Embarrassed? I will be! Phase shifting control waveforms.


    Oct 25 2013 | 1:04 pm
    I suspect this is going to be very, very obvious (hence the pre-emptive red face), but I've been unable to figure this out...
    I'm using [function] (with curve turned on) to create curves to control LED lights via DMX.
    There are 4 banks of three lights, mainly using RG&B. I'm going to parallel one light in each bank with the same one in the other banks - ie grouping 1,4,7,10 etc. So I need 4 control waveforms. (I'd be happy to send ramps to each one separately, but I think that'll depend on the method for controlling the phase of the controlling waveforms and how CPU intensive it is).
    So - I can have either a metro/counter or phase~/number~/scale combination stepping through the [function]/ I want to be able to chase the phase of the final output so that eg the reds fade up and down, and the blues start 1/3 of the way thru the cycle.
    So I have to either apply "phase shift" to the float numbers coming out of a single [function], which I suppose I could do with [pipe], or
    use several locked [phasor~]s to drive thru several copies of the [function] (which would allow me to have different curves for each bank of colour) and change the phase of the signal from the phasors. I thought I could do this by sending a float from 0.-1. to the right inlet of phasor~, but it doesn't do anything (at least not with [phasor~ 1n @lock 1])
    I've played with [+~] & [wrap~] & [pong~], but the effect is not actually to just shift the control waveform in time. I thought [delay~] might be the answer, but I can't seem to get it to do anything with the output of a [phasor~] (I guess [delay~] only works with audio rate signals?)
    So that's where I've gotten to. All I want to do is to continuously move control waveforms in and out of phase with each other. Any input?
    thanks!

    • Oct 25 2013 | 5:13 pm
      ok, sorted it. [delay~] was the answer. but for some reason it took a bit of fiddling with it to get it to do what i wanted.
    • Oct 25 2013 | 10:13 pm
      well, delay~ won't really phaseshift anything. It'll just delay it, so you won't be able to, say, go negative phase, for instance, right?
    • Oct 26 2013 | 4:24 pm
      Yes, it's positive only, though I'm still shifting the phase of one LFO wave relative to another aren't I? (OK, maybe not a technically correct use of the language on my part :-) ).
      So is there a way to -ve & +ve phaseshift then?
    • Oct 27 2013 | 3:01 am
      "hence the pre-emptive red face"
      HAHAHAHAAA!!!!
    • Oct 27 2013 | 3:02 am
      "I thought I could do this by sending a float from 0.-1. to the right inlet of phasor~, but it doesn’t do anything (at least not with [phasor~ 1n @lock 1])"
      ya, not with lock.
      if you combine this idea: "or use several locked [phasor~]s"...
      ...with this idea: "I’ve played with [+~] & [wrap~] & [pong~],..."...
      maybe this idea might be more helpful:
    • Oct 29 2013 | 6:24 pm
      @karaokaze
      thanks for that, and yes, that looks like something that'll do what I want. I actually went back to the idea of using sequenced bangs to trigger curve~, and that's working nicely now. However, i'll revisit the original idea in light of your input, so thanks again.
      @raja_tra I must be gerring slow - I didn't notice that one at all. as you say - hahahaha :-)