OK, I will take this point by point... Robin Bowes Wrote: > > I'm afraid you are wrong in so many ways. >
If so, I'm happy to learn something. > > A digital signal does not have periodicity - it is just a stream of > bits. It is sent over analogue transmission paths as a square wave. > In this case it *is* periodic, as you can see from my example of the digitized sine wave. I think perhaps there is a confusion about the term square wave - to me that means simply a signal which oscillates from one level to the other, with sharp transitions, and with a fixed exact periodicity. That of course contains zero information - at best it corresponds to one particular stream of bits. A general digital signal oscillates back anf forth, but it is something like 0111000101010011 or whatever, and is square only in the sense that the voltage takes two values only. > > The receiver of the signal decodes the square-wave signal and also > extracts the timing information from the same signal. > > As Pat as already pointed out, jitter is caused by errors in detecting > the transition between 1 and 0 in the square wave in the analogue > domain, which causes timing errors. So, the space between samples > varies > from the "standard" (for 44.1kHz sample rate)1/1,411,200 of a second. > This means that the analogue signal reconstituted from the digital > signal has different frequency content than the original input signal. > R. Yes, that is the basic point about jitter. What I thought we were discussing is HOW the analogue signal you end up with differs from the original. In other words, what is the spectrum of the "noise" - the extra stuff which has been added by jitter? Your original claim (perhaps I misunderstood you) was that that spectrum is determined by the original music. It turns out that claim is partly correct, as I was trying to explain. -- opaqueice ------------------------------------------------------------------------ opaqueice's Profile: http://forums.slimdevices.com/member.php?userid=4234 View this thread: http://forums.slimdevices.com/showthread.php?t=24670 _______________________________________________ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/lists/listinfo/audiophiles
