Parameter identification method of nonlinear fractional order loudspeaker

Abstract

The invention relates to a parameter identification method of a nonlinear fractional order loudspeaker. The signal generator generates a small-amplitude analog program signal and applies the small-amplitude analog program signal to the loudspeaker, an electrical impedance curve and a displacement transfer function curve of the loudspeaker measured in the process are input to the order fitting module, and three constant parameters are output through least square estimation; the signal generator generates a large-amplitude simulation program signal and applies the large-amplitude simulation program signal to the loudspeaker, current and voltage data measured in the process and three constant parameters output by the order fitting module are input into the discrete model module, and the discrete model module outputs the displacement, the speed and the error of the vibrating diaphragm. The output of the discrete model module is taken as the input of a parameter estimation module, and all identification parameters through adaptive iterative operation in the parameter estimation module are obtained. The method is high in accuracy, does not need decoupling and decoherence errors, and does not need any prior information.

Description

technical field [0001] The invention relates to a parameter identification method of a nonlinear fractional order loudspeaker. Background technique [0002] Dynamic speakers usually work under large signal conditions, and their inherent nonlinear factors will produce additional distortion components in the reproduced sound, thereby affecting the perceived sound quality. Nowadays, predicting the large-signal behavior of loudspeakers, reducing nonlinear distortion, and improving acoustic output characteristics through active control means and digital signal processing technology has been widely valued and applied. [0003] The accuracy of the nonlinear model of the loudspeaker and its parameters determines the quality of the active control effect. In recent years, with the rapid development of fractional calculus in viscoelastic dynamics and other fields, a fractional loudspeaker model has been proposed, which can better Describe the electroacoustic characteristics of loudsp...

AI Technical Summary

Problems solved by technology

The disadvantage of the above method is that it is not applicable to the identification of fractional-order loudspeakers, because the system may have strong nonlinearity, and the IIR structure corresponding to the transfer function of the fractional-order system is difficult to realize, the above-mentioned iterative method must be improved

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