tls Wrote: > It can't possibly have anything to do with "power line conditions" since > the power input to the Squeezebox is DC, not AC. "Power line > conditions" impacting time sync is -- and I do know a little bit about > this, since one thing I used to do for a living was design digital > carrier circuits for a telco -- something that went the way of the > dinosaur with the General Electric 60Hz electromechanical alarm clock > many of us had by our bedsides as kids. ;-) > > I'm more than a little surprised that the units can't keep tight sync > over the course of a song. They have an accurate oscillator of more > than sufficient frequency available to drive the digital output -- if > they didn't, it would have fierce bit sync problems, bad enough to be > audible as glitches. Perhaps the digital output IC they use doesn't > expose this clock to the rest of the system, or perhaps the rest of the > hardware design doesn't allow its use to keep frames in sync during > playback. > > Temperature variations would make sense except that my two units are in > adjacent rooms. Basically, I have to ask "just how crappy are the > system clocks on these devices, anyway?" since you'd need a *really* > bad oscillator to slip by half a second over the course of a few > minutes, which is what I'm seeing.
Ah, good point about the power-line stuff. I'm not an electrical engineer so I really am not able to comment any more about this intelligently. I agree that the slippage seems surprising. It'd be interesting to hear from Sean on the matter. Here's a crazy thought--are you running different VU effects on the two units? I wonder if the processor load could have anything to do with it? I don't have any idea how these things are designed or programmed at a low level, so someone more knowledgable than I might come along and be able to definitively say that there's no way for the processor load to affect the audio data being output. But as a lay observer it seems like a potentially plausible explanation. -- azinck3 ------------------------------------------------------------------------ azinck3's Profile: http://forums.slimdevices.com/member.php?userid=3967 View this thread: http://forums.slimdevices.com/showthread.php?t=24380 _______________________________________________ discuss mailing list [email protected] http://lists.slimdevices.com/lists/listinfo/discuss
