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Utmost confidence doesn't replace solid evidence

What were the scores of that part of the DBT where musical excerpts were used? THAT would be evidence that is interesting and relevant for consumers. THIS seems to be the only evidence obtained by Lipshitz, however, without a score, what do we know about the value of that evidence? I do not ignore his record, just tell us what the score was and we talk further!


Since we are speaking of presenting misleading information, tu quoque, filii:

In your AES convention paper, page 13:

"The authors have demonstrated the TWO-TONE experiment described above to numerous people on different systems. No one has ever failed to hear the timbral change with phase, and discern the polarity reversal. Indeed, in a double-blind demonstration, the accuracy score was 100% [on a two-tone test] over loudspeakers, and overall, including musical excerpts, the results on the audibility of the polarity inversion of both loudspeaker channels represented confidence of more than 99% in the thesis that acoustic polarity is audible."

What you have omitted here is that, overall, only 84 out of 137 reponses were correct. How many response were correct when musical excerpts were played?


Further, in a letter to Audio Magazine 1994 that passage was further reduced to:


"In a double-blind demonstration....including musical excerpts, the results on the audibility of the polarity inversion of both loudspeaker channels represented confidence of more than 99% in the thesis that acoustic polarity is audible."

You didn;t even mention that part of that confidence was based on TEST TONES.


What evidence? There's that Lipshitz SMWTMS audio group DBT of which the score is not known and that's about it.

I don't count all those experiments where artificial signals were used for obvious reasons. I don't count your own experiments for the reasons outlined before.


Klaus

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Topic - Acoustic polarity, again - KlausR. 02:36:41 05/06/07 (113)
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