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Tim Kleinert
Joined: Mar 12, 2004
Posts: 1148
Location: Zürich, Switzerland
Audio files: 7
G2 patch files: 236
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 Posted: Wed Jan 20, 2016 5:46 am Post subject:
Phase Distortion FX
Subject description: (G2 implementation of a Logic plugin) |
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Hi,
I'm no longer officially in the G2 club, but still get occasional PMs with questions etc.. And if it's an interesting subject and doable on the demo software, I'll have a go at it. 
Somebody asked me about this phase distortion insert effect in Logic two days ago, and since it's lacking in our G2 algorithm library and not hard to do, I knocked it together quickly.
Basically the circuit phase-modulates an incoming signal with an (optionally filtered) version of itself, thus creating a wealth of side-bands.
I don't know if the software plugin compensates for the unavoidable latency inherent in the design, but the G2 version unfortunately can't look into the future. 
I made it as a true stereo effect residing in the FX section. Also, to maintain highest audio quality, there are two strategically placed "dummy" delay modules there to override the delay readout bug. (More about this fix here.) They can be deleted of course.
Note: At max "intensity" setting, the waveshaping clips when fed with signals hotter than -/+64 CU. In this case, just raise the MaxRange parameter a little and back the intensity back down until you get the same sonic result (but with a tad more latency).
Patched and tested on the demo software. Hope it works out there in the real world (whatever that means nowadays anyway ).
cheers,
t
| Description: |
| Stereo phase distortion effect circuit; phase-modulates an incoming signal with an (optionally filtered) version of itself, thus creating a wealth of side-bands. |
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Download |
| Filename: |
PhaseDistFX___TK.pch2 |
| Filesize: |
1.67 KB |
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3839 Time(s) |
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W.T.
Joined: Jul 11, 2004
Posts: 272
Location: The Netherlands
Audio files: 1
G2 patch files: 11
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| Posted: Sat Jan 23, 2016 12:24 pm Post subject:
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Thank you very much Tim!
I will try it if I get home soon but I expect it will sounds great 
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Clavia stuff that I use : expanded Nord rack & NM G2 engine. |
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Tim Kleinert
Joined: Mar 12, 2004
Posts: 1148
Location: Zürich, Switzerland
Audio files: 7
G2 patch files: 236
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| Posted: Sat Jan 23, 2016 5:46 pm Post subject:
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| W.T. wrote: | Thank you very much Tim!
I will try it if I get home soon but I expect it will sounds great |
Most welcome. I however have no clue how it sounds on more complex material.  It was a PM request and I just built it in the demo according to my understanding of the plugin description, and then tested it with simple sine waves to make sure it worked right technically. I couldn't/didn't compare it with the original, as I don't use Logic.
Phase distortion of complex waveforms via using a short delay line buffer is a concept I'm familiar with. My additive wavetable complex waveshaping "monster-patch" does exactly that, in different ways (in conjunction with band-limited resampling to avoid inharmonic aliasing). But I never thought of of providing self-phase-modulation as an arbitrary effect, and actually have no clue what it sounds like when applied to more complex program material. |
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Electromagnetic Wave
Joined: Apr 28, 2013
Posts: 298
Location: Kebek
G2 patch files: 38
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| Posted: Sun Jan 24, 2016 1:48 pm Post subject:
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| I don't know this plugin and I don't use Logic but I can confirm that your patch Tim is working good with other stuff than a sine. Very interesting again. Thanks! |
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Blue Hell
Site Admin
Joined: Apr 03, 2004
Posts: 24005
Location: The Netherlands, Enschede
Audio files: 274
G2 patch files: 320
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| Posted: Sun Jan 24, 2016 3:06 pm Post subject:
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I implemented it as well from a description I found, without looking at this patch first (not for the G2 BTW). Funny thing is that I ended up without a pre-delay on the signal going to the filter .. will try that a next time.
It is a really nice effect I must say!
Did add some Envelope and a little random for filter cut-off frequency modulation. And then added a little distortion after.
Anyway, fun idea, and had not seen it anywhere before.
_________________
Jan
also .. could someone please turn down the thermostat a bit.
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Tim Kleinert
Joined: Mar 12, 2004
Posts: 1148
Location: Zürich, Switzerland
Audio files: 7
G2 patch files: 236
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| Posted: Mon Jan 25, 2016 6:34 am Post subject:
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| Blue Hell wrote: | | Funny thing is that I ended up without a pre-delay on the signal going to the filter .. |
The modulator pre-delay offset is half the carrier buffer size. It made sense to do it this way in order to maintain correctly-aligned through-zero phase modulation of the signal with itself. Might well be a bit of "over-engineering" on my behalf.
Another interesting add-on would be feedback of the output to the modulator path.  |
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Blue Hell
Site Admin
Joined: Apr 03, 2004
Posts: 24005
Location: The Netherlands, Enschede
Audio files: 274
G2 patch files: 320
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| Posted: Tue Jan 26, 2016 12:33 pm Post subject:
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| Tim Kleinert wrote: | | It made sense to do it this way in order to maintain correctly-aligned through-zero phase modulation of the signal with itself. |
Yes it made sense to me as well when I saw it, just had not thought about it ... now that I did I think it may be interesting to have that optional
When there is some delay and the ingoing pitch changes it gives a bit of an onset effect on the new tone .. that was with a delay in the 20-30 ms range ... going out of the ' subtle area' a bit anyway.
| Quote: | | Another interesting add-on would be feedback of the output to the modulator path. |
Will try that too!
_________________
Jan
also .. could someone please turn down the thermostat a bit.
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Tim Kleinert
Joined: Mar 12, 2004
Posts: 1148
Location: Zürich, Switzerland
Audio files: 7
G2 patch files: 236
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| Posted: Tue Jan 26, 2016 3:05 pm Post subject:
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| Blue Hell wrote: | | Yes it made sense to me as well when I saw it, just had not thought about it ... |
How do you deal with incoming negative signal amplitudes if you don't have some kind of offset? |
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Blue Hell
Site Admin
Joined: Apr 03, 2004
Posts: 24005
Location: The Netherlands, Enschede
Audio files: 274
G2 patch files: 320
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| Posted: Tue Jan 26, 2016 3:55 pm Post subject:
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by converting the filter out signal from pos/neg to positive only .. level shifting .. which may not work when it resonates but then I attenuate the filter input.
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Jan
also .. could someone please turn down the thermostat a bit.
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W.T.
Joined: Jul 11, 2004
Posts: 272
Location: The Netherlands
Audio files: 1
G2 patch files: 11
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| Posted: Fri Jan 29, 2016 3:52 pm Post subject:
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and yes it sounds great great for experimenting with al kinds of material running trough
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Clavia stuff that I use : expanded Nord rack & NM G2 engine. |
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Tim Kleinert
Joined: Mar 12, 2004
Posts: 1148
Location: Zürich, Switzerland
Audio files: 7
G2 patch files: 236
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| Posted: Sat Jan 30, 2016 3:11 pm Post subject:
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Yesterday I knocked it together in Reaktor for use in our productions (with some extra goodies thrown in ).
And yes, I have to agree, it's a very nice and very useful processing tool, as it adds harmonics without compromising transients. |
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