Bilinear transform: introduction (#0000)
Channel: Digital Signal Processing
Date: 25/11/2013

The problem with the impulse invariance / matched z method is that they map frequencies from analogue linearly. This means that the mapping works only up to Nyquist but not to infinity. The bilinear transform fixes this problem. It's linear for lower frequencies but then becomes non-linear to compress the whole analogue frequency range into the digital one.