gr_fxpt_vco.h

这是用python语言写的一个数字广播的信号处理工具包。利用它

/* -*- c++ -*- */
/*
 * Copyright 2002,2004,2005 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 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 <gr_fxpt.h>
#include <gr_complex.h>

/*!
 * \brief Voltage Controlled Oscillator (VCO)
 * \ingroup misc
 */
class gr_fxpt_vco {
  gr_int32	d_phase;

public:
  gr_fxpt_vco () : d_phase (0) {}

  ~gr_fxpt_vco () {}

  // radians
  void set_phase (float angle) {
    d_phase = gr_fxpt::float_to_fixed (angle);
  }

  void adjust_phase (float delta_phase) {
    d_phase += gr_fxpt::float_to_fixed (delta_phase);
  }

  float get_phase () const { return gr_fxpt::fixed_to_float (d_phase); }

  // compute sin and cos for current phase angle
  void sincos (float *sinx, float *cosx) const
  {
    *sinx = gr_fxpt::sin (d_phase);
    *cosx = gr_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)(gr_fxpt::cos (d_phase) * ampl);
      adjust_phase(input[i] * k);
    }
  }

  // compute cos or sin for current phase angle
  float cos () const { return gr_fxpt::cos (d_phase); }
  float sin () const { return gr_fxpt::sin (d_phase); }
};

#endif /* INCLUDED_GR_FXPT_VCO_H */