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 Forum index » Clavia Nord Modular » G2 Building Blocks
Differentiator / Z-1 Delay Generator
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Tim Kleinert



Joined: Mar 12, 2004
Posts: 1141
Location: Zürich, Switzerland
Audio files: 7
G2 patch files: 236

PostPosted: Wed Aug 26, 2015 6:23 pm    Post subject: Differentiator / Z-1 Delay Generator
Subject description: super-economic building block (2 mixers)
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As mentioned in previous posts, I'm going through my G2 folders and publishing anything I ever came up with that might be useful.

This super-cheap building block produces both per-sample differentiation of an incoming signal (=detection/output of instantaneous change) as well as an one-sample delay of the signal (z-1).

It neatly exploits the way the G2 patch compiler prioritizes things, and thus only requires only 2 mixer modules. Therefore however, the module placement is absolutely crucial! (If you place the lower module above the upper, everything stops working.)

The demo shows both differentiation (turning a triangle osc into a square) and z-1 delay (via nulling with an 1-sample audio delay line). It's all audio-rate obviously. If you need control rate, you'll have to break the feedback loop and reconnect it so the patch re-compiles accordingly.

Cheap and useful for low-level filter designs that require z-1 stages (eg. biquads), instantaneous detection of value changes etc...

cheers,
t


CheapDiff Z-1_TK.pch2
 Description:
z-1 differentiation and z-1 delay in one super-cheap building block (only two mixer modules).

Download
 Filename:  CheapDiff Z-1_TK.pch2
 Filesize:  1.42 KB
 Downloaded:  821 Time(s)

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BobTheDog



Joined: Feb 28, 2005
Posts: 4004
Location: England
Audio files: 32
G2 patch files: 15

PostPosted: Sun Aug 30, 2015 12:29 pm    Post subject: Reply with quote  Mark this post and the followings unread

Good stuff, keep em coming Smile
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Electromagnetic Wave



Joined: Apr 28, 2013
Posts: 208
Location: Kebek
G2 patch files: 30

PostPosted: Mon Aug 31, 2015 1:29 pm    Post subject: Reply with quote  Mark this post and the followings unread

Wow! This is a nice hack ! I never thought of using the way the G2 patch compiler prioritizes things as an audio rate / control rate.

Thanks!

Smile
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Tim Kleinert



Joined: Mar 12, 2004
Posts: 1141
Location: Zürich, Switzerland
Audio files: 7
G2 patch files: 236

PostPosted: Mon Aug 31, 2015 3:56 pm    Post subject: Reply with quote  Mark this post and the followings unread

Electromagnetic Wave wrote:
Wow! This is a nice hack ! I never thought of using the way the G2 patch compiler prioritizes things as an audio rate / control rate.

Excuse me, but I think you misunderstood me. Smile I was referring to the way the compiler prioritizes the calculation order of modules. This cheap 2-module circuit only works as long as the lower module stays were it is. If you move it above the upper, the design doesn't work anymore.

The audio-/control-rate reference was only made because you have to break the feedback loop and re-patch it in order for the circuit to re-compile to control-rate, if that's the type of signal you're inputting and want to process at that rate.

Of course, you can also differentiate control-rate signals at audio-rate. The phase-accumulator/trivial-sawtooth DIY oscillator core building block I just posted does exactly this, in order to turn a control-rate sawtooth LFO into a trivial audio-rate one via linear inter-/extrapolation, in order to exploit the accurate tuning properties of LFO modules.

cheers,
t
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Electromagnetic Wave



Joined: Apr 28, 2013
Posts: 208
Location: Kebek
G2 patch files: 30

PostPosted: Tue Sep 01, 2015 10:36 am    Post subject: Reply with quote  Mark this post and the followings unread

What I understud is that you can affect the sound with the way the compiler prioritizes the calculation order of modules. This is new to me ...

Quote:
If you move it above the upper, the design doesn't work anymore.

Yes I tried this. No more sound when I move it... the design doesn't work anymore as you said.

I miss something ?

Quote:

The phase-accumulator/trivial-sawtooth DIY oscillator core building block I just posted does exactly this, in order to turn a control-rate sawtooth LFO into a trivial audio-rate one via linear inter-/extrapolation


Yes. I have an eye on this nice patch

Smile
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