[sdiy] PLL question

[Tim Ressel]

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
> 
>
_________________________________________________________________
> The new MSN 8: advanced junk mail protection and 2
> months FREE*  
> http://join.msn.com/?page=features/junkmail
> 


__________________________________________________
Do you Yahoo!?
Yahoo! Platinum - Watch CBS' NCAA March Madness, live on your desktop!
http://platinum.yahoo.com