[sdiy] PLL question

[Michael Ruberto]

Hmmmm, phase shift should be a 4 letter word ;-) I guess if the phase shift 
is 180 degrees I'll wind up with alternating 1/8 notes, or more specifically 
16th notes when the 2 machines play together (only the sequencer responds to 
start/stop). maybe it would make sense to derive the 24PPQ from the 12Xclock 
for the sequencer. this will complicate things a bit but in the end I would 
have synchronized machines right?

~M


>From: Tim Ressel <madhun2001 at yahoo.com>
>To: Michael Ruberto <frankentron at hotmail.com>, synth-diy at dropmix.xs4all.nl
>Subject: Re: [sdiy] PLL question
>Date: Mon, 17 Mar 2003 11:51:56 -0800 (PST)
>
>Michael,
>
>There are two issues here. The first is syncing these
>two devices. If they both use a MIDI start command,
>then they will probably be in sync. The second issue
>has to do with phase shift within the PLL. There is no
>guarantee that the 12x clock will be in phase with the
>24PPQ clock. If there is phase shift, then you will
>see a slight delay.
>
>PLLs are pretty easy to make. Whomp one up out of an
>HC4046 and see how it works.
>
>--Tim
>
>--- Michael Ruberto <frankentron at hotmail.com> wrote:
> >
> > I need to take the 24PPQ from a MIDI to DIN Sync
> > converter and speed it up
> > by a factor of 12 with a PLL to clock another device
> > which requires a higher
> > clock rate.
> > Now if I also have a normal sequencer being clocked
> > by the straight 24PPQ
> > will it be in perfect sync with the device whos
> > clock is coming from the
> > PLL? with a constant tempo, will 1/8 notes generated
> > from both machines have
> > acceptable timing to each other assuming the one
> > device will divide down the
> > higher clock rate to generate the 1/8 notes?
> >
> > I apologize for being so vague but I am just in the
> > conceptual phase and
> > haven't put anything to the breadboard yet.
> >
> > I appreciate any input :-)
> >
> > ~M
> >
> >
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