Filters
Class MovingAverageFilter

java.lang.Object
  Filters.AbstractFilter
      Filters.MovingAverageFilter

All Implemented Interfaces:

Filter

public class MovingAverageFilter
extends AbstractFilter

Moving average filter. Stores a local array of values input to the filter and subtracts off the oldest value as it adds the newest one. This makes it as fast as a decaying average filter.

Author:

Doug Gillespie

Field Summary

private int	currIndex
private double[]	filterData
private int	filterLen
private double	filterTotal

Constructor Summary

MovingAverageFilter(int filterLen)

Method Summary

int	getFilterDelay() Gets the delay of the filter - rarely used, but can be important for some processing tasks.
void	prepareFilter() Calculates the poles and zeros for the filter and sets up any memory buffers required during real time operation.
double	runFilter(double data) Runs the filter on a single data value

Methods inherited from class Filters.AbstractFilter

runFilter, runFilter

Methods inherited from class java.lang.Object

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

Field Detail

filterLen

private int filterLen

filterData

private double[] filterData

currIndex

private int currIndex

filterTotal

private double filterTotal

Constructor Detail

MovingAverageFilter

public MovingAverageFilter(int filterLen)

Method Detail

prepareFilter

public void prepareFilter()

Description copied from interface: Filter

Calculates the poles and zeros for the filter and sets up any memory buffers required during real time operation.

Specified by:

prepareFilter in interface Filter

Specified by:

prepareFilter in class AbstractFilter

runFilter

public double runFilter(double data)

Description copied from interface: Filter

Runs the filter on a single data value

Specified by:

runFilter in interface Filter

Specified by:

runFilter in class AbstractFilter

Returns:

New data value

getFilterDelay

public int getFilterDelay()

Description copied from interface: Filter

Gets the delay of the filter - rarely used, but can be important for some processing tasks. For an IIRF filter, this would be half the number of poles, for a moving average or median filter it would be half the filter length.

Returns:

filter delay in samples.