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#!/usr/bin/env python
#
# Copyright 2009,2010,2012 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
import filter_swig as filter
import optfir
class channelizer_ccf(gr.hier_block2):
'''
Make a Polyphase Filter channelizer (complex in, complex out, floating-point taps)
This simplifies the interface by allowing a single input stream to connect to this block.
It will then output a stream for each channel.
'''
def __init__(self, numchans, taps=None, oversample_rate=1, atten=100):
gr.hier_block2.__init__(self, "pfb_channelizer_ccf",
gr.io_signature(1, 1, gr.sizeof_gr_complex),
gr.io_signature(numchans, numchans, gr.sizeof_gr_complex))
self._nchans = numchans
self._oversample_rate = oversample_rate
if taps is not None:
self._taps = taps
else:
# Create a filter that covers the full bandwidth of the input signal
bw = 0.4
tb = 0.2
ripple = 0.1
made = False
while not made:
try:
self._taps = optfir.low_pass(1, self._nchans, bw, bw+tb, ripple, atten)
made = True
except RuntimeError:
ripple += 0.01
made = False
print("Warning: set ripple to %.4f dB. If this is a problem, adjust the attenuation or create your own filter taps." % (ripple))
# Build in an exit strategy; if we've come this far, it ain't working.
if(ripple >= 1.0):
raise RuntimeError("optfir could not generate an appropriate filter.")
self.s2ss = gr.stream_to_streams(gr.sizeof_gr_complex, self._nchans)
self.pfb = filter.pfb_channelizer_ccf(self._nchans, self._taps,
self._oversample_rate)
self.connect(self, self.s2ss)
for i in xrange(self._nchans):
self.connect((self.s2ss,i), (self.pfb,i))
self.connect((self.pfb,i), (self,i))
def set_channel_map(self, newmap):
self.pfb.set_channel_map(newmap)
class interpolator_ccf(gr.hier_block2):
'''
Make a Polyphase Filter interpolator (complex in, complex out, floating-point taps)
The block takes a single complex stream in and outputs a single complex
stream out. As such, it requires no extra glue to handle the input/output
streams. This block is provided to be consistent with the interface to the
other PFB block.
'''
def __init__(self, interp, taps=None, atten=100):
gr.hier_block2.__init__(self, "pfb_interpolator_ccf",
gr.io_signature(1, 1, gr.sizeof_gr_complex),
gr.io_signature(1, 1, gr.sizeof_gr_complex))
self._interp = interp
self._taps = taps
if taps is not None:
self._taps = taps
else:
# Create a filter that covers the full bandwidth of the input signal
bw = 0.4
tb = 0.2
ripple = 0.99
made = False
while not made:
try:
self._taps = optfir.low_pass(self._interp, self._interp, bw, bw+tb, ripple, atten)
made = True
except RuntimeError:
ripple += 0.01
made = False
print("Warning: set ripple to %.4f dB. If this is a problem, adjust the attenuation or create your own filter taps." % (ripple))
# Build in an exit strategy; if we've come this far, it ain't working.
if(ripple >= 1.0):
raise RuntimeError("optfir could not generate an appropriate filter.")
self.pfb = filter.pfb_interpolator_ccf(self._interp, self._taps)
self.connect(self, self.pfb)
self.connect(self.pfb, self)
class decimator_ccf(gr.hier_block2):
'''
Make a Polyphase Filter decimator (complex in, complex out, floating-point taps)
This simplifies the interface by allowing a single input stream to connect to this block.
It will then output a stream that is the decimated output stream.
'''
def __init__(self, decim, taps=None, channel=0, atten=100):
gr.hier_block2.__init__(self, "pfb_decimator_ccf",
gr.io_signature(1, 1, gr.sizeof_gr_complex),
gr.io_signature(1, 1, gr.sizeof_gr_complex))
self._decim = decim
self._channel = channel
if taps is not None:
self._taps = taps
else:
# Create a filter that covers the full bandwidth of the input signal
bw = 0.4
tb = 0.2
ripple = 0.1
made = False
while not made:
try:
self._taps = optfir.low_pass(1, self._decim, bw, bw+tb, ripple, atten)
made = True
except RuntimeError:
ripple += 0.01
made = False
print("Warning: set ripple to %.4f dB. If this is a problem, adjust the attenuation or create your own filter taps." % (ripple))
# Build in an exit strategy; if we've come this far, it ain't working.
if(ripple >= 1.0):
raise RuntimeError("optfir could not generate an appropriate filter.")
self.s2ss = gr.stream_to_streams(gr.sizeof_gr_complex, self._decim)
self.pfb = filter.pfb_decimator_ccf(self._decim, self._taps, self._channel)
self.connect(self, self.s2ss)
for i in xrange(self._decim):
self.connect((self.s2ss,i), (self.pfb,i))
self.connect(self.pfb, self)
class arb_resampler_ccf(gr.hier_block2):
'''
Convenience wrapper for the polyphase filterbank arbitrary resampler.
The block takes a single complex stream in and outputs a single complex
stream out. As such, it requires no extra glue to handle the input/output
streams. This block is provided to be consistent with the interface to the
other PFB block.
'''
def __init__(self, rate, taps=None, flt_size=32, atten=100):
gr.hier_block2.__init__(self, "pfb_arb_resampler_ccf",
gr.io_signature(1, 1, gr.sizeof_gr_complex), # Input signature
gr.io_signature(1, 1, gr.sizeof_gr_complex)) # Output signature
self._rate = rate
self._size = flt_size
if taps is not None:
self._taps = taps
else:
# Create a filter that covers the full bandwidth of the input signal
bw = 0.4
tb = 0.2
ripple = 0.1
#self._taps = filter.firdes.low_pass_2(self._size, self._size, bw, tb, atten)
made = False
while not made:
try:
self._taps = optfir.low_pass(self._size, self._size, bw, bw+tb, ripple, atten)
made = True
except RuntimeError:
ripple += 0.01
made = False
print("Warning: set ripple to %.4f dB. If this is a problem, adjust the attenuation or create your own filter taps." % (ripple))
# Build in an exit strategy; if we've come this far, it ain't working.
if(ripple >= 1.0):
raise RuntimeError("optfir could not generate an appropriate filter.")
self.pfb = filter.pfb_arb_resampler_ccf(self._rate, self._taps, self._size)
#print "PFB has %d taps\n" % (len(self._taps),)
self.connect(self, self.pfb)
self.connect(self.pfb, self)
# Note -- set_taps not implemented in base class yet
def set_taps(self, taps):
self.pfb.set_taps(taps)
def set_rate(self, rate):
self.pfb.set_rate(rate)
class arb_resampler_fff(gr.hier_block2):
'''
Convenience wrapper for the polyphase filterbank arbitrary resampler.
The block takes a single float stream in and outputs a single float
stream out. As such, it requires no extra glue to handle the input/output
streams. This block is provided to be consistent with the interface to the
other PFB block.
'''
def __init__(self, rate, taps=None, flt_size=32, atten=100):
gr.hier_block2.__init__(self, "pfb_arb_resampler_fff",
gr.io_signature(1, 1, gr.sizeof_float), # Input signature
gr.io_signature(1, 1, gr.sizeof_float)) # Output signature
self._rate = rate
self._size = flt_size
if taps is not None:
self._taps = taps
else:
# Create a filter that covers the full bandwidth of the input signal
bw = 0.4
tb = 0.2
ripple = 0.1
#self._taps = filter.firdes.low_pass_2(self._size, self._size, bw, tb, atten)
made = False
while not made:
try:
self._taps = optfir.low_pass(self._size, self._size, bw, bw+tb, ripple, atten)
made = True
except RuntimeError:
ripple += 0.01
made = False
print("Warning: set ripple to %.4f dB. If this is a problem, adjust the attenuation or create your own filter taps." % (ripple))
# Build in an exit strategy; if we've come this far, it ain't working.
if(ripple >= 1.0):
raise RuntimeError("optfir could not generate an appropriate filter.")
self.pfb = filter.pfb_arb_resampler_fff(self._rate, self._taps, self._size)
#print "PFB has %d taps\n" % (len(self._taps),)
self.connect(self, self.pfb)
self.connect(self.pfb, self)
# Note -- set_taps not implemented in base class yet
def set_taps(self, taps):
self.pfb.set_taps(taps)
def set_rate(self, rate):
self.pfb.set_rate(rate)
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