EST_Complex.cc

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/*                Centre for Speech Technology Research                  */
/*                     University of Edinburgh, UK                       */
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/*                     Author :  Paul Taylor                             */
/*                     Date   :  December 1997                           */
/*-----------------------------------------------------------------------*/
/*                                                                       */
/*=======================================================================*/

#include "EST_Complex.h"


// Addition

EST_Complex operator + (const EST_Complex& z1, const EST_Complex &z2)
{
    return EST_Complex(z1.r + z2.r, z1.i + z2.i);
}

EST_Complex operator + (const EST_Complex& z, float x)
{
    return EST_Complex(z.r + x, z.i);
}

EST_Complex operator + (float x, const EST_Complex &z)
{
    return EST_Complex(z.r + x, z.i);
}

// Subtraction

EST_Complex operator - (const EST_Complex& z1, const EST_Complex &z2)
{
    return EST_Complex(z1.r - z2.r, z1.i - z2.i);
}

EST_Complex operator - (const EST_Complex& z, float x)
{
    return EST_Complex(z.r -x, z.i);
}

EST_Complex operator - (float x, const EST_Complex &z)
{
    return EST_Complex(x - z.r, - z.i);
}

// Multiplication

EST_Complex operator * (const EST_Complex& z1, const EST_Complex &z2)
{
    return EST_Complex((z1.r * z2.r) - (z1.i * z2.i), (z1.r * z2.i) + (z1.i * z2.r));
}

EST_Complex operator * (const EST_Complex& z, float x)
{
    return EST_Complex(z.r * x, z.i *x);
}

EST_Complex operator * (float x, const EST_Complex &z)
{
    return EST_Complex(z.r * x, z.i *x);
}

// Division

EST_Complex operator / (const EST_Complex& z1, const EST_Complex &z2)
{
  double m = z1.mag();
  
  EST_Complex inv(z1.r / m, z1.i /m);

  return inv * z2;
}

EST_Complex operator / (const EST_Complex& z, float x)
{
    return EST_Complex(z.r / x, z.i / x);
}

EST_Complex operator / (float x, const EST_Complex &z)
{
    EST_Complex a(x, 0.0);
    return (z / a);
}