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/nbfm_rx.py | |
| parent | e8b4e619479dd23d87c3aef042f2452f867a1e18 (diff) | |
analog: Enabling uninstalled python imports.
Diffstat (limited to 'gr-analog/python/nbfm_rx.py')
| -rw-r--r-- | gr-analog/python/nbfm_rx.py | 90 |
1 files changed, 0 insertions, 90 deletions
diff --git a/gr-analog/python/nbfm_rx.py b/gr-analog/python/nbfm_rx.py deleted file mode 100644 index b2c86db70f..0000000000 --- a/gr-analog/python/nbfm_rx.py +++ /dev/null @@ -1,90 +0,0 @@ -# -# Copyright 2005,2012 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. -# - -import math -from gnuradio import gr -from gnuradio import filter -from fm_emph import fm_deemph - -try: - from gnuradio import analog -except ImportError: - import analog_swig as analog - -class nbfm_rx(gr.hier_block2): - def __init__(self, audio_rate, quad_rate, tau=75e-6, max_dev=5e3): - """ - Narrow Band FM Receiver. - - Takes a single complex baseband input stream and produces a single - float output stream of audio sample in the range [-1, +1]. - - Args: - audio_rate: sample rate of audio stream, >= 16k (integer) - quad_rate: sample rate of output stream (integer) - tau: preemphasis time constant (default 75e-6) (float) - max_dev: maximum deviation in Hz (default 5e3) (float) - - quad_rate must be an integer multiple of audio_rate. - - Exported sub-blocks (attributes): - squelch - quad_demod - deemph - audio_filter - """ - - gr.hier_block2.__init__(self, "nbfm_rx", - gr.io_signature(1, 1, gr.sizeof_gr_complex), # Input signature - gr.io_signature(1, 1, gr.sizeof_float)) # Output signature - - # FIXME audio_rate and quad_rate ought to be exact rationals - audio_rate = int(audio_rate) - quad_rate = int(quad_rate) - - if quad_rate % audio_rate != 0: - raise ValueError, "quad_rate is not an integer multiple of audio_rate" - - squelch_threshold = 20 # dB - #self.squelch = analog.simple_squelch_cc(squelch_threshold, 0.001) - - # FM Demodulator input: complex; output: float - k = quad_rate/(2*math.pi*max_dev) - self.quad_demod = analog.quadrature_demod_cf(k) - - # FM Deemphasis IIR filter - self.deemph = fm_deemph(quad_rate, tau=tau) - - # compute FIR taps for audio filter - audio_decim = quad_rate // audio_rate - audio_taps = filter.firdes.low_pass(1.0, # gain - quad_rate, # sampling rate - 2.7e3, # Audio LPF cutoff - 0.5e3, # Transition band - filter.firdes.WIN_HAMMING) # filter type - - print "len(audio_taps) =", len(audio_taps) - - # Decimating audio filter - # input: float; output: float; taps: float - self.audio_filter = filter.fir_filter_fff(audio_decim, audio_taps) - - self.connect(self, self.quad_demod, self.deemph, self.audio_filter, self) |