chan_coeffs = gr.firdes.low_pass (1.0, # gain
sw_decim * self.samples_per_symbol(), # sampling rate
1.0, # cutoff frequency: midpoint of trans. band
0.5, # width of trans. band
gr.firdes.WIN_HANN) # filter type
I checked that low pass function in doxygen, and it says cutoff frequency has unit measure [Hz].
Recalling above _expression_, it says that cutoff frequency is 1.0 Hz
Is it right? Or is it a factor that is normalized to the sampling frequency?
I'm asking about it because I want to use band_pass filter and I have no idea what value I have to choose for low/high cutoff frequency
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Seokseong Jeon, PhD Candidate
Communication & Networks Lab
IT Convergence Engineering (ITCE), POSTECH, Korea
+82 10 8338 1229, gee.songsong at gmail . com