[vorbis] And the winner is... (C't audio-codec test)

[Robert Michel]

Salve,

the German IT-Magazin (#1) www.heise.de/ct has made an
audio-codec test online. The reader were asked to download
2 x 7 audiofiles, listen to them and rank them (As I wrote before)
http://www.xiph.org/archives/vorbis/200208/0185.html

The 7 files have been Wave, MP3, MP3Pro, AAC, Ogg Vorbis,
WMA, RealAudio in 64kBit/s and 128kBit/s for a stereo sample
of 3 genres: pop, jazz, classic. The files had individually anonymous
names, except one addional file as referenze. The usere
had to register with their Email and got individuell set of testfiles.
To do the test twice, you have to download 26 MB again and to
relisten to each file.

7240 User downloaded the files between 22. and 29. September,
3295 user fill in their vote about 64kBit/s samples
2785 their vote about 128kBit/s samples. (The 128kBit/s test was
realy hard, so some user disclaim to fill in, too.

voting result for 64 kBit/s:
p1=place one, sound most similar to original
p7=place seven, sound most different to orginal

Wave 
p1:41%__p2:21%__p3:15%__p4:10%__p5:07%__p6:05%__p7:01% 
OggVorbis
p1:25%__p2:21%__p3:17%__p4:13%__p5:11%__p6:10%__p7:03% 
MP3Pro
p1:11%__p2:23%__p3:26%__p4:18%__p5:15%__p6:06%__p7:01%
WMA
p1:10%__p2:17%__p3:17%__p4:22%__p5:23%__p6:10%__p7:01%
AAC
p1:07%__p2:12%__p3:17%__p4:26%__p5:22%__p6:14%__p7:02%
RealAudio
p1:04%__p2:05%__p3:08%__p4:10%__p5:20%__p6:51%__p7:02%
MP3
p1:01%__p2:01%__p3:01%__p4:01%__p5:02%__p6:04%__p7:90%

<p><p>voting result for 128 kBit/s

Wave
p1:21%__p2:17%__p3:15%__p4:13%__p5:13%__p6:11%__p7:10%
OggVorbis
p1:21%__p2:16%__p3:15%__p4:13%__p5:13%__p6:12%__p7:10%
WMA
p1:13%__p2:14%__p3:15%__p4:14%__p5:16%__p6:17%__p7:11%
RealAudio
p1:12%__p2:15%__p3:14%__p4:18%__p5:14%__p6:14%__p7:13%
MP3Pro
p1:11%__p2:13%__p3:16%__p4:14%__p5:15%__p6:15%__p7:16%
MP3
p1:11%__p2:14%__p3:15%__p4:15%__p5:16%__p6:16%__p7:14%
AAC
p1:11%__p2:11%__p3:12%__p4:12%__p5:14%__p6:14%__p7:26%

<p>Anything else to say than "congratulations to the ogg Vorbis
developer" ?

128k/Bits was for 42% a 50:50 guess which is the orginal :-)

The articles sum was that already with 64kBit/s the journalist made
change by mistake between orginal and Ogg Vorbis and that the fight
on the market for new codecs will be hit by 64kBit/s or lower bitrate.

The magazin c't 19/2002 has 13 page articles about this test on page
94 and will be in the shops on monday. I hope they will have an article
on their webpage, too.

Cheers,
rob
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