puredata-core 0.47.1-3 / usr / share / puredata / doc / 7.stuff / tools / latency.pd

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#X text 317 17 latency measurement;
#N canvas 31 48 928 842 guts 0;
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#X obj 628 112 == 6;
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#X obj 753 115 == 8;
#X obj 46 34 loadbang;
#X obj 59 153 r inchannel;
#X msg 59 177 set \$1;
#X obj 59 201 s inchannel-set;
#N canvas 0 22 450 300 (subpatch) 0;
#X array pulse 120 float 3;
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#X connect 95 0 76 0;
#X restore 595 387 pd guts;
#X floatatom 242 50 4 1 8 0 inchannel inchannel-set inchannel;
#X floatatom 626 267 6 0 0 0 - latency -;
#X text 108 96 adjust gain here:;
#X text 432 267 latency in milliseconds;
#X text 571 245 THE ANSWER IS:;
#X floatatom 528 143 4 0 0 0 - adc-db -;
#X floatatom 527 92 4 0 0 0 - dac-db -;
#X text 567 142 RMS amplitude in;
#X text 564 93 RMS amplitude out;
#X text 106 142 so that RMS amplitude in is between 60 and 70;
#X text 108 121 (typically between -20 and 20);
#X text 497 466 updated for Pd version 0.43;
#X obj 228 259 bng 25 250 50 0 empty discontinuity empty 17 7 0 10
-262144 -1 -1;
#X text 40 235 discontinuity: this flashes if there are audio errors
;
#X text 67 343 To use this patch \, connect your audio output back
to the audio input (any input and output channel from 1 to 8 \, but
the input channel should agree wih the "inchannel" control at top).
Then adjust gain so that "RMS amplitude in" is about 65 (anywhere from
60 to 70 will do.) The latency is measured once per second. If there
are interruptions in the audio the button above should flash (whether
or not the audio system reports the error).;