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主动降噪与被动降噪的区别

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发表于 2014-8-26 23:49:34 | 显示全部楼层 |阅读模式

主动降噪与被动降噪的区别
Active vs. passive noise control

Noise control is an active or passive means of reducing sound emissions, often for personal comfort, environmental considerations or legal compliance.


Active noise control is sound reduction using a power source.
Passive noise control is sound reduction by noise-isolating materials such as insulation, sound-absorbing tiles, or a muffler rather than a power source.




Active noise canceling is best suited for low frequencies.
For higher frequencies, the spacing requirements for free space and zone of silence techniques become prohibitive.


In acoustic cavity and duct based systems, the number of modes grows rapidly with increasing frequency, which quickly makes active noise control techniques unmanageable.


Passive treatments become more effective at higher frequencies and often provide an adequate solution without the need for active control.



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发表于 2020-1-9 10:35:39 | 显示全部楼层
学习学习主动降噪与被动降噪的区别
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