Hello Luis,

Absolutely possible. We did a full elliptical filter on a processor w=
ith 20%
of the Pic's power to filter flourescent light from an IR signal. You
obviously already have the problem well in hand since you are dealing=
 with a
slow frequency. We used a commercial filter design package to determi=
ne
coefficients and algorithms, then determined sampling rates that woul=
d a) be
amenable to fixed point processing and b) allow some of the terms to =
drop
out. Since most of the filtering work is done by multiplying finite v=
alues
by trig functions, we used a lookup table to accomplish the multiply =
by a
factor, then by a trig function.

The result had virtually no gain in the pass band and an extremely fa=
st drop
off.

Tom

> -----Original Message-----
> From: pic microcontroller discussion list
> [mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of antoniasse
> Sent: Monday, August 13, 2001 08:02 AM
> To: PICLIST@MITVMA.MIT.EDU
> Subject: [PIC]:Digital filtering using a PIC
>
>
> Hello for all.
>
> I'm looking for way to do
> 60Hz BAND-PASS FILTER and
> 60Hz NOTCH FILTER using a PIC.
>
> Is it possible to do this with a PIC?
>
> Have you ever seen something like this?
>
> Thanks in advanced goes any help
>
> Lu=EDs Fernando
>
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