Mains Hum

[phamtec]

I recorded a band about 1 month ago, and the only line I could get was a line with a large amount of mains hum.

It was that or nothing, so I decided to go ahead anyway.

I recorded a fair chunk of the hum which was continuous, and I have been fiddling around with it in PT now.

I want to loop the hum, and then invert it back in again with the signal to cancel.

If I try on a very small section, the NUM cancels nicely.

My problem is that my "looped hum" starts to drift and then is summed with varying degrees over the other sound, variously increaseing the hum etc.

Has anybody tried to do this?

If I get a perfect loop of the hum, what are the chances of this technique actually working?

[Sugarite]

Getting a perfect loop means calculating the wavelength with sample acuracy. I could do it, but damned if I could show/tell you how to do it. Being a laborious task I'd charge you out the ass for it too. Just record another show if you can't get it within an hour's work.

[phamtec]

Back to my original question, can this approach work even if I get a perfect loop?

The math is pretty simple for a "perfect loop" actually, so that's no prob. I just wondered if anybody else had tried it this way.