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 Forum index » Clavia Nord Modular » G2 Building Blocks
Anti-aliased DIY Oscillators
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Tim Kleinert



Joined: Mar 12, 2004
Posts: 1027
Location: Zürich, Switzerland
Audio files: 6
G2 patch files: 212

PostPosted: Thu Jan 06, 2011 2:21 am    Post subject: Anti-aliased DIY Oscillators
Subject description: implementing the DPW technique
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This patch generates a smooth sawtooth wave via the DPW (differentiated parabolic waveform) method.

Anti-aliased DIY oscillators, at last. Smile

Unfortunately the expo tracking precision problem remains due to the inaccuracy of the LevelScaler module. But at least now there is no tracking resolution problem anymore, as this design uses true modulo counters without generating jitter.

cheers,
t

UPDATE: expanded version offering variable width pulse wave added.


DPW-AA-SawOsc_TK.pch2
 Description:
DIY sawtooth oscillator with DPW anti-aliasing

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 Filename:  DPW-AA-SawOsc_TK.pch2
 Filesize:  1.65 KB
 Downloaded:  513 Time(s)


DPW-AA-SawPulsTK.pch2
 Description:
Expanded DIY oscillator with DPW anti-aliasing, offering saw and pulse wave

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 Filename:  DPW-AA-SawPulsTK.pch2
 Filesize:  2.16 KB
 Downloaded:  540 Time(s)

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dorremifasol



Joined: Sep 28, 2006
Posts: 775
Location: Barcelona, Spain
Audio files: 7
G2 patch files: 47

PostPosted: Mon Jan 10, 2011 2:37 am    Post subject: Reply with quote  Mark this post and the followings unread

Tim, this is very impressive! Thank you for sharing such great patches.

I can't wait for a version using user definable waveforms Smile

_________________
Cheers,
Albert
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WhitePony64



Joined: Oct 23, 2010
Posts: 5
Location: Auckland, New Zealand

PostPosted: Sat Mar 05, 2011 5:01 pm    Post subject: Reply with quote  Mark this post and the followings unread

Hi all,

I'm just trying to get my head around all the timbre changing patch components I've been looking at lately.

Would I be correct in saying that these antialiasing oscillators are designed to reduce the disadvantages of using a a digital system with a fixed sample rate, as opposed to one with an infinite analogue spectrum?

Would I also be correct if I said that the purpose of these antialiasing oscillators is different from Rob's Tilt Filter and that to get the warmest/most analogue sound out of a patch I should use both together?

Sorry, I'm just trying to understand it all!

Thanks.
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Tim Kleinert



Joined: Mar 12, 2004
Posts: 1027
Location: Zürich, Switzerland
Audio files: 6
G2 patch files: 212

PostPosted: Sun Mar 06, 2011 9:58 am    Post subject: Reply with quote  Mark this post and the followings unread

All stock G2 oscillator modules are already sufficiently anti-aliased. The aliasing problem occurs when rolling your own. This patch shows how to suppress aliasing on a primitive counter circuit DIY sawtooth oscillator using the DPW technique.
It's just an experimental patch that probably isn't of much use to anyone Laughing, but shows that DIY anti-aliasing of some sorts can be done. I like to dabble around with this kind of seemingly useless Laughing"low level" stuff, as sometimes you occasionally really do find a real practical use for it later on.
If you are looking for techniques to beef up the G2 sound, check out my "oscillator warmth" circuit. It's sort of a "tilt filter for oscillators".
arrow http://www.electro-music.com/forum/topic-34508.html
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WhitePony64



Joined: Oct 23, 2010
Posts: 5
Location: Auckland, New Zealand

PostPosted: Sun Mar 06, 2011 2:52 pm    Post subject: Reply with quote  Mark this post and the followings unread

Ohh, I see. Cool, thanks for the reply!
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