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 Forum index » Clavia Nord Modular » G2 Building Blocks
N input/shuffle(permutation)/N output
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Falk



Joined: Mar 07, 2006
Posts: 75
Location: Sweden
G2 patch files: 29

PostPosted: Sat Jun 16, 2007 5:58 am    Post subject: N input/shuffle(permutation)/N output Reply with quote  Mark this post and the followings unread

Hello.

A question on the G2 FAQ forum by audible about how to randomly route N inputs to N outputs eventually led to this binary switching network patch.

Patch contains a 2 in/2 out, 4 in/4 out and a 8 in/8 out building blocks.
16 in/16 out is too large to fit in the G2 (would require 100.8% memory).

Pro: Easy to understand
Con: Can only be power of 2 in size (i.e. no 3 in/3 out, 7 in/7 out etc)
Con: Uses a lot more CPU if used to route audio rate signals

Enjoy
/Falk


ShuffleN.pch2
 Description:
Randomly routing N inputs to N outputs

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 Filename:  ShuffleN.pch2
 Filesize:  5.68 KB
 Downloaded:  664 Time(s)

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Falk



Joined: Mar 07, 2006
Posts: 75
Location: Sweden
G2 patch files: 29

PostPosted: Sat Jun 16, 2007 6:53 am    Post subject: A second take on the problem Reply with quote  Mark this post and the followings unread

Hello.

After my first approach I thought I could do better (i.e. cheaper). 3 days of hard patching later ....

This is based on the idea of shifting the values 0, 4, 8, 12, 16, 20 and 28 around a circular shift register and for every shift operation randomly swap elements at position 1 and 2. The shift register is sampled and used to drive a bunch of Mux8-1 to get a new permutation.

Pro: Cheaper at 20.0% CPU and 30.5% memory for 8 in/8 out
Pro: No increase in CPU for audio rate signal routing
Pro: Can be modified to work from 2 in/2 out up to 7 in/7 out
Con: Bloody hard to understand
Con: Needs to be triggered to get a random permutation, initially input 1 is routed to all outputs
Con: Can not easily be expanded to be larger then 8 in/8 out

Enjoy
/Falk


ShuffleN_v2.pch2
 Description:
Another take on the N in/N out permutation

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 Filename:  ShuffleN_v2.pch2
 Filesize:  3.99 KB
 Downloaded:  603 Time(s)

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Falk



Joined: Mar 07, 2006
Posts: 75
Location: Sweden
G2 patch files: 29

PostPosted: Sun Jun 17, 2007 3:40 am    Post subject: OK, I lied......
Subject description: 15 in/15 out shuffle
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Hello all.

Same approach as previous patch but expanded to 15 in/15 out

At 66.4% CPU and 95.4% memory I really can't see how you'd get the modulation sources in, or the modulation targets.

You can however easily modify this patch to do 14/14, 13/13 etc
You can also do 15 in/14 out all the way down to 15 in/1 out.

Descriptions of how to do that is in the textpad.

I think I have earned myself a beer but the fridge is all empty Sad

/Falk


ShuffleN_v3.pch2
 Description:
Expanded to 15 in/15 out

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 Filename:  ShuffleN_v3.pch2
 Filesize:  6.26 KB
 Downloaded:  583 Time(s)

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