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Pipo.slice help

MuBu
#1

Hello everyone,

I’m really excited to have discovered the mubu package! I’m still trying to work through the documentation and examples.

My question is about [pipo.slice]. In the help file, it appears that the data track has three columns, i.e. 3 separate signals, that are output by [mubu.play] as a list of 3 elements.

Then these lists go to [pipo.slice], that is supposed to do windowing for fft’s etc.
How are these three signals handled? Are they processed separately, i.e. we get 3 separate FFTs and spectra? Are they joined or summed somehow?
It looks like just the first is processed. If so, assuming we wanted to analyse all 3 signals, would we need to e.g. split the list and store to different tracks?

Also, the helpfile mentions “real-time fft using pipo.slice”, but I can see no fft process in the pipo object (like slice:fft).

Thanks a lot for any help!
Dani

#2

Could you guys please at least point me in the right direction?

#3

Hi Dani,

you’re right, the slice only uses the first element of the input frame, and the fft has been removed from the example (but not from the comment) for clarity.
To get 3 ffts you’d have to use 3 pipo instances for real-time, or 3 mubu.process with slice:select:fft for offline for now.

HOWEVER: If column-wise fft analysis is and important use-case we might consider adding a column-wise slice/fft option.

Best…
…Diemo

#4

Hi Diemo,

Thans for your answer.
It was more important for me to be clear on what input the various models need. I’m starting work on a project involving IMU sensors on dancers, so there’ll be plenty of data needing analysis. Separate instances is perfectly fine.

Thanks again,

Dani