engleski

Estimation of loudspeaker drivers parameters

Thiele and Small have established an analogous circuit for loudspeaker driver analysis on low frequencies. Most measuring systems extend that model with circuits, serially added to voice coil resistance, that simulate lossy voice coil inductor at higher frequencies. This paper discusses three types of models for lossy inductor: L2R, L3R and L2RK (Thorborg) model that uses semi-inductance element. The physical explanation of these models is given by using transformer that couples voice coil and magnet pole piece. Next, the paper shows use of linear and nonlinear least square error (LSE) minimization method for the estimation of lossy inductance and Thiele-Small parameters. In order to achieve the robust estimation, a semi-analytic solution for setting initial parameters and iterative implementation of LSE method is defined. Experimental work shows that L3R and L2RK models give better results than standard L2R model. L2RK model is most accurate, but for use in simulations with standard circuit elements the L3R model is preferable.

Loudspeaker driver parameters; voice coil inductance estimation; least square error minimization

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