IIR digital filtering of non-uniformly sampled signals via state representation

Eigenvalues of five discretizations of a Chebyshev filter


This article describes a new kind of processing chain based on a non-uniform sampling scheme provided by a level-crossing ADC. The chain implements IIR filters which process directly the non-uniform samples without resampling in a regular scheme. The non-uniformity in the sample times leads to choose a state representation for the filters. The stability is studied and the performances of various numerical schemes used to implement the filters in this representation are compared.

Signal Processing, 90(10), 2811–2821 (2010)