Extracting the Fundamental Mode from Sound Pressure Measurements in an Acoustic Tube

R&D Team |  Publications

Abstract

Acoustic tubes are used to provide a load to loudspeakers or to measure material properties. If the wavelength is comparable to the diameter of the tube cross-modes can be excited. This paper demonstrates a method which allows to extract only the fundamental mode from the measurement of the sound-pressure response. The only requirement is the use of three microphones mounted into the sides of the tube-wall as well as a circular cross-section.

Panzer, Joerg: Extracting the Fundamental Mode from Sound Pressure Measurements in an Acoustic Tube; 147th AES Convention, New York, Oct 2019, Preprint 10238

The original paper is available at the Electronic Library of the AES.

A copy of the paper can be downloaded here as pdf-file [320kB]

The "Akustik Journal" (03/22) of DEGA published a German version of this paper. It is available here: Messung der Grundmode einer akustischen Röhre zu höheren Frequenzen

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