JohnSwenson wrote: > I hope I can try and do this without pictures, I don't have time right > now to draw some nice pictures, so I'll try and be clear with the words. John, thanks for your additional explanation. Let me summarise what I think you're saying and I hope you can tell me if it's correct.
Here are the stages involved when using oversampling: 1. Stuff zero samples between the actual samples. (Actually, any random values will do, zero just happens to be convenient, right?) 2. Use a digital filter to remove the artefacts above Fs/2. 3. Feed the oversampled signal (which now has a much higher Fs) into the D/A stage. 4. Resulting analogue signal has aliasing artefacts much higher up the frequency spectrum and so a much gentler analogue reconstruction filter may be used. Is that about right? Until now, I hadn't appreciated that step 2 was required. I must say that it had always seemed unintuitive that just stuffing extra samples into the data stream would shift the artefacts up, but I have never fully understood the mathematics and just accepted it based on the explanations of other authorities - who presumably were oversimplifying. Now you've explained it in greater detail, it actually makes sense. ------------------------------------------------------------------------ cliveb's Profile: http://forums.slimdevices.com/member.php?userid=348 View this thread: http://forums.slimdevices.com/showthread.php?t=94352 _______________________________________________ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/mailman/listinfo/audiophiles
