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 Forum index » Clavia Nord Modular » G2 Building Blocks
Pseudo Stereo
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Tim Kleinert



Joined: Mar 12, 2004
Posts: 1038
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PostPosted: Wed Nov 02, 2005 3:29 am    Post subject:  Pseudo Stereo Reply with quote  Mark this post and the followings unread

Some things are so obvious they go unnoticed... like this simple allpass filter application. So I thought I'd post it here.

Of course, it ain't mono-compatible. Mixing L and R together results in the frequencies being 6dB-lowpass filtered at the cutoff frequency. But still, it's an cheap usable technique, nice if you're working eg. on the stereo imaging of a a complex mix.

cheers,
tim


PseudoStereo TK.pch2
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Stupidly obvious but oh well...

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mosc
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Joined: Jan 31, 2003
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PostPosted: Wed Nov 02, 2005 5:28 am    Post subject: Reply with quote  Mark this post and the followings unread

This is very interesting. I've been using two phase shifters to get pseudo stereo, but this is a lot cheaper... more subtile though... but sometimes that's better.
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Tim Kleinert



Joined: Mar 12, 2004
Posts: 1038
Location: Zürich, Switzerland
Audio files: 6
G2 patch files: 213

PostPosted: Wed Nov 02, 2005 12:14 pm    Post subject: Reply with quote  Mark this post and the followings unread

Well, Howard, the allpass filter is actually phase shifter.Wink

What I like about this is that the allpass filter frequency determines the position in the spectrum from where on upwards things start to become 'wide', due to frequencies being increasingly shifted to their respective antiphase above the cutoff.

This is nice because it leaves the low and lower components mono, which is better anyway.

I like to use it on high-freq percussion (shakers, cymbals), in order to push them to the sides of the stereo image while kick and snare are more in the middle.

As I say, it's so simple...

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cebec



Joined: Apr 19, 2004
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PostPosted: Wed Nov 02, 2005 12:45 pm    Post subject: Reply with quote  Mark this post and the followings unread

I wish I knew what the hell was going on in that red block!

Rob's G2 workshops go over some of this stuff but my understanding is still rather basic.

I'm wondering if there're other resources for learning how to use the G2's Level and Mixer modules to perform computations and create DIY sub-patches like many of those you, ik, and Rob have shared.
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Tim Kleinert



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PostPosted: Wed Nov 02, 2005 1:06 pm    Post subject: Reply with quote  Mark this post and the followings unread

cebec wrote:
I wish I knew what the hell was going on in that red block!


It's just an allpass filter, gradually shifting the (mono) signal into antiphase above the cutoff, to perform a pseudo stereo effect when panning the shifted signal hard left and the original one hard right (or vice versa).

Here's what's going on: if you subtract a 6dB LP-filtered signal from the original, you get the remaining HP component (first mixer module) And if you then subtract that from the LP-filtered signal (second mixer module), all frequencies will be present again, but the HP component will be in antiphase. Voilà the allpass filter.
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dasz



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PostPosted: Thu Nov 03, 2005 3:19 pm    Post subject: Reply with quote  Mark this post and the followings unread

Nice one, tim.
/Dasz

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