Jon Elson wrote:
>Lorenzo Marcantonio wrote:
>
>
>>On Tue, 6 Nov 2007, Mario. wrote:
>>
>>
>>>not want do only do 'some' filtering, ideally we want exact
>>>counterfilter for our aches. And we need someone with good math skills
>>>to show us precisely how.
>>>
>>>
>It is already there, called biquad.comp in the HAL components,
>provided by Peter Vavaroutsos. I have to figure out the best
>filter parameters to use, but the code is already part of EMC2.
>
>
And if that wasn't easy enough, here's more or less all you need to do a
two-tap FIR (or IIR - I don't remember) filter using comp (untested):
component filter2 "2-tap filter";
pin in float in;
pin out float out "The sum of two samples * their respective coefficients";
param rw float coeff1 = 1.0 "Coefficient of the most recent sample. The
other coefficient is 1-coeff1"
variable float old;
function _;
license "GPL";
;;
FUNCTION(_) {
float temp = in;
out = temp * coeff1 + old * (1-coeff1);
old = temp;
}
Add taps as necessary, plus things like limits on the coefficient(s),
etc. :)
- Steve
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