Update of /cvsroot/pure-data/doc/tutorials/sound In directory sc8-pr-cvs1.sourceforge.net:/tmp/cvs-serv8868

Modified Files: 01.hello_world.pd 02.audio_data.pd Added Files: 03.dsp_processing.pd TEMPLATE.pd TODO amplitude_modulation.pd crossfade.pd detecting_pitch.pd ramping_up_and_down.pd voice_fm.pd Log Message: lots of sketches, not ordered yet

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Helvetica ? 0 0 0 0 When you "modulate" the amplitude of a waveform using another waveform , this is called AM synthesis. AM stands for Amplitude Modulation.; #X obj 36 159 hsl 150 20 50 500 0 1 empty empty carrier_frequency 10 10 1 12 -262131 -1 -1 6622 0; #X obj 78 258 hsl 150 20 1 50 0 1 empty empty modulating_frequency 10 10 1 12 -228992 -1 -1 2737 0; #X obj 73 287 osc~; #X obj 73 184 nbx 5 14 -1e+37 1e+37 0 0 empty empty empty 0 -6 1 14 -195568 -1 -1 249.993 256; #X obj 113 288 nbx 5 14 -1e+37 1e+37 0 0 empty empty empty 0 -6 1 14 -195568 -1 -1 10.0009 256; #X obj 34 187 osc~; #X obj 59 226 comment 200 12 Helvetica ? 0 0 0 0 The "modulating frequency" changes the quality of the sound.; #X obj 196 406 tabwrite~ $0-wavetable; #X connect 2 0 20 0; #X connect 3 0 2 0; #X connect 4 0 0 0; #X connect 4 0 0 1; #X connect 5 0 4 1; #X connect 10 0 4 0; #X connect 10 0 20 0; #X connect 13 0 16 0; #X connect 13 0 18 0; #X connect 14 0 15 0; #X connect 14 0 17 0; #X connect 15 0 10 1; #X connect 18 0 10 0;

--- NEW FILE: detecting_pitch.pd --- #N canvas 163 297 636 456 10; #X obj 541 21 pddp/dsp; #X obj 11 8 cnv 15 400 40 empty empty detecting_pitch 20 12 0 24 -228992 -66577 0; #X obj 119 176 fiddle~; #X text 28 121 Now its time to be the fool and start singing into the mic!; #X obj 119 148 adc~; #X obj 133 223 bng 15 250 50 0 empty empty empty 0 -6 0 8 -262144 -1 -1; #X text 152 223 <-- banged on attack; #X obj 163 197 - 100; #X obj 118 267 mtof; #X obj 516 59 import rradical; #X obj 124 361 ezdac~; #X obj 147 330 *~; #X obj 118 287 osc~; #X obj 180 263 mavg 200; #X obj 164 286 -; #X obj 164 306 / 100; #X connect 2 0 8 0; #X connect 2 1 5 0; #X connect 2 3 7 0; #X connect 4 0 2 0; #X connect 4 1 2 0; #X connect 7 0 13 0; #X connect 7 0 14 0; #X connect 8 0 12 0; #X connect 11 0 10 0; #X connect 11 0 10 1; #X connect 12 0 11 0; #X connect 13 0 14 1; #X connect 14 0 15 0; #X connect 15 0 11 1;

--- NEW FILE: TEMPLATE.pd --- #N canvas 286 169 640 460 10; #X obj 541 21 pddp/dsp; #X obj 11 8 cnv 15 400 40 empty empty TEMPLATE 20 12 0 24 -228992 -66577 0; #X obj 151 364 ezdac~; #X obj 494 57 import rradical;

--- NEW FILE: 03.dsp_processing.pd --- #N canvas 406 233 640 460 10; #X obj 466 72 import pddp rradical; #X obj 541 21 pddp/dsp; #X obj 11 8 cnv 15 400 40 empty empty dsp_processing 20 12 0 24 -228992 -66577 0; #X text 13 69 Unlike message processing , which is always running , audio processing can be switched on and off. This is also known as "DSP" or Digital Signal Processing.; #X text 12 122 There are many ways to control the DSP: There is a checkbox in the Pd window ; you can send Pd a dsp message ; there are key commands ; and there are high-level objects , like [pddp/dsp].; #X text 15 189 The dsp message:; #X msg 28 238 ; pd dsp 0; #X msg 119 238 ; pd dsp 1; #X text 34 218 off (0); #X text 123 217 on (1); #X msg 218 238 ; pd dsp $1; #X obj 218 214 tgl 15 0 empty empty empty 0 -6 0 8 -262144 -1 -1 0 1; #X text 243 213 use a toggle; #X text 355 209 receive the message; #X obj 357 227 receive pd; #X obj 357 248 route dsp; #X obj 357 269 tgl 15 0 empty empty empty 0 -6 0 8 -262144 -1 -1 0 1; #X text 22 303 Key commands:; #X text 57 328 GNU/Linux and Windows:; #X text 148 314 Mac OS X:; #X text 227 299 (off); #X text 328 300 (on); #X text 224 328 Ctrl-.; #X text 224 314 Cmd-.; #X text 324 328 Ctrl-/; #X text 324 314 Cmd-/; #X text 21 361 Objects:; #X text 55 383 [pddp/dsp]; #X obj 132 383 pddp/dsp; #X obj 331 383 ezdac~; #X text 208 383 [rradical/ezdac~]; #X connect 11 0 10 0; #X connect 14 0 15 0; #X connect 15 0 16 0;

Index: 01.hello_world.pd =================================================================== RCS file: /cvsroot/pure-data/doc/tutorials/sound/01.hello_world.pd,v retrieving revision 1.1 retrieving revision 1.2 diff -C2 -d -r1.1 -r1.2 *** 01.hello_world.pd 7 Apr 2006 05:22:42 -0000 1.1 --- 01.hello_world.pd 11 Apr 2006 02:26:36 -0000 1.2 *************** *** 4,21 **** #X obj 8 10 cnv 15 400 40 empty empty hello_world 20 12 0 24 -228992 -66577 0; ! #X obj 198 136 comment 400 14 Helvetica ? 0 0 0 0 2 create an object ! called: osc~; ! #X obj 198 106 comment 400 14 Helvetica ? 0 0 0 0 1 create a message ! box with the text: 200; ! #X obj 198 166 comment 400 14 Helvetica ? 0 0 0 0 3 create an object ! called: dac~; ! #X obj 198 196 comment 400 14 Helvetica ? 0 0 0 0 4 connect the message box to the osc~ object's left inlet; ! #X obj 198 226 comment 400 14 Helvetica ? 0 0 0 0 5 connect the osc~ object to both inlets of the dac~ object; ! #X obj 198 256 comment 400 14 Helvetica ? 0 0 0 0 6 make sure your ! volume is set very low; ! #X obj 198 286 comment 400 14 Helvetica ? 0 0 0 0 7 turn on DSP by clicking the box on the upper right corner; ! #X obj 198 316 comment 400 14 Helvetica ? 0 0 0 0 8 click the message box to hear sound; --- 4,17 ---- #X obj 8 10 cnv 15 400 40 empty empty hello_world 20 12 0 24 -228992 -66577 0; ! #X text 198 136 2 create an object called: osc~; ! #X text 198 106 1 create a message box with the text: 200; ! #X text 198 166 3 create an object called: dac~; ! #X text 198 196 4 connect the message box to the osc~ object's left inlet; ! #X text 198 226 5 connect the osc~ object to both inlets of the dac~ object; ! #X text 198 256 6 make sure your volume is set very low; ! #X text 198 286 7 turn on DSP by clicking the box on the upper right corner; ! #X text 198 316 8 click the message box to hear sound;

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--- NEW FILE: TODO ---

- replace [comment] with #X text

- wavetable - link to playnow/draw_sound

- Load a sound file (high-level, no tables, no soundfiler)

- Play sound file back with phasor~?

- Scrub sound file with numberbox

- Create sound (high-level FM abstraction?)

- Change sound quality with numberbox

File Order:

- hello world quick sine wave patch - audio data differences between audio and message data - dsp processing controlling the DSP - oscillators [osc~], [cos~], [phasor~] - amplitude modulation super simple AM - AM synthesis nice AM example - frequency modulation - FM synthesis (80's keyboard sound!) - click graph click and play it a click contains all frequencies - ramping up and down [line~], [line] - 3.audio.examples/A04.line2.pd - filtering removing audio by frequency working in the frequency domain rather than amplitude - filter types lowpass, highpass, bandpass, bandreject/notch - filter order - filter shapes - resonant frequency - filter Q - equalizer - reverb (rev1, rev2, freeverb~) - feedback delay network reverb (fbn~) - convolution reverb (partconv~)

digital audio tutorial - digital audio samples represent the amplitude at the slice of time - aliasing - the samples

Index: 02.audio_data.pd =================================================================== RCS file: /cvsroot/pure-data/doc/tutorials/sound/02.audio_data.pd,v retrieving revision 1.1 retrieving revision 1.2 diff -C2 -d -r1.1 -r1.2 *** 02.audio_data.pd 7 Apr 2006 05:22:42 -0000 1.1 --- 02.audio_data.pd 11 Apr 2006 02:26:36 -0000 1.2 *************** *** 1,3 **** ! #N canvas 15 58 624 444 10; #X obj 292 20 import cyclone; #X obj 236 244 *~; --- 1,3 ---- ! #N canvas 393 46 628 448 10; #X obj 292 20 import cyclone; #X obj 236 244 *~; *************** *** 11,23 **** #X obj 533 20 pddp/dsp; #X text 62 373 TODO: find out how to type ~ on various keyboards; - #X obj 29 68 comment 400 12 Helvetica ? 0 0 0 0 For audio , Pd has - a specific data type. It is represented by tilde ("~") objects and - thick cords.; - #X obj 87 168 comment 200 12 Helvetica ? 0 0 0 0 messages (thin cord) - -->; - #X obj 116 266 comment 200 12 Helvetica ? 0 0 0 0 audio (thick cord) - -->; #X obj 8 10 cnv 15 400 40 empty empty audio_data 20 12 0 24 -228992 -66577 0; #X connect 1 0 4 0; #X connect 1 0 4 1; --- 11,20 ---- #X obj 533 20 pddp/dsp; #X text 62 373 TODO: find out how to type ~ on various keyboards; #X obj 8 10 cnv 15 400 40 empty empty audio_data 20 12 0 24 -228992 -66577 0; + #X text 75 265 audio (thick cord) -->; + #X text 49 164 messages (thin cord) -->; + #X text 14 70 For audio , pd has a specific data type. Audio objects + all have a trailing tilde ("~"). Audio coords are thick.; #X connect 1 0 4 0; #X connect 1 0 4 1;