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US 4,356,558 AGranted
Optimum second order digital filter
AssigneeMartin Marietta Corporation
InventorsWilliam J. Owen, Robert A. Booker
Life of this patent
Estimating the term…
Abstract
A second order digital filter utilizing six processor operations, two add instructions, two shift instructions and two store instructions. No multipliers are required. The filter is used as a digital filter in a servo loop having a Z transform of, G(Z)=4 (1-Z.sup.-1)+Z.sup.-2.
Claims5
A second order digital filter comprising:
- a first delay element receiving an input signal r(n);
- a first summing means receiving the signal r(n) and the output of said first delay element, and producing a summed output;
- shift register means receiving the output of said first summing means and shifting the summed output a predetermined number of places;
- a second delay element coupled to said first delay element, and;
- a second summing means receiving the outputs from said shift register and said second delay element and producing a compensated output c(n), where .gradient..sup.2 c(n)=r(n)+k.sub.1 (r(n)-r(n-1))+k.sub.2 ((r(n)-r(n-1))-(r(n-1)-r(n-2)), wherein:
- k.sub.1 and k.sub.2 are binary scalars, r(n) is the latest input sample, r(n-1) is the prior sample, r(n-2) is the second prior sample.
3 more elements
Dependencies are inferred from the claim text.