[PD] PD/max overlaping - Block~, Switch~

geiger geiger at xdv.org
Sun May 28 11:02:01 CEST 2006


On Sun, 28 May 2006, José Henrique Padovani wrote:
<clip>
> It seens that PD's [block~] and [switch~] work on second manner (see
> patch transcribed below)..

block only works in this manner with signals inside the canvas (like
the arrays you use). The reading with overlapped signals is done
in the inlets/outlets of a patch, so in order to do fft, you have to put
the block~ in a subpatch and let the signal enter via an inlet.
(The outlet recombines them). You also have to do that because you can
not put a dac~ into a patch that has a different blocksize.

Guenter

> But my question is this: To work with
> windowed signals for use with [fft~] and [rfft~] it wouldn't be better
> to overlap while reading? So I would have more spectral details because
> the windowing of the two overlaps would "cut" different informations of
> the signal...
>
> If Puckette read this message, I have a question: On Max/MSP the
> overlapig of pfft~ object works like that too? It seens to work on the
> first way... I am asking to you because I imagine that you had
> implemented it on Max.
>
> Thanks for the answers...
> J.H.
>
> PS: on the patch I had used a strange way to do the tests but it was
> useful to me...
>
>
>
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> #X restore 524 271 graph;
> #X obj 422 -26 * 2;
> #X obj 112 497 tabsend~ out;
> #X obj 114 181 sel 1;
> #X msg 422 -2 \; sin-tri-tri-sin resize \$1;
> #X obj 217 401 tabwrite~ sin-tri-tri-sin;
> #X msg 651 14 \; sub-patch resize \$1 \; out resize \$1 \;;
> #X text 22 -57 block size;
> #X text 118 -80 8;
> #X text 150 -80 16;
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> #X text 212 -80 64;
> #X text 241 -80 128;
> #X text 274 -80 256;
> #X text 305 -80 512;
> #X text 335 -80 1024;
> #X text 966 285 same period delayed gives the sum of "out"...;
> #X text 963 347 if it had a overlaping on input it should give a zeroed
> signal...;
> #X text 832 162 interchange waves on block;
> #X text 419 245 |;
> #X text 419 255 |;
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> #X text 419 365 |;
> #X text 419 375 |;
> #X text 419 385 |;
> #X text 419 395 |;
> #X text 427 328 delay_______;
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> #X coords 0 0 1 1 85 60 0;
>
>
>
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