/usr/share/puredata/doc/3.audio.examples/B04.tabread4.interpolation.pd is in puredata-doc 0.47.1-3.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 | #N canvas 137 102 781 520 12;
#X graph graph1 0 -1.02 10 1.02 468 159 648 29;
#X array waveform13 11 float 1;
#A 0 1 1 1 1 1 1 1 -1 -1 -1 -1;
#X pop;
#X text 533 502 updated for Pd version 0.34;
#X obj 156 157 +~ 1;
#X text 21 81 phase;
#X text 20 96 generation -->;
#X text 25 117 range;
#X text 24 132 adjustment -->;
#X graph graph3 0 -1.02 440 1.02 469 362 769 222;
#X array wave-out13 441 float 0;
#X pop;
#X msg 177 216 bang;
#X text 223 217 <--click to graph;
#N canvas 11 418 523 216 other-stuff 0;
#X obj 41 49 loadbang;
#X msg 39 81 \; waveform13 0 1 1 1 1 1 1 1 -1 -1 -1 -1 \; waveform13
xlabel -1.2 0 1 2 3 4 5 6 7 8 9 10 \; pd dsp 1;
#X connect 0 0 1 0;
#X restore 626 426 pd other-stuff;
#X obj 156 247 tabwrite~ wave-out13;
#X obj 156 184 tabread4~ waveform13;
#X obj 156 131 *~ 8;
#X obj 156 95 phasor~ 220;
#X text 36 22 4-POINT INTERPOLATION IN DETAIL;
#X obj 216 316 sig~ 220;
#X obj 216 346 tabosc4~ waveform13;
#X text 35 293 (this would be;
#X text 36 313 equivalent to the;
#X text 110 333 above) -->;
#X text 18 409 This patch demonstrates 4-point interpolation in tabread4~.
The 11-point table \, waveform13 \, contains a transition from from
1 to -1 \, which is "smoothed" as seen in wave-out13. There's no such
transition at the wraparoind point--the interpolation always happens
between 4 consccutive samples of the table \, disregarding wraparound.
;
#X connect 2 0 12 0;
#X connect 8 0 11 0;
#X connect 12 0 11 0;
#X connect 13 0 2 0;
#X connect 14 0 13 0;
#X connect 16 0 17 0;
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