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listening tests help, for an audio codec I developed
legg
post Jun 18 2005, 19:51
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How can I rate how good or bad will the audio codec be on average?

I'm thinking on doing at least 21 ABX trials on each file and if the subject managed to tell a difference and the guess probability is low I'd also take into account a 1-5 point scale to measure the perceived quality.

So far I have analized one subject, he did pretty well on most tests, except one, where the results where these:
15 out of 29, pval = 0.500

AFAIK, p<0.05 is good to be certain that he didn't know by chance, what about the rest?
How do I interpret that?, is the codec transparent for him at that test?
What are the ranges of the guess probabilities and how should I interpret them?

Thanks in advance.

This post has been edited by Luis G: Jun 18 2005, 19:52


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ff123
post Jun 19 2005, 19:27
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For an experienced listener like you, I'd definitely dump the ABX and just go with the ratings.
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