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 Forum index » Clavia Nord Modular » G2 Patches - Experimental
Another oscillator pseudo-hardsync approach
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Tim Kleinert



Joined: Mar 12, 2004
Posts: 1040
Location: Zürich, Switzerland
Audio files: 6
G2 patch files: 213

PostPosted: Wed Apr 07, 2010 8:05 pm    Post subject: Another oscillator pseudo-hardsync approach Reply with quote  Mark this post and the followings unread

Since normal oscillator hardsync aliases deep down into the audio spectrum, really ugly, I've been trying some alternatives to get somewhat the same sound but with better quality.

Here's a trick that uses phase modulation by a sawtooth wave at the same frequency. Mathematically, PM is the differential of FM, which means that one can do PM via the carrier FM inputs by running the modulator through a highpass filter first.

Rather than modulating the FM index for the "sync sweep" sound, I modulate the frequency of this highpass filter from full 21kHz downwards. I think this sounds better.

This approach also has it's issues. Since the PM isn't 100% precise, the carrier oscillator phase will slowly drift. Depending on application, this isn't a big deal. When involved in heavy "sync sweeping" this is all but unnoticable. Also, this approach does have aliasing issues too. But I find them a bit less objectionable.

cheers,
t


PseudoHardSyncTK.pch2
 Description:
Pseudo oscillator hardsync via sawtooth phase modulation.

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 Filename:  PseudoHardSyncTK.pch2
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