NDLI: A novel, cost-effective method for loudspeakers parameters measurement under non-linear conditions

Content Provider	IEEE Xplore Digital Library
Author	Faifer, M. Ottoboni, R. Toscani, S.
Copyright Year	2008
Description	Author affiliation: Dipt. di Elettrotec., Politec. di Milano, Milano (Faifer, M.; Ottoboni, R.; Toscani, S.)
Abstract	The linear model of the dynamic low-frequency loudspeaker is widely used nowadays, and it is well known how to assess its parameters from simple measurements. However, this is a small-signal model which well represents the behavior of a loudspeaker only when slight diaphragm displacements are considered. In many cases it is important to have a more accurate model which takes into account the nonlinear phenomena as well, for example during the development of a feedforward loudspeaker linearization system. It is quite simple to obtain such a model from the small signal one by introducing the dependence of the force factor Bl, the suspension stiffness $K_{ms}$ and the voice coil inductance $L_{e}$ from the diaphragm position x. More difficult is to assess these position-dependent parameters. In this paper, novel and low cost methods for the Bl(x) and $K_{ms}(x)$ identification are proposed. Some experimental result will be presented, and in particular a comparison between the large-signal, low-frequency behavior of the loudspeaker and its model (whose parameters has been estimated with the proposed methods) will be performed. Finally, this model has been employed in order to implement a simple model-based method for the loudspeaker linearization. Other experimental results will be reported and the capability of the method to reduce the second and third harmonic distortion at very low frequencies will be discussed.
Starting Page	562
Ending Page	568
File Size	431397
Page Count	7
File Format	PDF
ISBN	9781424422258
ISSN	10887725
DOI	10.1109/AUTEST.2008.4662681
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2008-09-08
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Loudspeakers Force Coils Suspensions Fitting Polynomials Inductance suspension stiffness loudspeaker nonlinearities loudspeaker linearization parameters estimation force factor
Content Type	Text
Resource Type	Article

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