Vibroacoustic Characterization and Modeling of Balanced Armature Receivers in Hearing Aids

Birgitte Steen Bække
The balanced armature receiver (BAR) is a high-efficiency and high-fidelity, miniature loudspeaker that is used in hearing aids. The small transducer converts an electrical audio signal into sound by electrodynamic excitation of a thin armature, balanced between a set of permanent magnets, to drive a membrane. It is thus a multi-physical device, whose working principles span the electromagnetic, mechanical and acoustic domain.


The main objective is to build a complete physical description of the working principles of the BAR. The description will comprise of an interplay between analytical models and numerical simulations, supported by practical measurements of receiver performance. First, the BAR will be modelled as an isolated system, and the models will subsequently be expanded to include the context of the hearing aid.


An improved understanding and modeling of the physical behavior of the BAR, can be used to improve the performance of hearing aids in terms of signal-to-noise ratio, enhancing speech intelligibility for the user, and power efficiency.


Supervisors: Vicente Cutanda Henriquez, Frieder Lucklum, Finn Agerkvist  - DTU Elektro


Birgitte Steen Bække
PhD student
DTU Electro
+45 45 25 39 42