revised help docs that conform to the PDDP template

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+#X text 12 105 PLATFORM windows macosx gnulinux;
+#X text 12 185 LIBRARY internal;
+#X text 12 225 WEBSITE http://crca.ucsd.edu/~msp/;
+#X text 12 65 LICENSE SIBSD;
+#X text 12 205 AUTHOR Miller Puckette;
+#X text 12 285 HELP_PATCH_AUTHORS Updated for Pd version-0.38. Jonathan
+Wilkes revised the patch to conform to the PDDP template for Pd version
+0.42.;
+#X text 12 5 GENRE help;
+#X text 12 45 KEYWORDS signal filter;
+#X text 12 85 DESCRIPTION real one-zero (non-recursive) "reverse" filter
+\, raw;
+#X text 12 25 NAME rzero_rev~;
+#X text 12 125 INLET_0 signal clear set;
+#X text 12 145 INLET_1 float signal;
+#X text 12 165 OUTLET_0 signal;
+#X text 12 245 RELEASE_DATE 1997;
+#X text 12 265 RELEASE_VERSION;
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+#X text 98 418 float;
+#X obj 459 3 rzero_rev~;
+#X obj 431 20 pddp/pddplink http://wiki.puredata.info/en/rzero_rev~
+-text pdpedia: rzero_rev~;
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+#X msg 230 138 clear;
+#X msg 232 164 set 1;
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+#X text 11 23 real one-zero (non-recursive) "reverse" filter \, raw
+;
+#X text 98 343 signal;
+#X text 98 363 clear;
+#X text 98 393 set;
+#X text 168 363 - clear internal state to zero.;
+#X text 168 343 - the incoming signal to be filtered.;
+#X text 168 393 - set internal state.;
+#X text 167 418 - filter coefficient.;
+#X text 167 438 - filter coefficient.;
+#X text 98 473 signal;
+#X text 168 473 - the outgoing \, filtered signal.;
+#X text 80 520 1) float;
+#X text 167 520 - (optional) initializes the filter coefficient.;
+#X text 69 49 [rzero_rev~] filters an audio signal (left inlet) via
+a one-zero real filter \, whose coefficient is controlled by a creation
+argument or by an audio signal (right inlet). The impulse response
+is that of "rzero" reversed in time.;
+#N canvas 27 280 428 309 Related_objects 0;
+#X obj 74 60 rzero~;
+#X obj 25 80 cpole~;
+#X obj 25 60 rpole~;
+#X obj 123 60 rzero_rev~;
+#X obj 74 80 czero~;
+#X obj 123 80 czero_rev~;
+#X text 201 60 real;
+#X text 200 81 complex;
+#X text 22 44 1-pole;
+#X text 71 44 1-zero;
+#X text 121 44 1-zero \, reversed;
+#X text 47 29 summary of raw filters:;
+#X text 18 184 User-friendly Filters;
+#X obj 21 213 lop~;
+#X obj 72 212 hip~;
+#X obj 124 213 bp~;
+#X obj 169 214 vcf~;
+#X obj 22 274 biquad~;
+#X text 18 250 Other Objects;
+#X text 18 113 Pd also provides a suite of user-friendly filters. This
+and other raw filters are provided for situations which the user-friendly
+ones can't handle. See Chapter 8 of http://crca.ucsd.edu/~msp/techniques
+for an introduction to the necessary theory.;
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+#X text 80 18 Stuff to test it:;
+#X obj 76 168 rzero_rev~;
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+#X text 70 281 where y[n] is the output \, x[n] the input \, and a[n]
+the filter coefficient. The filter is always stable.;
+#X text 126 261 y[n] = -a[n] * x[n] + x[n-1];
+#X text 70 312 The transfer function is H(Z) = -a + Z^-1.;
+#X text 69 240 The action of [rzero_rev~] is:;
+#X obj 4 597 pddp/pddplink pddp/help.pd -text help;
+#X obj 455 51 pddp/dsp-reminder;
+#X obj 99 572 pddp/pddplink ../3.audio.examples/H14.all.pass.pd -text
+doc/3.audio.examples/H14.all.pass.pd;
+#X text 98 438 signal;
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