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Fri Jan 14 15:44:14 EST 2011

## Factored FIR

Q: Are there any FIR filter design algorithms that explicitly rely on
the equation to be in factored-out form, i.e. as a product of 2nd
order sections?
I suppose this introduces the problem of having to specify whether FIR
zeros are complex or not. I seem to remember them mostly being
complex, exept for odd orders where there would be one zero.
Q: Is there a reason why FIR filters have "mostly complex" zeros?
Is this equivalent to asking why their inverses the IIR all-pole
filters have "mostly complex" poles? (Because that gives more
locality.)

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