3 * Copyright 2009 Free Software Foundation, Inc.
5 * This file is part of GNU Radio
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8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 3, or (at your option)
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13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with GNU Radio; see the file COPYING. If not, write to
19 * the Free Software Foundation, Inc., 51 Franklin Street,
20 * Boston, MA 02110-1301, USA.
27 #include <gr_pfb_interpolator_ccf.h>
28 #include <gr_fir_ccf.h>
29 #include <gr_fir_util.h>
30 #include <gr_io_signature.h>
32 gr_pfb_interpolator_ccf_sptr gr_make_pfb_interpolator_ccf (unsigned int interp,
33 const std::vector<float> &taps)
35 return gr_pfb_interpolator_ccf_sptr (new gr_pfb_interpolator_ccf (interp, taps));
39 gr_pfb_interpolator_ccf::gr_pfb_interpolator_ccf (unsigned int interp,
40 const std::vector<float> &taps)
41 : gr_sync_interpolator ("pfb_interpolator_ccf",
42 gr_make_io_signature (1, 1, sizeof(gr_complex)),
43 gr_make_io_signature (1, 1, sizeof(gr_complex)),
48 d_filters = std::vector<gr_fir_ccf*>(d_rate);
50 // Create an FIR filter for each channel and zero out the taps
51 std::vector<float> vtaps(0, d_rate);
52 for(unsigned int i = 0; i < d_rate; i++) {
53 d_filters[i] = gr_fir_util::create_gr_fir_ccf(vtaps);
56 // Now, actually set the filters' taps
60 gr_pfb_interpolator_ccf::~gr_pfb_interpolator_ccf ()
62 for(unsigned int i = 0; i < d_rate; i++) {
68 gr_pfb_interpolator_ccf::set_taps (const std::vector<float> &taps)
72 unsigned int ntaps = taps.size();
73 d_taps_per_filter = (unsigned int)ceil((double)ntaps/(double)d_rate);
75 // Create d_numchan vectors to store each channel's taps
76 //std::vector< std::vector<float> > vtaps(d_rate);
77 d_taps.resize(d_rate);
79 // Make a vector of the taps plus fill it out with 0's to fill
80 // each polyphase filter with exactly d_taps_per_filter
81 std::vector<float> tmp_taps;
83 while((float)(tmp_taps.size()) < d_rate*d_taps_per_filter) {
84 tmp_taps.push_back(0.0);
87 // Partition the filter
88 for(i = 0; i < d_rate; i++) {
89 // Each channel uses all d_taps_per_filter with 0's if not enough taps to fill out
90 d_taps[i] = std::vector<float>(d_taps_per_filter, 0);
91 for(j = 0; j < d_taps_per_filter; j++) {
92 d_taps[i][j] = tmp_taps[i + j*d_rate]; // add taps to channels in reverse order
95 // Build a filter for each channel and add it's taps to it
96 d_filters[i]->set_taps(d_taps[i]);
99 // Set the history to ensure enough input items for each filter
100 set_history (d_taps_per_filter);
106 gr_pfb_interpolator_ccf::print_taps()
109 for(i = 0; i < d_rate; i++) {
110 printf("filter[%d]: [", i);
111 for(j = 0; j < d_taps_per_filter; j++) {
112 printf(" %.4e", d_taps[i][j]);
119 gr_pfb_interpolator_ccf::work (int noutput_items,
120 gr_vector_const_void_star &input_items,
121 gr_vector_void_star &output_items)
123 gr_complex *in = (gr_complex *) input_items[0];
124 gr_complex *out = (gr_complex *) output_items[0];
128 return 0; // history requirements may have changed.
131 int i = 0, count = 0;
133 while(i < noutput_items) {
134 for(int j = 0; j < d_rate; j++) {
135 out[i] = d_filters[j]->filter(&in[count]);