hamradio/gqrx
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Added basic AGC. Details to be worked out later.

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This commit is contained in:
Alexandru Csete 2010-10-30 21:54:50 +02:00
parent 9f71618c88
commit 2a77180ad3
1 changed files with 19 additions and 14 deletions
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33
gqrx.py
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@ -300,6 +300,7 @@ class my_top_block(gr.top_block):
self._filter_low = -4000
self._filter_high = 4000
self._filter_trans = 800
self._agc_decay = 5e-5
self._if_rate = 50000
self._audio_rate = 44100
@ -385,7 +386,10 @@ class my_top_block(gr.top_block):
self._filter_high,
self._filter_trans,
firdes.WIN_HAMMING, 6.76))
# AGC
self.agc = gr.agc2_cc(0.1, self._agc_decay, 0.7, 1.0, 1.0)
# AM demodulator
self.demod_am = blks2.am_demod_cf(channel_rate=self._if_rate,
audio_decim=1,
@ -422,7 +426,8 @@ class my_top_block(gr.top_block):
# Connect the flow graph
self.connect(self.u, self.snk)
self.connect(self.u, self.xlf, self.bpf, self.demod, self.resampler,
self.connect(self.u, self.xlf, self.bpf,
self.agc, self.demod, self.resampler,
self.audio_gain, self.audio_sink)
@ -560,17 +565,17 @@ class my_top_block(gr.top_block):
self.wait()
if mode == 0:
self.disconnect(self.bpf, self.demod, self.resampler)
self.disconnect(self.agc, self.demod, self.resampler)
self.demod = self.demod_am
self.connect(self.bpf, self.demod, self.resampler)
self.connect(self.agc, self.demod, self.resampler)
self.main_win.set_filter_center_slider_value(0)
self.main_win.set_filter_width_slider_value(8000)
print "New mode: AM"
elif mode == 1:
self.disconnect(self.bpf, self.demod, self.resampler)
self.disconnect(self.agc, self.demod, self.resampler)
self.demod = self.demod_fmn
self.connect(self.bpf, self.demod, self.resampler)
self.connect(self.agc, self.demod, self.resampler)
self.main_win.set_filter_center_slider_value(0)
self.main_win.set_filter_width_slider_value(8000)
print "New mode: FM-N"
@ -579,33 +584,33 @@ class my_top_block(gr.top_block):
print "New mode: FM-W (not implemented)"
elif mode == 3:
self.disconnect(self.bpf, self.demod, self.resampler)
self.disconnect(self.agc, self.demod, self.resampler)
self.demod = self.demod_ssb
self.connect(self.bpf, self.demod, self.resampler)
self.connect(self.agc, self.demod, self.resampler)
self.main_win.set_filter_center_slider_value(-1500)
self.main_win.set_filter_width_slider_value(2400)
print "New mode: LSB"
elif mode == 4:
self.disconnect(self.bpf, self.demod, self.resampler)
self.disconnect(self.agc, self.demod, self.resampler)
self.demod = self.demod_ssb
self.connect(self.bpf, self.demod, self.resampler)
self.connect(self.agc, self.demod, self.resampler)
self.main_win.set_filter_center_slider_value(1500)
self.main_win.set_filter_width_slider_value(2400)
print "New mode: USB"
elif mode == 5:
self.disconnect(self.bpf, self.demod, self.resampler)
self.disconnect(self.agc, self.demod, self.resampler)
self.demod = self.demod_ssb
self.connect(self.bpf, self.demod, self.resampler)
self.connect(self.agc, self.demod, self.resampler)
self.main_win.set_filter_center_slider_value(-700)
self.main_win.set_filter_width_slider_value(1400)
print "New mode: CW-L"
elif mode == 6:
self.disconnect(self.bpf, self.demod, self.resampler)
self.disconnect(self.agc, self.demod, self.resampler)
self.demod = self.demod_ssb
self.connect(self.bpf, self.demod, self.resampler)
self.connect(self.agc, self.demod, self.resampler)
self.main_win.set_filter_center_slider_value(700)
self.main_win.set_filter_width_slider_value(1400)
print "New mode: CW-U"