>
> >(-k, by the way, is *always* a bad idea. It overrides LAME's
> >default lowpass filters. It will cause ringing and twinking
> >at 128kbs)
>
> Are there examples for this? When I did some listening tests I noticed the
> missing frequencies but nothing else. Does the FhG encoder still do this
> (cutoff), too? Would it be feasible to use a slightly higher --lowpass or
> does sfb=21 interfere? What kind of curve is used by the lowpass?
>
The filter uses a 32 band "polyphase" filter bank. The default
behavoir is to zero out the last N banks, but you can add some kind
of curve to this by increasing --lowpass-width. N depends on
the compression ratio: the less compression, the less filtering.
The amount of filtering used is very similar to FhG at >= 128kbs.
At low bitrates, the automatic filtering code still needs work.
>
> Where can I find information about the -X -Y and -Z options? I know that
> they're experimental and undocumented, but...
>
-X: picks which of 7 algorithms will be used to determine if
one noise 'signature' sounds better than another.
-X should now be considered a permanent option. -Y and -Z change
from release to release and are just for testing things.
Right now, -Y does nothing, and -Z turns on Takehiro's CBR
subblock gain code.
Mark
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