From: "PicDude"
> Finally got around to implementing/trying some proportional filtering [
> N=N+(N-L)*K ] in one of my pieces of PIC code (which is essentially a
> frequency counter).  This thing is sweet!  I've experimented with K=1/4,
1/2,
> and 3/4.  For my app, 3/4 works well (but I still have a bit of averaging
in
> there still, since I'm experimenting with combinations of averaging and
> proportional filtering).
>
<snip>

Out of curiosity... if you have a PID, wouldn't you have three constants
(Kp, Ki, Kd)?

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