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Thanks guys.
More specifically, I will limit the filters to real coefficients ones. It is obvious that if numerator and denominator (of the IIR transfer function) are linear phase FIRs, then the resulting IIR is linear phase (I don't want to talk about stability or causality at this moment)...
Condition for a FIR filter to be linear phase is very popular, i.e. its coefficients must be symmetric or antisymmetric, but for IIR filters it's not so obvious.
Could anyone tell me what makes an IIR filter linear phase?
Thanx.
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