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Succesful ABX of 24/96 vs. 16/44.1
googlebot
post Jun 7 2010, 18:30
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The maximum sample rate of my digital output is 96 kHz at 24 bit. To eliminate as many variables as possible I locked the output to that format and pre-converted the test files accordingly using the highest quality options available. As source material I have used the 24bit/192kHz track from this thread.

The high resolution contestant (24/96) was produced using the following settings:

CODE
sox Sample_192000Hz_24bit.wav 24-96000.wav rate -v 96000 dither -s


That is the setting recommended by Sox' developers for SRC with large target rates. Basically linear phase filters and sloped TPDF dither.

For the Redbook contestant, the 24bit/192khz track was first down-sampled to 16bit/441000Hz:

CODE
sox Sample_192000Hz_24bit.wav -b 16 16-44100.wav rate -v 44100 dither -s


And then up-sampled to 24bit/96kHz, again at the highest quality settings:

CODE
sox 16-44100.wav -b 24 16-44100-24-96000.wav rate -v 96000 dither -s


My hearing tops at about 17 kHz. Still I can hear pretty clear difference over a pair of Elac FS 607 X-Jet speakers, which are rated for 28-50000Hz (IEC 268-5):

CODE
foo_abx 1.3.4 report
foobar2000 v1.0.3
2010/06/07 18:25:51

File A: C:\Dokumente und Einstellungen\Christian\Desktop\16-441to24-96.wav
File B: C:\Dokumente und Einstellungen\Christian\Desktop\24-96.wav

18:25:51 : Test started.
18:26:44 : 01/01  50.0%
18:27:09 : 02/02  25.0%
18:27:26 : 03/03  12.5%
18:27:44 : 04/04  6.3%
18:28:00 : 05/05  3.1%
18:28:21 : 06/06  1.6%
18:28:38 : 07/07  0.8%
18:28:52 : 08/08  0.4%
18:29:06 : 09/09  0.2%
18:29:17 : 10/10  0.1%
18:29:33 : 11/11  0.0%
18:29:46 : 12/12  0.0%
18:30:03 : 13/13  0.0%
18:30:26 : 14/14  0.0%
18:30:42 : 15/15  0.0%
18:31:04 : 16/16  0.0%
18:31:08 : Test finished.

----------
Total: 16/16 (0.0%)


I do not think, that I actually hear the presence or absence of stationary HF content. But what I am hearing is louder and somewhat smeared sounding transients in the Redbook version. That is exactly the type of pass-band artifact to be expected from low-pass filtering, but until lately I hadn't considered that to be audible, when done right. And since that step is necessary it can also not be avoided for Redbook delivery.

I do not hear a difference over my regular Canton speakers, which top at about 20kHz! Neither over my Grado headphones. Since both act as a mechanical low pass, I think they just cause the same artifacts in the pass band as the digital low-passing.

Until today I have mostly laughed at high resolution apologists. But that ABX result somewhat changed my perspective. Maybe those, who say that you do need excellent speakers to hear a difference are actually right? On the other hand this is just one very artificial and synthetic sample. The results can very likely not be extrapolated to real world recordings. I don't know. What do you all think?

The speakers are here for testing right now, but I think I'm going to buy them.

PS: I have uploaded the samples.

This post has been edited by googlebot: Jun 7 2010, 18:36
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Brand
post Oct 20 2011, 09:44
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I did a quick test and couldn't ABX them.
But for those who can easily hear it, I'd like to propose testing 24/44.1 instead of 16/44.1, just to see if the difference is due to SRC or to bit reduction/dithering.

And eventually 16/96 vs 16/44.1.

And perhaps with a different resampler.
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Posts in this topic
- googlebot   Succesful ABX of 24/96 vs. 16/44.1   Jun 7 2010, 18:30
- - greynol   Have you tried other resampling algorithms? After...   Jun 7 2010, 18:53
- - googlebot   I really can't explain it, yet. Maybe somethin...   Jun 7 2010, 19:27
- - greynol   I don't have a good set of headphones or a qui...   Jun 7 2010, 19:32
- - IgorC   CODEfoo_abx 1.3.4 report foobar2000 v1.0.3 2010/06...   Jun 7 2010, 20:23
- - Cavaille   Id love to do it but right now Im suffering from...   Jun 7 2010, 20:54
- - udauda   16_44to24_96.wav has an unusual HF noise component...   Jun 8 2010, 02:01
|- - googlebot   QUOTE (udauda @ Jun 8 2010, 03:01) 16_44t...   Jun 8 2010, 03:43
|- - greynol   QUOTE (udauda @ Jun 7 2010, 18:01) it see...   Jun 8 2010, 07:21
- - JSW   Well, I think it would be a good idea to repeat th...   Jun 26 2010, 08:38
- - Eudaimonius   Could this be related to what's described in t...   Jun 26 2010, 09:41
- - Arnold B. Krueger   googlebot: I don't see anything obvioiusly wr...   Jun 27 2010, 06:34
|- - googlebot   Wouldn't IM artifacts within the audible band ...   Jun 27 2010, 07:39
||- - Arnold B. Krueger   QUOTE (googlebot @ Jun 27 2010, 02:39) Wo...   Jun 27 2010, 23:34
|- - Notat   QUOTE (Arnold B. Krueger @ Jun 26 2010, 23...   Jul 4 2010, 18:23
|- - Arnold B. Krueger   I can definitately hear 0.1 % nonlinear distortion...   Jul 7 2010, 11:03
|- - JSW   I don't think I'm prepared to perform eith...   Jul 7 2010, 21:45
- - JSW   I just tried an ABX with this sample. To eliminat...   Jun 28 2010, 04:53
- - JSW   I just did a listening test on the effect of downs...   Jul 3 2010, 20:36
- - onlyconnect   I am surprised this thread did not prompt more dis...   Oct 18 2011, 09:28
|- - Arnold B. Krueger   Certain 24/96 recordings will sound audibly differ...   Oct 18 2011, 19:48
- - IgorC   Here ABX test was successful again on those sample...   Oct 19 2011, 04:27
- - Canar   24/96 vs. 16/44.1 has two independent variables. T...   Oct 19 2011, 04:29
- - IgorC   Good point, Canar, I was thinking too about tryi...   Oct 19 2011, 04:51
|- - onlyconnect   QUOTE (IgorC @ Oct 19 2011, 04:51) I can ...   Oct 19 2011, 09:42
|- - IgorC   QUOTE (onlyconnect @ Oct 19 2011, 05:42) ...   Oct 20 2011, 01:41
- - Wombat   I tried these samples with my HD-590 and X-Fi Xtre...   Oct 20 2011, 01:01
- - Wombat   Now that baffled me. I loaded the 2 samples into ...   Oct 20 2011, 02:08
- - Brand   I did a quick test and couldn't ABX them. But ...   Oct 20 2011, 09:44
- - bandpass   Let's eliminate resampling completely to begin...   Dec 3 2013, 10:56
|- - Arnold B. Krueger   QUOTE (bandpass @ Dec 3 2013, 04:56) Let...   Dec 4 2013, 13:03
- - Wombat   I must have overlooked these intermod test samples...   Dec 4 2013, 14:50


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