I have designed an inverse IIR high pass filter by inverting its transfer function B(z)/A(z) to A(z)/B(z). However, the inverse filter has a pole at z=-1.
Is this filter considered stable (marginally stable) or unstable since Matlab says it is not stable ?
in that case, how can i design such a digital filter so that it is stable and gives me the same response as expected, because when i try to enter the pole within the unit circle, the Amplitude response does not turn out the way i want it to. thanks in Advance.