[vorbis] MP3/Vorbis comparision

[Giuliano Pochini]

> 1. I've generated white (not pink!) noise, 5 sec long with -6dB level.
> 2. encoded this file with "oggenc" q3 up to q7
> 3. decoded them with "oggdec" back to wav.
> 4. made a frequency analysis over the uncompressed original and
>    frequancy analysis over the compressed and decompressed files.
>
> Result:
> With quality 3, 4 and 5 an high frequency boost at 10 kHz and higher
> is clearly visible. Quality 6 and 7 are ok, frequency response is flat.

High frequency boost in mono files is quite low. Can you try the same
test with stereo samples ? I think the results will not be same as good.

<p>Bye.

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