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/* -*- c++ -*- */
/*
* Copyright 2002,2011,2012,2018 Free Software Foundation, Inc.
*
* This file is part of GNU Radio
*
* SPDX-License-Identifier: GPL-3.0-or-later
*
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <gnuradio/fft/goertzel.h>
#include <gnuradio/math.h>
#include <cmath>
namespace gr {
namespace fft {
goertzel::goertzel(int rate, int len, float freq) { set_params(rate, len, freq); }
void goertzel::set_params(int rate, int len, float freq)
{
d_d1 = 0.0;
d_d2 = 0.0;
float w = 2.0 * GR_M_PI * freq / rate;
d_wr = 2.0 * std::cos(w);
d_wi = std::sin(w);
d_len = len;
d_processed = 0;
}
gr_complex goertzel::batch(const float* in)
{
d_d1 = 0.0;
d_d2 = 0.0;
for (int i = 0; i < d_len; i++)
input(in[i]);
return output();
}
void goertzel::input(const float& input)
{
float y = input + d_wr * d_d1 - d_d2;
d_d2 = d_d1;
d_d1 = y;
d_processed++;
}
gr_complex goertzel::output()
{
gr_complex out((0.5 * d_wr * d_d1 - d_d2) / d_len, (d_wi * d_d1) / d_len);
d_d1 = 0.0;
d_d2 = 0.0;
d_processed = 0;
return out;
}
} /* namespace fft */
} /* namespace gr */
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