Optimization of electric shunt resonant circuits for electroacoustic absorbers

Hervé Lissek (1) , Romain Boulandet (1) , Etienne Rivet

1 EPFL - Ecole Polytechnique Fédérale de Lausanne

Sound absorption can be achieved in a relatively simple manner with passive or active electroacoustic absorbers. Electroacoustic absorbers are basically loudspeakers, the membrane of which is used as an absorber/reflector of sound, and the electric terminals of which are connected to a dedicated electric load. This electric “shunt” can be a simple electric resistor, or an active device employing feedback control on acoustic and/or electric quantities (aka. direct impedance control). Whilst the latter allows significant broadening of acoustic absorption performances that could not be obtained with simple passive resistors, it is also possible to find passive shunt alternatives that allows interesting acoustic performances without the use of expensive and energy consuming electric disposals. A simple configuration of shunt electric resonator is proposed as an alternative to active shunt for broadening the performances of passive electroacoustic absorbers.

Mots clés: electroacoustic absorbers; shunt resonant circuit; mode damping

Domaines: Acoustique [physics.class-ph]

Hervé Lissek, Romain Boulandet, Etienne Rivet. Optimization of electric shunt resonant circuits for electroacoustic absorbers. Acoustics 2012, Apr 2012, Nantes, France. ⟨hal-00811008⟩