[vorbis] psychoacoustic model

Ralph Giles giles at xiph.org
Sat Oct 18 05:19:12 PDT 2003



On Mon, Oct 13, 2003 at 09:48:29AM +0200, Vincent wrote:

> when does the psychoacoustic model is used during the coding?
> is it the first step? is it before the floor calculations, the chanel
> coupling and the VQ?

Well, the format is described from the decoder's point of view; the 
encoder is free to do whatever it feels is most appropriate. I don't 
know when the reference implementation does.

> other question? when is huffman used? at the very end of the coding process?
> after the VQ?

Yes. The final results of the floor and residue computations are huffman 
coded.

 -r
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