Dawei:
You have understood it. Can you suggest a less expensive way than a
single pole iir filter (integrator) to compute the running average of
the data so we can subtract that mean? That was the only thought. We
needed a very low frequency cut off and this is computationally cheap.
Bob
Dawei Shen wrote:
Hi Eric and other dudes
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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