Abstract
Some methods for detecting air leakage in an in-ear device, such as an earbud, may utilize in-ear microphones, which can be affected by factors including occlusion, ambient noise interference, and performance variations. This disclosure details a system for assessing acoustic seal integrity by measuring the electrical impedance of the device's microspeaker. By using a headphone amplifier that may include current/voltage sensing capabilities, the system can dynamically characterize the speaker's impedance and track its resonance frequency (Fo). The acoustic load of a sealed ear canal can be reflected in the speaker's electrical impedance, where air leakage may cause a measurable shift. This technique may provide a way to monitor the fit of the in-ear device, which can be used to enhance the performance of features such as active noise cancellation, bass enhancement, and howling mitigation.
Creative Commons License
This work is licensed under a Creative Commons Attribution 4.0 License.
Recommended Citation
N/A, "Evaluating the Acoustic Seal of an In-Ear Device by Analyzing Speaker Driver Electrical Impedance", Technical Disclosure Commons, ()
https://www.tdcommons.org/dpubs_series/8829