3 Nov
2003
3 Nov
'03
1:23 p.m.
Steve Harris wrote:
On Sun, Nov 02, 2003 at 10:49:17PM +0100, Tim Goetze
wrote:
i don't have any precise cycle-consumption figures (a good reason to
try the polyphase filters one day) but i seem to remember having
figured that they come at equal or bigger cost for comparable stopband
attenuation.
then, their peak at 2 - 3 kHz made me go with the current filters
because it is a characteristic of the circuitry i investigated, and it
comes for free. just seemed to fit so nicely, and i could use the
tools i know best.
though one day i'll try the polyphase design for some exact figures.
the frequency response is mostly due to the
oversampling filters;
unfortunately i am at a loss for good realtime-compatible design
methods for those. it would well be possible to recalculate them
(chebyshev prototypes) but that would take quite a few cycles, and
knowledge about how to move the ripple/s in a chebyshev design
(anyone?).
Have you tried polyphase filters? I've never used them but I've heard they
are good for oversampling. Nice plugin BTW, I've noot been able to play it
myself (my guitars ill),
but the sample recording sounds great.
thanks, it's lovely to hear that from 'Mr LADSPA'. :))
tim