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'[PIC]:Digital filtering using a PIC'
2001\08\13@080005 by antoniasse

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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    Luís Fernando

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2001\08\13@082734 by Ing. Gustavo Quilosa

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Yeap ... it's possible....
.... try with the IIR filters algorithms of the embedded handbook.

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Ing. G. Quilosa
Development Dept.
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----- Mensaje original -----
De: antoniasse <.....antoniasseKILLspamspam@spam@BRAILE.COM.BR>
Para: <PICLISTspamKILLspamMITVMA.MIT.EDU>
Enviado: lunes 13 de agosto de 2001 9:01
Asunto: [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

Lums Fernando

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2001\08\13@121421 by Harald Milz

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In article <001f01c123f4$6bb91a90$0101a8c0@desarrollo01>, Ing. Gustavo Quilosa <quilosabespamspam_OUTyahoo.com> wrote:
> Yeap ... it's possible....
> .... try with the IIR filters algorithms of the embedded handbook.

Doesn't that depend on the signal's sample rate?

> De: antoniasse <@spam@antoniasseKILLspamspamBRAILE.COM.BR>

> I'm looking for way to do
> 60Hz BAND-PASS FILTER and
> 60Hz NOTCH FILTER using a PIC.

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2001\08\13@131318 by t F. Touchton

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part 1 1641 bytes content-type:text/plain; charset=us-ascii
for 60Hz notch... sample at an even harmonic frequency and average the
result.

Scott F. Touchton
1550 Engineering Manager
JDS Uniphase



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In article <001f01c123f4$6bb91a90$0101a8c0@desarrollo01>, Ing. Gustavo
Quilosa <TakeThisOuTquilosabeEraseMEspamspam_OUTyahoo.com> wrote:
> Yeap ... it's possible....
> .... try with the IIR filters algorithms of the embedded handbook.

Doesn't that depend on the signal's sample rate?

> De: antoniasse <RemoveMEantoniassespamTakeThisOuTBRAILE.COM.BR>

> I'm looking for way to do
> 60Hz BAND-PASS FILTER and
> 60Hz NOTCH FILTER using a PIC.

--
Harald Milz           |     hmEraseMEspam.....linux-magazin.de     | If a messy desk
stands
Linux New Media AG    | phone  +49 (0) 89 993411-20 | for a messy mind,
what
Stefan-George-Ring 24 | fax    +49 (0) 89 993411-99 | does an empty desk
D-81929 Muenchen      | http://www.linux-magazin.de | stand for ?

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part 2 3178 bytes content-type:application/octet-stream; (decode)

part 3 136 bytes
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2001\08\13@133616 by Saurabh Sinha

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Hey Luis,

We did somehting similar, you can have a look at my webpage. Look under
filters, there's some files that may help (FIR implemenetaion, but should
give an idea).

(Though, I must say I dont think you really need to do this on a PIC!)

Regards,

S. Sinha (Saurabh)
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2001\08\13@143143 by Scott Dattalo

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On Mon, 13 Aug 2001, Scott F. Touchton wrote:

>
> for 60Hz notch... sample at an even harmonic frequency and average the
> result.
>

With the added benefit that you'll notch 30Hz, 15Hz, 7.5Hz, ...
and in general 60/N Hz, including when N -> inifinity. In other words,
you'll filter DC too!

I'm not sure of the application, but you'll probably want to filter
60Hz by integrating over 1/60'th of a second time interval. For
example, if you had a voltage to frequency converter as your A/D then
you can count the pulses it emits for 16.6666 mSec. Or if you have a
successive approximation A2D, then you could synchronously sample say
60*16 times per second and average the last 16 samples (add them
together and then shift right 4) to get a representation of the
signal minus 60Hz. Note that both of these suggestions are really low
pass filters with a notch at 60Hz and not Notch filters per-se.

Scott

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2001\08\13@213330 by Tom Mariner

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Hello Luis,

Absolutely possible. We did a full elliptical filter on a processor with 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 determine
coefficients and algorithms, then determined sampling rates that would 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 values
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 fast drop
off.

Tom

> {Original Message removed}

2001\08\14@073459 by Vasile Surducan
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Sinha, you have a very nice theory here !  Just downloaded.
Cheers, Vasile


On Mon, 13 Aug 2001, Saurabh Sinha wrote:

{Quote hidden}

> {Original Message removed}

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