Tuesday, August 27, 2019

infinite impulse response - IIR filters with variable roll-off


I have a filter design problem in which lowpass filters have to be designed with varying roll-off. E.g: 2.7 db/ocatve or 1.4 db/ocave. See picture below.


This is easy to achieve with a FIR filter, yet its computational cost is too large. Therefore, if at all possible, I would like to do this with an IIR filter. Sadly, most IIR filters have multiples of 6dB/octave rolloff.



enter image description here




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