FM Radio
pymelab@workstation:~$ cat fm_radio_rx.py
#!/usr/bin/env python
##################################################
# Gnuradio Python Flow Graph
# Title: Radio
# Generated: Wed Aug 13 10:59:27 2014
##################################################
from gnuradio import analog
from gnuradio import audio
from gnuradio import blocks
from gnuradio import eng_notation
from gnuradio import filter
from gnuradio import gr
from gnuradio import wxgui
from gnuradio.eng_option import eng_option
from gnuradio.fft import window
from gnuradio.filter import firdes
from gnuradio.wxgui import fftsink2
from gnuradio.wxgui import forms
from grc_gnuradio import wxgui as grc_wxgui
from optparse import OptionParser
import osmosdr
import wx
class radio(grc_wxgui.top_block_gui):
def __init__(self):
grc_wxgui.top_block_gui.__init__(self, title="Radio")
_icon_path = "/usr/share/icons/hicolor/32x32/apps/gnuradio-grc.png"
self.SetIcon(wx.Icon(_icon_path, wx.BITMAP_TYPE_ANY))
##################################################
# Variables
##################################################
self.volume = volume = 1
self.sample_rate = sample_rate = 5e6
self.freq = freq = 105.1e6
self.fm_sample = fm_sample = 500e3
self.audio_rate = audio_rate = 48e3
##################################################
# Blocks
##################################################
_volume_sizer = wx.BoxSizer(wx.VERTICAL)
self._volume_text_box = forms.text_box(
parent=self.GetWin(),
sizer=_volume_sizer,
value=self.volume,
callback=self.set_volume,
label="Volume",
converter=forms.float_converter(),
proportion=0,
)
self._volume_slider = forms.slider(
parent=self.GetWin(),
sizer=_volume_sizer,
value=self.volume,
callback=self.set_volume,
minimum=0,
maximum=10,
num_steps=20,
style=wx.SL_HORIZONTAL,
cast=float,
proportion=1,
)
self.Add(_volume_sizer)
_freq_sizer = wx.BoxSizer(wx.VERTICAL)
self._freq_text_box = forms.text_box(
parent=self.GetWin(),
sizer=_freq_sizer,
value=self.freq,
callback=self.set_freq,
label="Frequency",
converter=forms.float_converter(),
proportion=0,
)
self._freq_slider = forms.slider(
parent=self.GetWin(),
sizer=_freq_sizer,
value=self.freq,
callback=self.set_freq,
minimum=80e6,
maximum=180e6,
num_steps=1000,
style=wx.SL_HORIZONTAL,
cast=float,
proportion=1,
)
self.Add(_freq_sizer)
self.wxgui_fftsink2_0 = fftsink2.fft_sink_c(
self.GetWin(),
baseband_freq=freq,
y_per_div=10,
y_divs=10,
ref_level=0,
ref_scale=2.0,
sample_rate=sample_rate,
fft_size=1024,
fft_rate=15,
average=False,
avg_alpha=None,
title="FFT Plot",
peak_hold=False,
)
self.Add(self.wxgui_fftsink2_0.win)
self.rational_resampler_xxx_0 = filter.rational_resampler_fff(
interpolation=int(audio_rate/1000),
decimation=int(fm_sample/10000),
taps=None,
fractional_bw=None,
)
self.osmosdr_source_0 = osmosdr.source( args="numchan=" + str(1) + " " + "" )
self.osmosdr_source_0.set_sample_rate(sample_rate)
self.osmosdr_source_0.set_center_freq(freq, 0)
self.osmosdr_source_0.set_freq_corr(0, 0)
self.osmosdr_source_0.set_dc_offset_mode(0, 0)
self.osmosdr_source_0.set_iq_balance_mode(0, 0)
self.osmosdr_source_0.set_gain_mode(False, 0)
self.osmosdr_source_0.set_gain(10, 0)
self.osmosdr_source_0.set_if_gain(20, 0)
self.osmosdr_source_0.set_bb_gain(20, 0)
self.osmosdr_source_0.set_antenna("", 0)
self.osmosdr_source_0.set_bandwidth(0, 0)
self.low_pass_filter_0 = filter.fir_filter_ccf(int(sample_rate / fm_sample), firdes.low_pass(
1, sample_rate, 100e3, 10e3, firdes.WIN_HAMMING, 6.76))
self.blocks_multiply_xx_0 = blocks.multiply_vff(1)
self.audio_sink_0 = audio.sink(int(audio_rate), "", True)
self.analog_wfm_rcv_0 = analog.wfm_rcv(
quad_rate=fm_sample,
audio_decimation=10,
)
self.analog_const_source_x_0 = analog.sig_source_f(0, analog.GR_CONST_WAVE, 0, 0, volume)
##################################################
# Connections
##################################################
self.connect((self.low_pass_filter_0, 0), (self.analog_wfm_rcv_0, 0))
self.connect((self.osmosdr_source_0, 0), (self.wxgui_fftsink2_0, 0))
self.connect((self.blocks_multiply_xx_0, 0), (self.audio_sink_0, 0))
self.connect((self.analog_const_source_x_0, 0), (self.blocks_multiply_xx_0, 1))
self.connect((self.rational_resampler_xxx_0, 0), (self.blocks_multiply_xx_0, 0))
self.connect((self.osmosdr_source_0, 0), (self.low_pass_filter_0, 0))
self.connect((self.analog_wfm_rcv_0, 0), (self.rational_resampler_xxx_0, 0))
def get_volume(self):
return self.volume
def set_volume(self, volume):
self.volume = volume
self.analog_const_source_x_0.set_offset(self.volume)
self._volume_slider.set_value(self.volume)
self._volume_text_box.set_value(self.volume)
def get_sample_rate(self):
return self.sample_rate
def set_sample_rate(self, sample_rate):
self.sample_rate = sample_rate
self.low_pass_filter_0.set_taps(firdes.low_pass(1, self.sample_rate, 100e3, 10e3, firdes.WIN_HAMMING, 6.76))
self.osmosdr_source_0.set_sample_rate(self.sample_rate)
self.wxgui_fftsink2_0.set_sample_rate(self.sample_rate)
def get_freq(self):
return self.freq
def set_freq(self, freq):
self.freq = freq
self.osmosdr_source_0.set_center_freq(self.freq, 0)
self._freq_slider.set_value(self.freq)
self._freq_text_box.set_value(self.freq)
self.wxgui_fftsink2_0.set_baseband_freq(self.freq)
def get_fm_sample(self):
return self.fm_sample
def set_fm_sample(self, fm_sample):
self.fm_sample = fm_sample
def get_audio_rate(self):
return self.audio_rate
def set_audio_rate(self, audio_rate):
self.audio_rate = audio_rate
if __name__ == '__main__':
import ctypes
import sys
if sys.platform.startswith('linux'):
try:
x11 = ctypes.cdll.LoadLibrary('libX11.so')
x11.XInitThreads()
except:
print "Warning: failed to XInitThreads()"
parser = OptionParser(option_class=eng_option, usage="%prog: [options]")
(options, args) = parser.parse_args()
tb = radio()
tb.Start(True)
tb.Wait()Last updated