Why can't I see any change in number~ in pfft~ subpatch ?

Jun 28, 2006 at 12:29am

Why can't I see any change in number~ in pfft~ subpatch ?

I am trying some example patches of cycling74 that deal with FFT. Everything works fine except that when I connect number~ to the output of framedelta~, phaserwrap~, frameaccum~, and the rightmost output of fftin~, the number~ box never changes.

I turned on the dac~, and all the patches function OK except this little thing. Is it normal ? Why ?

Please help explain a little bit.
Thank you very much.

#26595
Jun 28, 2006 at 1:20am

As a workaround, have you tried using fftout~ with the ‘nofft’ message? It should allow you to connect your number~ object outside of fft-world.

#79757
Jun 28, 2006 at 10:47am

Hiya,

OK – This is (usually) normal behaviour for pfft~ because:

number~ displays the first value in each signal vector.

in a pfft~ each signal vector is equivalent to one frame of the fft.

the first value in the signal vector will hence be the value from bin zero (the DC bin)

Normally your audio input will have no DC content and even if it does the phase content will be zero (DC has no phase) so you can expect zero values in this bin.

If you want to view values from other bins (much much more useful) use capture~ or snapshot~ connected to a float numberbox(the later from what i remember allows you to select an offset from the beginning of a signal vector – and hence the bin you wish to view)

Hope this helps explain things!
Alex

#79758
Jun 28, 2006 at 4:09pm

Cheng Chien-Wen wrote:
> I turned on the dac~, and all the patches function OK except this
> little thing. Is it normal ? Why ?

It is normal, as it would only show the last value of a signal vector,
and thats always the same in this case. Use capture~ to see more…

Stefan


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#79759

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