[PD] a sort of a tempo tracker [pd challenge]

[peiman khosravi]

Hello,

Thanks very much for your replies.

But my problem is not so much the tempo detection itself but the generation
of a signal that compensates for the difference in speed, so there is
feedback loop built into the system in order to ensure that two
simultaneously playing tracks are kept in phase. I can detect the tempo by
taking a moving average, but the rest I haven't figured out. I've attached
a diagram of the desired algorithm. Note that inputs A and B must remain in
phase, which is the hard bit. How to generate a speed variable that also
ensure the two tracks remain more or less in phase and don't drift?

Thanks
Peiman

[image: Inline images 2]








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On 22 May 2014 16:51, Rama Gottfried <rama.gottfried at gmail.com> wrote:

> Oh cool! Hi David!
>
> that sounds interesting, will check it out.
>
> Looks like his lab has some recent papers on pulse detection as well:
>
> http://www.ccs.fau.edu/~large/Music_Dynamics_Lab/Publications/Publications.html
>
> with cheers,
> Rama
>
>
>
> On May 22, 2014, at 12:17 AM, David Medine <dmedine at ucsd.edu> wrote:
>
>  Hey, Rama!
>
> I just saw a very impressive thing by Ed Large (a neuro-science guy from
> UCONN). He models neuron oscillations with coupled nonlinear equations and
> with this he gets really nice spikes at the pulse tempo even with signals
> that don't have any onsets on the beat.
>
> He said the model will be available in a month or so and the paper is
> still under review. The other thing is that there is a training layer (also
> neuro-model motivated) that you have to warm the thing up with, but my
> impression is that you only have to do this once and then it is ready to
> go. It's worth keeping an eye on for beat tracking solutions.
>
>
> On 05/20/2014 07:32 PM, Rama Gottfried wrote:
>
> Hi Peiman,
>
>  maybe check out antescofo~, there’s a pd version here:
> http://forumnet.ircam.fr/shop/en/forumnet/44-antescofo.html
>
>  I’m sure there are ways to patch this as well, but antescofo~ makes use
> of some nice HMM tricks to anticipate when you’re going to play next.
>
>  best,
> Rama
>
>
>
>  On May 20, 2014, at 12:36 PM, peiman khosravi <peimankhosravi at gmail.com>
> wrote:
>
>  Hello everyone,
>
>  I am in serious need of advice! Here is what I need:
>
>  I need to compare a click-track with the input from a live midi sequence
> (played on a midi drum pad) and slow down or speed up the click track to
> match the tempo of the live midi input. So I need to generate a speed
> factor that will change dynamically to keep the click track in sync with
> the live sequence. The problem is that the two need to stay in phase so a
> simple tempo follower won't work.
>
>  It's more complex that I'd initially though it would be. Any
> suggestions?
>
>  Many thanks in advance
>  Peiman
>
>
>
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