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机械风扇式白噪音机（如Marpac/Yogasleep Dohm）通过内部真实风扇转动发声，无循环感但需插电、不可调节具体音效种类，只能靠旋转外壳调音色

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白噪音机category

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Unverified机械风扇式白噪音机（如Marpac/Yogasleep Dohm）靠真实风扇产生气流声，无电子采样循环感，音质自然，但只有单一风声、无法调音效种类、无耳机输出、需持续供电94% similar Unverified物理机械风扇型白噪音机（如Marpac/Yogasleep Dohm）通过内部风扇气流产生真实白噪音，无音源循环问题，但功能单一、不便携93% similar Unverified机械风扇式白噪音机（如Yogasleep Dohm）通过旋转外壳双圈开孔调节声音音调与音量，而非改变风扇转速，因此音质稳定但音量与音调联动调节、无法完全独立92% similar Unverified真机械白噪音机(如Marpac/Yogasleep Dohm)靠内置风扇实机发声，声音无循环感更自然，但只有单一风扇声、无法调种类且体积较大不便携91% similar UnverifiedMarpac/Yogasleep Dohm采用真实风扇气流发声，无音频循环、无USB充电(需插电)，音量靠旋转外壳开孔调节，无定时功能，是机械白噪音的代表型态90% similar

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