I know nothing about this subject, but my instinct would tell me that anc would actually be protective. If you phase out sound, it seizes to exist, right? That is the whole point of it?
Again, pure instincts, don’t know shit myself.
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WhoPutDisHere@lemmynsfw.com 4 weeks agoANC isn’t protective in any way. If anything it’s probably just as damaging. It’s taking the outside signal and flipping it 180 (out of phase) and putting that in your ear to eliminate it.
Remote Audio isn’t fucking around. Those cans squeeze the shit out of your head to get that -45db, but they work very well.
Drummyralf@lemmy.world 4 weeks ago
BearOfaTime@lemm.ee 4 weeks ago
*ceases, FYI (not being snarky, maybe autoincorrect got you on voice to text)
Drummyralf@lemmy.world 4 weeks ago
Thanks for the heads up. Non-native, always willing to learn.
englislanguage@lemmy.sdf.org 4 weeks ago
This is partially correct, partially wrong.
As many have commented, flipping a signal by 180° cancels it out. However, this is only true for static noise though. Transient noise cannot be canceled out completely, because you would need to see into the future to know which signals to play to cancel out the noise.
The ANC headphones I own mainly cancel noise through passive shielding of the ears. The “active” noise canceling feature is not contributing a lot.
HelixDab2@lemm.ee 4 weeks ago
That’s just not true.
Your ear largely hears things through changes in air pressure. Projecting the same frequency and amplitude at the opposite phase prevents the change in air pressure in the first place. It’s literally cancelling the sound.
WhoPutDisHere@lemmynsfw.com 4 weeks ago
If you had loudspeakers on the outside of your head, and passive attenuation in your ears, yes that would reduce pressure for you, but everyone else would have experience an increase. But adding more pressure in the cavity of your ear to reduce pressure makes very little sense.
laughterlaughter@lemmy.world 4 weeks ago
You’re so wrong about this. ANC pretty much eliminates pressure inside the ear canal. That’s how ANC works. No pressure waves, no sound, no damage.
HelixDab2@lemm.ee 4 weeks ago
You’re not adding more pressure anywhere; you’re cancelling that pressure out.
BearOfaTime@lemm.ee 4 weeks ago
Except that’s exactly how nose canceling ear phones work. It’s not like that have an external speaker projecting sound 🤦🏼♂️
numberfour002@lemmy.world 4 weeks ago
Mine work like this: “Got your nose. Neener neener neener.”
WhoPutDisHere@lemmynsfw.com 4 weeks ago
Holy shit, buddy. Yes. We flip a signal 180 degrees out of phase and that added pressure pushes the outside wave down. There is at no point a reduction of pressure in your ear, it’s just more pressure that makes it so you can’t hear the sound you are trying to remove. The perception of sound and air pressure are not the same thing.