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Sound Strength Calibration Methods

Australian Acoustical Society, NSW Division, 2010
Publication Date
  • Musicology
  • Physics


Microsoft Word - ICA2010_Paper 25.doc Proceedings of 20th International Congress on Acoustics, ICA 2010 23-27 August 2010, Sydney, Australia ICA 2010 1 Sound Strength Calibration Methods C.C.J.M. Hak (1), R.H.C. Wenmaekers (2), J.P.M. Hak (3), L.C.J. van Luxemburg (2), A.C. Gade (4) (1) Eindhoven University of Technology, Den Dolech 2, BWK/BPS, 5600 MB Eindhoven, The Netherlands (2) Level Acoustics BV, De Rondom 10, 5612 AP Eindhoven, The Netherlands (3) Acoustics Engineering, Groenling 43-45, 5831 MZ Boxmeer, The Netherlands (4) Gade & Mortensen Akustik A/S, Hans Edvard Teglers Vej 5, K 2920 Charlottenlund, Denmark PACS: 43.20 Ye, 43.38 Ja, 43.55 Mc, 43.58 Vb ABSTRACT The sound strength G is a room acoustical parameter used to investigate the sound distribution in a hall or to compare the loudness between different halls. ISO 3382-1 describes several methods to measure G. The accuracy of a G measurement depends on the accuracy with which the power level of the sound source can be determined or with which the measurement system can be calibrated. In this research the different available sound strength calibration methods have been compared using a standard omnidirectional (dodecahedron) sound source. Using the same measurement equipment, different (system) calibration methods are compared: 1] free-field measurement in an anechoic room, 2] sound intensity measurement in an anechoic room, 3] diffuse-field measurement in a reverberation room, 4] near-field measurement on stage in a concert hall. For method 1, measurements have been performed in a horizontal plane with white noise and exponential sweeps at various distances from the sound source. For method 2, intensity measurements according to ISO 9614-3 have been performed using white noise while scanning the sound source surface with a two microphone probe. For method 3, the direct method and the comparison method according to the ISO 3741 standard have been used to determine the sound power lev

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