Bruhnken, C., Priese, S., Foudhaili, H., Peissig, J. and Reithmeier, E. (2012) Design of a Feedback Controller for Active Noise Control with In-Ear Headphones. Proceedings of Meetings on Acoustics, 18, Article ID: 040003.
http://dx.doi.org/10.1121/1.4755455

has been cited by the following article:

• TITLE: Real-Time Detection of Unstable Control Loop Behavior in a Feedback Active Noise Cancellation System for In-Ear Headphones

  AUTHORS: Sven Höber, Christian Pape, Eduard Reithmeier

  KEYWORDS: Active Noise Control, Feedback, Stability, Real-Time Analysis

  JOURNAL NAME: Engineering, Vol.7 No.12, December 17, 2015

  ABSTRACT: Active noise controls are used in a wide field of applications to cancel out unwanted surrounding noise. Control systems based on the feedback structure however have the disadvantage that they may become unstable during run-time due to changes in the control path—in this context including the listener’s ear. Especially when applied to active noise cancellation (ANC) headphones, the risk of instability is associated with the risk of harmful influence on the listener’s ear, which is exposed to the speaker in striking distance. This paper discusses several methods to enable the analysis of a feedback ANC system during run-time to immediately detect instability. Finally, a solution is proposed, which identifies the open loop behavior parametrically by means of an adaptive filter to subsequently evaluate the coefficients regarding stability.