Hi, thanks for all the ideas and suggestions. I think the amount of possibilities got more and my blind spot got smaller.
I have to sort things out, but first I need to start some tests to get real numbers. I will measure latencies and will check synchronicity (if there is any). In addition I will have to define some realtime constraints. Fons, you wrote, that the delay should be within 0.5ms. Is this a good value to stay away from the Haas effect? Maybe within 0.5ms precedence the localisation is going to "smear"? Does anybody know anything about it or is it a naive idea? Thanks, Sven Thebert On Mon, Jan 28, 2013 at 3:23 PM, Fons Adriaensen <[email protected]> wrote: > On Mon, Jan 28, 2013 at 10:14:48AM +0000, Dave Malham wrote: > >> On 28 January 2013 02:53, Ross Bencina <[email protected]> wrote: >> >> > >> > How about deriving word clock from the AC power line? :) >> >> That's probably the simplest solution for something that could use >> local SD card players, though not for real time work. Keep the average >> sample rate over a long period of time synced to the AC frequency >> (doesn't matter if there is some drift due to distribution grid >> loading, as all units should see this the same) and start time >> controlled by a simple RF remote control system. They'll all stay in >> sync and so long as the inter-unit delays are minimal (see Fons' >> earlier email) it'll be fine for pretty well anything except perhaps >> wfs > > Syncing to the power line would require relatively simple electronics > (a simple very low BW PLL) and do the job nicely. If the sound card > has software clock offset controls almost no extra HW would be required. > > The remove any remaining constant delay differences a simple solution > would be to measure them, e.g. using a short linear sweep, and then > send a correction to each unit. This could be entirely automated. > Once done, all units would stay in perfect sync as long as they have > power. > > Ciao, > > > -- > FA > > A world of exhaustive, reliable metadata would be an utopia. > It's also a pipe-dream, founded on self-delusion, nerd hubris > and hysterically inflated market opportunities. (Cory Doctorow) > > _______________________________________________ > Sursound mailing list > [email protected] > https://mail.music.vt.edu/mailman/listinfo/sursound _______________________________________________ Sursound mailing list [email protected] https://mail.music.vt.edu/mailman/listinfo/sursound
