3 ms·
That's true, of course. But it's much harder to actively cancel higher frequencies. This is why noise cancelling works brilliantly on an airplane (relatively lo
by kevincennis 8y ago
That's true, of course. But it's much harder to actively cancel higher frequencies. This is why noise cancelling works brilliantly on an airplane (relatively low frequency background noise) but it does almost nothing to filter out the sounds of conversations around you.
- erikpukinskis 8y agoI always thought it was because noise cancelling can only block repeated waves (like the sound of an engine whirring) but conversation is constant changing sound so it can’t be blocked.
- hammock 8y agoMuch easier to match pace with a wave with long wavelength than one with short
- deleted 8y ago[deleted]
- michaelcampbell 8y agoYes, but the question was essentially, "does the sound it cancels out and you don't hear still hurt you". If you still hear it, you're answering something else.
- lodi 8y agoHigh frequencies are passively attenuated by the foam inside the earcups. It's the mid frequencies (speech, etc.) that survive both active and passive noise cancellation. Still, a high end pair of ANC headphones does a good job on speech/tv if you have some soft music playing through them.