Re: Basic info needed regarding filters (FIR)


"John Larkin" <jjlarkin@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx> wrote in message
news:ngkek35vfm4oob6slhsh0nrs2bm5dma4jk@xxxxxxxxxx
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.

McDonalds serves somewhat 10 billion meals per year. But this fact doesn't
make those meals taste any better or worse :)

So why is it not a good idea? Why so dogmatic?
More important, my filter has comments and yours doesn't.

I am sorry if you didn't understand 3 lines of trivial C code without
comments. It would be a good idea to do some learning before suggesting the
advanced digital filter topologies...

VLV


.

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