Old 04-30-2008, 09:25 PM   #1
Guod3
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Default AB double blind test :media player required...

I'm really unconvinced that high sample rate (>48kHz) music production has any real benefits.
I'd like to subject some people with "golden ears" to a double blind AB test to try to prove my point (or change my mind).
I would like to know of a media player that:
-switches the sample rate of audio interface to suit the file being played (e.g if a 176kHz is loaded, the audio card switches to 176kHz rather than some software downsampling)
-has a random shuffle feature and some way of finding out what was played after the fact
-OR has a text based playlist that can be randomised with batch file or simple program I write myself.

Anyone know of such a player?
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Old 04-30-2008, 10:37 PM   #2
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I think Foobar2000 can do most of what you are asking. It has an ABX component that I use all the time for doing these double blind tests. It's great.

http://www.foobar2000.org/
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Old 05-01-2008, 01:29 AM   #3
Guod3
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I just installed Foobar2000 and it has a very handy tool for ABX comparing two files as you say.
It renders the files to disk and allows for seamless switching during playback.(Great for comparing files of the same samplerate). Problem is I want to ABX hardware samplerates by prepreparing audio files by recording material at 192kHz and playing it back alongside the same recording downsampled to a 48kHz file. I will also do the reverse: record some material at 48kHz and create an upsampled 192kHz file to compare it to.
Winamp will switch the audio interface sample rate as required by the file. If I can invoke winamp from the command line then I can make a utility to write a randomised batch file.
Maybe there is an easier way?
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Old 05-02-2008, 08:54 AM   #4
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I've never used it myself, but I wonder if WinABX would be worth a try?

http://www.kikeg.arrakis.es/winabx/
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Old 05-02-2008, 10:35 AM   #5
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Quote:
Originally Posted by Guod3 View Post
I'm really unconvinced that high sample rate (>48kHz) music production has any real benefits.
I'd like to subject some people with "golden ears" to a double blind AB test to try to prove my point (or change my mind).
I've successfully completed a blind test in this thread:
http://www.cockos.com/forum/showthread.php?t=20338

But since the responders decided not to test it for themselves, I mirrored the post over at hydrogenaudio, with the sample:
http://www.hydrogenaudio.org/forums/...ic=17118&st=50


My conclusion was that the differences (my test was 44.1khz vs 96khz) were so minuscule and tiny, that you would have to listen to a tiny sample an absurd amount of times in a completely closed environment (headphones) to be able tell the difference (which was extremely hard to differentiate, even then). For all intents and purposes, I still feel that it is a waste of space and processing time for recording sample rates greater than 44.1khz.

Quote:
Originally Posted by Guod3
Anyone know of such a player?
Foobar2000 works great for ABXing.
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Old 05-03-2008, 04:12 AM   #6
Guod3
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The essence of the AB test I want to do is comparing content at the different sample rates out of the same audio interface. Foobar ABX works by comparing files at a common SR, great for many comparisons, but not what I need right now.
WinABX is nearly perfect for the tests I want to do, except for one problem:
I've discovered that when my audio interface (Audiofire12) changes SR a small click is audible. To mask this I plan to play a tiny clip at a third sample rate so that there is a always a click and hence no audible clue that may give clues to the listener (no click would mean that there was no change of SR, and would provide a clue to the listeners, spoiling the objectivity of the test)
The winamp playlist is a simple text file, so I'll write a program that generates a randomised playlist and I'll print out a questionaire for the listeners to select which sounds best at each point in the playlist.
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