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/* -*- c++ -*- */
/*
* Copyright 2002,2004,2005,2013 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_GR_FXPT_VCO_H
#define INCLUDED_GR_FXPT_VCO_H
#include <blocks/api.h>
#include <blocks/fxpt.h>
#include <gr_complex.h>
namespace gr {
namespace blocks {
/*!
* \brief Voltage Controlled Oscillator (VCO)
* \ingroup misc
*
* Simple calculations of sine and cosine. Set the phase using
* set_phase or adjust it by some delta using adjust_phase. Sine
* and cosine can be retrieved together with sincos(sinx, cosx)
* where sinx and cosx are the returned values at the current
* phase. They can be retrieved individually using either sin() or
* cos().
*/
class BLOCKS_API fxpt_vco
{
private:
int32_t d_phase;
public:
fxpt_vco() : d_phase(0) {}
~fxpt_vco() {}
//! Set the current phase \p angle in radians
void set_phase(float angle) {
d_phase = fxpt::float_to_fixed(angle);
}
//! Update the current phase in radians by \p delta_phase
void adjust_phase(float delta_phase) {
d_phase += fxpt::float_to_fixed(delta_phase);
}
//! Get the current phase in radians
float get_phase() const {
return fxpt::fixed_to_float(d_phase);
}
//! compute sin and cos for current phase angle
void sincos(float *sinx, float *cosx) const
{
*sinx = fxpt::sin(d_phase);
*cosx = fxpt::cos(d_phase);
}
//! compute a block at a time
void cos(float *output, const float *input, int noutput_items,
float k, float ampl = 1.0)
{
for(int i = 0; i < noutput_items; i++) {
output[i] = (float)(fxpt::cos(d_phase) * ampl);
adjust_phase(input[i] * k);
}
}
//! compute cos or sin for current phase angle
float cos() const { return fxpt::cos(d_phase); }
float sin() const { return fxpt::sin(d_phase); }
};
} /* namespace blocks */
} /* namespace gr */
#endif /* INCLUDED_GR_FXPT_VCO_H */
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