On Tue, Sep 24, 2013 at 3:08 PM, Funs Seelen <[email protected]> wrote:
> On Tue, Sep 24, 2013 at 2:50 PM, Alexandre Torres Porres <[email protected] > > wrote: > >> one doubt emerges really soon anyway. Since they are complex (there are >> two coordinate numbers for each pole and zero) how do I get only one number >> by, for example, summing or multiplying one pole to the other? as in: >> >> *b1* = -(P0 + P1) >> *b2* = (P0*P1) >> > > You don't, the coefficients can be complex too. However, I discovered that > mirroring (*) every pole and zero results in just real values without > imaginary part. I don't have any mathematical proof for this, but it > probably wouldn't be too hard to find such. > I remembered again, it's called the complex conjugate. http://en.wikipedia.org/wiki/Complex_conjugate > > *) adding another pole/zero for each complex one, like z=-j if you already > have a z=j. >
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