From 77f6fcffa4b63aed0cc5de87d2b8f7aff00ff2c8 Mon Sep 17 00:00:00 2001 From: Tom Rondeau Date: Sat, 16 Oct 2010 11:46:46 -0400 Subject: Adding a test example for the synthesis filter. --- gnuradio-examples/python/pfb/synth_filter.py | 58 ++++++++++++++++++++++++++++ 1 file changed, 58 insertions(+) create mode 100755 gnuradio-examples/python/pfb/synth_filter.py (limited to 'gnuradio-examples/python/pfb') diff --git a/gnuradio-examples/python/pfb/synth_filter.py b/gnuradio-examples/python/pfb/synth_filter.py new file mode 100755 index 000000000..b1708fde5 --- /dev/null +++ b/gnuradio-examples/python/pfb/synth_filter.py @@ -0,0 +1,58 @@ +#!/usr/bin/env python + +from gnuradio import gr, blks2 +import scipy, pylab + +def main(): + N = 1000000 + fs = 8000 + + #freqs = [100, 200, 300, 400, 500] + freqs = [100,] + nchans = 7 + + sigs = list() + fmtx = list() + for fi in freqs: + s = gr.sig_source_c(fs, gr.GR_SIN_WAVE, fi, 1) + fm = blks2.nbfm_tx (fs, 4*fs, max_dev=10000, tau=75e-6) + sigs.append(s) + fmtx.append(fm) + + taps = gr.firdes.low_pass_2(len(freqs), fs, fs/float(nchans)/2, 100, 100) + print "Num. Taps = %d (taps per filter = %d)" % (len(taps), + len(taps)/nchans) + #filtbank = blks2.synthesis_filterbank(nchans, taps) + filtbank = gr.pfb_synthesis_filterbank_ccf(nchans, taps) + + head = gr.head(gr.sizeof_gr_complex, N) + snk = gr.vector_sink_c() + + tb = gr.top_block() + tb.connect(filtbank, head, snk) + + for i,si in enumerate(sigs): + #tb.connect(si, fmtx[i], (filtbank, i)) + tb.connect(si, (filtbank, i)) + + tb.run() + + if 0: + f1 = pylab.figure(1) + s1 = f1.add_subplot(1,1,1) + s1.plot(snk.data()[1000:]) + + fftlen = 2048 + f2 = pylab.figure(2) + s2 = f2.add_subplot(1,1,1) + winfunc = scipy.blackman + #winfunc = scipy.hamming + s2.psd(snk.data()[10000:], NFFT=fftlen, + Fs = nchans*fs, + noverlap=fftlen/4, + window = lambda d: d*winfunc(fftlen)) + + pylab.show() + +if __name__ == "__main__": + main() -- cgit From 62042813aeeffeeb6091e229761c5068b5ed5cde Mon Sep 17 00:00:00 2001 From: Tom Rondeau Date: Sat, 16 Oct 2010 14:37:55 -0400 Subject: Adding QA code for fir filter with buffer. --- gnuradio-examples/python/pfb/synth_filter.py | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) (limited to 'gnuradio-examples/python/pfb') diff --git a/gnuradio-examples/python/pfb/synth_filter.py b/gnuradio-examples/python/pfb/synth_filter.py index b1708fde5..015ebd668 100755 --- a/gnuradio-examples/python/pfb/synth_filter.py +++ b/gnuradio-examples/python/pfb/synth_filter.py @@ -7,8 +7,7 @@ def main(): N = 1000000 fs = 8000 - #freqs = [100, 200, 300, 400, 500] - freqs = [100,] + freqs = [100, 200, 300, 400, 500] nchans = 7 sigs = list() -- cgit From 80b84262f6fba7da08d888e73e8cb0e981a3a065 Mon Sep 17 00:00:00 2001 From: Tom Rondeau Date: Sat, 16 Oct 2010 17:00:11 -0400 Subject: Work on examples for the synthesize filterbank block. The cleans up the simple example and adds a new example that synthesizes a number of signals and then channelizes them again. It displays the synthesized PSD as well as the PSD and time waveform of one of the channels that's specified in teh code. --- gnuradio-examples/python/pfb/synth_filter.py | 28 +++++-- gnuradio-examples/python/pfb/synth_to_chan.py | 105 ++++++++++++++++++++++++++ 2 files changed, 126 insertions(+), 7 deletions(-) create mode 100755 gnuradio-examples/python/pfb/synth_to_chan.py (limited to 'gnuradio-examples/python/pfb') diff --git a/gnuradio-examples/python/pfb/synth_filter.py b/gnuradio-examples/python/pfb/synth_filter.py index 015ebd668..a1562f9ea 100755 --- a/gnuradio-examples/python/pfb/synth_filter.py +++ b/gnuradio-examples/python/pfb/synth_filter.py @@ -1,4 +1,24 @@ #!/usr/bin/env python +# +# Copyright 2010 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, blks2 import scipy, pylab @@ -11,17 +31,13 @@ def main(): nchans = 7 sigs = list() - fmtx = list() for fi in freqs: s = gr.sig_source_c(fs, gr.GR_SIN_WAVE, fi, 1) - fm = blks2.nbfm_tx (fs, 4*fs, max_dev=10000, tau=75e-6) sigs.append(s) - fmtx.append(fm) taps = gr.firdes.low_pass_2(len(freqs), fs, fs/float(nchans)/2, 100, 100) print "Num. Taps = %d (taps per filter = %d)" % (len(taps), len(taps)/nchans) - #filtbank = blks2.synthesis_filterbank(nchans, taps) filtbank = gr.pfb_synthesis_filterbank_ccf(nchans, taps) head = gr.head(gr.sizeof_gr_complex, N) @@ -31,12 +47,11 @@ def main(): tb.connect(filtbank, head, snk) for i,si in enumerate(sigs): - #tb.connect(si, fmtx[i], (filtbank, i)) tb.connect(si, (filtbank, i)) tb.run() - if 0: + if 1: f1 = pylab.figure(1) s1 = f1.add_subplot(1,1,1) s1.plot(snk.data()[1000:]) @@ -45,7 +60,6 @@ def main(): f2 = pylab.figure(2) s2 = f2.add_subplot(1,1,1) winfunc = scipy.blackman - #winfunc = scipy.hamming s2.psd(snk.data()[10000:], NFFT=fftlen, Fs = nchans*fs, noverlap=fftlen/4, diff --git a/gnuradio-examples/python/pfb/synth_to_chan.py b/gnuradio-examples/python/pfb/synth_to_chan.py new file mode 100755 index 000000000..1beda1a54 --- /dev/null +++ b/gnuradio-examples/python/pfb/synth_to_chan.py @@ -0,0 +1,105 @@ +#!/usr/bin/env python +# +# Copyright 2010 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, blks2 +import scipy, pylab + +def main(): + N = 1000000 + fs = 8000 + + freqs = [100, 200, 300, 400, 500] + nchans = 7 + + sigs = list() + fmtx = list() + for fi in freqs: + s = gr.sig_source_f(fs, gr.GR_SIN_WAVE, fi, 1) + fm = blks2.nbfm_tx (fs, 4*fs, max_dev=10000, tau=75e-6) + sigs.append(s) + fmtx.append(fm) + + syntaps = gr.firdes.low_pass_2(len(freqs), fs, fs/float(nchans)/2, 100, 100) + print "Synthesis Num. Taps = %d (taps per filter = %d)" % (len(syntaps), + len(syntaps)/nchans) + chtaps = gr.firdes.low_pass_2(len(freqs), fs, fs/float(nchans)/2, 100, 100) + print "Channelizer Num. Taps = %d (taps per filter = %d)" % (len(chtaps), + len(chtaps)/nchans) + filtbank = gr.pfb_synthesis_filterbank_ccf(nchans, syntaps) + channelizer = blks2.pfb_channelizer_ccf(nchans, chtaps) + + noise_level = 0.01 + head = gr.head(gr.sizeof_gr_complex, N) + noise = gr.noise_source_c(gr.GR_GAUSSIAN, noise_level) + addnoise = gr.add_cc() + snk_synth = gr.vector_sink_c() + + tb = gr.top_block() + + tb.connect(noise, (addnoise,0)) + tb.connect(filtbank, head, (addnoise, 1)) + tb.connect(addnoise, channelizer) + tb.connect(addnoise, snk_synth) + + snk = list() + for i,si in enumerate(sigs): + tb.connect(si, fmtx[i], (filtbank, i)) + + for i in xrange(nchans): + snk.append(gr.vector_sink_c()) + tb.connect((channelizer, i), snk[i]) + + tb.run() + + if 1: + channel = 1 + data = snk[channel].data()[1000:] + + f1 = pylab.figure(1) + s1 = f1.add_subplot(1,1,1) + s1.plot(data[10000:10200] ) + s1.set_title(("Output Signal from Channel %d" % channel)) + + fftlen = 2048 + winfunc = scipy.blackman + #winfunc = scipy.hamming + + f2 = pylab.figure(2) + s2 = f2.add_subplot(1,1,1) + s2.psd(data, NFFT=fftlen, + Fs = nchans*fs, + noverlap=fftlen/4, + window = lambda d: d*winfunc(fftlen)) + s2.set_title(("Output PSD from Channel %d" % channel)) + + f3 = pylab.figure(3) + s3 = f3.add_subplot(1,1,1) + s3.psd(snk_synth.data()[1000:], NFFT=fftlen, + Fs = nchans*fs, + noverlap=fftlen/4, + window = lambda d: d*winfunc(fftlen)) + s3.set_title("Output of Synthesis Filter") + + pylab.show() + +if __name__ == "__main__": + main() -- cgit