DCtoDaylight;332327 Wrote: > > > I would expect that we would find that the audibility of jitter depends > on both the amplitude and the type. We could probably tolerate much > higher levels of totally random jitter, than a single fixed frequency > peak. > >
This does seem to be true. I've run a bunch of tests where I use a spectrum analyzer to look at the spectrum of the clock directly at the DAC chip in a bunch of different configurations. (note this is looking directly at the clock, not the spectrum of the audio produced by the DAC) One interesting comparison was a S/PDIF receiver to a USB receiver. The S/PDIF looked very clean, low noise floor and a sharp central spike. BUT it had two very narrow spikes at high amplitudes. The USB looked very "dirty" in comparison, the noise floor was much higher and it had several broad spikes with lots of jaggies on them. But the amplitude of those spikes was considerably less than the spikes on the S/PDIF. Everybody who heard these agreed that the USB sounded much better then the S/PDIF. This agrees with a lot of other measurements, that broadband noisy jitter is less detrimental than high amplitude narrow spikes. BTW getting rid of most of either type of jitter sounds significantly better yet. John S. -- JohnSwenson ------------------------------------------------------------------------ JohnSwenson's Profile: http://forums.slimdevices.com/member.php?userid=5974 View this thread: http://forums.slimdevices.com/showthread.php?t=50147 _______________________________________________ audiophiles mailing list [email protected] http://lists.slimdevices.com/lists/listinfo/audiophiles
