Google for "zwicker 7 just-noticeable sound changes".
That seems to be JND for amplitude modulation at 4 Hz, versus absolute volume differences.
[b]Study Authors Year Published Min. Detectable Fluctuation le[/b]Reisz 1928 ~1 dBDimmick & Olson 1941 JND = 1.5 dB to 3 dBAtal, et. al. 1962 ~ 1 dBJestaedt, et. al. 1977 JND @ 80 dB = 0.5 dB JND @ 5 dB = 1.5 dBToole and Olive 1988 .25 dB for a 5kHz resonance, Q = 1
a chart that won't cut and paste nicely to here (but I tried)
Differences as small as 3 millibels have been repeatedly detected in otherwise identical equipment.
Quote from: mzil on 21 January, 2012, 01:29:59 AMa chart that won't cut and paste nicely to here (but I tried)I tried something else. How does that look? Better than all those CRLFs and massive amounts of whitespace, I think! It wasn’t difficult to fix, so please take the couple of minutes that would be needed in future cases.
Quote from: Speedskater on 20 January, 2012, 05:47:42 PMDifferences as small as 3 millibels have been repeatedly detected in otherwise identical equipment.I've participated in non-blind listening tests where "Differences as small as 0 millibels have been repeatedly detected."Did the poster give any references for his 3 mB JND claim or was it just another attempt to keep forums busy ?
Thanks, that looks much nicer.
I'm sure you are correct that it was not difficult for you to fix, however you have some knowledge about cutting and pasting charts/diagrams from websites to forum text that I don't possess. My failure to present the data in a nice compact chart had nothing to do with my "not taking the couple of minutes necessary", but rather my complete lack of training in such matters. [. . .] Please tell me what program you are using to manipulate the chart when you paste it here, and I will be able to hopefully download the program for free and learn how to do this on my own for future use.
So Ethan is looking for more factual information.
No! That search string was intended to lead you to the book "Psychoacoustics: Facts and Models" by Zwicker and Fastl, which has an entire chapter on that topic (chapter 7, hence the "7 ..."). You should be able to browse that book through Google Books. Recommended buy, btw.
Some historical references, including a chart that won't cut and paste nicely to here (but I tried), below
0.03 dB maybe?
Ethan, have you seen this? Not JND , but might be pertinent