[vorbis] Digital Ear evaluation of Vorbis beta 4

[ff123]

For those who haven't yet seen this:

EarGuy's Digital Ear (physiological model of the ear based on work by Frank 
Baumgarte) has just finished rating the sound quality of Vorbis beta 4 at 
128 kbs using 30 random 10-second selections of music:

http://pub41.ezboard.com/fr3mixfrm4.showMessage?topicID=33.topic

Two samples on which the Ear says Vorbis performed uncharacteristically 
poorly are on my iDrive at:

https://www.idrive.com/miyaguch/files/Shared/?curr-node=8821135668693434409

as s27VorbisTest.wav and s37VorbisTest.wav.

After listening to them, I can probably agree with s37, which has a nasty 
laserbeam-like artifact starting at about 7.5 seconds, in addition to a 
noisy (fluttering) voice, for example at 3.5 seconds, and pre-echo in the 
snaps.  s27, though, is somewhat puzzling to me because I think it sounds ok.

Overall at 128 kbs, Vorbis definitely performed better than FhG FastEnc, 
and probably performed better than Lame 3.88b using --nspsytune at the same 
bitrates (except for the two samples above, which pulled down its rating).

 From my own subjective listening tests, I'd agree that Vorbis beta 4 
sounds better than the best mp3 codecs at 128 kbs for most music.

ff123

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