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Comparison of two methods of sound power measurement of flue organ pipes

: Angster, Judit

Bresin, Roberto (Ed.) ; Royal Institute of Technology, Stockholm:
SMAC 2013, 4th Stockholm Music Acoustics Conference. Proceedings : July 30 - August 3, 2013, KTH Royal Institute of Technology, Stockholm, Sweden
Berlin: Logos Verlag, 2013
ISBN: 978-3-8325-3473-8
Stockholm Music Acoustics Conference (SMAC) <4, 2013, Stockholm>
Fraunhofer IBP ()

The Fraunhofer IBP realized with 10 organ builder companies from 8 countries a research project, which was supported by the European Union and dealt with the matching of the pipe organ to the room. The aim was to assist organ builders already during the planning phase of an instrument. An important parameter for acoustic design is the radiated sound power of the instrument, and thus of the pipes. It was planned to find out a relatively simple method allowing the serial determination of the sound power of numerous pipes. With regard to the specific features of the sound of an open flue pipe the reverberation room procedure was selected from possible measurement methods to determine the sound power. Measurements were carried out to show the influence of wind pressure, pitch and geometry (scaling) of the flue organ pipes on the sound power. The measurements were significantly influenced by the strong interaction of the harmonic spectrum of the pipe sound with the eigenmodes of the reverberation room and by the coherent radiation of both point-like sound sources at the mouth and open end of the flue organ pipe. In a second measuring procedure the measurements were performed by a microphone-array system in the anechoic room. The results as well as the advantages and disadvantages of the measuring methods and a view of other possibilities for the detection of the sound power of flue organ pipes are discussed.