Supervision: Etienne Rivet

Project type: Semester project (bachelor) Semester project (master)

Finished

The electroacoustic absorber is an electroacoustic device for controlling the acoustic impedance of a closed-box electrodynamic loudspeaker diaphragm, in order to absorb the room modes at low frequencies. Using a dedicated electrical circuit (shunt, feedback...), the parameters of the resonator are modified to optimize the energy absorption according to the room specifications in which the loudspeaker diaphragm radiates. No study has focused so far on a multiple degree of freedom electroacoustic absorber using at least two electrodynamic loudspeakers, in order to improve the acoustic control bandwidth.

In this context, the proposed work is to design a model with combinations of loudspeakers and enclosure(s) using mechanical and acoustical analogies, then optimize the acoustic absorption with the help of simple resistive shunts. Finally a laboratory prototype will be asked (if time permits) to validate the proposed model and assess the acoustic properties of the concept.

Profile: Electrical engineering, Micro-engineering, Physics, Mechanics

Prerequisites: Electroacoustique (BA5) or Audio Engineering (MA1)

Context: Theory (25%), design (60%), measurement (25%)