sfraser Wrote: > Not sure I believe them either . IMO, if you design a external DAC with > X amount of buffer space, you should be able to eliminate all external > jitter (jitter being time variances between data samples arrival at the > DAC input). Now once that sample is buffered you should be able to > stream it internally to the DAC, if it is designed correctly, a very > controlled environment therefore not introducing any new jitter (or > very little). In my mind a simple buffer eliminates all external jitter > and any problems it may cause. > > Regarding over/under flow of buffer space. I'm not sure that i follow. > Assuming the SB2 is the source it's providing the clocking for the data > arrival to the DAC device buffer . Even if it was clocking at bit fast, > a 64 M buffer will more than handle it in all residential applications. > 64 M of RAM purchased in bulk commercially can't run you more than a > few bucks. Less than the gold leaf writing on the front of the DAC > device (but thats marketing a real black art) .However as I stated > earlier, maybe I don't comepletly understand the problem.
There were a couple of recent threads about the idea of drift over time when clocks don't match: http://forums.slimdevices.com/showthread.php?t=3697&highlight=forever+drift http://forums.slimdevices.com/showthread.php?t=17948&highlight=drift You may be right in that it may take a very long time to run out of buffer with small clock differences (and this may be far smaller than album length, giving a chance to resync periodically). But this sounds kludgy, and from a purist standpoint, if the DAC drifts from the source, the display of time, etc. on the source unit will be further and further away in time from what you are hearing. Another issue is that you'd want to full the buffer to the 1/2 way point when you start the music, so this would cause a delay proportional to the buffer size. I think that if there is a way to keep from accumulating drift and still get good results, it's preferable not to use the large buffer/two clock method. -- LavaJoe ------------------------------------------------------------------------ LavaJoe's Profile: http://forums.slimdevices.com/member.php?userid=2331 View this thread: http://forums.slimdevices.com/showthread.php?t=18772 _______________________________________________ audiophiles mailing list [email protected] http://lists.slimdevices.com/lists/listinfo/audiophiles
