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[Discuss-gnuradio] airprobe xlating filter question
From: |
HW Wong |
Subject: |
[Discuss-gnuradio] airprobe xlating filter question |
Date: |
Sat, 12 Mar 2011 15:37:00 +0800 |
It's known that the channel band width is 200KHz
When looking into airprobe, gsm_receiver.py
the cutoff freq in xlating is 145KHz, Can anyone kindly to explain. Thanks!
filter_cutoff = 145e3
filter_t_width = 10e3
filter_taps = gr.firdes.low_pass(1.0, self.input_rate, filter_cutoff, filter_t_width, gr.firdes.WIN_HAMMING)
filtr = gr.freq_xlating_fir_filter_ccf(1, filter_taps, offset, self.input_rate)
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