[PD] a smooth crossfade for "equal" signals (freezing/unfreezing)

[Alexandre Torres Porres]

wow, thanks, but you lost me :)

anyway, I thought of an easy exit but more costy, by having the double as
much oscilators as copies that keep frozen.

I will try it,

Thanks again


2011/7/18 Mathieu Bouchard <matju at artengine.ca>

> On Fri, 8 Jul 2011, Alexandre Torres Porres wrote:
>
>  It seems now it's a matter of aligning the phases, but not sure how, good
>> night
>>
>
> Phase alignment has to be done by a slight temporary pitch shift. You can
> shift up or shift down, but in any case, you need to shift.
>
> If you do a plain linear cross-fade of signals (or a plain linear
> cross-fade of spectra, which is the same thing), it will automatically do
> this temporary pitch-shift, but will also do a temporary amplitude-drop at
> the same time.
>
> This is because if you have two dots on a circle representing two phase
> alignments at the same amplitude, and you go from one to the other, you will
> go inside of the circle, where the amplitude is lower. The centre of the
> circle represents silence. In the extreme case of complete reversal of
> phase, the crossfade will quickly go through the silence point. But each
> frequency will have a different crossfade, so, overall, the amplitude drop
> will rarely be great, except if you tend to have few partials.
>
> I'm thinking about phasor diagrams like http://en.wikipedia.org/wiki/**
> Phasor <http://en.wikipedia.org/wiki/Phasor> , which may be considered as
> a use of Argand diagrams (complex numbers plane).
>
> To keep constant amplitude, if you want to, is like rotating dots so that
> they keep the same amplitude (distance from centre). This is usually not
> easy to do, but you already have a components representation using sigmund~,
> so you have the opportunity to fudge the freqs a bit...
>
>  ______________________________**______________________________**
> ___________
> | Mathieu Bouchard ---- tél: +1.514.383.3801 ---- Villeray, Montréal, QC
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