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Reflection functions of pipes

: Trommer, T.; Ausserlechner, H.; Angster, J.; Miklos, A.

Boone, M.M. ; Deutsche Gesellschaft für Akustik -DEGA-, Berlin; Acoustical Society of the Netherlands:
NAG/DAGA 2009, International Conference on Acoustics. Proceedings. Vol.3 : Rotterdam, 23 - 26 March 2009; Including the 35th German Annual Conference on Acoustics (DAGA)
Berlin: DEGA, 2009
ISBN: 978-3-9808659-6-8
Deutsche Jahrestagung für Akustik (DAGA) <35, 2009, Rotterdam>
International Conference on Acoustics <2009, Rotterdam>
Conference Paper
Fraunhofer IBP ()

The sound an organ pipe radiates is predominantly influenced by the resonator. In it sound waves travel back and forth between the lower end (consisting of upper lip, pipe mouth, languid) and the upper end being partially reflected as well as radiated from these ends. These reflections and herewith directly the pipe sound is dependent on different properties of which mainly contributing factors are the geometry of the resonator in size and shape (cylindrical, conical, diameter, length) as well as the attributes of the ends (open, closed, tuning geometries, mouth size). The first sound signal excites the stationary air column defined by the resonator. The reflected part of the sound signal from the upper end after being reflected from the lower end superimposes with the periodic sound emitted continuously by the sound source. In optimum this retroactivity leads to a steady state of the resonant circuit radiating the corresponding organ pipe sound. In order to model the resonant part of a pipe the reflection functions of both ends in dependency of the geometries are needed. These will be gathered by an especially developed method by means of time domain measurements on pipes with corresponding dimensions to in-situ employed organ pipes.