Package Filters

Class ChebyWindow

java.lang.Object
Filters.ChebyWindow
public class ChebyWindow extends Object
Calculates a Chebychev window for use in FOR filter design.
Author:
Doug Gillespie

  • Constructor Summary

    Constructors
    Constructor
    Description
    ChebyWindow()
     

  • Method Summary

    Modifier and Type
    Method
    Description
    static double
    acosh(double x)
    Calculate acosh function.
    static double[]
    getWindow(int nPoint, double gamma)
    Calculate a Chebychev window function.

    Methods inherited from class java.lang.Object

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

  • Constructor Details

    • ChebyWindow

      public ChebyWindow()

  • Method Details

    • getWindow

      public static double[] getWindow(int nPoint, double gamma)
      Calculate a Chebychev window function.

      When used in a filter, the filter will generally have an odd number of taps. This function will return an even number of window values. You should use the 0th to n-2th values, which will be symmetrical about a central value of 1.0.

      Parameters:
      nPoint - number of points
      gamma - Gamma - typically 3, get 20dB * gamma attenuation in filter stop band
      Returns:
      window function

    • acosh

      public static double acosh(double x)
      Calculate acosh function. Returns NaN for input values invalid input: '<' 1
      Parameters:
      x - input
      Returns:
      cosh of values >= 1 or NaN