Hi all.
First of all, sorry for not being subscribed to the list.
I found a problem with the signal-1.0.11 package: for example:
octave:45> [b, a]=besself(4, 0.01, "low")
b = 1.0000e-08
a =
1.0000e+00 3.1239e-02 4.3916e-04 3.2011e-06 1.0000e-08
...and the correct coefficients should be (I calculated them with the page
http://www-users.cs.york.ac.uk/~fisher/mkfilter/trad.html)
b=[1 4 6 4 1]/3.362734455e+06;
a=[1 -3.8525052595 5.5672342595 -3.5766230918 0.8618988499]
I checked the filter output and seems to me that the second set of
coefficients are the correct ones.
Hope this helps,
Romano Giannetti
PD if you can Cc: me, thanks. Otherwise I will check on the list archive...
Thanks!
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