Midi Merge Technique? (Jitter)

[Batz Goodfortune]

Y-ellow Y'all.
	it just occurred
At 02:43 AM 01/23/00 +0100, Magnus Danielson wrote:

[bobbit]

>MIDI clocks are just specified as being relative in frequency and not much is
>being said about jitter. Nobody really thinks about jitter since it is an
>asynchronious protocol which by nature has varying delay. Jitter is the
>property of some cyclicly reoccuring event, and this is exactly what an
>asynchronious protocol isn't. If you try to send contious events over it you
>may talk about jitter thougth. You could also possibly talk about jittered
>delay as you send some message in and await it to pass through some system.
>There is the cyclic event in your messurement and not in the system.

There is one thing that all of us have overlooked as far as jitter is
concerned. Including myself until now. And that is, the receiving end, if
it's any good, has to have a PLL or fly-wheel circuit. Whether that be
software or hardware. And what this does is overcome Jitter.

Often called a flywheel circuit because of it's similarities to a big heavy
flywheel with a lot of momentum. It takes a lot to change the speed over a
long time. Which means the speed is pretty damn constant at the receiving
end. regardless of how much jitter there is. (to a point of course)

And of course. The reaction time of the PLL is set up so that a fast rate
of change (accellarando/decellarando) can occur but jitter and even missing
pulses can be circumvented.

So I guess, as long as the jitter isn't so bad that it represents an actual
tempo change, there isn't going to be much of a problem.

Hope this helps.

be absolutely Icebox.

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