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General Asylum General audio topics that don't fit into specific categories. |
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General Asylum General audio topics that don't fit into specific categories. |
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In Reply to: RE: Watched the JJ Video..... posted by Todd Krieger on March 12, 2024 at 20:51:05:
> > In the case of clinical studies the comparison is between the actual thing being studied and the control group taking the placebo. > >
> The context here is a singular test subject...... He's not comparing anything personally. >
Not sure where you are going with that. Proctors don't do personal comparisons. They proctor studies. Doesn't matter if they are testing for audibility of something or for physiological effects of something. The basic duties are the same.
> One test subject might be evaluating the test product, another test subject might be evaluating the placebo......>
Very few clinical studies use placebos with their control groups anymore. Pretty much only when results have to be anecdotal such as with pain killers or anti depressants or anything that is measured perceptually.
> But this has nothing to do with ABX testing, which determines whether a test subject can discern differences between "A" and "B" by guessing "X" correctly, in repeated trials. (The test conductor, if separate from the test subject, need not even be "blind" in an ABX test.) >
They do for the test to be double blind. That is a simple tautological fact.
> > > The other thing I don't agree with was his claim that CD is "orders of magnitude" more accurate than vinyl...... There is no tangible way to even confirm (or refute) that. > > >
> > Sure there is. Objective measurements. They both can be objectively measured for accuracy because we can directly compare the input to the output and objectively measure the differences. A simple bull test will completely and thoroughly address every aspect of their respective audio signals and give us clear quantifiable objective measures of their accuracy to the original signal. > >
> How does one measure "accuracy?".....>
You compare the input to the output and objectively measure the difference.
"Even JJ has admitted it is not a clear-cut phenomenon that is measurable."
Quite the opposite. JJ explicitly says that with anything in audio where we can compare the input directly to the output we can absolutely and fully measure accuracy of that component.
"(Distortion is measurable, but there is a lot more to accuracy than just measuring distortion.)"
Accuracy by definition is how close your DUT objectively gets to your reference. In the case of audio all differences are easily measured through a simple level matched null test.
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Follow Ups
- RE: Watched the JJ Video..... - Analog Scott 03/13/2400:10:52 03/13/24 (0)
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