I am looking for a software that displays the FFT of a signal and provides a GUI which allows me to conveniently move or resize the window to select only a part of my signal while updating the FFT "live".
I have many different signals to analyse (generated by my own software and saved in text files with two columns) and the frequencies present in my signal vary from time to time. So it would be very helpful to focus on particular parts of my signal, in particular a convenient way to select only a certain part of my signal would be incredibly helpful.
I have googled quite a bit but cannot find a software that does this "window change" live.
If that software provided a Prony analysis as well, that would be another useful thing.
I should add that the software should run on Linux or Mac and hopefully be free.
I just found ScopeDSP which perhaps could provide what I want (?) but at $299 that is not affordable for me and also it runs only on Windows.