ezkcdude;182151 Wrote: > AFAIK, the single advantage (theoretically, at least) of upsampling is > to lessen the harmful effects of digital "brickwall" filters of modern > DAC chips.
Ok, well let me go look into that. But the fact remains that to upsample you have to interpolate, and if there is any complexity in the signal at all there is only heuristic methodology to fill in the interleaving samples. It might be a simple heuristic, like double the samples. It might be more complex, like pick half way between sample one and three. Or, if you have a model of the sound source (for example, a human voice) you can likely do a pretty good job of interpolation. But I don't see how to do that in general. So, yes, it is about the interleaving sample not being there from an information perspective... This is pure information theory stuff. I didn't claim audibility or anything about audio quality. Its just a fact you have to interpolate the intervening sample. I guess the risky part here is that there is a claim of "making it sound better" which risks veering into the alternate world of audiophile physics so perhaps I should qualify my statement. Let's say this. Accepted information theory says you cannot add original information back into a signal simply by upsampling, nor can you increase the information content of the signal - you can only interpolate an estimate. -- Eric Carroll Transporter-Bryston 3B SST-Paradigm Reference Studio 60 v.4 SB3-Rotel RB890-B&W Matrix 805 SB3-Pioneer VSX-49TXi-Mirage OM7+C2+R2 ------------------------------------------------------------------------ Eric Carroll's Profile: http://forums.slimdevices.com/member.php?userid=9293 View this thread: http://forums.slimdevices.com/showthread.php?t=32940 _______________________________________________ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/lists/listinfo/audiophiles
