On 11/01/2014 08:10 PM, Clemens Ladisch wrote:

hermann meyer wrote:

I try to fetch the bpm from the Midi Clock, and stumble over "jitter".

How do you usually fetch the bpm from Midi Clock, any pointer will be welcome.

<http://en.wikipedia.org/wiki/Phase-locked_loop>
<http://en.wikipedia.org/wiki/Kalman_filter>

MIDI clock is interesting, because deviations from the predicted clock
frequency are either errors and must be suppressed, or are because of
a change in tempo and must replace the old clock rate.

A very good paper with example code:
 http://kokkinizita.linuxaudio.org/papers/usingdll.pdf
(ardour uses that approach to filter MTC, LTC and MClk)

ciao,
robin
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