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#X text 12 105 LIBRARY internal;
#X text 12 145 WEBSITE http://crca.ucsd.edu/~msp/;
#X text 12 25 LICENSE SIBSD;
#X text 12 125 AUTHOR Miller Puckette;
#X text 12 185 HELP_PATCH_AUTHORS Updated for Pd version-0.30. Jonathan
Wilkes revised the patch to conform to the PDDP template for Pd version
0.42.;
#X text 12 5 KEYWORDS signal filters;
#X text 12 45 DESCRIPTION 2-pole-2-zero-filter;
#X text 12 85 OUTLET_0 signal;
#X text 12 65 INLET_0 list signal set clear;
#X text 12 165 RELEASE_DATE 2009;
#X restore 500 597 pd META;
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#X text 7 1 [biquad~] Related Objects;
#X restore 101 597 pd Related_objects;
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#X msg 155 99 1.41407 -0.9998 1 -1.41421 1;
#X text 220 237 (= SR/8 = 5512.5 Hz @44.1k);
#X text 167 77 list sets filter parameters;
#X msg 190 129 set 0 0;
#X msg 191 154 clear;
#X obj 66 138 osc~ 5512.5;
#X text 260 131 set internal state;
#X text 258 153 ... or just clear it;
#X text 98 350 list;
#X text 98 330 signal;
#X text 98 370 set;
#X text 98 390 clear;
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#X text 98 426 signal;
#X text 169 503 y(n) = ff1 * w(n) + ff2 * w(n-1) + ff3 * w(n-2);
#X text 169 519 w(n) = x(n) + fb1 * w(n-1) + fb2 * w(n-2);
#X text 169 541 Syntax: biquad~ fb1 fb2 ff1 ff2 ff3;
#X text 59 267 Compare the value of the straight signal on the left
with the value of the filtered signal on the right.;
#X text 11 23 2-pole-2-zero-filter;
#X text 169 472 - [biquad~] takes five floats as arguments which are
used to calculate the following difference equation:;
#X text 168 370 - set internal state.;
#X text 168 390 - clear the internal state.;
#X text 85 472 5 floats;
#X text 214 218 this [biquad~] is a notch filter for fn = Pi/4;
#X text 168 350 - a list of 5 floats is used to set filter parameters.
;
#X text 168 330 - the incoming signal;
#X text 168 426 - the outgoing signal;
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