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* Copyright 2007 Free Software Foundation, Inc.
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* This file is part of GNU Radio
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* GNU Radio is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3, or (at your option)
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* GNU Radio is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with GNU Radio; see the file COPYING. If not, write to
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* the Free Software Foundation, Inc., 51 Franklin Street,
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* Boston, MA 02110-1301, USA.
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#include <gr_io_signature.h>
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gr_make_@BASE_NAME@ (float threshold_factor_rise,
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float threshold_factor_fall,
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int look_ahead, float alpha)
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return @SPTR_NAME@ (new @NAME@ (threshold_factor_rise,
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threshold_factor_fall,
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@NAME@::@NAME@ (float threshold_factor_rise,
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float threshold_factor_fall,
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int look_ahead, float alpha)
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: gr_sync_block ("@BASE_NAME@",
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gr_make_io_signature (1, 1, sizeof (@I_TYPE@)),
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gr_make_io_signature (1, 1, sizeof (char))),
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d_threshold_factor_rise(threshold_factor_rise),
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d_threshold_factor_fall(threshold_factor_fall),
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d_look_ahead(look_ahead), d_avg_alpha(alpha), d_avg(0), d_found(0)
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@NAME@::work (int noutput_items,
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gr_vector_const_void_star &input_items,
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gr_vector_void_star &output_items)
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@I_TYPE@ *iptr = (@I_TYPE@ *) input_items[0];
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char *optr = (char *) output_items[0];
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memset(optr, 0, noutput_items*sizeof(char));
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@I_TYPE@ peak_val = -(@I_TYPE@)INFINITY;
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unsigned char state = 0;
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//printf("noutput_items %d\n",noutput_items);
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while(i < noutput_items) {
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if(state == 0) { // below threshold
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if(iptr[i] > d_avg*d_threshold_factor_rise) {
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d_avg = (d_avg_alpha)*iptr[i] + (1-d_avg_alpha)*d_avg;
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else if(state == 1) { // above threshold, have not found peak
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//printf("Entered State 1: %f i: %d noutput_items: %d\n", iptr[i], i, noutput_items);
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if(iptr[i] > peak_val) {
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d_avg = (d_avg_alpha)*iptr[i] + (1-d_avg_alpha)*d_avg;
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else if (iptr[i] > d_avg*d_threshold_factor_fall) {
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d_avg = (d_avg_alpha)*iptr[i] + (1-d_avg_alpha)*d_avg;
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peak_val = -(@I_TYPE@)INFINITY;
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//printf("Leaving State 1: Peak: %f Peak Ind: %d i: %d noutput_items: %d\n",
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//peak_val, peak_ind, i, noutput_items);
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//printf("Leave in State 0, produced %d\n",noutput_items);
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return noutput_items;
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else { // only return up to passing the threshold
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//printf("Leave in State 1, only produced %d of %d\n",peak_ind,noutput_items);