diff options
Diffstat (limited to 'gr-uhd/apps/hf_radio/ssbdemod.py')
| -rw-r--r-- | gr-uhd/apps/hf_radio/ssbdemod.py | 116 |
1 files changed, 0 insertions, 116 deletions
diff --git a/gr-uhd/apps/hf_radio/ssbdemod.py b/gr-uhd/apps/hf_radio/ssbdemod.py deleted file mode 100644 index 3c533f617..000000000 --- a/gr-uhd/apps/hf_radio/ssbdemod.py +++ /dev/null @@ -1,116 +0,0 @@ -# Copyright 2011 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. -# - -# This tries to push the hilbert transform for ssb demod back into the -# freq. xlating filter. -# -# The starting point for this was weaver_isb_am1_usrp3.py. -# -# The tap coefficients for freq_xlating_fir_filter_ccf were generated -# externally and are read from a file because I didn't want to learn how -# to make fir filters with arbitrary phase response using python numeric -# facilities. -# -# They were generated using Scilab which I am already familiar with. -# M. Revnell Jan 06 - -from gnuradio import gr - -class ssb_demod( gr.hier_block2 ): - def __init__( self, if_rate, af_rate ): - gr.hier_block2.__init__(self, "ssb_demod", - gr.io_signature(1,1,gr.sizeof_gr_complex), - gr.io_signature(1,1,gr.sizeof_float)) - - self.if_rate = int(if_rate) - self.af_rate = int(af_rate) - self.if_decim = int(if_rate / af_rate) - self.sideband = 1 - - self.xlate_taps = ([complex(v) for v in file('ssb_taps').readlines()]) - - self.audio_taps = gr.firdes.low_pass( - 1.0, - self.af_rate, - 3e3, - 600, - gr.firdes.WIN_HAMMING ) - - self.xlate = gr.freq_xlating_fir_filter_ccc( - self.if_decim, - self.xlate_taps, - 0, - self.if_rate ) - - self.split = gr.complex_to_float() - - self.lpf = gr.fir_filter_fff( - 1, self.audio_taps ) - - self.sum = gr.add_ff( ) - self.am_sel = gr.multiply_const_ff( 0 ) - self.sb_sel = gr.multiply_const_ff( 1 ) - self.mixer = gr.add_ff() - self.am_det = gr.complex_to_mag() - - self.connect(self, self.xlate) - self.connect(self.xlate, self.split) - self.connect((self.split, 0), (self.sum, 0)) - self.connect((self.split, 1), (self.sum, 1)) - self.connect(self.sum, self.sb_sel) - self.connect(self.xlate, self.am_det) - self.connect(self.sb_sel, (self.mixer, 0)) - self.connect(self.am_det, self.am_sel) - self.connect(self.am_sel, (self.mixer, 1)) - self.connect(self.mixer, self.lpf) - self.connect(self.lpf, self) - - def upper_sb( self ): - self.xlate.set_taps([v.conjugate() for v in self.xlate_taps]) - self.sb_sel.set_k( 1.0 ) - self.am_sel.set_k( 0.0 ) - - def lower_sb( self ): - self.xlate.set_taps(self.xlate_taps) - self.sb_sel.set_k( 1.0 ) - self.am_sel.set_k( 0.0 ) - - def set_am( self ): - taps = gr.firdes.low_pass( 1.0, - self.if_rate, - 5e3, - 2e3, - gr.firdes.WIN_HAMMING ) - self.xlate.set_taps( taps ) - self.sb_sel.set_k( 0.0 ) - self.am_sel.set_k( 1.0 ) - - def set_bw( self, bw ): - self.audio_taps = gr.firdes.low_pass( - 1.0, - self.af_rate, - bw, - 600, - gr.firdes.WIN_HAMMING ) - self.lpf.set_taps( self.audio_taps ) - - def tune( self, freq ): - self.xlate.set_center_freq( freq ) - |