does anyone know if there is an abstraction or external for a barber-pole type LFO - sometimes also referred to as 'infinite' or 'through zero' LFO?

I see the Shepard Tone generator example in the Pd patches folder but just wanted something I didn't have to hack...

thanks in advance
kc

wow! thanks so much for doing this...yes I'm trying to implement a through zero phaser which is also called (erroneously) the barberpole phaser. As I understand it the same basic idea used in the Shepard Tone generator can be applied to both pitch and phase parameters. As DSP has never been my core competency I was trying to work out how I'd approach hacking the Pd example for generating Shepard Tone to shift phase.
My thinking was if I were to ramp several allpass filters and fade in/out their outputs at 120degree phases this might do the trick. But I hadn't gotten that far.
Essentially I'm trying to replicate a soundfile I DL'd which has a triplet of sines being continuously phased past a dry version of itself.
Again I thank you for your help - and I'll take a look at your patch! I'm sure I'll have some questions about it

love the infinite flanger!

@Maelstorm said:

I've actually never heard of this, but based on the description here, it shouldn't be difficult:

http://yusynth.net/Modular/EN/QUAD-LFO/index.html

You could just do it with just a few objects (going with some Max-style segmented patch cords here):

[phasor~]
|
|______________________
| | | |
| [+~ .25] [+~ .5] [+~ .75]
| | | |
| [wrap~] [wrap~] [wrap~]
| | | |
[cos~] [cos~] [cos~] [cos~]

Hello,

I tried doing cuadrature in other form:

[osc~]
| [r~ 1] [r~ 2]
| | |
[hilbert~] [hilbert~] [hilbert~]
| | | |
| [s~ 1] [*~ -1] |
| | [s~ 2] |
[outlet~][outlet~] [outlet~] [outlet~]

But in my patch something dont works, because if every outlet is conected to dac~ objet, there are not total silence.
I see in my patch that the output 1 is not canceled with output 3 and the same with the outputs 2 and 4.
I wish know another way of doing cuadrature...

Thanks!

http://www.pdpatchrepo.info/hurleur/cuadrature.pd

[hilbert~] doesn't simply pass the input and give a second signal that is phase-shifted by 90 degrees. It sends the input to two all-pass filters that results in two signals that are 90 degrees out-of-phase with each other. So BOTH output signals are phase-shifted versions of the input. It's not really meant for this sort of thing. You'd be better off using the version I gave, if possible. It would also be less CPU intensive.

Thanks, what a mistake!

the reason because I am trying another way of doing cuadrature is due to I am trying to do a cuadrature lfo with the waveforms of saw, triangle, square and sine.
if is possible it seems to me very interesting such tipe of lfo

bye!

It's possible. Just replace the [cos~] objects with the shapes you want.

Thanks Maelstorm,

Has been easier than I thought at first.
Finally, the quadrature oscillator very easy to use and functional with 4 different waveforms.

Goodbye!

http://www.pdpatchrepo.info/hurleur/Complex_Cuadrature-LFO.tgz

Thanks Maelstorm,

Has been easier than I thought at first.
Finally, the quadrature oscillator very easy to use and functional with 4 different waveforms.

Goodbye!

http://www.pdpatchrepo.info/hurleur/Complex_Cuadrature-LFO.tgz

This thread is very cool!

@complex
What does the vol~ external do in your patch? Also from which library is it from? Best Regards

@tungee I cannot be certain but given the age of the op it is probably this abstraction......... vol.zip (from the creb lib in extended).
David.

Thank you whale! Nice to see its a abstraction than an external