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filter.doc
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1986-12-27
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640b
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13 lines
THE FOUR FILES FILDES,FILPLT,FILSYP & FILTRP ARE ALL PART OF A
FILTER DESIGN PROGRAM WRITTEN BY TIM REGAN OF NATIONAL SEMICONDUCTOR
CORP. THEY DESIGN LP,HP,BP & NOTCH FILTERS. THEY USE BUTERWORTH,
CHEB. & ELLIPTIC FUNCTIONS. FROM THE FILTER SPECIFICATIONS THE ORDER
CAN BE FOUND. THE POLE & ZERO FREQUENCIES AND Q'S ARE THEN FOUND. THE
RESPONSE MAY BE CALCULATED FOR EITHER A LINEAR OR LOG FREQ. SCALE.
THE PROGRAM IS RUN BY TYPING: FILDES
THE 3 OTHER PROGRAMS ARE CALLED FROM FILDES.
G. HARRISON
12/28/86