WEBVTT

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noise if you're at like a big time gaming convention a concert or a

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sporting event it might be part of the experience but the incessant sound of a

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jet engine when you're on a plane or that annoying coworker in the next

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cubicle who won't shut up about the missing stapler can drive you out of

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your mind so how do we control unwanted environmental noise without strapping

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pillows to our heads enter active noise

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control a technology for reducing irritating background noise that most

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often appears in the consumer Market as noise cancelling headphones so how do

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they work well surprisingly they actually block noise with um more noise

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wait what how the heck does that work lonus are you talking about white noise

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or something actually not exactly although it might intuitively seem like

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canceling out noise with other noise doesn't make any sense the technology

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relies on what's actually a pretty straightforward principle of physics

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even if you slept through your classes as you probably know regardless of what

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kind of student you were sound travels in waves and waves have Peaks and

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troughs or valleys like you'd see if you were hanging out at the beach if two

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waves combine they create a resulting wave that is basically the sum of the

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original two so if you have two waves

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that meet so that the peaks of one wave end up exactly with the peaks of another

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it'll actually dramatically increase the amplitude on the other hand if the Peaks

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line up exactly with the troughs of the other then we say they are out of faves

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and the waves can cancel each other out completely so noise cancelling

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headphones use this principle by listening to the background noise with a

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dedicated microphone or microphones and

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producing outof phase sound or anti-noise that literally destroys

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incoming soundwaves before they reach your ear

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combine this with special noise absorbing material built into the

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headphone cups in some models and you've got some pretty serious sound isolation

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so if you want to pick up a pair of noise cancelling cans to help you focus

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at work or just block out the screaming kid that lives above you what should you

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consider before forking over your cash to Bose or whoever else well one of the

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biggest concerns with this kind of headphone is battery life unlike regular

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headphones which usually just run off the power provided by your PC or

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smartphone or whatever else has a headphone jack headphones with active

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noise control need a separate power source usually a battery so pay

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attention for this when you're looking through reviews especially as some

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models won't mention at all how long it

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takes for the battery to die and whether you can continue to use them when

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they're not powered you should also consider how comfortable your new noise

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cancelling headphones will be because the extra electronics needed to mask

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outside sound does add extra weight and

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bulk and a poorly designed pair of heavy phones may not be comfortable for

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extended use and then finally for you audio files out there don't expect the

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same kind of expansive Sound Stage as

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you would have expected from an open-backed headphone as noise

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cancelling sets are closed to keep out as much Ambient sound as possible still

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though many headphones with active noise control do offer solid sound quality

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good thing too as noise cancelling headphones do tend to be more expensive

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than their passive counterparts so don't be completely put off with it even if

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it's not the kind of thing you would sit in your easy chair and listen to but

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then what if you don't want to have to wear headphones to block out distracting

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sounds a number of companies are actually now making speakers that

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feature the same active noise control system imagine that a speaker embedded

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in your car's headrest to drown out road noise we've even seen large scale noise

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cancellation deployed at the Eurovision song contest to drown out crowds booing

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performers based on what country they're from an interesting application for sure

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but I wouldn't expect to see it at your local football stadium anytime soon

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speaking of things you won't find at a stadium anytime soon not that you would

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expect to find an online learning program at a stadium linda.com where you

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