i think what Joe means by this is what is commonly referred to as a vocal remover. meaning it takes out the center channel, and i believe that it's done using M/S processing on the stereo signal. i can tell you it likely won't involve CPU intensive tasks like FFT because they used to sell kits to remove vocals in the 1980s:
http://www.paia.com/ProdArticles/vocalzap.htm i might be misunderstanding but it sounds like that's what you're after. scott On Fri, Oct 12, 2012 at 10:55 AM, Joe White <[email protected]> wrote: > Ahh ok sure. Yeah you're right I think, it's annoying because in theory, L > - R should give you what's *not* in the centre. But that ends up not > being very useful anyway :) > > I'm no expert, but sounds like Mid-Sides could give you what you need, >> no? then you can get rid of the Mid and *voilà* : sides. > > > Eran, Mid-side is a different encoding to Stereo as you have 3 channels > instead of 2, meaning the mono signal is already available. > > Cheers, > Joe > > On 12 October 2012 10:49, i go bananas <[email protected]> wrote: > >> oops, sorry about the double reply Joe, i forgot 'reply to all' >> >> to turn a stereo signal into a mono one, yes it's L+R..but that's not >> what i wanted to do. I wanted to take ONLY the parts of a stereo mix which >> lie right in the middle. It would be basically the inverse of a stereo >> difference effect. >> >> To put it another way, Stereo difference removes those parts of the mix >> which are panned dead center. What i want to do is leave those parts, and >> then remove anything that isn't panned dead center. >> >> At first, i thought it would be as simple as just subtracting the stereo >> difference signal from the original mix. But when i actually tried it, it >> didn't work, and then also when i worked it out logically on paper, i >> realized that it's impossible just with simple arithmetic. >> >> >> >> My best guess, is that you could FFT the stereo difference signal to get >> it's spectral profile, and then subtract that from the original mix. Might >> give it a go some time. >> > > > > -- > Follow me on Twitter @diplojocus > > _______________________________________________ > [email protected] mailing list > UNSUBSCRIBE and account-management -> > http://lists.puredata.info/listinfo/pd-list > >
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