Forum Acusticum Lyon 2020
KLIPPEL at Forum Acusticum
Dates: April 20th - 24th, 2020
Location: Lyon, France
Paper Presentation by Wolfgang Klippel
Paper Session 1: "Modeling Balanced Armature Transducers at High Amplitudes"
It will take place in the session S417: "Miniature Electroacoustic Transducers for In-ear Applications (Child/Oral)" on 20th April 2020, 10:50 am - 2:30 pm.
Abstract: Electromagnetic transducers using a balanced armature play an important role in hearing aids and in-ear headphones because they generate required sound output at high efficiency. This paper investigates the transfer behavior at high amplitudes and develops a lumped parameter model of this transducer which considers the influence of nonlinearities caused by the geometry and material properties. The nonlinearities and other free parameters of the model are determined by sensing electrical signals at the transducer terminals only. The parameters are important for optimal transducer design, adjusting the armature in production and cancelling the nonlinear distortion actively by nonlinear, adaptive control.
Paper Session 2: "Optimal Loudspeaker Design by using Adaptive, Nonlinear Control"
It will take place in the session S175: "Transducers and Control" on 22nd April 2020, 8:30 am - 11:50 am.
Abstract: Traditional loudspeaker design requires a compromise between maximum SPL, sound quality, size, weight, cost and energy consumed by the audio device. Nonlinear adaptive control can compensate for the undesired signal distortion, protect the transducer against overload, stabilize the voice coil position and cope with time-varying properties of the suspension. The paper presents a new design concept for active loudspeaker systems that uses the new degree of freedom provided by DSP to use transducers with significant nonlinearities and modal resonances to increase efficiency, voltage sensitivity of the electro-acoustical conversion while using a minimum of hardware resources and energy.
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