[vorbis] Vector quantization - is it a bad thing?

[Aleksandar Dovnikovic]

Hi.

I have been talking with Psytel MPEG-4 AAC developer (www.psytel.com)
about various compression formats, and to make it short he said that one
of the main drawbacks of Vorbis is its vector quantization - it introduces
more error then other quantization methods (like non-uniform scalar
quantization, if I got it right), probably used in AAC and other similar
codecs. I know vector quantization is good for low-bitrates, but since I'm
no expert in these areas, I would like if someone (Monty, or someone
knowledgeable) could shed some light on this subject?

Greetings,
Aleksandar

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