Phil Leigh;216631 Wrote: > I don't know if this has been suggested before (and if it has then I > humbly apologise)...but: > > With all this hypothesising about clock degradation, jitter etc making > digital transports "sound" different - why can't we really prove this?
Because it's really really hard to hear the effects of jitter at the kind of levels we're dealing with. There are several papers on the audibility of jitter and some controlled tests that have been done. I don't have the links handy but they're out there. > > What would it take to progressively introduce noise or other spuriae > onto a SPDIF connection and see (or rather listen to) what happens? Adding the noise is not hard. The difficulty is that since it's hard to hear, you need expensive equipment to tell you what amount of noise you've added. > What happens if we slap an RC network across a SPDIF, thus messing up > the clock waveform recovery? That's the right idea - all things being equal, less dv/dt == more jitter. So a filter will definitely work to some degree, perhaps a couple hundred ps. However, if you round off the waveform too much, the receiver will fail to lock well before its tolerance for timing noise has been exceeded. A better approach might be to modify the output of the oscillator in the source component, before it goes into the spdif transmitter. So you still have the same signal transitions, only with more jitter. > What happens if we hit a toslink with a big hammer? That might actually be effective. You'd need to break up the plastic enough to introduce some reflections, but still let most of the intended waveform get through. > Is it possible to devise controlled tests for these scenarios? Absolutely! -- seanadams ------------------------------------------------------------------------ seanadams's Profile: http://forums.slimdevices.com/member.php?userid=3 View this thread: http://forums.slimdevices.com/showthread.php?t=37044 _______________________________________________ audiophiles mailing list [email protected] http://lists.slimdevices.com/lists/listinfo/audiophiles
