git.gag.com Git - debian/gnuradio/blob - gr-utils/src/python/gr_filter_design.py

   1 #!/usr/bin/env python
   2
   3 try:
   4     import scipy
   5     from scipy import fftpack
   6 except ImportError:
   7     print "Please install SciPy to run this script (http://www.scipy.org/)"
   8     raise SystemExit, 1
   9
  10 import sys, os
  11 from PyQt4 import Qt, QtCore, QtGui
  12 import PyQt4.Qwt5 as Qwt
  13 from optparse import OptionParser
  14 from gnuradio import gr, blks2, eng_notation
  15 from scipy import fftpack
  16
  17 from pyqt_filter import Ui_MainWindow
  18 from pyqt_filter_firlpf import Ui_firlpfForm
  19 from pyqt_filter_firhpf import Ui_firhpfForm
  20
  21 class gr_plot_filter(QtGui.QMainWindow):
  22     def __init__(self, qapp, options):
  23         QtGui.QWidget.__init__(self, None)
  24         self.gui = Ui_MainWindow()
  25         self.gui.setupUi(self)
  26
  27         self.connect(self.gui.filterTypeComboBox,
  28                      Qt.SIGNAL("currentIndexChanged(const QString&)"),
  29                      self.changed_filter_type)
  30         self.connect(self.gui.filterDesignTypeComboBox,
  31                      Qt.SIGNAL("currentIndexChanged(const QString&)"),
  32                      self.changed_filter_design_type)
  33
  34         self.connect(self.gui.designButton,
  35                      Qt.SIGNAL("released()"),
  36                      self.design)
  37
  38         self.connect(self.gui.tabGroup,
  39                      Qt.SIGNAL("currentChanged(int)"),
  40                      self.tab_changed)
  41
  42         self.gui.designButton.setShortcut("Return")
  43
  44         self.taps = []
  45
  46         self.gui.lpfPassBandRippleLabel.setVisible(False)
  47         self.gui.lpfPassBandRippleEdit.setVisible(False)
  48         self.gui.bpfPassBandRippleLabel.setVisible(False)
  49         self.gui.bpfPassBandRippleEdit.setVisible(False)
  50         self.gui.hpfPassBandRippleLabel.setVisible(False)
  51         self.gui.hpfPassBandRippleEdit.setVisible(False)
  52
  53         # Initialize to LPF
  54         self.gui.filterTypeWidget.setCurrentWidget(self.gui.firlpfPage)
  55
  56         # Set up plot curves
  57         self.rcurve = Qwt.QwtPlotCurve("Real")
  58         self.rcurve.attach(self.gui.timePlot)
  59
  60         self.freqcurve = Qwt.QwtPlotCurve("PSD")
  61         self.freqcurve.attach(self.gui.freqPlot)
  62
  63         # Create zoom functionality for the plots
  64         self.timeZoomer = Qwt.QwtPlotZoomer(self.gui.timePlot.xBottom,
  65                                             self.gui.timePlot.yLeft,
  66                                             Qwt.QwtPicker.PointSelection,
  67                                             Qwt.QwtPicker.AlwaysOn,
  68                                             self.gui.timePlot.canvas())
  69
  70         self.freqZoomer = Qwt.QwtPlotZoomer(self.gui.freqPlot.xBottom,
  71                                             self.gui.freqPlot.yLeft,
  72                                             Qwt.QwtPicker.PointSelection,
  73                                             Qwt.QwtPicker.AlwaysOn,
  74                                             self.gui.freqPlot.canvas())
  75
  76         # Set up pen for colors and line width
  77         blue = QtGui.qRgb(0x00, 0x00, 0xFF)
  78         blueBrush = Qt.QBrush(Qt.QColor(blue))
  79         self.freqcurve.setPen(Qt.QPen(blueBrush, 2))
  80         self.rcurve.setPen(Qt.QPen(blueBrush, 2))
  81
  82         self.filterWindows = {"Hamming Window" : gr.firdes.WIN_HAMMING,
  83                               "Hann Window" : gr.firdes.WIN_HANN,
  84                               "Blackman Window" : gr.firdes.WIN_BLACKMAN,
  85                               "Rectangular Window" : gr.firdes.WIN_RECTANGULAR,
  86                               "Kaiser Window" : gr.firdes.WIN_KAISER,
  87                               "Blackman-harris Window" : gr.firdes.WIN_BLACKMAN_hARRIS}
  88
  89         self.show()
  90
  91     def changed_filter_type(self, ftype):
  92         strftype = str(ftype.toAscii())
  93         if(ftype == "Low Pass"):
  94             self.gui.filterTypeWidget.setCurrentWidget(self.gui.firlpfPage)
  95         elif(ftype == "Band Pass"):
  96             self.gui.filterTypeWidget.setCurrentWidget(self.gui.firbpfPage)
  97         elif(ftype == "High Pass"):
  98             self.gui.filterTypeWidget.setCurrentWidget(self.gui.firhpfPage)
  99
 100         self.design()
 101
 102     def changed_filter_design_type(self, design):
 103         if(design == "Equiripple"):
 104             self.set_equiripple()
 105         else:
 106             self.set_windowed()
 107
 108         self.design()
 109
 110     def set_equiripple(self):
 111         self.equiripple = True
 112         self.gui.lpfPassBandRippleLabel.setVisible(True)
 113         self.gui.lpfPassBandRippleEdit.setVisible(True)
 114         self.gui.bpfPassBandRippleLabel.setVisible(True)
 115         self.gui.bpfPassBandRippleEdit.setVisible(True)
 116         self.gui.hpfPassBandRippleLabel.setVisible(True)
 117         self.gui.hpfPassBandRippleEdit.setVisible(True)
 118
 119     def set_windowed(self):
 120         self.equiripple = False
 121         self.gui.lpfPassBandRippleLabel.setVisible(False)
 122         self.gui.lpfPassBandRippleEdit.setVisible(False)
 123         self.gui.bpfPassBandRippleLabel.setVisible(False)
 124         self.gui.bpfPassBandRippleEdit.setVisible(False)
 125         self.gui.hpfPassBandRippleLabel.setVisible(False)
 126         self.gui.hpfPassBandRippleEdit.setVisible(False)
 127
 128     def design(self):
 129         ret = True
 130         fs,r = self.gui.sampleRateEdit.text().toDouble()
 131         ret = r and ret
 132         gain,r = self.gui.filterGainEdit.text().toDouble()
 133         ret = r and ret
 134
 135         if(ret):
 136             winstr = str(self.gui.filterDesignTypeComboBox.currentText().toAscii())
 137             ftype = str(self.gui.filterTypeComboBox.currentText().toAscii())
 138
 139             if(winstr == "Equiripple"):
 140                 designer = {"Low Pass" : self.design_opt_lpf,
 141                             "Band Pass" : self.design_opt_bpf,
 142                             "High Pass" :  self.design_opt_hpf}
 143                 taps,r = designer[ftype](fs, gain)
 144
 145             else:
 146                 designer = {"Low Pass" : self.design_win_lpf,
 147                             "Band Pass" : self.design_win_bpf,
 148                             "High Pass" :  self.design_win_hpf}
 149                 wintype = self.filterWindows[winstr]
 150                 taps,r = designer[ftype](fs, gain, wintype)
 151
 152             if(r):
 153                 self.update_time_curves(taps)
 154                 self.update_freq_curves(taps)
 155
 156
 157     # Filter design functions using a window
 158     def design_win_lpf(self, fs, gain, wintype):
 159         ret = True
 160         pb,r = self.gui.endofLpfPassBandEdit.text().toDouble()
 161         ret = r and ret
 162         sb,r = self.gui.startofLpfStopBandEdit.text().toDouble()
 163         ret = r and ret
 164         atten,r = self.gui.lpfStopBandAttenEdit.text().toDouble()
 165         ret = r and ret
 166
 167         if(ret):
 168             tb = sb - pb
 169
 170             taps = gr.firdes.low_pass_2(gain, fs, pb, tb,
 171                                         atten, wintype)
 172             return (taps, ret)
 173         else:
 174             return ([], ret)
 175
 176     def design_win_bpf(self, fs, gain, wintype):
 177         ret = True
 178         pb1,r = self.gui.startofBpfPassBandEdit.text().toDouble()
 179         ret = r and ret
 180         pb2,r = self.gui.endofBpfPassBandEdit.text().toDouble()
 181         ret = r and ret
 182         tb,r  = self.gui.bpfTransitionEdit.text().toDouble()
 183         ret = r and ret
 184         atten,r = self.gui.bpfStopBandAttenEdit.text().toDouble()
 185         ret = r and ret
 186
 187         if(r):
 188             taps = gr.firdes.band_pass_2(gain, fs, pb1, pb2, tb,
 189                                          atten, wintype)
 190             return (taps,r)
 191         else:
 192             return ([],r)
 193
 194     def design_win_hpf(self, fs, gain, wintype):
 195         ret = True
 196         sb,r = self.gui.endofHpfStopBandEdit.text().toDouble()
 197         ret = r and ret
 198         pb,r = self.gui.startofHpfPassBandEdit.text().toDouble()
 199         ret = r and ret
 200         atten,r = self.gui.hpfStopBandAttenEdit.text().toDouble()
 201         ret = r and ret
 202
 203         if(r):
 204             tb = pb - sb
 205             taps = gr.firdes.high_pass_2(gain, fs, pb, tb,
 206                                          atten, wintype)
 207             return (taps,r)
 208         else:
 209             return ([],r)
 210
 211
 212
 213     # Design Functions for Equiripple Filters
 214     def design_opt_lpf(self, fs, gain, wintype=None):
 215         ret = True
 216         pb,r = self.gui.endofLpfPassBandEdit.text().toDouble()
 217         ret = r and ret
 218         sb,r = self.gui.startofLpfStopBandEdit.text().toDouble()
 219         ret = r and ret
 220         atten,r = self.gui.lpfStopBandAttenEdit.text().toDouble()
 221         ret = r and ret
 222         ripple,r = self.gui.lpfPassBandRippleEdit.text().toDouble()
 223         ret = r and ret
 224
 225         if(ret):
 226             taps = blks2.optfir.low_pass(gain, fs, pb, sb,
 227                                          ripple, atten)
 228             return (taps, ret)
 229         else:
 230             return ([], ret)
 231
 232     def design_opt_bpf(self, fs, gain, wintype=None):
 233         ret = True
 234         pb1,r = self.gui.startofBpfPassBandEdit.text().toDouble()
 235         ret = r and ret
 236         pb2,r = self.gui.endofBpfPassBandEdit.text().toDouble()
 237         ret = r and ret
 238         tb,r  = self.gui.bpfTransitionEdit.text().toDouble()
 239         ret = r and ret
 240         atten,r = self.gui.bpfStopBandAttenEdit.text().toDouble()
 241         ret = r and ret
 242         ripple,r = self.gui.bpfPassBandRippleEdit.text().toDouble()
 243         ret = r and ret
 244
 245         if(r):
 246             sb1 = pb1 - tb
 247             sb2 = pb2 + tb
 248             taps = blks2.optfir.band_pass(gain, fs, sb1, pb1, pb2, sb2,
 249                                           ripple, atten)
 250             return (taps,r)
 251         else:
 252             return ([],r)
 253
 254     def design_opt_hpf(self, fs, gain, wintype=None):
 255         ret = True
 256         sb,r = self.gui.endofHpfStopBandEdit.text().toDouble()
 257         ret = r and ret
 258         pb,r = self.gui.startofHpfPassBandEdit.text().toDouble()
 259         ret = r and ret
 260         atten,r = self.gui.hpfStopBandAttenEdit.text().toDouble()
 261         ret = r and ret
 262         ripple,r = self.gui.hpfPassBandRippleEdit.text().toDouble()
 263         ret = r and ret
 264
 265         if(r):
 266             taps = blks2.optfir.high_pass(gain, fs, sb, pb,
 267                                           atten, ripple)
 268             return (taps,r)
 269         else:
 270             return ([],r)
 271
 272     def tab_changed(self, tab):
 273         if(tab == 0):
 274             self.update_freq_curves(self.taps)
 275         if(tab == 1):
 276             self.update_time_curves(self.taps)
 277
 278     def update_time_curves(self, taps):
 279         self.taps = taps
 280         ntaps = len(taps)
 281         if(ntaps > 0):
 282             self.rcurve.setData(scipy.arange(ntaps), taps)
 283
 284             # Reset the x-axis to the new time scale
 285             ymax = 1.5 * max(taps)
 286             ymin = 1.5 * min(taps)
 287             self.gui.timePlot.setAxisScale(self.gui.timePlot.xBottom,
 288                                            0, ntaps)
 289             self.gui.timePlot.setAxisScale(self.gui.timePlot.yLeft,
 290                                            ymin, ymax)
 291
 292             # Set the zoomer base to unzoom to the new axis
 293             rect = Qt.QRectF(0, ymin, (ntaps-0), (ymax-ymin))
 294             self.timeZoomer.setZoomBase(rect)
 295
 296             self.gui.timePlot.replot()
 297
 298     def update_freq_curves(self, taps, Npts=1000):
 299         if(len(taps) > 0):
 300             fftpts = fftpack.fft(taps, Npts)
 301             freq = scipy.arange(0, Npts)
 302
 303             fftdB = 20.0*scipy.log10(abs(fftpts))
 304
 305             self.freqcurve.setData(freq, fftdB)
 306
 307             # Reset the x-axis to the new time scale
 308             ymax = 1.5 * max(fftdB)
 309             ymin = 1.5 * min(fftdB)
 310             self.gui.freqPlot.setAxisScale(self.gui.freqPlot.xBottom,
 311                                            0, Npts/2)
 312             self.gui.timePlot.setAxisScale(self.gui.timePlot.yLeft,
 313                                            ymin, ymax)
 314
 315             # Set the zoomer base to unzoom to the new axis
 316             self.freqZoomer.setZoomBase()
 317
 318             self.gui.freqPlot.replot()
 319
 320
 321 def setup_options():
 322     usage="%prog: [options] (input_filename)"
 323     description = ""
 324
 325     parser = OptionParser(conflict_handler="resolve",
 326                           usage=usage, description=description)
 327     return parser
 328
 329 def main(args):
 330     parser = setup_options()
 331     (options, args) = parser.parse_args ()
 332
 333     app = Qt.QApplication(args)
 334     gplt = gr_plot_filter(app, options)
 335     app.exec_()
 336
 337 if __name__ == '__main__':
 338     main(sys.argv)
 339