Increased interest has been witnessed over the past decades for techniques measuring the vibration of a loudspeaker membrane. In this proceeding, vision methods have been adapted to measure the displacement of the cones of low-frequency drivers. The movement of the membrane is recorded with industrial or consumer market high-speed cameras with frame rates greater than or equal to 240 fps. The measured displacement shows acceptable to very good agreement with the one measured by a laser vibrometer, depending on the camera model. The displacement of the membrane, coupled to the measured electrical impedance, can be used to retrieve the small signal parameters or some non-linear parameters of the speaker. Finally, the vision methods are used to retrieve the vibration patterns of the membrane.

Authors: Durand-Texte, Thomas; Melon, Manuel; Simonetto, Elisabeth; Durand, Stéphane; Moulet, Marie-Hélène
Affiliations: Le Mans Université, Le Mans, France; Laboratoire Géomatique et Foncier, Le Mans, France; Centre de Transfert de Technologie du Mans, Le Mans, France(See document for exact affiliation information.)
AES Convention: 144 (May 2018) Paper Number: 9929
Publication Date: May 14, 2018
Subject: Loudspeakers-Part 2

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