15 Dec
2002
15 Dec
'02
8:34 a.m.
synchronizing
position with a VCR via SMPTE (for example) has
nothing to do with sample clock sync. likewise, a word clock
connection between two digital devices has nothing to positional
synchronization.
Good point. One could say that every sync source generates one of
these:
* timing data (tempo, sample clock,...)
* positional data (song position, SMPTE,...) Positional data sort of implies that you can extract
timing data as
well, provided you get a stream of positional data with sufficiently
accurate timing.
no, you can't. how rapidly we are moving through a series of events on a
timeline has nothing to do with how many samples per second we expect
to process. we could be playing something at half-speed, for example,
or scrubbing using an MTC/MMC/SMPTE power jog wheel.
Anyway, in that other post, I think I said there *is* a
relation
between all of these, but I forgot to explain why:
* Audio device syncs to wordclock
* Sequencer uses audio for timing (nominal sample rate assumed)
Note that both are just *sync* - not lock. If you wanted to sync with
a VRC, you would most probably be using SMPTE instead of wordclock -
and then, it would make a *lot* more sense to sync + lock the
sequencer to that, and just let the audio interface do 48 kHz, or
whatever you like.
see above. you're confusing two entirely separate types of synchronization.
so, slaving to
a positional reference has no effect on sample
rate.
Well, it *could*, if you assumu that one SMPTE frame corresponds to N
samples... ;-)