[vorbis] rc3 and lowpass filters

[Monty]

On Wed, Feb 13, 2002 at 09:08:46AM +0100, Nicola Larosa wrote:
> >I was wondering about the lowpass filter applied at the different
> >quality levels. It seems that the 16kHz cut-off is still there at
> >quality 3.
> 
> I can attest that on many samples the "-q 3" level goes up to 18 KHz, and 
> at least on one sample (EncoderHell, found on AirWindows) it goes up to 22 
> KHz.

The hard lowpass is set in lib/modes/psych_44.h.

-q3 goes to 17.9 and -q4 to 20.5

Monty

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