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MMD > Archives > November 1998 > 1998.11.26 > 06Prev  Next


Phase Locked Loop in Music Roll Processes
By Albert de Boer

Hi --  Before I get all engrossed in turkey I have this nagging question
that I would like to get an answer to from someone who knows.  What does
Wayne Stahnke mean when he employed the "phase locked loop" concept in
transcribing rolls in order to correctly recreate a master roll using
what he called, in an article he wrote in 1996, the "intended" step.

I think I know what it is he did (ref. the Telarc CD), but where does
the "phase locked loop" get into the picture, and what does it do?
Maybe if he reads this request he could enlighten all of us that would
like to know and have been afraid to ask...  I expect that I am not the
only one that does not know, but I could be wrong.

Albert De Boer

 [ That's a good question, Albert, and the concept is tough to explain.
 [ Ampico used a phase locked loop to synchronize the sprocket holes
 [ in the master roll to an imaginary gear, so that actual pins weren't
 [ needed to move the master roll across the perforators reader head
 [ (the tracker bar).  I'll ruminate on it today after I eat the big
 [ turkey dinner, and meantime maybe our readers can help you.
 [ -- Robbie


(Message sent Thu 26 Nov 1998, 05:07:53 GMT, from time zone GMT-1000.)

Key Words in Subject:  Locked, Loop, Music, Phase, Processes, Roll

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