I am studying the GMSK2 code now. The code is very clean and obviously designed sophisticatedly. I feel excited to read the code. Could you please help explain the following code to me?
alpha = 0.0002 # FIXME, maybe 0.0008/spb
self.freq_offset = gr.single_pole_iir_filter_ff(alpha)
self.sub = gr.sub_ff()
fg.connect(self.fmdemod, (self.sub, 0))
fg.connect(self.fmdemod, self.freq_offset, (self.sub, 1))
This part is following the FM demodulator. My guess is you are going to remove the DC offset, is that right? But why do you use an IIR filter?
I plan to add comments to the codes and put them on my website once I finish studying them.
Thanks for your time
Dawei
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