[PD] phasor~ and osc~ right inlet: exact timing (was: phasor~ and osc~ right inlet: signal?)

Frank Barknecht fbar at footils.org
Fri Apr 16 20:19:09 CEST 2010

On Fri, Apr 16, 2010 at 01:37:37PM +0200, Roman Haefeli wrote:
> To sum it up, in most cases exact timing can be achieved, but the exact
> timing for the phase reset is _really_ missing (and is actually
> essential).

Well, Mike's version for a clock-accurate phasor~ clone actually is
pretty good and indeed working. And it's very simple and elegant as well.

You start with making a phaseshifted phasor~ by sending the phasor~ through a
[wrap~] as is used a lot in Miller's book and the docs when building synced
phasor signals for granular synthesis or windowed sample playing. 

If you add some value to the phasor~ signal, the wrap~-phasor will just
be phaseshifted by that value. So adding 0.5 to the phasor~ will give
you a phasor~ in the end that is 0.5 out of phase from the original.

Mike's trick then is to take a snapshot~ of the original phasor at the
moment of the desired phase resetting.  If you substract that value from
the original phasor, you get a phasor~ shifted up or down just by the
value it had when the phase was last reset.

Now you can add in the desired phase value again to get a wrap-phasor that is
out of sync to the original phasor in exactly the desired fashion.


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