[vorbis-dev] Large codebook?

[Kevin Marks]

At 6:51 pm +0300 17/6/01, Juhana Sadeharju wrote:
>Hello.
>
>Earlier I asked if it would be possible to use one common large
>codebook for all audiofiles. Can you estimate how the following
>system would work?
>
>1. The audio would be divided to 16 samples blocks.
>2. For each block, the first sample would be stored without any encoding.
>3. Linear interpolations between the stored samples are computed.
>4. The residues (length of 16 samples) between the original audio and
>the linear interpolation are computed. Residues would go from 0.0 to 0.0.
>5. The residues are vector quantized.
>
>For each 16 samples, one sample and one codebook reference would be stored.
>With 16-bit audio it would mean 1:4 compression ratio.
>
>Comments?

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?

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