Passing taps to the filter using file in gnuradio

Question

I'm trying to pass 2000 taps to the fft filter in gnuradio. How can i read file and pass it to the fft filter tap filed?

Answer 1

This cannot be done. However you can use the Filter Taps variables available in the GRC to produce the desired taps at the initialization of your flowgraph. Pass the ID of the variable at the taps field of your FFT filter block and you are done.

If your taps are very specific and cannot be constructed from the available filter taps variable, you could possibly edit the generated python file and use a python array to store them.

EDIT: As @Marcus noted you can use numpy to load taps from a file. Just use the Import element from the GRC to import numpy and then using a Variable element, use numpy.fromfile('filename') to load the desired taps.