Impact of listening fatigue , during ABX test.
Reply #21 – 2009-10-15 21:01:29
Hum, ok, I've redone the test with the speakers of my laptop. It was more comfortable than my IEMs , and then I was more relaxed/concentrated while doing the ABX test. Also I didn't find that the section 22.4 sec to 23.0 sec was the best to spot differences, so I changed it to 15.5 sec to 16 sec , following shadowking suggestion that it's very bad at 16 sec. Here is the log, you can ignore all the attempts before last trial reset, or not. But it's only in the last trial that I'm using the 15.5 sec to 16 sec, section.foo_abx 1.3.4 report foobar2000 v0.9.6.8 2009/10/15 18:19:47 File A: C:\Users\mehdi\Desktop\carpenter\Carpenter_128kps_cbr.mp3 File B: C:\Users\mehdi\Desktop\carpenter\Carpenter_FLAC.flac 18:19:47 : Test started. 18:38:54 : 00/01 100.0% 18:39:06 : Trial reset. 18:39:48 : 01/01 50.0% 18:40:44 : 01/02 75.0% 18:43:37 : Trial reset. 18:55:29 : 01/01 50.0% 18:56:41 : 02/02 25.0% 18:58:29 : 03/03 12.5% 19:00:07 : 03/04 31.3% 19:06:17 : Trial reset. 19:11:58 : 01/01 50.0% 19:13:08 : 02/02 25.0% 19:14:10 : 03/03 12.5% 19:14:46 : 04/04 6.3% 19:16:17 : 05/05 3.1% 19:17:16 : 05/06 10.9% 19:21:55 : 06/07 6.3% 19:22:29 : 07/08 3.5% 19:23:15 : 08/09 2.0% 19:24:21 : 09/10 1.1% 19:26:07 : 10/11 0.6% 19:27:00 : Test finished. ---------- Total: 14/18 (1.5%) Also, I'd like to add that it's a pity that the ABX logs do not show which sections are exactly used at each steps. Not sure if it matters, but I used Replaygain for the test. This is not shown in the log too. @greynolI sincerely hope you aren't boosting the level solely in an attempt to help you make out differences between the two samples. I realized that raising too much the volume , makes actually this ABX test harder. Especially because of the high pitched sounds. In my other mentioned test (ADPCM vs CD-XA) I got to raise the volume a lot to find a difference . @pdqWhere you are testing preferences among two or more imperfect encodes you want to use something like ABC/HR. Will study that thing.