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Examination of a novel organ pipe construction with blown open tongue

: Rucz, Péter; Angster, Judit; Miklós, András

Vorländer, M. ; Deutsche Gesellschaft für Akustik -DEGA-, Berlin:
Fortschritte der Akustik. DAGA 2016. DVD-ROM : Aachen : 14.-17. März 2016 : 42. Jahrestagung für Akustik
Berlin: DEGA, 2016
ISBN: 978-3-939296-10-2
ISBN: 3-939296-10-4
Jahrestagung für Akustik (DAGA) <42, 2016, Aachen>
Conference Paper
Fraunhofer IBP ()

In a traditional pipe organ the pipe ranks are composed of labial (flue) and lingual (reed) pipes. Both kinds of ranks are tuned and voiced to a nominal windchest pressure. Changing this pressure not only affects the volume of the radiated sound but both the pitch and the timbre of the pipes. This means a strict limitation to the dynamic range of these pipe ranks.
In this contribution a new construction is examined that can possibly have an extended dynamic range: organ pipes with blown open tongues. These pipes have three main parts. From the windchest air is first conveyed into a small pressure tank which functions as the pipe foot. On the inner side of the pressure a blown open tongue is mounted. The other side of the tongue faces the resonator that can have various shapes. Contrary to traditional lingual pipes which have blown closed tongues, the blown open tongue can operate in a very wide range of driving pressures. The paper focuses on experimental investigations and discusses the results of laboratory measurements performed on experimental pipes. In addition, a simplified model of the new construction is established explaining the observed phenomena.