Question

By impulse invariance method, the IIR filter will have a unit sample response h(n) that is the sampled version of the analog filter.

(a) True

(b) False

I have been asked this question in unit test.

The doubt is from IIR Filter Design by Impulse Invariance in portion Digital Filters Design of Digital Signal Processing

Answer 1

The correct choice is (a) True

The best I can explain: In the impulse invariance method, our objective is to design an IIR filter having a unit sample response h(n) that is the sampled version of the impulse response of the analog filter. That is

h(n)=h(nT); n=0,1,2…

where T is the sampling interval.