Re: Basic info needed regarding filters (FIR)

On Fri, 23 Nov 2007 12:43:10 -0600, Vladimir Vassilevsky
<antispam_bogus@xxxxxxxxxxx> wrote:



Here is the basic realpole filter which is simpler and appears to have
almost identical response:

const u8 order = 4;

s32 LPF(s32 x)
{
static s32 z[order];

for(u8 i = 0; i < order; i++) x = z[i]+= (x - z[i])>>6;

return x;
}

Making digital filter as the simulation of an analog filter is rarely a
good idea.


I've sold over 3000 of the temperature controllers that use this
filter. So why is it not a good idea? Why so dogmatic?

More important, my filter has comments and yours doesn't.


John


.

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