s) T(30) (s) EDT at 1000 Hz T(30) at 1000 Hz 12 10 8 Simulated 12 Measured 10 8 Simulated Measured 6 4 2 0 6 4 2 Receiver Odeon©1985-2013 Licensed to: Odeon Ts at 1000 Hz 1.000 800 Distance Odeon©1985-2013 Licensed to: Odeon D(50) at 1000 Hz Simulated Measured 0,6 Simulated Measured 600 0,4 400 200 0 0,2 0 Receiver Odeon©1985-2013 Licensed C(80) at 125 to: Odeon Hz 10 0 Receiver Odeon©1985-2013 C(80) Licensed at 1000 to: Odeon Hz 10 Simulated Measured 0 Simulated Measured -10 -10 -20 -20 Receiver Odeon©1985-2013 Licensed to: Odeon Receiver Odeon©1985-2013 Licensed to: Odeon Figure 17: Room acoustic parameters simulated and measured in Hagia Sophia at 1000 Hz. Simulated parameters displayed with red square and measurements with blue cross. 24
6 CONCLUSIONS It is possible to make reasonable measurement of T 30 using alternative excitation signals such as hand claps or popping of a balloon if sufficient signal to noise ratio can be obtained. The other ISO 3382-1 parameters may have limited accuracy probably because the source is not perfect omni-directional. Truncation of impulse responses and background noise in impulse responses may lead systematic errors on T 30 if not compensated for. If compensating for both errors correct results may be achieved with moderate signal to noise levels. Deviation was not larger than 0.7 JND for measurements of any of the ISO 3382-1 parameters tested at 1000 Hz when using 7 different positions within a volume of (w, l, h) = (0.6, 0.3, 0.2) metres at a central position in an auditorium – this indicates that parameters can be reproduced even if receiver position is not exact. For simulations in ODEON small deviations in position seems negligible. It is possible to simulate and measure room acoustics parameter according to ISO 3382-1 if care is taken in implementation and use of simulation and measurement algorithms. Indeed the examples used in this paper show reasonable agreement. In the auditorium example there is fine agreement between measured and simulated values and even in the large cathedral Hagia Sofia trends with receiver position agree well between simulations and measurements. 7 REFERENCES 1 H. Kuttruff, Room Acoustics, London: Applied science publishers LTD, 1973. 2 C. C. M. Hak, R. H. C. Wenmaekers and L. C. Luxemburg, "Measuring Room Impulse Responses: Impact of the Decay Range on Derived Room Acoustic Parameters," Acta Acoustica United with Acustica, vol. 98, pp. 907-915, 2012. 3 ISO 3382-1. Acoustics - Measurement of room acoustic parameters - Part 1: Performance spaces, Geneva: International Organization for Standardization, 2009. 4 M. R. Schroeder, "On frequency responsem curves in rooms: Comparison of experimental, theoretical and Monte Carlo results for the average frequency spacing between maxima," J. Acoust. Soc. Am, vol. 34, pp. 76-80, 1962. 5 C. L. Christensen, ODEON Room Acoustics Software, Version 12, User Manual, Kgs. Lyngby: Odeon A/S, 2013. 6 A. Nash, "On the reproducibility of measuring random incidence sound absorption," in Paper 2aAAp5, 162nd ASA Meeting, San Diego, 2010. 7 ISO 17497-1. Acoustics - Sound-scattering properties of surfaces - Part 1: Measurement of the random-incidence scattering coefficient in a reverberation room, Geneva: International 25
Page 1 and 2: Toronto, Canada International Sympo
Page 3 and 4: Table 1: Room Acoustic Parameters i
Page 5 and 6: scattering coefficients have been a
Page 7 and 8: prediction of C 80 it is important
Page 9 and 10: SPL(dB) can be some influence from
Page 11 and 12: is used for separating multiple imp
Page 13 and 14: p x E-1 Impulse response recordings
Page 15 and 16: SPL / Noise (dB) an indicator wheth
Page 17 and 18: Ts (ms) SPL (dB) Statistics Active
Page 19 and 20: 4.3 Different excitation stimuli Fo
Page 21 and 22: R3 at 4,55 m R2 at 6,84 m R5 at 8,9
Page 23: In Figure 16 measured and simulated

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