If s=σ+jΩ and z=re^jω, then what is the condition on σ if r<1?
(a) σ > 0
(b) σ < 0
(c) σ > 1
(d) σ < 1
I have been asked this question in an interview.
I'd like to ask this question from Bilinear Transformations in chapter Digital Filters Design of Digital Signal Processing