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Communication Dans Un Congrès Année : 2012

Nonlinear losses in electro-acoustical transducers

Wolfgang Klippel
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Résumé

The mechanical and acoustical losses considered in the lumped parameter modeling of electro-dynamical transducers may become a dominant source of nonlinear distortion in micro-speakers, tweeters, headphones and some horn compression drivers where the total quality factor Qts is not dominated by the electrical damping realized by a high force factor Bl and a low voice resistance Re. This paper presents a nonlinear model describing the generation of the distortion and a new dynamic measurement technique for identifying the nonlinear resistance R¬ms(v) as a function of voice coil velocity v. The theory and the identification technique are verified by comparing distortion and other nonlinear symptoms measured on micro-speakers as used in cellular phones with the corresponding behavior predicted by the nonlinear model.
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Dates et versions

hal-00810564 , version 1 (23-04-2012)

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  • HAL Id : hal-00810564 , version 1

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Wolfgang Klippel. Nonlinear losses in electro-acoustical transducers. Acoustics 2012, Apr 2012, Nantes, France. ⟨hal-00810564⟩

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