[PD] stereo difference?

[Joe White]

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 <hard.off at gmail.com> 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.
>



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