"djbrow54" <davebr@...> wrote:
>
> Tell me more about the timing requiremetns. In looking at
> metronomes, "highly accurate" is described as +/- 1%.
The only "accurate" metronomes were manufactured for the film industry
by UREI - the 900 and 962 Digital Metronomes. They are the metronomes
that every film score was recorded to from post WWII until the advent
of computer generated tempos. These metronomes were designed so that
you could record music on two different days, or at two different
locations and the tempos would be exactly the same. Starting two of
these metronomes together would result in the exact same tempos for
over 10 minutes. They were crystal clocked.
>
> Is this something that MIDI timing clocks could be used for? If
> MIDI could be used as a master clock, it would be easy to build a
> reference timebase. My first MIDI code implemented an interrupt
> routine for input.
I later adopted to the HSERIN command which
> buffers the data. Going back to my original code, I could use real
> time nature of the interrupt to implement a real time clock. I have
> no relevant experience with MIDI clock and synchronization. It would
> be simple to add and implement, though.
A good model about syncronization is to consider syncronizing two
computers that are playing back a recording of an instrument. If
there is a proper lock in syncronization, the two tracks will phase.
Improper syncing results in a phenomena similar to PSIM Madness...
Multiple PSIMs would be
> synchronized to the same MIDI reference. In fact, an AVR2313 with a
> crystal and two resistors could be used to generate such a
> reference. Might be a nifty accessory.
Sounds like an essential accessory!
gary
>
> --- In ComputerVoltageSources@yahoogroups.com, "Gary Chang" > The
> length of Psim Madness is not long in terms of music duration -
> > any typical piece of music is much longer than that. Honestly, a
> high
> > school music student has a better sense of time than the PSIM.
> >
> > INHO, ability to slave the PSIM is essential.
> >
> > If these devices can't play 16 bars together with something else,
> it's
> > pretty much useless as a sequential pitch source.... except for a
> > phasing minimalist piece (such as PSIM madness).
> >
> >
> > gary
>