[vorbis-dev] lossless ogg encoding with good compression rate

[Christian.Buchner]

> Vorbis + error may not be a good way to do lossless compression, but has 
> anybody put any thought into a DCT- or wavelet-base lossless 
> compression? 

There is a master thesis available on a transform based lossless
compression scheme (German)

http://www.nue.tu-berlin.de/wer/liebchen/ltac.html

I found it a very interesting read. The method is called "Lossless
Transform Audio Coding" - or LTAC.

One problem is that it is non-trivial to determine the accuracy needed
to quantize the DCT coefficients such that the reconstruction in the
time domain does not contain a lot of errors. And these errors need
to be corrected to be lossless! However, since it is only a few values
that differ, this compresses well.

Christian

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