Noise Canceling Headphones Period 7

the difference between a passive and a active one makes more noise and the other blocks the noise http://electronics.howstuffworks.com/gadgets/audio-music/noise-canceling-headphone3.htm

Noise-cancelling headphones reduce unwanted ambient sounds by using a mini computer called "active noise control." This involves using one or more microphones placed near the ear, and electronic circuitry which uses the microphone signal to generate an "anti-noise" signal. When the antinoise signal is produced by the speaker driver in the headphone, destructive interference cancels out the ambient noise as heard within the enclosed volume of the headphone. Noise cancellation makes it possible to enjoy music without raising the volume excessively. It can also help a passenger sleep in a noisy vehicle such as an airplane.

The difference is that passive headphones let sound through and noise reducing headphones cancels the sound before it hits the headphones.They are made of a material that block off sound outside of the headphones.http://electronics.howstuffworks.com/gadgets/audio-music/noise-canceling-headphone.htm

The difference between passive headphones and noise reducing headphones is noise reducing headphones have special material in them to block out sound from your surrounding, Noise Reducing Headphones record the sounds from your surroundings and then it plays its sound over your surrounding sounds. It is a Destructive Interference because when both sounds are combined they equal out each other. http://electronics.howstuffworks.com/gadgets/audio-music/noise-canceling-headphone.htm

The diffenence between
passive and active headphone
is that the passive still lets soiund
in while active lets no sound im.
Their very structure creates a
barrier that blocks
high-frequency sound waves.
They also add an extra level of
noise reduction by actively
erasing lower-frequency sound
waves. They actually create
their own sound waves that
mimic the incoming noise in
every respect except one.
http://electronics.howstuffworks.com/gadgets/audio-music/noise-canceling-headphone3.htm

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The Difference Between ‘Noise Isolating’ And ‘Noise Cancelling’ Headphones
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By Whitson Gordon on February 26, 2011 at 2:00 am

Noise-reducing headphones can be pretty helpful for getting things done, no matter where you are. If you’ve tried to invest in some, though, you’re probably pretty confused at all the options you have. The How-To Geek explains the difference between them all.You may have heard the term “noise-cancelling headphones” thrown around a lot, but people often mean noise reduction or noise isolation — they’re different theories in headphone technology that essentially keep noise out (and keep your music in). Noise cancelling headphones often have their own microphone, recording the outside atmosphere and creating a sound wave that actively cancels it out. Passive noise reduction merely creates a seal around your ears or in the ear canal that keeps out noise. As for which is best, it usually depends on your situation:

Passive reducing headphones use layers of high density foam that block the high frequency waves which will end up making them heavier than most headphones. With that foam stuff it eliminates 15-20 decibles, but to consider that airplane cabins can make up to 75-80 decibles thats where you want active headphones. They do everything that passing headphones do but more. With the high density gel they use they also use a system that will cancel out low frequency sounds. They do that by a computer that will hear for the sounds and will send a sound that will end up silencing it with a destructive interference. Thats how active headphones are better than passive headphones. I used http://electronics.howstuffworks.com/gadgets/audio-music/noise-canceling-headphone3.htm

Passive reducing headphones are acheived by using a blockling system that attempts to plug sound off from your ears. The destructive interference is created by a gel tip around the in ear headphones and a dense seal for around the ear headphones.Active reducing headphones use a destructive interference that makes a sound a that completely cancels out other sounds using a little computer chip called a read system. the site i used ---->http://www.ehow.com/about_5106048_passive-noise-reduction-headphones.html

Passive headphones let sound be heard when you use them. Active headphones don't let sound be heard when they are used. The reason the active headphones don't let you hear extra sound is because the head phones cause a destructive wave interference. The destructive interference cancels out the other noises around the headphones. Allowing no other sound to be heard while they are being used.
Link used
http://en.wikipedia.org/wiki/Noise-cancelling_headphones

The difference between passive and active headphones is that active noise reducing headphones have an extra level of noise reduction by erasing lowfrequency sound waves. The headphones accomplish this by alining the incoming waves crests with the outcoming waves troughs or vice versa. Therefore, creating a destructive inference, which cancels the two waves out. This lets the listener focus on the music, making it easier to hear. Passive noise cancelling headphones are just made to increase noise filtering properties. The link I used is http://electronics.howstuffworks.com/gadgets/audio-music/noise-canceling-headphone3.htm

Noise canceling headphones send out a second wave that is the opposite of what is around you. This wave creates a destructive interference. So that you dont need to have your music up very loud.

http://en.wikipedia.org/wiki/Noise_cancelling_headphones

Active noise reducing head phones have two different waves, the ones coming from the headphones and then one coming from the noise around them. They have the same amplitude and frequency. But the crests and troughs are arranged so that the crests of one wave lines up with the troughs of the other. Therefore, the two waves cancel each other out also known as a destructive interference. Passive noise reducing headphones are just constructed to maximize noise filtering properties. Passive headphones have serious limitations.

http://electronics.howstuffworks.com/gadgets/audio-music/noise-canceling-headphone3.htm

Active noise reducing headphones are headphones that have a tiny computer in them that sends out a wave that is identical to the sounds that you don't want to hear. The wave has to be identical so it can balance the noise with the outside noise. This is a destructive interference. Passive noise reducing headphones just try and block out all of the noises so you do not hear them.

http://electronics.howstuffworks.com/gadgets/audio-music/noise-canceling-headphone3.htm

Passive noise reducing headphones, block the outside noises, so that they don't reach your ears. Active noise reducing headphones use a computer to send out an identical wave to block out the sound wave you don't want to hear. Active noise headphones use an identical wave because that wave will cancel out the other wave, causing a destructive wave.

http://www.ehow.com/about_5106048_passive-noise-reduction-headphones.html

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