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   1 #
   2 # Copyright 2008 Free Software Foundation, Inc.
   3 #
   4 # This file is part of GNU Radio
   5 #
   6 # GNU Radio is free software; you can redistribute it and/or modify
   7 # it under the terms of the GNU General Public License as published by
   8 # the Free Software Foundation; either version 3, or (at your option)
   9 # any later version.
  10 #
  11 # GNU Radio is distributed in the hope that it will be useful,
  12 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 # GNU General Public License for more details.
  15 #
  16 # You should have received a copy of the GNU General Public License
  17 # along with GNU Radio; see the file COPYING.  If not, write to
  18 # the Free Software Foundation, Inc., 51 Franklin Street,
  19 # Boston, MA 02110-1301, USA.
  20 #
  21
  22 ##################################################
  23 # Imports
  24 ##################################################
  25 import fft_window
  26 import common
  27 from gnuradio import gr, blks2
  28 from pubsub import pubsub
  29 from constants import *
  30
  31 ##################################################
  32 # FFT sink block (wrapper for old wxgui)
  33 ##################################################
  34 class _fft_sink_base(gr.hier_block2):
  35         """
  36         An fft block with real/complex inputs and a gui window.
  37         """
  38
  39         def __init__(
  40                 self,
  41                 parent,
  42                 baseband_freq=0,
  43                 ref_scale=2.0,
  44                 y_per_div=10,
  45                 y_divs=8,
  46                 ref_level=50,
  47                 sample_rate=1,
  48                 fft_size=512,
  49                 fft_rate=fft_window.DEFAULT_FRAME_RATE,
  50                 average=False,
  51                 avg_alpha=None,
  52                 title='',
  53                 size=fft_window.DEFAULT_WIN_SIZE,
  54                 peak_hold=False,
  55         ):
  56                 #ensure avg alpha
  57                 if avg_alpha is None: avg_alpha = 2.0/fft_rate
  58                 #init
  59                 gr.hier_block2.__init__(
  60                         self,
  61                         "fft_sink",
  62                         gr.io_signature(1, 1, self._item_size),
  63                         gr.io_signature(0, 0, 0),
  64                 )
  65                 #blocks
  66                 fft = self._fft_chain(
  67                         sample_rate=sample_rate,
  68                         fft_size=fft_size,
  69                         frame_rate=fft_rate,
  70                         ref_scale=ref_scale,
  71                         avg_alpha=avg_alpha,
  72                         average=average,
  73                 )
  74                 msgq = gr.msg_queue(2)
  75                 sink = gr.message_sink(gr.sizeof_float*fft_size, msgq, True)
  76                 #connect
  77                 self.connect(self, fft, sink)
  78                 #controller
  79                 self.controller = pubsub()
  80                 self.controller.subscribe(AVERAGE_KEY, fft.set_average)
  81                 self.controller.publish(AVERAGE_KEY, fft.average)
  82                 self.controller.subscribe(AVG_ALPHA_KEY, fft.set_avg_alpha)
  83                 self.controller.publish(AVG_ALPHA_KEY, fft.avg_alpha)
  84                 self.controller.subscribe(SAMPLE_RATE_KEY, fft.set_sample_rate)
  85                 self.controller.publish(SAMPLE_RATE_KEY, fft.sample_rate)
  86                 #start input watcher
  87                 common.input_watcher(msgq, self.controller, MSG_KEY)
  88                 #create window
  89                 self.win = fft_window.fft_window(
  90                         parent=parent,
  91                         controller=self.controller,
  92                         size=size,
  93                         title=title,
  94                         real=self._real,
  95                         fft_size=fft_size,
  96                         baseband_freq=baseband_freq,
  97                         sample_rate_key=SAMPLE_RATE_KEY,
  98                         y_per_div=y_per_div,
  99                         y_divs=y_divs,
 100                         ref_level=ref_level,
 101                         average_key=AVERAGE_KEY,
 102                         avg_alpha_key=AVG_ALPHA_KEY,
 103                         peak_hold=peak_hold,
 104                         msg_key=MSG_KEY,
 105                 )
 106                 common.register_access_methods(self, self.win)
 107                 setattr(self.win, 'set_baseband_freq', getattr(self, 'set_baseband_freq')) #BACKWARDS
 108                 setattr(self.win, 'set_peak_hold', getattr(self, 'set_peak_hold')) #BACKWARDS
 109
 110 class fft_sink_f(_fft_sink_base):
 111         _fft_chain = blks2.logpwrfft_f
 112         _item_size = gr.sizeof_float
 113         _real = True
 114
 115 class fft_sink_c(_fft_sink_base):
 116         _fft_chain = blks2.logpwrfft_c
 117         _item_size = gr.sizeof_gr_complex
 118         _real = False
 119
 120 # ----------------------------------------------------------------
 121 # Standalone test app
 122 # ----------------------------------------------------------------
 123
 124 import wx
 125 from gnuradio.wxgui import stdgui2
 126
 127 class test_app_block (stdgui2.std_top_block):
 128     def __init__(self, frame, panel, vbox, argv):
 129         stdgui2.std_top_block.__init__ (self, frame, panel, vbox, argv)
 130
 131         fft_size = 256
 132
 133         # build our flow graph
 134         input_rate = 20.48e3
 135
 136         # Generate a complex sinusoid
 137         #src1 = gr.sig_source_c (input_rate, gr.GR_SIN_WAVE, 2e3, 1)
 138         src1 = gr.sig_source_c (input_rate, gr.GR_CONST_WAVE, 5.75e3, 1)
 139
 140         # We add these throttle blocks so that this demo doesn't
 141         # suck down all the CPU available.  Normally you wouldn't use these.
 142         thr1 = gr.throttle(gr.sizeof_gr_complex, input_rate)
 143
 144         sink1 = fft_sink_c (panel, title="Complex Data", fft_size=fft_size,
 145                             sample_rate=input_rate, baseband_freq=100e3,
 146                             ref_level=0, y_per_div=20, y_divs=10)
 147         vbox.Add (sink1.win, 1, wx.EXPAND)
 148
 149         self.connect(src1, thr1, sink1)
 150
 151         #src2 = gr.sig_source_f (input_rate, gr.GR_SIN_WAVE, 2e3, 1)
 152         src2 = gr.sig_source_f (input_rate, gr.GR_CONST_WAVE, 5.75e3, 1)
 153         thr2 = gr.throttle(gr.sizeof_float, input_rate)
 154         sink2 = fft_sink_f (panel, title="Real Data", fft_size=fft_size*2,
 155                             sample_rate=input_rate, baseband_freq=100e3,
 156                             ref_level=0, y_per_div=20, y_divs=10)
 157         vbox.Add (sink2.win, 1, wx.EXPAND)
 158
 159         self.connect(src2, thr2, sink2)
 160
 161 def main ():
 162     app = stdgui2.stdapp (test_app_block, "FFT Sink Test App")
 163     app.MainLoop ()
 164
 165 if __name__ == '__main__':
 166     main ()