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/* -*- c++ -*- */
/*
* Copyright 2005,2013,2018 Free Software Foundation, Inc.
*
* This file is part of GNU Radio
*
* SPDX-License-Identifier: GPL-3.0-or-later
*
*/
#ifndef _GR_VCO_H_
#define _GR_VCO_H_
#include <gnuradio/gr_complex.h>
#include <gnuradio/math.h>
#include <gnuradio/sincos.h>
#include <cmath>
#include <vector>
namespace gr {
/*!
* \brief base class template for Voltage Controlled Oscillator (VCO)
* \ingroup misc
*/
template <class o_type, class i_type>
class vco
{
public:
vco() : d_phase(0) {}
virtual ~vco() {}
// radians
void set_phase(double angle) { d_phase = angle; }
void adjust_phase(double delta_phase)
{
d_phase += delta_phase;
if (fabs(d_phase) > GR_M_PI) {
while (d_phase > GR_M_PI)
d_phase -= 2 * GR_M_PI;
while (d_phase < -GR_M_PI)
d_phase += 2 * GR_M_PI;
}
}
double get_phase() const { return d_phase; }
// compute sin and cos for current phase angle
void sincos(float* sinx, float* cosx) const;
void sincos(gr_complex* output,
const float* input,
int noutput_items,
double k,
double ampl = 1.0);
// compute cos or sin for current phase angle
float cos() const { return std::cos(d_phase); }
float sin() const { return std::sin(d_phase); }
// compute a block at a time
void cos(float* output,
const float* input,
int noutput_items,
double k,
double ampl = 1.0);
protected:
double d_phase;
};
template <class o_type, class i_type>
void vco<o_type, i_type>::sincos(float* sinx, float* cosx) const
{
gr::sincosf(d_phase, sinx, cosx);
}
template <class o_type, class i_type>
void vco<o_type, i_type>::sincos(
gr_complex* output, const float* input, int noutput_items, double k, double ampl)
{
for (int i = 0; i < noutput_items; i++) {
output[i] = gr_complex(cos() * ampl, sin() * ampl);
adjust_phase(input[i] * k);
}
}
template <class o_type, class i_type>
void vco<o_type, i_type>::cos(
float* output, const float* input, int noutput_items, double k, double ampl)
{
for (int i = 0; i < noutput_items; i++) {
output[i] = cos() * ampl;
adjust_phase(input[i] * k);
}
}
} /* namespace gr */
#endif /* _GR_VCO_H_ */
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