JohnSwenson;511381 Wrote: > There is no way out of the box to apply an external clock sync to the > touch, you have to apply some form of surgery. > > The easiest way is to replace one or both of the "audio" crystals with > a clock from the outside world. The touch has two crystals: 22.5792 MHz > for 44.1 and 88.2 and 24.576 MHz for 48 and 96. > > You need a clock source that supplies these frequencies (if you build > your own its easy, finding a commercial one that does this is going to > be real hard). If you want to use a real wordclock you will need a > frequency multiplier to take wordclock up to one of those two > frequencies. > > If you want to be able to change the sample rate on the wordclock you > be better off injecting the clock after the clock mux in the touch. > > You COULD implement a sync through S/PDIF with a S/PDIF receiver > appropriately configured. Many of these can be setup to output the above > clock frequencies. > > I have personally done the external clock replacing the crystals > approach, it works very well. Of course I build my own DACs so I can use > whatever frequencies I want. One nice advantage of this is the touch can > now use its normal sample rate switching mechanism. I have the DAC > reading the optical S/PDIF out from the DAC, it decodes the stream and > figures out what sample rate is being used and automatically sets the > DAC to use the right local clock. So you get the advantage of local > clocks in the DAC with the source synced to those clocks AND the source > can do its normal automatic sample rate switching. > > But it does take simple surgery of the touch. > > John S.
I believe Cullen Circuits http://www.cullencircuits.com/ in California has done these type of mods. They presently add clocks to SB devices so they can be slaved to a master clock in a device like an Empirical Audio Pace Car. -- firedog Tranquil PC fanless WHS server running SqueezeCenter; SB Duet through Empirical Audio Pace Car; TACT 2.2XP; MF X-150 amp, Sonus Faber Concerto; Mirage MS-12 sub; Dual 506 + Ortofon 20 (occasional use); sometimes use PC with M-Audio 192 as digital source. SB Boom. Arcam CD82 which I don't use anymore, even though it's a very good player. ------------------------------------------------------------------------ firedog's Profile: http://forums.slimdevices.com/member.php?userid=11550 View this thread: http://forums.slimdevices.com/showthread.php?t=74585 _______________________________________________ audiophiles mailing list [email protected] http://lists.slimdevices.com/mailman/listinfo/audiophiles
