G
gst
hi,
i'm a newcomer to filter things and i'm not an engineer (i'm a software
developer) so... don't be too harsh to me ;-)
the problem is: i have to use a low-pass filter (if it matters:
digital, must run on a 32-bit machine using only integers)
right now i'm using a 4-pole butterworth; experimenting a bit i see,
with a cutoff frequency around 100 hz, a delay of about 0.008 secs,
which i would like to make shorter.
i'm no filter expert and basically i don't know where to go; i was
lurking this group with ggroups and if i understand correctly there's
some relation between group delay and filter response sharpness.
what can i do (change type or form of the filter, ...) to have a filter
with short delays and (lower priority if i have to choose....) have a
sharp response?
i would like to know if i have some grade of freedom besides lowering
the pole count....
thank you a lot
gst (novice)
i'm a newcomer to filter things and i'm not an engineer (i'm a software
developer) so... don't be too harsh to me ;-)
the problem is: i have to use a low-pass filter (if it matters:
digital, must run on a 32-bit machine using only integers)
right now i'm using a 4-pole butterworth; experimenting a bit i see,
with a cutoff frequency around 100 hz, a delay of about 0.008 secs,
which i would like to make shorter.
i'm no filter expert and basically i don't know where to go; i was
lurking this group with ggroups and if i understand correctly there's
some relation between group delay and filter response sharpness.
what can i do (change type or form of the filter, ...) to have a filter
with short delays and (lower priority if i have to choose....) have a
sharp response?
i would like to know if i have some grade of freedom besides lowering
the pole count....
thank you a lot
gst (novice)