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/* -*- c++ -*- */
/*
* Copyright 2006,2011,2012 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_FFT_IMPL_GOERTZEL_H
#define INCLUDED_FFT_IMPL_GOERTZEL_H
#include <gnuradio/fft/api.h>
#include <gnuradio/types.h>
namespace gr {
namespace fft {
/*!
* \brief Implements Goertzel single-bin DFT calculation
* \ingroup misc
*/
class FFT_API goertzel
{
public:
goertzel(int rate, int len, float freq);
void set_params(int rate, int len, float freq);
// Process a input array
gr_complex batch(const float* in);
// Process sample by sample
void input(const float& in);
gr_complex output();
bool ready() const { return d_processed == d_len; }
private:
float d_d1;
float d_d2;
float d_wr;
float d_wi;
int d_len;
int d_processed;
};
} /* namespace fft */
} /* namespace gr */
#endif /* INCLUDED_FFT_IMPL_GOERTZEL_H */
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