Patrick Dixon;131267 Wrote: > > Correct - although you still need the analogue filter, it's much a much > less demanding spec. OK, just to make sure I've understood this correctly. Say we have a 44.1kHz signal. Putting it through a non-oversampling DAS, the repeated spectra start at 44.1kHz. If we upsample it to 88.2kHz and then feed it through a NOS DAC running at 88.2kHz, then the repeated spectra start at 88.2kHz, which of course allows for a less destructive (in the audio band) post-DAC analogue filter. But in practice how is this any different than using simple 2x oversampling? That would move the repeated spectra out to the same place.
I'm still struggling to see the point of upsampling rather than oversampling. Indeed, I seem to recall that the theory behind oversampling says that it doesn't matter what the values of the extra samples you stuff in are. So in that respect, upsampling seems to be just a specific case of oversampling. The only purpose I can see for upsampling (with interpolation) is that it allows you to use non-integral sample rate multiplications (eg. 44.1 -> 96). But what's the practical benefit of that? -- cliveb Performers -> dozens of mixers and effects -> clipped/hypercompressed mastering -> you think a few extra ps of jitter matters? ------------------------------------------------------------------------ cliveb's Profile: http://forums.slimdevices.com/member.php?userid=348 View this thread: http://forums.slimdevices.com/showthread.php?t=26685 _______________________________________________ audiophiles mailing list [email protected] http://lists.slimdevices.com/lists/listinfo/audiophiles
