This paper presents an extension of the standing-wave model of interference tubes for microphones by Ono et al. The original model accounts for three acoustic parameters: tube length, tube radius, and constant acoustic conductance per unit length. Our extension allows a varying conductance per unit length along the side wall. The assumptions behind the extended model and its ability to predict the frequency response of interference tubes are validated through simulations and by fitting the model parameters to frequency response measurements of a tube with varying conductance per unit length, using two different mountings. Results suggest that a tube with varying conductance per unit length is most effective at attenuating the off-axis sound if the conductance per unit length is decreased towards the tail end of the tube.

Authors: Bigoni, Francesco; Agerkvist, Finn T.; Brixen, Eddy Bøgh
Affiliations: Aalborg University, Copenhagen, Denmark; Technical University of Denmark, Kgs. Lyngby, Denmark; EBB-consult, Smørum, Denmark; DPA Microphones, Allerød, Denmark(See document for exact affiliation information.)
AES Convention: 145 (October 2018) Paper Number: 10094
Publication Date: October 7, 2018
Subject: Transducers—Part 3

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