[Discuss-gnuradio] FIR filter in fsk_tx.py

[Sachi]

Hi, Eric

I've got a question on the interpolation FIR filter in
the fsk_tx.py.  Here is the filter uesd:

interp_taps =  gr.firdes.low_pass (self.sw_interp,    
 # gain
                                              
self.fs,             # sampling rate
                                              
data_rate / 2 * 1.2, # cutoff
                                              
data_rate/2 * 0.4,   # trans width
                                              
gr.firdes.WIN_HANN)

I am a little confused. Why do you use sw_interp as
the gain? And how do you select the cutoff freq. and
transition bandwidth?

Thanks in advance

Sachi


                
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