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/* -*- c++ -*- */
/*
* Copyright 2002,2013,2018 Free Software Foundation, Inc.
*
* This file is part of GNU Radio
*
* SPDX-License-Identifier: GPL-3.0-or-later
*
*/
#ifndef _GR_NCO_H_
#define _GR_NCO_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 Numerically Controlled Oscillator (NCO)
* \ingroup misc
*/
template <class o_type, class i_type>
class nco
{
public:
nco() : phase(0), phase_inc(0) {}
virtual ~nco() {}
// radians
void set_phase(double angle) { phase = angle; }
void adjust_phase(double delta_phase) { phase += delta_phase; }
// angle_rate is in radians / step
void set_freq(double angle_rate) { phase_inc = angle_rate; }
// angle_rate is a delta in radians / step
void adjust_freq(double delta_angle_rate) { phase_inc += delta_angle_rate; }
// increment current phase angle
void step(int n = 1)
{
phase += phase_inc * n;
if (fabs(phase) > GR_M_PI) {
while (phase > GR_M_PI)
phase -= 2 * GR_M_PI;
while (phase < -GR_M_PI)
phase += 2 * GR_M_PI;
}
}
// units are radians / step
double get_phase() const { return phase; }
double get_freq() const { return phase_inc; }
// compute sin and cos for current phase angle
void sincos(float* sinx, float* cosx) const { gr::sincosf(phase, sinx, cosx); }
// compute cos or sin for current phase angle
float cos() const { return std::cos(phase); }
float sin() const { return std::sin(phase); }
// compute a block at a time
void sin(float* output, int noutput_items, double ampl = 1.0);
void cos(float* output, int noutput_items, double ampl = 1.0);
void sincos(gr_complex* output, int noutput_items, double ampl = 1.0);
void sin(short* output, int noutput_items, double ampl = 1.0);
void cos(short* output, int noutput_items, double ampl = 1.0);
void sin(int* output, int noutput_items, double ampl = 1.0);
void cos(int* output, int noutput_items, double ampl = 1.0);
protected:
double phase;
double phase_inc;
};
template <class o_type, class i_type>
void nco<o_type, i_type>::sin(float* output, int noutput_items, double ampl)
{
for (int i = 0; i < noutput_items; i++) {
output[i] = (float)(sin() * ampl);
step();
}
}
template <class o_type, class i_type>
void nco<o_type, i_type>::cos(float* output, int noutput_items, double ampl)
{
for (int i = 0; i < noutput_items; i++) {
output[i] = (float)(cos() * ampl);
step();
}
}
template <class o_type, class i_type>
void nco<o_type, i_type>::sin(short* output, int noutput_items, double ampl)
{
for (int i = 0; i < noutput_items; i++) {
output[i] = (short)(sin() * ampl);
step();
}
}
template <class o_type, class i_type>
void nco<o_type, i_type>::cos(short* output, int noutput_items, double ampl)
{
for (int i = 0; i < noutput_items; i++) {
output[i] = (short)(cos() * ampl);
step();
}
}
template <class o_type, class i_type>
void nco<o_type, i_type>::sin(int* output, int noutput_items, double ampl)
{
for (int i = 0; i < noutput_items; i++) {
output[i] = (int)(sin() * ampl);
step();
}
}
template <class o_type, class i_type>
void nco<o_type, i_type>::cos(int* output, int noutput_items, double ampl)
{
for (int i = 0; i < noutput_items; i++) {
output[i] = (int)(cos() * ampl);
step();
}
}
template <class o_type, class i_type>
void nco<o_type, i_type>::sincos(gr_complex* output, int noutput_items, double ampl)
{
for (int i = 0; i < noutput_items; i++) {
float cosx, sinx;
nco::sincos(&sinx, &cosx);
output[i] = gr_complex(cosx * ampl, sinx * ampl);
step();
}
}
} /* namespace gr */
#endif /* _NCO_H_ */
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