hamradio/gqrx
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Set filter ranges when changing modes. Update transition width every time filter width is changed.

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This commit is contained in:
Alexandru Csete 2010-11-03 23:34:16 +01:00
parent 39611b8cc3
commit 2ec1ab1043
1 changed files with 51 additions and 24 deletions
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71
gqrx.py
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@ -202,6 +202,30 @@ class main_window(QtGui.QMainWindow):
self.fc = offset self.fc = offset
self.gui.filterCenterSlider.setValue(offset) self.gui.filterCenterSlider.setValue(offset)
def set_filter_width_range(self, lower=1000, upper=15000, step=100):
"""
Set new lower and upper limit for the filter width widgets.
The function updates both the range of the slider and the spin box.
Standard ranges and step sizes:
FM-W: 50-200 kHz with 1 kHz step
AM and FM-N: 1-15 kHz with 100 Hz step
LSB and USB: 1-5 kHz with 50 Hz step
CW: 0.1-3 kHz with 10 Hz step
"""
if lower > upper:
print "Invalid filter range: ",lower," > ",upper
return
# slider
self.gui.filterWidthSlider.setRange(lower, upper)
self.gui.filterWidthSlider.setSingleStep(step)
self.gui.filterWidthSlider.setPageStep(10*step)
# spin box
self.gui.filterWidthSpin.setRange(lower, upper)
self.gui.filterWidthSpin.setSingleStep(step)
def set_tuning_range(self, rng): def set_tuning_range(self, rng):
""" """
Set new tuning range. Set new tuning range.
@ -429,8 +453,8 @@ class my_top_block(gr.top_block):
"USRP Display", "USRP Display",
True, True, False, False, False) True, True, False, False, False)
# frequency xlating filter used for tuning and first decimation # frequency xlating filter used for tuning and decimation
# to bring "IF rate" down to 250 ksps regardless of USRP decimation # to bring "demo rate" down to 50 ksps regardless of USRP decimation (250k for FM-W
taps = firdes.complex_band_pass(1, self._bandwidth, taps = firdes.complex_band_pass(1, self._bandwidth,
self._filter_low, self._filter_low,
self._filter_high, self._filter_high,
@ -441,15 +465,6 @@ class my_top_block(gr.top_block):
0, # center offset 0, # center offset
self._bandwidth) self._bandwidth)
# complex band pass filter 250 ksps
#self.bpf = gr.fir_filter_ccc(int(250000/self._if_rate),
# firdes.complex_band_pass(1, 250000,
# self._filter_low,
# self._filter_high,
# self._filter_trans,
# firdes.WIN_HAMMING, 6.76))
# AGC # AGC
self.agc = gr.agc2_cc(0.1, self._agc_decay, 0.5, 1.0, 0.6) self.agc = gr.agc2_cc(0.1, self._agc_decay, 0.5, 1.0, 0.6)
@ -460,7 +475,9 @@ class my_top_block(gr.top_block):
audio_stop=5500) audio_stop=5500)
# Narrow FM demodulator # Narrow FM demodulator
self.demod_fmn = blks2.nbfm_rx(audio_rate=self._demod_rate, quad_rate=self._demod_rate) self.demod_fmn = blks2.nbfm_rx(audio_rate=self._demod_rate,
quad_rate=self._demod_rate,
tau=75e-6, max_dev=5e3)
# Wide FM demodulator # Wide FM demodulator
self.demod_fmw = blks2.wfm_rcv(quad_rate=250000, self.demod_fmw = blks2.wfm_rcv(quad_rate=250000,
@ -632,6 +649,8 @@ class my_top_block(gr.top_block):
width = self._filter_high - self._filter_low width = self._filter_high - self._filter_low
self._filter_low = self._filter_offset - int(width/2) self._filter_low = self._filter_offset - int(width/2)
self._filter_high = self._filter_offset + int(width/2) self._filter_high = self._filter_offset + int(width/2)
# we need to update the filter shape as we go
self.set_filter_shape(self.main_win.gui.filterShapeCombo.currentIndex())
self.xlf.set_taps(firdes.complex_band_pass(1, self._bandwidth, self.xlf.set_taps(firdes.complex_band_pass(1, self._bandwidth,
self._filter_low, self._filter_low,
self._filter_high, self._filter_high,
@ -642,20 +661,24 @@ class my_top_block(gr.top_block):
""" """
Set the filter shape to soft, normal or sharp. Set the filter shape to soft, normal or sharp.
The filter shape is determined by the transition width. The filter shape is determined by the transition width.
Soft: 20% of the filter width Soft: 40% of the filter width
Normal: 10% of the filter width Normal: 25% of the filter width
Sharp: 5% of the filter width Sharp: 10% of the filter width
""" """
width = self._filter_high - self._filter_low width = self._filter_high - self._filter_low
if index == 0: if index == 0:
self._filter_trans = int(0.2*width) # soft, 20% of filter width self._filter_trans = int(0.4*width) # soft, 20% of filter width
elif index == 1: elif index == 1:
self._filter_trans = int(0.1*width) # normal, 10% of filter width self._filter_trans = int(0.25*width) # normal, 10% of filter width
elif index == 2: elif index == 2:
self._filter_trans = int(0.05*width) # sharp, 5% of filter width self._filter_trans = int(0.1*width) # sharp, 5% of filter width
else: else:
raise RuntimeError("Unknown filter shape") raise RuntimeError("Unknown filter shape")
# lower than this will probably not work
if self._filter_trans < 500:
self._filter_trans = 500
self.xlf.set_taps(firdes.complex_band_pass(1, self._bandwidth, self.xlf.set_taps(firdes.complex_band_pass(1, self._bandwidth,
self._filter_low, self._filter_low,
self._filter_high, self._filter_high,
@ -697,12 +720,11 @@ class my_top_block(gr.top_block):
else: else:
raise RuntimeError("Invalid state self._current_mode = " + self._current_mode) raise RuntimeError("Invalid state self._current_mode = " + self._current_mode)
print "FIXME: Filter slider range"
if mode == 0: if mode == 0:
self.demod = self.demod_am self.demod = self.demod_am
self._fm_active = False self._fm_active = False
self.connect(self.xlf, self.agc, self.demod, self.audio_rr) self.connect(self.xlf, self.agc, self.demod, self.audio_rr)
self.main_win.set_filter_width_range(1000, 15000, 100)
self.main_win.set_filter_center_slider_value(0) self.main_win.set_filter_center_slider_value(0)
self.main_win.set_filter_width_slider_value(8000) self.main_win.set_filter_width_slider_value(8000)
print "New mode: AM" print "New mode: AM"
@ -710,22 +732,24 @@ class my_top_block(gr.top_block):
elif mode == 1: elif mode == 1:
self.demod = self.demod_fmn self.demod = self.demod_fmn
self.connect(self.xlf, self.demod, self.audio_rr) self.connect(self.xlf, self.demod, self.audio_rr)
self.main_win.set_filter_width_range(1000, 15000, 100)
self.main_win.set_filter_center_slider_value(0) self.main_win.set_filter_center_slider_value(0)
self.main_win.set_filter_width_slider_value(8000) self.main_win.set_filter_width_slider_value(10000)
print "New mode: FM-N" print "New mode: FM-N"
elif mode == 2: elif mode == 2:
self.demod = self.demod_fmw self.demod = self.demod_fmw
self.connect(self.xlf, self.demod, self.audio_rr) self.connect(self.xlf, self.demod, self.audio_rr)
self.main_win.set_filter_width_range(50000, 200000, 1000)
self.main_win.set_filter_center_slider_value(0) self.main_win.set_filter_center_slider_value(0)
self.main_win.set_filter_width_slider_value(160000) self.main_win.set_filter_width_slider_value(160000)
self.set_filter_width(200000)
print "New mode: FM-W" print "New mode: FM-W"
elif mode == 3: elif mode == 3:
#self.disconnect(self.agc, self.demod, self.resampler) #self.disconnect(self.agc, self.demod, self.resampler)
self.demod = self.demod_ssb self.demod = self.demod_ssb
self.connect(self.xlf, self.agc, self.demod, self.audio_rr) self.connect(self.xlf, self.agc, self.demod, self.audio_rr)
self.main_win.set_filter_width_range(1000, 5000, 50)
self.main_win.set_filter_center_slider_value(-1500) self.main_win.set_filter_center_slider_value(-1500)
self.main_win.set_filter_width_slider_value(2400) self.main_win.set_filter_width_slider_value(2400)
print "New mode: LSB" print "New mode: LSB"
@ -734,6 +758,7 @@ class my_top_block(gr.top_block):
#self.disconnect(self.agc, self.demod, self.resampler) #self.disconnect(self.agc, self.demod, self.resampler)
self.demod = self.demod_ssb self.demod = self.demod_ssb
self.connect(self.xlf, self.agc, self.demod, self.audio_rr) self.connect(self.xlf, self.agc, self.demod, self.audio_rr)
self.main_win.set_filter_width_range(1000, 5000, 50)
self.main_win.set_filter_center_slider_value(1500) self.main_win.set_filter_center_slider_value(1500)
self.main_win.set_filter_width_slider_value(2400) self.main_win.set_filter_width_slider_value(2400)
print "New mode: USB" print "New mode: USB"
@ -742,6 +767,7 @@ class my_top_block(gr.top_block):
#self.disconnect(self.agc, self.demod, self.resampler) #self.disconnect(self.agc, self.demod, self.resampler)
self.demod = self.demod_ssb self.demod = self.demod_ssb
self.connect(self.xlf, self.agc, self.demod, self.audio_rr) self.connect(self.xlf, self.agc, self.demod, self.audio_rr)
self.main_win.set_filter_width_range(100, 3000, 10)
self.main_win.set_filter_center_slider_value(-700) self.main_win.set_filter_center_slider_value(-700)
self.main_win.set_filter_width_slider_value(1400) self.main_win.set_filter_width_slider_value(1400)
print "New mode: CW-L" print "New mode: CW-L"
@ -750,6 +776,7 @@ class my_top_block(gr.top_block):
#self.disconnect(self.agc, self.demod, self.resampler) #self.disconnect(self.agc, self.demod, self.resampler)
self.demod = self.demod_ssb self.demod = self.demod_ssb
self.connect(self.xlf, self.agc, self.demod, self.audio_rr) self.connect(self.xlf, self.agc, self.demod, self.audio_rr)
self.main_win.set_filter_width_range(100, 3000, 10)
self.main_win.set_filter_center_slider_value(700) self.main_win.set_filter_center_slider_value(700)
self.main_win.set_filter_width_slider_value(1400) self.main_win.set_filter_width_slider_value(1400)
print "New mode: CW-U" print "New mode: CW-U"