What is the expression for the digital frequency when r=1?
(a) \(\frac{1}{T} tan(\frac{ΩT}{2})\)
(b) \(\frac{2}{T} tan(\frac{ΩT}{2})\)
(c) \(\frac{1}{T} tan^{-1}(\frac{ΩT}{2})\)
(d) \(\frac{2}{T} tan^{-1}(\frac{ΩT}{2})\)
The question was posed to me during an online interview.
The question is from Bilinear Transformations topic in chapter Digital Filters Design of Digital Signal Processing