Truncated orthogonal expansions of recurrent signals: equivalence to a periodic time-variant filter


In this work we show that orthogonal expansions of recurrent signals like electrocardiograms with a reduced number of coefficients can be considered as a periodic time-variant filter. Instantaneous impulse and frequency responses are analyzed for two cases: estimation of the coefficients with inner product and adaptive estimation with LMS algorithm. 
DOI: 10.1109/ICASSP.1998.681787


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