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The anti-noise is an injection of the exact noise you hear but 180 degrees
out of phase and at the same amplitude of the noise. Therefore the waves cancel out and you dont here anything. Brent Bigler wrote: > Two questions about ANR headsets: > > 1. When Ive put them on the apparent noise is reduced. Thats fine > and dandy. But the brochures say something about "anti-noise," which > seems to be some kind of out-of-phase "good" noise that counteracts > the bad noise. I dont understand the technology well, but if thats > true, isnt the ANR circuitry just sending out more sound? If so, is > the actual amount of noise your ears register actually reduced? Or is > it just registered in a different way -- i.e., the hair cells are bent > over just as much, but not moving the way theyd normally move to > register the sound? > > 2. Every time I turn on an ANR circuit, I feel as if Ive entered a > tunnel. My ears feel a weird sort of pressure -- hard to explain, I > know -- and I just want to turn off the thing. Do other people feel > this too? Is that sensation something my ears are trying to tell me to > avoid? > > Thanks for any clarification. > > --Brent |
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