quantization.h

// Description: Quantization
// Documentation: math_functions.txt

#ifndef PASTELSYS_QUANTIZATION_H
#define PASTELSYS_QUANTIZATION_H

#include "pastel/sys/mytypes.h"

namespace Pastel
{

    //! Converts dreal [0, 1] to integer [0, numbers - 1].
    /*!
   [Quantization]

   x < 0 will be converted to 0.
   x > 1 will be converted to numbers - 1.

   Random uniform distributions on [0, 1] map
   to random uniform distributions on [0, numbers - 1].
   */
    integer quantizeUnsigned(real64 x, integer numbers);

    //! Converts integer [0, numbers - 1] to dreal [0, 1].
    /*!
   x < 0 will be converted to 0.
   x > numbers - 1 will be converted to 1.

   0 maps to 0.
   numbers - 1 maps to 1.
   */
    real64 dequantizeUnsignedMatchEnds(integer x, integer numbers);

    //! Converts integer [0, numbers - 1] to dreal [0, 1].
    /*!
   x < 0 will be converted to 0.
   x > numbers - 1 will be converted to 1.

   Error is minimized.
   */
    real64 dequantizeUnsigned(integer x, integer numbers);

    //! Converts an integer [-2^(N - 1) , 2^(N - 1) - 1] to a dreal [-1, 1].
    /*!
   Integer values below the range will be converted to -1.
   Integer values above the range will be converted to 1.
   */
    template <int N>
    real64 dequantizeSigned(integer i);

    //! Converts an integer [-2^(N - 1) , 2^(N - 1) - 1] to a dreal [-1, 1].
    /*!
   Integer values below the range will be converted to -1.
   Integer values above the range will be converted to 1.
   Random dithering is applied to the result.
   */

    /*
   template <int N>
   real64 ditheredDequantizeSigned(integer i);
   */

    //! Converts a dreal [-1, 1] to integer [-(2^(N - 1) - 1) , 2^(N - 1) - 1].
    /*!
   Real values below the range will be converted to -(2^(N - 1) - 1).
   Real values above the range will be converted to 2^(N - 1) - 1.
   */
    template <int N>
    integer quantizeSigned(real64 r);

}

#include "pastel/sys/math/quantization.hpp"

#endif