gr_threshold_ff.cc

这是用python语言写的一个数字广播的信号处理工具包。利用它

/* -*- c++ -*- */
/*
 * Copyright 2004 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.
 */

// WARNING: this file is machine generated.  Edits will be over written

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <gr_threshold_ff.h>
#include <gr_io_signature.h>

gr_threshold_ff_sptr
gr_make_threshold_ff (float lo, float hi, float initial_state)
{
  return gr_threshold_ff_sptr (new gr_threshold_ff (lo, hi, initial_state));
}

gr_threshold_ff::gr_threshold_ff (float lo, float hi, float initial_state)
  : gr_sync_block ("threshold_ff",
		   gr_make_io_signature (1, 1, sizeof (float)),
		   gr_make_io_signature (1, 1, sizeof (float))),
    d_lo (lo), d_hi (hi), d_last_state (initial_state)
{
}

int
gr_threshold_ff::work (int noutput_items,
		   gr_vector_const_void_star &input_items,
		   gr_vector_void_star &output_items)
{
  const float *in = (const float *) input_items[0];
  float *out = (float *) output_items[0];

  
  for(int i=0; i<noutput_items; i++) {
    if (in[i] > d_hi) {
      out[i] = 1.0;
      d_last_state = 1.0;
    } else if (in[i] < d_lo) {
      out[i] = 0.0;
      d_last_state = 0.0;
    } else
      out[i] = d_last_state;
  }

  return noutput_items;
}