传统的降噪手段称为被动降噪,是指阻隔吸声的方式实现降噪,然而厚重的声学包裹不仅对令人烦躁的低频噪声无济于事,同时影响排风类家电的出风量及散热性能。主动降噪(ANC)技术则是指利用麦克风侦听噪声声波,并经过处理发出反向声波,二者在传播过程中相互干涉抵消后实现降噪的技术。
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