[vorbis-dev] Spectral band replication

[Jan.Tangring at et.se]

>>  Do you (or the ogg vorbis community) understand how SBR works? There is
>>  info on http://www.codingtechnologies.de/technology/sbr.htm
>>  bnut I am guessing this infop is not enough to explain the technology.

Robert Voigt:
>I haven't heard about SBR before. After reading that webpage I can say the
>following:  [ . . . ]  I don't think SBR will give an improvement 
>such that 64kbps will sound as
>good as 100kbps conventional mp3.

This seems to contradict, and with a margin, the current statement of Thomson
multimedia. Thomson multimedia says MP3PRO 64 kbps sounds like MP3 at
128 kbps. Thomson is marketing MP3PRO as a technology for doubling the
capacity of portable MP-equipment.

Thomson:
"The new codec, dubbed "mp3PRO", provides 128kbs performance at a 64kbs
encoding rate, nearly doubling the digital music capacity of typical 
flash memory. "
-- http://www.thomsonmultimedia.com/vus/04/042/01/090101.htm

I am trying here to determine a proper level of skepticism.

I've seen double blind results for MP3PRO at 24 kbps vs MP3 at 32 kbps.
What I have not seen are results for higher speeds.

On the other hand ... I am assuming Thomson has made such tests. 
Would they really go
public with this claim if they had not?

Am I perhaps being naive?

p.s.
I am on the vorbis-dev list now so you don't have to cc me.

-- 
-- Jan Tångring, reporter Datateknik 3.0 (www.datateknik30.se)

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