[vorbis] MP3/Vorbis comparision

[Giuliano Pochini]

> When high frequency boost accur, a increased amplitude is visible.

Yes, of course.

I did some other tests with mono pure tones. You can see
the results here:

g_pochini at virgilio.it/vortest.tgz">http://space.virgilio.it/g_pochini@virgilio.it/vortest.tgz</a>

The tests show strange ripples and pre/post-echo in -q4 encoded
sine of 4410Hz. Vorbis file at -q4 is about 24Kbps and .mp3
is 64Kbps. The spectral analysis show that the ogg file is better
the mp3 even if in time domain it doesn't look so. The strange
thing is the ripple. I tried several frequencies and all quality
levels and there is always a tremolo effect for free.

(The frq spectrum may not be reliable, I don't trust audacity a lot.)

<p>Bye.

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