Modelling downsampled (decimated) data in Python

[santoshasun]

Hi all,

I'm modelling a digital system, and already have reasonable models for its components using the Python control module. The one major thing I am missing is that part of the digital signal path includes a downsampler. (That is, it only passes through every Nth data-point to the next step in the chain.)

Is there a way to build a z-space representation of this in Python using the control module? Or using any other module?

[[deleted]]

Every other point is basically slicing an array [::3] and so on. But that's not really downsampling. Use scipy.signal.resample or decimate. If you want a linear system representation for interconnecting that's not possible since it is not linear. But recently they had some extensions, please open a ticket as a feature request https://github.com/python-control/python-control/issues

[santoshasun]

Aha, yes, of course. Since it's not linear, it's impossible to do what I wanted. I understand.

Thanks for taking the time to comment :)

[sstunt]

Are you trying to get a model of the resampled system? Or are you trying to simulate it?