Distortion and noise. Either the DUT is faithfully replicating the input signal or it isn't. This is a rather simple electrical measurement and one done routinely. For the example you gave earlier (the presence of bass causes the treble to blur), one would look for intermod and PS modulation products in the output spectrum. This isn't rocket science.
Jakob2 said:
Hi Jakob,
As far as I know, a force test is done to establish preferences between two clearly different products. For example, whether people would prefer an Arctic Gray car color over a Solar Gold car color. I don't think that is appropriate when yoiu want to find out if there are (audible) differences in the first place. But I am not very familiar with that type of test. Do you have a link to more info on this?
Jan Didden
janneman said:
For a short explanation, just take a look here:
http://www.tonmeister.ca/main/textbook/node361.html
A more detailed example for the usage of forced choice tests is this:
http://www.ak.tu-berlin.de/fileadmin/a0135/Magisterarbeiten/Karl_Roman_Magisterarbeit.pdf
(Audibility of signal reflections, Magisterarbeit), unfortunately written in german.
A lot of books for sensory evalutation techniques cover this topic.
It sometimes isn´t so obvious, but double blind testing removes only one certain type of bias, all other possible forms of biases remain unadressed and the experimentator has to take them into account.
Wishes
myhrrhleine said:
Well, if you replace the "I" by a large number of listeners doing a large number of trials, you can say that you are, for instance, 99,99% sure that there is no audible difference. Of course, at one day somebody may turn up who scores 95% right in the test, and that then proves that there is indeed a difference. But that difference is then so subtle that only 1 listener in 1000 can hear it.
For a manufacturer it will probably not enough to put money into that difference. Much better to put money in some marketing to convince the other 999 that there is a large difference that you can't miss, unless you are deaf!
Jan Didden
janneman said:
Well, if you replace the "I" by a large number of listeners doing a large number of trials, you can say that you are, for instance, 99,99% sure that there is no audible difference. Of course, at one day somebody may turn up who scores 95% right in the test, and that then proves that there is indeed a difference. But that difference is then so subtle that only 1 listener in 1000 can hear it.
For a manufacturer it will probably not enough to put money into that difference. Much better to put money in some marketing to convince the other 999 that there is a large difference that you can't miss, unless you are deaf!
Jan Didden
Supposedly, this thread is about the blowtorch.
It isn't for the 99.99% that can't hear the difference, but rater that small group that can.
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