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
clone, equals, finalize, 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