Adaptive method for detecting parameters of loudspeakers

Abstract

The method makes possible the determination of loudspeaker parameters in real operation through a measurement of the moving-coil current im and it contains the following steps: 1) The measurement of the moving-coil current im resulting from the excitation of the loudspeaker using a known input signal ue; 2) The simulated estimation of the moving-coil current for the same input signal using an equivalent electrical network and a time-discrete model that is derived therefrom by wave digital realization; 3) The change of the parameters in the loudspeaker model through a preceding determination of starting values and the minimization of the average squared error from the measured and simulated moving-coil current, using a gradient method. The equivalent network contains a series circuit of two transformers, the first transformer on the secondary side having an inductor (Ls), and the second transformer on the secondary side having the parallel circuit of a resistor (1/r), a capacitor (M), and a third transformer.

Dependencies are inferred from the claim text.