Reduce Audio Noise. How ?

Hello,
I have a audio need some filters to reduce the noise on it the sample is below any suggestion how can i do that. please ?!
Sample:
http://www.multiup.org/download/018eb15e17cba2e41791ea812c760e8b/01.mp3
Regards,

I couldn't listen to your file because the upload site you used is full of pop ups and wants me to install some extra software--something I'm not willing to do unless I know a lot more about it. You might want to consider using something like box.net.
However, as a generic answer, in Audition have a look under Effects/Noise Reduction & Restoration.
Basically, you find a section of pure noise (i.e. no useful recording going on) and capture a noise print. Then you select the whole file, adjust the amount of noise reduction to a compromise between artefacts and how quiet you go then run the process. FYI, best results are often obtained by doing several subtle passes rather than trying for dead quiet all at once.
However, the above implies electronic hiss/noise. Your options are different/more limited if you're talking about trucks driving by outside or something.

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I know that it is a bit late to reply but that is the perfect topic for what I am looking for!
I am currently working with acquisition systems using either PCI-6221 or PCIe-6321. Those systems are exactly the same but the results are different (see picture enclosed). We can see spikes and noise with the PCIe-6321 while we have the same conditions of measurements.
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In one of the system equipped with PCIe-6321, I replaced all the devices like cables, detectors, motors and it doesn’t change anything. I also swapped the computer for one equipped with PCI-6221 and it works fine. It means that the problem really comes from the acquisition card.
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Attachments:
Difference PCIe6321 and PCI6321.jpg ‏136 KB

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deco,
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http://www.ni.com/ask

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