Multiphysics Analysis of Induced Acoustic Noise in an Earbud Speaker

Abstract

Speakers can be sensitive to nearby electronics. Electrical traces carrying high frequency electrical currents can induce electromagnetic current in the voice coil of a speaker. The induced current can cause vibration of the voice coil thereby resulting in audible acoustic noise. This paper provides a Multiphysics simulation workflow to compute the force on voice coil due to the induced electromagnetic field from an aggressor coil placed in the vicinity of the earbud module.