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In Reply to: RE: Verify. Forget about Trust. posted by Tony Lauck on October 7, 2011 at 10:20:55
In some (rare) circumstances, I've had resampling situations that actually resulted in a PITCH CHANGE. How noticeable is a pitch change from 44.1 to 48 or 48 to 44.1? On unfamiliar material, it might go by unnoticed! (This is what, like a "half" semi-tone in pitch change??)
So another test would be to play 44.1 and 88.2 of the same material to make double-sure there is no pitch change going on.
With DTS passthrough test, though, ANY resampling or ANY volume bit change (any change at all, then) will result in thissssssssssss.
It's a good test! And I've tested the test too... :P
You're right, but I would add:
-Trust OR
-Verify using a proven test method
Cheers,
Presto
Follow Ups:
Yeah, proven test method for sure. But I'm not sure how to explain this to people, because if one gets a magic "test box" that says "pass" or "fail" then one ends up having to trust this box. Or trust some inmate that his "proven" method actually works. :-)
Switching between 44.1 and 48.1 amounts to 8 percent, a little more than a half step (e.g. C to c#). Nearly all music lovers will hear this in an immediate comparison but only a minority (those with perfect pitch) are likely to notice this error in isolation. It's much less of a "ha-ha" than running a 45 vs. 33 1/3.
In the past I've managed to trick my system into making gross errors, e.g. 88.2 vs. 44.1. This goes beyond subtle or annoying and enters into the amusing category. (So far it has happened only when I was already trying to "trick" my system, otherwise it would definitely have been annoying.)
Yes. Half a note!
But from 44.1 to 88.2 or 96 anyone should be able to hear the chipmunks.
I work as a technologist in electrical engineering. We're always required to prove "black box" mathmatical models or algorithms with alternate calculations.
Too much "hey we got an answer, wonderful" in some areas.
And G.I.G.O. still applies too...
Cheers,
Presto
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