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

[José Henrique Padovani]

First, let me thank Miller and Geiger for the answers...

So, on my patch I have set the main patch to the same block that the 
sub-patch with overlaping.... that one is the [pd sub-block]. There is 
the overlap... So, if the PD worked on the first way, I would have a 
doubled signal where the samples of the second half of the block would 
be multiplied by 2 (i.e. second half of the first overlap would be equal 
to the first half of the second overlap). But what hapens is that the 
second half of the first overlap is not equal to the first half of the 
first overlap... If it was a simple sine-wave with frequency equal to 
(sample rate)/(block-size) I would have a sine wave with doubled 
amplitude in in the first way (time-continuos overlaping) or a zeroed 
signal in first case (what happens in PD). On my patch (which need to be 
initialized with a block choose for all patches - I forgot the loadbang 
for default 256...) I would have exact a doubled signal if PD worked 
on-the-flow (of main patch) for overlapping in sub-patch. It ([block~]'s 
inlet~) seens to buffer the input of the last N samples of the main 
patch and making a simple delay of N/2, starting there from the 
beggining of the block. On this way it is the same result of use a 
[delwrite~] / [delread~] pair with N/2 samples of delay...
Isn't it?
Sorry if I am redundant or didn't understand your explanations, I am 
really trying to understand (I have read the chapter nine of Puckette's 
book yesterday but didn't got it yet. Probably I'll read it with more 
care on July holidays)..
Well, thanks again,
Zé

geiger escreveu:

> 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 190 -23 pd sin-and-triangle;
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>> #X coords 0 1 512 -1 400 140 1;
>> #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;
>> #X text 180 -80 32;
>> #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 |;
>> #X text 419 265 |;
>> #X text 419 275 |;
>> #X text 419 285 |;
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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_______;
>> #X connect 0 0 7 0;
>> #X connect 2 0 24 0;
>> #X connect 6 0 12 0;
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>> #X coords 0 0 1 1 85 60 0;
>>
>>
>>
>> _______________________________________________________
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>>
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>>
>>     
>
>
>   


		
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