From 65a1b98552d7c6a93aedfb7c9b5d83f9038227cb Mon Sep 17 00:00:00 2001 From: Miller Puckette Date: Sat, 31 Dec 2005 00:59:49 +0000 Subject: Added about 64 files that I hadn't realized weren't in the CVS repository. Threw in pd/portaudio/pa_win_wdmks for good measure, although I haven't tried compiling that in yet (no windoze machine handy today). svn path=/trunk/; revision=4316 --- pd/doc/3.audio.examples/I02.Hann.window.pd | 181 +++++++++++++++++++++++++++++ 1 file changed, 181 insertions(+) create mode 100644 pd/doc/3.audio.examples/I02.Hann.window.pd (limited to 'pd/doc/3.audio.examples/I02.Hann.window.pd') diff --git a/pd/doc/3.audio.examples/I02.Hann.window.pd b/pd/doc/3.audio.examples/I02.Hann.window.pd new file mode 100644 index 00000000..1cf8b46a --- /dev/null +++ b/pd/doc/3.audio.examples/I02.Hann.window.pd @@ -0,0 +1,181 @@ +#N canvas 281 223 567 589 12; +#N canvas 228 148 651 544 fft-analysis 0; +#X obj 15 164 *~; +#X obj 14 99 inlet~; +#X obj 15 218 rfft~; +#X obj 36 140 tabreceive~ \$0-hann; +#X obj 14 306 *~; +#X obj 56 306 *~; +#X obj 15 356 sqrt~; +#X obj 14 498 tabwrite~ \$0-magnitude; +#X obj 23 386 loadbang; +#X obj 23 470 metro 250; +#X obj 23 449 tgl 15 0 empty empty empty 0 -6 0 8 -262144 -1 -1 1 1 +; +#X msg 31 411 \; pd dsp 1; +#X obj 15 8 block~ 512; +#X text 225 131 tabreceive~ outputs array contents \,; +#X text 225 149 constantly \, every block. Here it's; +#X text 223 169 used to get the Hann window to; +#X text 225 187 multiply by the input.; +#X text 120 7 block~ object does no computation but declares this; +#X text 120 24 window to be operating at a different block size from +; +#X text 122 58 Fourier transform.; +#X text 121 40 the parent window. This determines the size of the; +#X text 76 99 The inlet~ automatically re-blocks to the new block size. +; +#X obj 15 332 +~; +#X text 94 308 Take the magnitude by squaring real and imaginary part +\, adding and taking square root.; +#X text 110 424 periodically graph the output. It appears every 512 +samples (about 12 milliseconds) but we only update the graph 4 times +per second. The graph is back on the main (parent) window.; +#X text 82 215 forward real FFT. Like "fft~" \, but only one inlet +(for the real part) and only the first half of the output signals are +used. (The others are determined by symmetry: they're complex conjugates +of the first half \, in reverse order.) 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8 -262144 -1 +-1; +#X text 321 373 Hann window; +#X text 98 462 period 512; +#X text 40 368 recalculate Hann; +#X text 75 383 window table; +#X text 100 233 tens of Hz.; +#X text 80 215 <- frequency \,; +#X text 98 270 click here and; +#X text 170 286 <- see; +#X text 21 32 In this example we use a sub-patch ("pd fft-analysis") +to re-block the Fourier transform to 512 points. The signal is multiplied +by the Hann window function (which is just a raised cosine.) The magnitude +\, which is computed in the sub-patch \, is graphed below in this window. +The point at 255 corresponds to just below the Nyquist frequency. Phase +isn't shown \, and unlike the previous patch we don't control the initial +phase of the oscillator. (For fun \, try drawing other window functions +with the mouse...); +#X text 459 527 511; +#X connect 3 0 0 0; +#X connect 4 0 5 0; +#X connect 5 0 3 0; +#X connect 14 0 15 1; +#X connect 15 0 17 0; +#X connect 16 0 23 0; +#X connect 17 0 18 0; +#X connect 18 0 19 0; +#X connect 23 0 15 0; +#X connect 24 0 16 0; +#X connect 24 0 14 0; +#X connect 24 0 19 0; -- cgit v1.2.1