Phil Leigh;419513 Wrote: > ah. hmmm... > But don't dacs auto-detect the clock frequency from the recovered spdif > clock? Is this about supporting a mixture of sample rate files?
I expose the DAC could detect the clock F, but why not do it as intended with the encoding in the bitstream - it's a LOT easier. Think what the way you suggest is - a reference with a counter and error bounds and two oscillators talking to each other and and and. What I will do is read the speed encoding from the S/PDIF, and use that to power up one oscillator that will generate 96 or 48 kHz, or power up another oscillator that will generate 88.2 or 44.1 kHz. The oscillator will drive the word clock out and the read side of the digital filter and the DAC chips. This is the IDEAL method to clock a DAC, and in fact the entire audio chain now has only a few ps of jitter in the one place it matters- the DAC chip inputs. If one was going to build the best audio music system they possibly could, what Sean has advised, and what I am building, is the way one would go about doing it. About the only thing I'm missing is paralleling, say, 4 DAC chips and offsetting time samples to the DACs by 90 degrees. THat's for another day and involves more work. Having the source clock driving the CD platter is in fact the worst possible way to make a digital music system and it is the most common method. Why? Simple - its the cheapest. -- wayne325 ------------------------------------------------------------------------ wayne325's Profile: http://forums.slimdevices.com/member.php?userid=29916 View this thread: http://forums.slimdevices.com/showthread.php?t=62747 _______________________________________________ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/mailman/listinfo/audiophiles
