noise if you're at like a big time gaming convention a concert or a
sporting event it might be part of the experience but the incessant sound of a
jet engine when you're on a plane or that annoying coworker in the next
cubicle who won't shut up about the missing stapler can drive you out of
your mind so how do we control unwanted environmental noise without strapping
pillows to our heads enter active noise
control a technology for reducing irritating background noise that most
often appears in the consumer Market as noise cancelling headphones so how do
they work well surprisingly they actually block noise with um more noise
wait what how the heck does that work lonus are you talking about white noise
or something actually not exactly although it might intuitively seem like
canceling out noise with other noise doesn't make any sense the technology
relies on what's actually a pretty straightforward principle of physics
even if you slept through your classes as you probably know regardless of what
kind of student you were sound travels in waves and waves have Peaks and
troughs or valleys like you'd see if you were hanging out at the beach if two
waves combine they create a resulting wave that is basically the sum of the
original two so if you have two waves
that meet so that the peaks of one wave end up exactly with the peaks of another
it'll actually dramatically increase the amplitude on the other hand if the Peaks
line up exactly with the troughs of the other then we say they are out of faves
and the waves can cancel each other out completely so noise cancelling
headphones use this principle by listening to the background noise with a
dedicated microphone or microphones and
producing outof phase sound or anti-noise that literally destroys
incoming soundwaves before they reach your ear
combine this with special noise absorbing material built into the
headphone cups in some models and you've got some pretty serious sound isolation
so if you want to pick up a pair of noise cancelling cans to help you focus
at work or just block out the screaming kid that lives above you what should you
consider before forking over your cash to Bose or whoever else well one of the
biggest concerns with this kind of headphone is battery life unlike regular
headphones which usually just run off the power provided by your PC or
smartphone or whatever else has a headphone jack headphones with active
noise control need a separate power source usually a battery so pay
attention for this when you're looking through reviews especially as some
models won't mention at all how long it
takes for the battery to die and whether you can continue to use them when
they're not powered you should also consider how comfortable your new noise
cancelling headphones will be because the extra electronics needed to mask
outside sound does add extra weight and
bulk and a poorly designed pair of heavy phones may not be comfortable for
extended use and then finally for you audio files out there don't expect the
same kind of expansive Sound Stage as
you would have expected from an open-backed headphone as noise
cancelling sets are closed to keep out as much Ambient sound as possible still
though many headphones with active noise control do offer solid sound quality
good thing too as noise cancelling headphones do tend to be more expensive
than their passive counterparts so don't be completely put off with it even if
it's not the kind of thing you would sit in your easy chair and listen to but
then what if you don't want to have to wear headphones to block out distracting
sounds a number of companies are actually now making speakers that
feature the same active noise control system imagine that a speaker embedded
in your car's headrest to drown out road noise we've even seen large scale noise
cancellation deployed at the Eurovision song contest to drown out crowds booing
performers based on what country they're from an interesting application for sure
but I wouldn't expect to see it at your local football stadium anytime soon
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