3 * Copyright 2009 Free Software Foundation, Inc.
5 * This file is part of GNU Radio
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30 #include <gr_pfb_clock_sync_ccf.h>
31 #include <gr_fir_ccf.h>
32 #include <gr_fir_util.h>
33 #include <gr_io_signature.h>
36 gr_pfb_clock_sync_ccf_sptr gr_make_pfb_clock_sync_ccf (float sps, float gain,
37 const std::vector<float> &taps,
38 unsigned int filter_size,
41 return gr_pfb_clock_sync_ccf_sptr (new gr_pfb_clock_sync_ccf (sps, gain, taps,
46 int ios[] = {sizeof(gr_complex), sizeof(float), sizeof(float), sizeof(float)};
47 std::vector<int> iosig(ios, ios+sizeof(ios)/sizeof(int));
48 gr_pfb_clock_sync_ccf::gr_pfb_clock_sync_ccf (float sps, float gain,
49 const std::vector<float> &taps,
50 unsigned int filter_size,
52 : gr_block ("pfb_clock_sync_ccf",
53 gr_make_io_signature (1, 1, sizeof(gr_complex)),
54 gr_make_io_signaturev (1, 4, iosig)),
55 d_updated (false), d_sps(sps)
57 d_nfilters = filter_size;
59 // Store the last filter between calls to work
60 // The accumulator keeps track of overflow to increment the stride correctly.
61 // set it here to the fractional difference based on the initial phaes
62 // assert(init_phase <= 2*M_PI);
69 d_filters = std::vector<gr_fir_ccf*>(d_nfilters);
70 d_diff_filters = std::vector<gr_fir_ccf*>(d_nfilters);
72 // Create an FIR filter for each channel and zero out the taps
73 std::vector<float> vtaps(0, d_nfilters);
74 for(unsigned int i = 0; i < d_nfilters; i++) {
75 d_filters[i] = gr_fir_util::create_gr_fir_ccf(vtaps);
76 d_diff_filters[i] = gr_fir_util::create_gr_fir_ccf(vtaps);
79 // Now, actually set the filters' taps
80 std::vector<float> dtaps;
81 create_diff_taps(taps, dtaps);
82 set_taps(taps, d_taps, d_filters);
83 set_taps(dtaps, d_dtaps, d_diff_filters);
86 gr_pfb_clock_sync_ccf::~gr_pfb_clock_sync_ccf ()
88 for(unsigned int i = 0; i < d_nfilters; i++) {
94 gr_pfb_clock_sync_ccf::set_taps (const std::vector<float> &newtaps,
95 std::vector< std::vector<float> > &ourtaps,
96 std::vector<gr_fir_ccf*> &ourfilter)
100 unsigned int ntaps = newtaps.size();
101 d_taps_per_filter = (unsigned int)ceil((double)ntaps/(double)d_nfilters);
103 // Create d_numchan vectors to store each channel's taps
104 ourtaps.resize(d_nfilters);
106 // Make a vector of the taps plus fill it out with 0's to fill
107 // each polyphase filter with exactly d_taps_per_filter
108 std::vector<float> tmp_taps;
110 while((float)(tmp_taps.size()) < d_nfilters*d_taps_per_filter) {
111 tmp_taps.push_back(0.0);
114 // Partition the filter
115 for(i = 0; i < d_nfilters; i++) {
116 // Each channel uses all d_taps_per_filter with 0's if not enough taps to fill out
117 ourtaps[i] = std::vector<float>(d_taps_per_filter, 0);
118 for(j = 0; j < d_taps_per_filter; j++) {
119 ourtaps[i][j] = tmp_taps[i + j*d_nfilters]; // add taps to channels in reverse order
122 // Build a filter for each channel and add it's taps to it
123 ourfilter[i]->set_taps(ourtaps[i]);
126 // Set the history to ensure enough input items for each filter
127 set_history (d_taps_per_filter + d_sps);
133 gr_pfb_clock_sync_ccf::create_diff_taps(const std::vector<float> &newtaps,
134 std::vector<float> &difftaps)
136 float maxtap = -1e12;
138 difftaps.push_back(0); //newtaps[0]);
139 for(unsigned int i = 1; i < newtaps.size()-1; i++) {
140 float tap = newtaps[i+1] - newtaps[i-1];
145 difftaps.push_back(tap);
147 difftaps.push_back(0);//-newtaps[newtaps.size()-1]);
149 for(unsigned int i = 0; i < difftaps.size(); i++) {
150 difftaps[i] /= 1;//maxtap;
155 gr_pfb_clock_sync_ccf::print_taps()
158 for(i = 0; i < d_nfilters; i++) {
159 printf("filter[%d]: [%.4e, ", i, d_taps[i][0]);
160 for(j = 1; j < d_taps_per_filter-1; j++) {
161 printf("%.4e,", d_taps[i][j]);
163 printf("%.4e]\n", d_taps[i][j]);
168 gr_pfb_clock_sync_ccf::print_diff_taps()
171 for(i = 0; i < d_nfilters; i++) {
172 printf("filter[%d]: [%.4e, ", i, d_dtaps[i][0]);
173 for(j = 1; j < d_taps_per_filter-1; j++) {
174 printf("%.4e,", d_dtaps[i][j]);
176 printf("%.4e]\n", d_dtaps[i][j]);
182 gr_pfb_clock_sync_ccf::channel_taps(int channel)
184 std::vector<float> taps;
186 for(i = 0; i < d_taps_per_filter; i++) {
187 taps.push_back(d_taps[channel][i]);
193 gr_pfb_clock_sync_ccf::diff_channel_taps(int channel)
195 std::vector<float> taps;
197 for(i = 0; i < d_taps_per_filter; i++) {
198 taps.push_back(d_dtaps[channel][i]);
205 gr_pfb_clock_sync_ccf::general_work (int noutput_items,
206 gr_vector_int &ninput_items,
207 gr_vector_const_void_star &input_items,
208 gr_vector_void_star &output_items)
210 gr_complex *in = (gr_complex *) input_items[0];
211 gr_complex *out = (gr_complex *) output_items[0];
213 float *err, *outrate, *outk;
214 if(output_items.size() > 2) {
215 err = (float *) output_items[1];
216 outrate = (float*)output_items[2];
217 outk = (float*)output_items[3];
222 return 0; // history requirements may have changed.
225 // We need this many to process one output
226 int nrequired = ninput_items[0] - d_taps_per_filter;
228 int i = 0, count = d_start_count;
231 // produce output as long as we can and there are enough input samples
232 while((i < noutput_items) && (count < nrequired)) {
233 int filtnum = (int)d_k;
234 out[i] = d_filters[filtnum]->filter(&in[count]);
235 error = (out[i] * d_diff_filters[filtnum]->filter(&in[count])).real();
237 d_k = d_k + d_alpha*error + d_rate;
238 d_rate = d_rate + d_beta*error;
239 while(d_k >= d_nfilters) {
251 if(output_items.size() > 2) {
257 //printf("error: %f k: %f rate: %f\n",
258 // error, d_k, d_rate);
261 // Set the start index at the next entrance to the work function
262 // if we stop because we run out of input items, jump ahead in the
263 // next call to work. Otherwise, we can start at zero.
264 if(count > nrequired) {
265 d_start_count = count - (nrequired);
266 consume_each(ninput_items[0]-d_taps_per_filter);