This paper deals with the comparison of voltage and current driving units in an active audio system. The effect of the audio amplifier control on the current coil of an electrodynamic loudspeaker is presented. In voltage control topology, the electromagnetic force linked to coil current is controlled through the load impedance. Thus, the electromechanical conversion linearity is decreased by the impedance variation, which implies a reduction of the overall audio quality. A current driving method could reduce the effect of the non-linear impedance by controlling the coil current directly, thereby the acceleration. Large signal impedance modeling is given in this paper to underline the non-linear effects of electrodynamic loudspeaker parameters on the coupling. As a result, the practical comparison of voltage and current driven methods proves that the current control reduces the voice coil current distortions in the three different loudspeakers under test.
Authors:
Pillonnet, Gaël; Sturtzer, Eric; Rossignol, Timothé; Tournier, Pascal; Lemarquand, Guy
Affiliations:
University of Lyon, Lyon, France; ONSemiconductor, Toulouse, France; Universite du Mans, Le Mans Cedex 9, France(See document for exact affiliation information.)
AES Convention:
134 (May 2013)
Paper Number:
8844
Publication Date:
May 4, 2013
Subject:
Transducers
Click to purchase paper as a non-member or you can login as an AES member to see more options.
No AES members have commented on this paper yet.
To be notified of new comments on this paper you can subscribe to this RSS feed. Forum users should login to see additional options.
If you are not yet an AES member and have something important to say about this paper then we urge you to join the AES today and make your voice heard. You can join online today by clicking here.