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13.
Test signal for identification of nonlinear response in electromechanical system [Elektronski vir]
Prezelj, Jurij, strojnik ; Čudina, Mirko
Fullrange loudspeakers are used in this article as an example of electromechanical system with nonlinear behaviour. Fullrange loudspeakers tend to have diameters smaller than 6%. Due to their small ...size they have to work with long cone excursions to achieve sufficient sound pressure levels in lower frequency range; therefore they are prone to the nonlinear distortion. Different methods were already developed for identification of different types of nonlinear distortions produced by electromechanical system. All these methods use well known test signals together with extensive digital signal processing, especially transformations from time domain into frequency domain and vice versa. Only few researchers observed nonlinear distortions in the original time domain; however they used only well-established test signals. A different test signal is proposed in this article. New test signal enables very fast and lucid identification of cumulative nonlinear distortions. By using this proposed test procedure, the nonlinear effect can be easily quantified for the purpose of comparing and evaluating different electromechanical systems. A new approach of incorporating a simple nonlinear operator into the convolution integral, for the purpose of simulating the nonlinear responses, is introduced in this article as well. Results of measurements, using proposed signal, and simulations, using convolution with incorporated nonlinear operator, are in good agreement and validate each other.
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