3 * Copyright 2009,2010 Free Software Foundation, Inc.
5 * This file is part of GNU Radio
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15 * GNU General Public License for more details.
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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>
33 gr_pfb_interpolator_ccf_sptr gr_make_pfb_interpolator_ccf (unsigned int interp,
34 const std::vector<float> &taps)
36 return gnuradio::get_initial_sptr(new gr_pfb_interpolator_ccf (interp, taps));
40 gr_pfb_interpolator_ccf::gr_pfb_interpolator_ccf (unsigned int interp,
41 const std::vector<float> &taps)
42 : gr_sync_interpolator ("pfb_interpolator_ccf",
43 gr_make_io_signature (1, 1, sizeof(gr_complex)),
44 gr_make_io_signature (1, 1, sizeof(gr_complex)),
49 d_filters = std::vector<gr_fir_ccf*>(d_rate);
51 // Create an FIR filter for each channel and zero out the taps
52 std::vector<float> vtaps(0, d_rate);
53 for(unsigned int i = 0; i < d_rate; i++) {
54 d_filters[i] = gr_fir_util::create_gr_fir_ccf(vtaps);
57 // Now, actually set the filters' taps
61 gr_pfb_interpolator_ccf::~gr_pfb_interpolator_ccf ()
63 for(unsigned int i = 0; i < d_rate; i++) {
69 gr_pfb_interpolator_ccf::set_taps (const std::vector<float> &taps)
73 unsigned int ntaps = taps.size();
74 d_taps_per_filter = (unsigned int)ceil((double)ntaps/(double)d_rate);
76 // Create d_numchan vectors to store each channel's taps
77 //std::vector< std::vector<float> > vtaps(d_rate);
78 d_taps.resize(d_rate);
80 // Make a vector of the taps plus fill it out with 0's to fill
81 // each polyphase filter with exactly d_taps_per_filter
82 std::vector<float> tmp_taps;
84 while((float)(tmp_taps.size()) < d_rate*d_taps_per_filter) {
85 tmp_taps.push_back(0.0);
88 // Partition the filter
89 for(i = 0; i < d_rate; i++) {
90 // Each channel uses all d_taps_per_filter with 0's if not enough taps to fill out
91 d_taps[i] = std::vector<float>(d_taps_per_filter, 0);
92 for(j = 0; j < d_taps_per_filter; j++) {
93 d_taps[i][j] = tmp_taps[i + j*d_rate]; // add taps to channels in reverse order
96 // Build a filter for each channel and add it's taps to it
97 d_filters[i]->set_taps(d_taps[i]);
100 // Set the history to ensure enough input items for each filter
101 set_history (d_taps_per_filter);
107 gr_pfb_interpolator_ccf::print_taps()
110 for(i = 0; i < d_rate; i++) {
111 printf("filter[%d]: [", i);
112 for(j = 0; j < d_taps_per_filter; j++) {
113 printf(" %.4e", d_taps[i][j]);
120 gr_pfb_interpolator_ccf::work (int noutput_items,
121 gr_vector_const_void_star &input_items,
122 gr_vector_void_star &output_items)
124 gr_complex *in = (gr_complex *) input_items[0];
125 gr_complex *out = (gr_complex *) output_items[0];
129 return 0; // history requirements may have changed.
132 int i = 0, count = 0;
134 while(i < noutput_items) {
135 for(int j = 0; j < d_rate; j++) {
136 out[i] = d_filters[j]->filter(&in[count]);