[vorbis-dev] patents and separate entropy coding

[Monty]

On Mon, Dec 18, 2000 at 01:54:40AM +0100, Segher Boessenkool wrote:
> > Vorbis also doesn't encode the spectral results of the MDCT.  The
> > spectral values are passed through a whitening filter first (the
> > 'floor' is effectively an IIR filter), and this distiction is
> > important.
> 
> It is FIR, not IIR, I think? Only a finite number of samples
> are affected?

It is an IIR filter representation and it's only used to encode a
frequency response.  |H| is computed directly from the LSP
coefficients, and the filter is never actually applied ['rung'] in the
time domain.

Monty

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