diff options
| author | Ben Reynwar <ben@reynwar.net> | 2013-03-07 23:27:44 -0700 |
|---|---|---|
| committer | Ben Reynwar <ben@reynwar.net> | 2013-03-07 23:27:44 -0700 |
| commit | ae30f247616b6229fb304e30fecf3f82ae09dbf6 (patch) | |
| tree | 74c1d6cd8300b44b6280c56bc4ad257c40390b3e /gr-analog/python/fm_demod.py | |
| parent | e8b4e619479dd23d87c3aef042f2452f867a1e18 (diff) | |
analog: Enabling uninstalled python imports.
Diffstat (limited to 'gr-analog/python/fm_demod.py')
| -rw-r--r-- | gr-analog/python/fm_demod.py | 108 |
1 files changed, 0 insertions, 108 deletions
diff --git a/gr-analog/python/fm_demod.py b/gr-analog/python/fm_demod.py deleted file mode 100644 index 1976a076ca..0000000000 --- a/gr-analog/python/fm_demod.py +++ /dev/null @@ -1,108 +0,0 @@ -# -# Copyright 2006,2007,2012 Free Software Foundation, Inc. -# -# This file is part of GNU Radio -# -# GNU Radio is free software; you can redistribute it and/or modify -# it under the terms of the GNU General Public License as published by -# the Free Software Foundation; either version 3, or (at your option) -# any later version. -# -# GNU Radio is distributed in the hope that it will be useful, -# but WITHOUT ANY WARRANTY; without even the implied warranty of -# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -# GNU General Public License for more details. -# -# You should have received a copy of the GNU General Public License -# along with GNU Radio; see the file COPYING. If not, write to -# the Free Software Foundation, Inc., 51 Franklin Street, -# Boston, MA 02110-1301, USA. -# - -from gnuradio import gr, filter -from fm_emph import fm_deemph -from math import pi - -try: - from gnuradio import analog -except ImportError: - import analog_swig as analog - -class fm_demod_cf(gr.hier_block2): - """ - Generalized FM demodulation block with deemphasis and audio - filtering. - - This block demodulates a band-limited, complex down-converted FM - channel into the the original baseband signal, optionally applying - deemphasis. Low pass filtering is done on the resultant signal. It - produces an output float strem in the range of [-1.0, +1.0]. - - Args: - channel_rate: incoming sample rate of the FM baseband (integer) - deviation: maximum FM deviation (default = 5000) (float) - audio_decim: input to output decimation rate (integer) - audio_pass: audio low pass filter passband frequency (float) - audio_stop: audio low pass filter stop frequency (float) - gain: gain applied to audio output (default = 1.0) (float) - tau: deemphasis time constant (default = 75e-6), specify 'None' to prevent deemphasis - """ - def __init__(self, channel_rate, audio_decim, deviation, - audio_pass, audio_stop, gain=1.0, tau=75e-6): - gr.hier_block2.__init__(self, "fm_demod_cf", - gr.io_signature(1, 1, gr.sizeof_gr_complex), # Input signature - gr.io_signature(1, 1, gr.sizeof_float)) # Output signature - - k = channel_rate/(2*pi*deviation) - QUAD = analog.quadrature_demod_cf(k) - - audio_taps = filter.optfir.low_pass(gain, # Filter gain - channel_rate, # Sample rate - audio_pass, # Audio passband - audio_stop, # Audio stopband - 0.1, # Passband ripple - 60) # Stopband attenuation - LPF = filter.fir_filter_fff(audio_decim, audio_taps) - - if tau is not None: - DEEMPH = fm_deemph(channel_rate, tau) - self.connect(self, QUAD, DEEMPH, LPF, self) - else: - self.connect(self, QUAD, LPF, self) - -class demod_20k0f3e_cf(fm_demod_cf): - """ - NBFM demodulation block, 20 KHz channels - - This block demodulates a complex, downconverted, narrowband FM - channel conforming to 20K0F3E emission standards, outputting - floats in the range [-1.0, +1.0]. - - Args: - sample_rate: incoming sample rate of the FM baseband (integer) - audio_decim: input to output decimation rate (integer) - """ - def __init__(self, channel_rate, audio_decim): - fm_demod_cf.__init__(self, channel_rate, audio_decim, - 5000, # Deviation - 3000, # Audio passband frequency - 4500) # Audio stopband frequency - -class demod_200kf3e_cf(fm_demod_cf): - """ - WFM demodulation block, mono. - - This block demodulates a complex, downconverted, wideband FM - channel conforming to 200KF3E emission standards, outputting - floats in the range [-1.0, +1.0]. - - Args: - sample_rate: incoming sample rate of the FM baseband (integer) - audio_decim: input to output decimation rate (integer) - """ - def __init__(self, channel_rate, audio_decim): - fm_demod_cf.__init__(self, channel_rate, audio_decim, - 75000, # Deviation - 15000, # Audio passband - 16000, # Audio stopband - 20.0) # Audio gain |