hmi.math.digitalfilter
Class Winters

java.lang.Object
  hmi.math.digitalfilter.Winters

public final class Winters
extends Object

Winter's low-pass filter. This is a 2-pass Butterworth filter, in which the second 'backward' pass corrects the phase-lag introduced by 1-pass Butterworth filtering. Implementation from: Winter, David A., Biomechanics and Motor Control of Human Movement, Wiley, 2004

Author:

Herwin van Welbergen

Constructor Summary

private

Winters()

Method Summary

private static void	reverse(float[] b)
private static void	reverse(float[] b, int width)
static void	winters(float[] fin, float fc, float fs, float[] fout) Winters-filters the data
static void	winters(float[] fin, float fc, float fs, int width, float[] fout) Winters-filters the data, assumes the input is aligned in blocks of width floats

Methods inherited from class java.lang.Object

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

Constructor Detail

Winters

private Winters()

Method Detail

reverse

private static void reverse(float[] b)

reverse

private static void reverse(float[] b,
                            int width)

winters

public static void winters(float[] fin,
                           float fc,
                           float fs,
                           int width,
                           float[] fout)

Winters-filters the data, assumes the input is aligned in blocks of width floats

Parameters:

fin - input data

fc - cutt-off frequency

fs - sample frequency

width - the block width

fout - output data

winters

public static void winters(float[] fin,
                           float fc,
                           float fs,
                           float[] fout)

Winters-filters the data

Parameters:

fin - input data

fc - cutt-off frequency

fs - sample frequency

fout - output data