If the noise pretty much stays the same (i.e. if you can characterize it) you could attempt to do a deconvolution of the noise to clean up the input signal. The problem with this technique of course is that it is highly susceptible to noise-- hrm..
Look up "Optimal Filters" or the Wiener filter (or matched filters)- these will do the trick. Again, the unfortunate part here is that this may require quite a bit of reading and the code can by quite stumpy to debug.
Check out Numerical Recipes (in your favorite language). I'm sure they have code for that.
alex
At 3:39 PM +1100 11/17/06, Tommy Braas wrote:
>I've been searching around trying to find a way to get rid of some pink noise from a USB audio input device, comprising the sampling unit and a pre-amp for phono recording. The pink noise is only generated when the pre-amp is in use.
>
>I've found plenty of algorithms for the creation of pink noise, however precious few for the removal of same. I am not a DSP expert and I was wondering if anyone would have some idea as to what direction I should take in resolving this issue. Is there an easy way of filtering the noise out?
>
>Thanks,
>
>\tommy
>
>
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