Hybrid form digital filter

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36472416, G06F 1531

Patent

active

050899813

ABSTRACT:
A hybrid form digital filter. A digital filter is provided wherein the zeros of its transfer function are provided by a direct form digital filter portion and the poles of the transfer function are provided by a normal form digital filter portion. The hybrid filter provides truncation noise and stability characteristics like those of a normal form digital filter, but its filter coefficients may be calculated more rapidly than those for a normal form digital filter having the same transfer function, thereby enabling the coefficients to be calculated in real time for tuning the filter. While the preferred embodiment is a second order hybrid digital filter, the same principles are applicable to higher order digital filters as well.

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Roberts et al., Digital Signal Processing Addison-Wesley, 1987, pp. 72-74 & 396-398.

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