Howtosignalprocessing
- What are the characteristics of IIR filter?
- How do I know if my IIR filter is stable?
- Why are IIR filters unstable?
- What are the advantages of IIR filters?
What are the characteristics of IIR filter?
Infinite impulse response (IIR) filters are characterized by the fact that they use delayed versions of the input signal and fed-back and delayed versions of the output signal to filter the input to the output.
How do I know if my IIR filter is stable?
The stability of an IIR filter can be analyzed by the zero-pole plot of the filter's transfer function. A digital filter is stable if and only if all the poles of the irreducible filter transfer function lie inside the unit circle in the z plane.
Why are IIR filters unstable?
(a) Stable IIR filter, (b) The same IIR filter becomes unstable due to rounding effects. , one poles lie exactly on the unit circle (ie, it is just out of the region of stability) and hence it is an unstable IIR filter.
What are the advantages of IIR filters?
The advantage of IIR filters over FIR filters is that IIR filters usually require fewer coefficients to execute similar filtering operations, that IIR filters work faster, and require less memory space. The disadvantage of IIR filters is the nonlinear phase response.
