QuadratureOscillator.hxx

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/*
  Copyright (c) 2012,2013,2014 Matthew H. Reilly (kb1vc)
  All rights reserved.

  Redistribution and use in source and binary forms, with or without
  modification, are permitted provided that the following conditions are
  met:

  Redistributions of source code must retain the above copyright
  notice, this list of conditions and the following disclaimer.
  Redistributions in binary form must reproduce the above copyright
  notice, this list of conditions and the following disclaimer in
  the documentation and/or other materials provided with the
  distribution.

  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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  OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/

#ifndef QUADOSC_HDR
#define QUADOSC_HDR
#include <complex>
#include <math.h>


namespace SoDa {
  class QuadratureOscillator {
  public:
    QuadratureOscillator() {
      idx = 0;
      ang = 0.0;
      // default IF freq is SampRate/1000;
      setPhaseIncr(2.0 * M_PI / 1000.0);
    }

    std::complex<double> stepOscCD() {
      double s,c;
#if __linux__
      sincos(ang, &s, &c);
#else
      s = sin(ang); c = cos(ang); 
#endif  
      ang = (ang > M_PI) ? (ang - (2.0 * M_PI)) : ang; 
      idx = 0; 

      idx++; 
      ang += phase_incr;
      s = -s; 
      std::complex<double> ret(c, s);
      return ret; 
    }
    
    std::complex<float> stepOscCF() {
      std::complex<double> dv = stepOscCD();
      std::complex<float> fv((float)dv.real(), (float)dv.imag());
      return fv; 
    }

    double stepOscD() {
      std::complex<double> dv = stepOscCD(); 
      return dv.real(); 
    }

    void setPhaseIncr(double _pi) {
      phase_incr = _pi;
    }
    
  private:
    double phase_incr;
    double ang; 
    int idx; 
  };
}

#endif