[vorbis-dev] Large codebook?

[Juhana Sadeharju]

>Is this going to give results significantly better than IMA-ADPCM, 
>which gives a similar compression ratio for a fairly low decode 
>overhead and simpler decode loop? 

Also the quality matters, but I have no idea. I suppose a VQ method
outperforms the adpcm method because VQ keeps an external codebook but
adpcm just reduced the total number of bytes.

How IMA-ADPCM works? Documentation? What would be the error signal?
Are there any source code? Sox could not decode IMA-ADPCM files I have
found from one game.

Could someone of you tell me how to use the VQ code of Vorbis to
make the codebook for the simple system I proposed?

Juhana

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