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. -- JohnSwenson ------------------------------------------------------------------------ JohnSwenson's Profile: http://forums.slimdevices.com/member.php?userid=5974 View this thread: http://forums.slimdevices.com/showthread.php?t=74585 _______________________________________________ audiophiles mailing list [email protected] http://lists.slimdevices.com/mailman/listinfo/audiophiles
