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Digital Drive Upsamplers, DACs, jitter, shakes and analogue withdrawals, this is it. |
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Digital Drive Upsamplers, DACs, jitter, shakes and analogue withdrawals, this is it. |
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In Reply to: RE: Your claim is completely incompatible with his statement posted by morricab on June 20, 2024 at 03:08:42:
I scanned through the two AES papers and the conclusion is convincing that THD and IMD doesn't match the subjective scoring of their test group whereas their Gm metric (bad choice of symbol as Gm means something else to a lot of people) does correlate much better. There is much to pick over - in the first part they don't quantify masking. Yes it is a psychoacoustic thing but how much effect does it have and why choose a cos^2 weighting factor? I also question one of their precepts that distortion will be more apparent at low signal levels than high signal levels - that needs some explaining as distortion grows quicker than the signal level that causes it (i.e. if a signal increases by 1dB any second harmonic will grow by 2db, third harmonic by 3dB etc).We aren't told what the 21 transfer functions are nor their correspondance to trial number. We do know one/some/many have severe discontinuities - are those really relevant for high-end audio? And they remove 6 of those transfer functions at the end because they don't fit the scatter plot so well (at least they were open enough to admit this as data manipulation is often a big problem in academic papers).
But, the big unanswered question is whether a low distortion system is somehow worse? We don't know because they don't detail the transfer functions! We can probably conclude that many non-linearities are not that audible, or audible at all, but we can't conclude that low distortion devices are somehow subjectively inferior. So it is a bit of a shield for audiophiles to stand behind and an excuse for high-end audio designers to not work too hard but not the full story.
Edits: 06/20/24
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Follow Ups
- I think GedLee did his best work in Rush - 13th Duke of Wymbourne 12:02:45 06/20/24 (1)
- RE: I think GedLee did his best work in Rush - morricab 05:45:55 06/21/24 (0)
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