How to get rid of that Blur sound?

Sometimes if not always when i take a video with my mobile, i can hear in the back round a weird blur sound, i'm sure some of you know it, how can i get rid of that? Using my pc or whatever, like downloading a program or something? I'm using an Iphone 4

I know on adrobe photoshop there's a version for video but not sure of name or how much it costs but if you don't look into that then a tripod is the old fashion wayxx
Oh yeah there's another thing, you can only get this on apple computers but it called logic, its a softwere all about sound xxx

Iphone 4 > video sound noise, impedance, white noise, background, buzz, hissing, feedback,
https://discussions.apple.com/...0&tstart=0

it maybe the location of device, picking up echoes from surroundings,
or the device itself picking up internal motor sounds and frequency of noise from weak capacitors and motherboard,

worn or aged components could cause increase in static from parts, you could try external microphone, and compare sound, if no difference, the noise separation from voice or recording may be location where recorded, causing types of sound to drown out actual

may require video editor with sound filters for noise,

Adobe Premiere Pro CS6
http://www.adobe.com/.../premiere/
Avid Media Composer 6
http://www.avid.com/US/products/media-composer
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VirtualDub
http://www.virtualdub.org/
http://forum.videohelp.com/threads/304689-Audio-hiss-removal-in-VirtualDub

Avidemux
http://fixounet.free.fr/avidemux/
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conflict term noise image versus noise sound in category of video,
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https://discussions.apple.com/...0&tstart=0
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Audacity (sound)
http://audacity.sourceforge.net/
http://manual.audacityteam.org/index.php?title=Noise_Removal.