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首页> 外文期刊>Engineering >Real-Time Detection of Unstable Control Loop Behavior in a Feedback Active Noise Cancellation System for In-Ear Headphones
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Real-Time Detection of Unstable Control Loop Behavior in a Feedback Active Noise Cancellation System for In-Ear Headphones

机译：入耳式耳机反馈有源降噪系统中不稳定控制环行为的实时检测

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摘要

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.
机译：有源噪声控制在广泛的应用领域中被使用，以消除不需要的周围噪声。但是，基于反馈结构的控制系统的缺点是，在运行时由于控制路径的变化（在这种情况下，包括听者的耳朵），它们可能变得不稳定。尤其是当应用于主动降噪（ANC）耳机时，不稳定的风险与对听者的耳朵造成有害影响的风险相关，而听者的耳朵则在醒目位置暴露于扬声器。本文讨论了几种方法，可以在运行时对反馈ANC系统进行分析，以立即检测不稳定性。最后，提出了一种解决方案，该解决方案通过自适应滤波器在参数上识别开环行为，以随后评估有关稳定性的系数。

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