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-rw-r--r--gnuradio-examples/python/apps/hf_radio/ssbdemod.py97
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diff --git a/gnuradio-examples/python/apps/hf_radio/ssbdemod.py b/gnuradio-examples/python/apps/hf_radio/ssbdemod.py
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--- a/gnuradio-examples/python/apps/hf_radio/ssbdemod.py
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@@ -1,97 +0,0 @@
-# This tries to push the hilbert transform for ssb demod back into the
-# freq. xlating filter.
-#
-# The usual gnuradio copyright notice is hereby included by reference.
-#
-# 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, gru
-from gnuradio import audio
-from gnuradio import usrp
-
-class ssb_demod( gr.hier_block ):
- def __init__( self, fg, if_rate, af_rate ):
-
- self.if_rate = if_rate
- self.af_rate = af_rate
- self.if_decim = 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()
-
- fg.connect( self.xlate, self.split )
- fg.connect( ( self.split,0 ), ( self.sum,0 ) )
- fg.connect( ( self.split,1 ), ( self.sum,1 ) )
- fg.connect( self.sum, self.sb_sel )
- fg.connect( self.xlate, self.am_det )
- fg.connect( self.sb_sel, ( self.mixer, 0 ) )
- fg.connect( self.am_det, self.am_sel )
- fg.connect( self.am_sel, ( self.mixer, 1 ) )
- fg.connect( self.mixer, self.lpf )
-
- gr.hier_block.__init__( self, fg, self.xlate, self.lpf )
-
- 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 )
-