Filters

Class IirfFilter

java.lang.Object

Filters.IirfFilter

All Implemented Interfaces:

Filter

public class IirfFilter
extends java.lang.Object
implements Filter

Author:

Doug Gillespie

Digital filtering with Infinite Impulse Response filter functions A new instance of this class must be created for each channel

Constructor Summary

Constructors

Constructor and Description
IirfFilter(int channel, double sampleRate, FilterParams filterParams)

Method Summary

Methods

Modifier and Type	Method and Description
int	getFilterDelay() Gets the delay of the filter - rarely used, but can be important for some processing tasks.
FilterMethod	getFilterMethod()
void	prepareFilter() Calculates the poles and zeros for the filter and sets up any memory buffers required during real time operation.
double	runFilter(double aData) Runs the filter on a single data value
void	runFilter(double[] inputData) Runs the filter on an array of data
void	runFilter(double[] inputData, double[] outputData) Runs the filter on an array of data
void	sayFilter()
void	setFilterMethod(IIRFilterMethod filterMethod)
void	setParams(FilterParams filterParams) Sets parameters then calls stuff to work out all the filter coefficients, etc.
void	setParams(int channel, FilterParams filterParams, float sampleRate)

Methods inherited from class java.lang.Object

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

Constructor Detail

IirfFilter

public IirfFilter(int channel,
          double sampleRate,
          FilterParams filterParams)

Parameters:

channel - Channel number

filterParams - Parameters for filter operation

Method Detail

setParams

public void setParams(int channel,
             FilterParams filterParams,
             float sampleRate)

setParams

public void setParams(FilterParams filterParams)

Sets parameters then calls stuff to work out all the filter coefficients, etc.

Parameters:

filterParams -

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

sayFilter

public void sayFilter()

runFilter

public void runFilter(double[] inputData)

Description copied from interface: Filter

Runs the filter on an array of data

New values overwrite the old values in the array.

Specified by:

runFilter in interface Filter

runFilter

public void runFilter(double[] inputData,
             double[] outputData)

Description copied from interface: Filter

Runs the filter on an array of data

New values write into the output data array.

Specified by:

runFilter in interface Filter

runFilter

public double runFilter(double aData)

Description copied from interface: Filter

Runs the filter on a single data value

Specified by:

runFilter in interface Filter

Returns:

New data value

getFilterMethod

public FilterMethod getFilterMethod()

setFilterMethod

public void setFilterMethod(IIRFilterMethod filterMethod)

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.

Specified by:

getFilterDelay in interface Filter

Returns:

filter delay in samples.