A First Experimental Study of Fixed-Point Approximate Arithmetic in Recursive Lattice Filters
Peter Koch,
Yannick Le Moullec
Abstract:In some situations, the numerical properties of Direct Form I (DF-I) and Direct Form II (DF-II) Infinite Impulse Response (IIR) filter structures may degrade, e.g., when the filter approaches its stability limit. Other filter structures may be numerically more robust under such conditions. For example, an N th order Lattice filter composed of N structurally identical cascaded feed-forward sections can be extended and made recursive, i.e., Lattice IIR filter, thereby implementing zeros as well as poles. Such fi… Show more
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