29 Aug
2007
29 Aug
'07
8:38 p.m.
On Wed, Aug 29, 2007 at 11:19:55PM +0100, Folderol wrote:
I did some work on PLLs at RF mmmfty mmmf years ago
and seem to remember
that they are only really effective if there is a large difference
between the controlled signal and the rate of change, which I wouldn't
have thought would be true in this case.
It's not clear what exactly you mean, but anyway a the working of
a PLL does not depend on 'large differences' - it can track even
the most subtle changes.
This actually, isn't really what I'm after
anyway. I want to do what is
potentially much simpler, I want to manage a completed MIDI recording
rather than working on-the-fly.
For a software PLL it doesn't matter if it operates real-time or on
stored data. But the latter makes it possible to use more advanced
systems, using things like open-loop algorithms (which can very suble
changes and work in non-linear ways without the risk of instability),
or backtracking - reviewing previous decisions in the light of new
information.
But whatever approach you use, if it is capable of tracking tempo
changes it will be a form of PLL, but maybe in disguise.
--
FA
Follie! Follie! Delirio vano รจ questo !