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PLL in Max or Pd
 
 
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Author PLL in Max or Pd
arthurgrimley
Learning to Wiggle


Joined: 06 Mar 2011
Last Visit: 27 Feb 2014

Posts: 12

PostPosted: Thu Feb 23, 2012 12:18 pm    Post subject: PLL in Max or Pd Reply with quote Add User to Ignore List

Hi everyone,

I'm interested in creating a Phase Locked Loop (PLL) in MaxMSP or Pd - this kind of thing

http://www.muffwiggler.com/forum/viewtopic.php?t=53142&highlight=pll

but while I can get close to the sound with [rampsmooth] or [line], can anyone offer advice as to how I could implement something like an actual PLL mechanism (running at audio rates)? A search of the Max and Pd forums doesn't seem to turn up much useful.

Thanks
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CJ Miller
Super Deluxe Wiggler


Joined: 28 Apr 2011
Last Visit: 24 Apr 2014

Posts: 3690
Location: Mumfordshire

PostPosted: Thu Feb 23, 2012 1:19 pm    Post subject: Reply with quote Add User to Ignore List

I'd never really thought about it before. I guess I'd try looking at patches for pitch-tracking input, and repurpose them for internal signals. If you can play with the tracking parameters it might function in a similar way to a PLL.
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felix le chat
Veteran Wiggler


Joined: 10 Aug 2010
Last Visit: 18 Feb 2013

Posts: 606

PostPosted: Fri Feb 24, 2012 4:34 am    Post subject: Re: PLL in Max or Pd Reply with quote Add User to Ignore List

arthurgrimley wrote:

but while I can get close to the sound with [rampsmooth] or [line], can anyone offer advice as to how I could implement something like an actual PLL mechanism (running at audio rates)?

As far as I remember, the Doepfer PLL manual explains how the components are connected. It should be possible to do this in software, at audio rate.

The difficult part is you cannot make zero-latency feedback paths in software. But maybe you can simply add a single sample delay line in each feedback loop and it will sound similar.

Cheers
Flc
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skrasms
Common Wiggler


Joined: 07 Nov 2008
Last Visit: 12 Apr 2014

Posts: 193

PostPosted: Mon Mar 05, 2012 1:18 am    Post subject: Reply with quote Add User to Ignore List

This thread motivated me to make a PLL with the gen~ object in Max 6. I posted the results on the Cycling74 forum here:
http://cycling74.com/forums/topic.php?id=38452
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