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/* -*- c++ -*- */
/*
* Copyright 2005 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 2, 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 _GR_VCO_H_
#define _GR_VCO_H_
#include <vector>
#include <gr_sincos.h>
#include <cmath>
#include <gr_complex.h>
/*!
* \brief base class template for Voltage Controlled Oscillator (VCO)
*/
//FIXME Eventually generalize this to fixed point
template<class o_type, class i_type>
class gr_vco {
public:
gr_vco () : d_phase (0) {}
virtual ~gr_vco () {}
// radians
void set_phase (double angle) {
d_phase = angle;
}
void adjust_phase (double delta_phase) {
d_phase += delta_phase;
if (fabs (d_phase) > M_PI){
while (d_phase > M_PI)
d_phase -= 2*M_PI;
while (d_phase < -M_PI)
d_phase += 2*M_PI;
}
}
double get_phase () const { return d_phase; }
// compute sin and cos for current phase angle
void sincos (float *sinx, float *cosx) const;
// 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
gr_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
gr_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);
}
}
#endif /* _GR_VCO_H_ */
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