In common use the word noise means unwanted sound or noise pollution. In broader sense the film grain or even advertisements in web pages can be considered noise. In electronics noise can refer to the electronic signal corresponding to acoustic noise (in an audio system) or the electronic signal corresponding to the (visual) noise commonly seen as 'snow' on a degraded television or video image. In signal processing or computing it can be considered data without meaning; that is, data that is not being used to transmit a signal, but is simply produced as an unwanted by-product of other activities. In Information Theory, however, noise is still considered to be information.

In many of these areas, the special case of thermal noise arises, which sets a fundamental lower limit to what can be measured or signaled and is related to basic physical processes at the molecular level described by well known simple formulae.

Environmental noise

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SAVE $7 - Panasonic RP-HJE240K Black noise-isolating earbuds $17.99 http://dealnay.com/40852 #headphone #offer #ad
e_bargains (Electronic Deals) Sat, 07 Nov 2009 00:50:33 -0000
SAVE $7 - Panasonic RP-HJE240K Black noise-isolating earbuds $17.99 http://dealnay.com/40852 #headphone #offer #ad
@_paahk eu estava ouvindo Noise ai ele perguntou: você está ouvindo U2? kkkk esse entende de música (y)
juliaguiar_ (Júlia Aguiar) Sat, 07 Nov 2009 00:50:25 -0000
@_paahk eu estava ouvindo Noise ai ele perguntou: você está ouvindo U2? kkkk esse entende de música (y)
there appears to be a mysterious beeping noise in my living room that happens every five mins...and i cant find it!
erinhamill (Erin Hamill) Sat, 07 Nov 2009 00:49:51 -0000
there appears to be a mysterious beeping noise in my living room that happens every five mins...and i cant find it!
@arodenis: make a loud obnpxious noise. Look at them and look down at ure phone or computer like ure textin }Blades dont need reloading.{
leo3luke (Leo Luke) Sat, 07 Nov 2009 00:49:42 -0000
@arodenis: make a loud obnpxious noise. Look at them and look down at ure phone or computer like ure textin }Blades dont need reloading.{
My car is making a humming / growling noise while I'm driving over 40mph. Wth is that!?
mattwhite6580 (Matt White) Sat, 07 Nov 2009 00:49:34 -0000
My car is making a humming / growling noise while I'm driving over 40mph. Wth is that!?
sometimes a good wallop is all it takes! e.g. for funny laptop fan noise, car dents, gas pains, and my face when i'm lazing out.
bzing (bzing) Sat, 07 Nov 2009 00:49:10 -0000
sometimes a good wallop is all it takes! e.g. for funny laptop fan noise, car dents, gas pains, and my face when i'm lazing out.

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