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@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.h...
with cheers, Rama
On May 22, 2014, at 12:17 AM, David Medine dmedine@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@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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