dab_moving_sum_cc.h
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/* -*- 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.
*/
#ifndef INCLUDED_DAB_MOVING_SUM_CC_H
#define INCLUDED_DAB_MOVING_SUM_CC_H
#include <gr_sync_block.h>
class dab_moving_sum_cc;
typedef std::shared_ptr<dab_moving_sum_cc> dab_moving_sum_cc_sptr;
dab_moving_sum_cc_sptr dab_make_moving_sum_cc (int length);
/*!
* \brief Moving sum over a stream of complex floats.
* \ingroup filter
* \param length length of the moving sum (=number of taps)
*
* input: complex
* output: complex
*
* This is the same as an FIR filter with length taps 1, but much faster
* (linear time instead of O(n*m)). On the other hand, since only the diff is
* calculated for each sample, there is some chance of an accumulating error.
*/
class dab_moving_sum_cc : public gr_sync_block
{
private:
// The friend declaration allows dab_make_moving_sum_cc to
// access the private constructor.
friend dab_moving_sum_cc_sptr dab_make_moving_sum_cc (int length);
dab_moving_sum_cc (int length); // private constructor
gr_complexd d_sum;
int d_length;
public:
~dab_moving_sum_cc (); // public destructor
int length() const {return d_length;}
void reset() {d_sum=0;}
// Where all the action really happens
int work (int noutput_items,
gr_vector_const_void_star &input_items,
gr_vector_void_star &output_items);
};
#endif /* INCLUDED_DAB_MOVING_SUM_CC_H */
dab_moving_sum_cc
Moving sum over a stream of complex floats.
Definition dab_moving_sum_cc.h:46
dab_moving_sum_cc::reset
void reset()
Definition dab_moving_sum_cc.h:61
dab_moving_sum_cc::~dab_moving_sum_cc
~dab_moving_sum_cc()
dab_moving_sum_cc::work
int work(int noutput_items, gr_vector_const_void_star &input_items, gr_vector_void_star &output_items)
dab_moving_sum_cc::length
int length() const
Definition dab_moving_sum_cc.h:60
dab_moving_sum_cc::dab_make_moving_sum_cc
friend dab_moving_sum_cc_sptr dab_make_moving_sum_cc(int length)
dab_make_moving_sum_cc
dab_moving_sum_cc_sptr dab_make_moving_sum_cc(int length)