[vorbis] masking problems in Vorbis beta?

[Bill Pringlemeir]

This page contains details of his analysis.

 "http://users.belgacom.net/gc247244/analysis.htm"

Look at the `original signal' line to explain the low frequency cut
off in the ogg analysis.

 "http://users.belgacom.net/gc247244/ns-ogg.png"

Frequencies above 16 kHz and hard for most people to hear.  I don't
really think that it matters for human ears.  These test are the type
that anal retentive audiophile weenies like to do.

Examine his critic of the MP3 encoders.  His best test is with an
actual song.  Although I would think that Ogg Vorbis would do better at
pure tones, since it uses MDCT.  This is somewhat distressing to me.

The last thing to note is the human ear hears in a logarithm mode.
All of his graphs are linear, which can make things look worse than
they are, 3 or 6 db is not much of a difference.

Maybe someone else can provide better details; I am certainly not
an insider. `Ich Bin Ein Auslander'
       
Bill

>>>>> "Martin" == Martin Reinecke <martin at MPA-Garching.MPG.DE> writes:

 Martin> Hi all, I just came across the following page:
 Martin> http://r3mix.net In the "News" section there is a fairly
 Martin> negative critique of Vorbis; especially it is mentioned that
 Martin> Vorbis "has terrible masking problems". There is also a
 Martin> Vorbis-encoded frequency sweep which shows strong
 Martin> deficiencies at high frequencies, but I suppose this is due
 Martin> to the quite low bitrate of the distributed encoder.

 Martin> I would be glad if one of the Vorbis insiders could comment
 Martin> on that critique. Does the guy have a point or are the
 Martin> problems caused by the low bitrate?


-- 
Ask me the DIFFERENCE between PHIL SILVERS and ALEXANDER HAIG!!
Another dimension is not a sham, I watch! 

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