Package ca.phon.math

Class MathUtils

java.lang.Object
ca.phon.math.MathUtils
public class MathUtils extends Object
Math helper methods.

  • Constructor Summary

    Constructors
    Constructor
    Description
    MathUtils()
     

  • Method Summary

    Modifier and Type
    Method
    Description
    static void
    applyAsymetricalExponentialWindow(double[] samples, int nSamples, double asymFact)
    This inplace function apllyes an Asynchron Expoantion Window function to the given array.
    static void
    applyBlackmanWindow(double[] samples, int N)
    This inplace function applyes a Blackman window function to the gives array.
    static void
    applyCosineWindow(double[] samples, int N)
    This inplace function applyes an Cosine window function to the gives array.
    static void
    applyGaussWindow(double[] samples, int N)
    This inplace function applyes an Gauss window function to the gives array.
    static void
    applyHammingWindow(double[] data, int len)
    This inplace function applyes an Hamming window function to the gives array.
    static void
    applyHannWindow(double[] samples, int N)
    This inplace function applyes an Hann window function to the gives array.
    static void
    applyTriangleWindow(double[] samples, int N)
    This inplace function applyes a Tringle window function to the gives array.
    static void
    applyWelchWindow(double[] samples, int N)
    This inplace function applyes a Welch window function to the gives array.
    static boolean
    isPowerOfTwo(int x)
    Is the given number a power of two.
    static double
    lin2log(double lin)
     
    static int
    nextPowerOfTwo(int v)
    Return next power of two.

    Methods inherited from class java.lang.Object

    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

  • Constructor Details

    • MathUtils

      public MathUtils()

  • Method Details

    • isPowerOfTwo

      public static boolean isPowerOfTwo(int x)
      Is the given number a power of two.

    • nextPowerOfTwo

      public static int nextPowerOfTwo(int v)
      Return next power of two.

    • applyHammingWindow

      public static void applyHammingWindow(double[] data, int len)
      This inplace function applyes an Hamming window function to the gives array. The Hamming window function is per definition delared as: w(n) = 25/46 - 21/46*cos(2*Pi*n/(N-1))
      Parameters:
      data - A pointer to the input samples. Note that the window function is applyed in place which means that no further vector is allocated or given back.
      len - The number of input samples.

    • applyHannWindow

      public static void applyHannWindow(double[] samples, int N)
      This inplace function applyes an Hann window function to the gives array. The Hann window function is per definition delared as: w(n) = 0.5*(1-cos(2*Pi*n/(N-1)))
      Parameters:
      sampels - A pointer to the input samples. Note that the window function is applyed in place which means that no further vector is allocated or given back.
      nSamples - The number of input samples.

    • applyBlackmanWindow

      public static void applyBlackmanWindow(double[] samples, int N)
      This inplace function applyes a Blackman window function to the gives array.
      Parameters:
      Sampels - A pointer to the input samples. Note that the window function is applyed in place which means that no further vector is allocated or given back.
      nSamples - The number of input samples.

    • applyTriangleWindow

      public static void applyTriangleWindow(double[] samples, int N)
      This inplace function applyes a Tringle window function to the gives array.
      Parameters:
      Sampels - A pointer to the input samples. Note that the window function is applyed in place which means that no further vector is allocated or given back.
      nSamples - The number of input samples.

    • applyWelchWindow

      public static void applyWelchWindow(double[] samples, int N)
      This inplace function applyes a Welch window function to the gives array.
      Parameters:
      Sampels - A pointer to the input samples. Note that the window function is applyed in place which means that no further vector is allocated or given back.
      nSamples - The number of input samples.

    • applyGaussWindow

      public static void applyGaussWindow(double[] samples, int N)
      This inplace function applyes an Gauss window function to the gives array.
      Parameters:
      sampels - A pointer to the input samples. Note that the window function is applyed in place which means that no further vector is allocated or given back.
      nSamples - The number of input samples.

    • applyCosineWindow

      public static void applyCosineWindow(double[] samples, int N)
      This inplace function applyes an Cosine window function to the gives array.
      Parameters:
      sampels - A pointer to the input samples. Note that the window function is applyed in place which means that no further vector is allocated or given back.
      nSamples - The number of input samples.

    • applyAsymetricalExponentialWindow

      public static void applyAsymetricalExponentialWindow(double[] samples, int nSamples, double asymFact)
      This inplace function apllyes an Asynchron Expoantion Window function to the given array.
      Parameters:
      samples - A Pointer to the input samples. Note that the window function is applyed in place which means that no further vector is allocated or given back.
      nSamples - The number of input sampels.
      asymFact - This factor influences the unsymetrical side relation from one side to another. The value value should be more/less in the intervall [0.8...1.5]. A typical value is 1.0

    • lin2log

      public static double lin2log(double lin)