介绍了一种采用动反馈式扬声器的管道有源自适应噪声控制系统，系统中动反馈扬声器既作为有源消声系统的执行元件，也作为检测控制效果的声传感器。
An active adaptive noise control system in ducts is proposed, which adopts a motional feedback loudspeaker not only as an noise controlling actuator but also as a detecting sensor.
分析了多媒体综合教室的声反馈啸叫问题的成因和常规消除声反馈啸叫的方法。
This article discusses the producing mechanism about sound feedback of loud-speaking system inside room and the methods and skills of restraining it.
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