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NPR botched the protocol in other ways. The samples have to be sync'd, and the tester to be able to switch between them at will -- with a small crossfade to pr
by rectang 11y ago
NPR botched the protocol in other ways. The samples have to be sync'd, and the tester to be able to switch between them at will -- with a small crossfade to prevent the glitch from throwing you off.
An old buddy of mine, Dan Dugan, hung two pink sheets at an Audio Engineering Society conference on opposite walls to illustrate this point, asking people, "Are they the same color?" It would be trivial to distinguish them side by side, but accuracy is greatly reduced when they are distant in time or space. Human perception is all about edges, not about absolute measurements.
- Udik 11y agoI don't agree. What you propose would be the test "are you able to tell the difference between the compressed and the uncompressed sound when you compare them directly"? While this test is "are you able to appreciate the difference between a compressed and an uncompressed piece of music"? If the two seconds it takes you to switch from one version to the other are enough to prevent you from spotting the difference, I'd say that whatever difference there is is likely to be irrelevant to the listening experience.