Filters

Class FIRArbitraryFilter

java.lang.Object

Filters.FilterMethod

Filters.FIRFilterMethod

Filters.FIRArbitraryFilter

public class FIRArbitraryFilter
extends FIRFilterMethod

Arbitrary response filters. this really doens't fit well into the filterMethod framework since it no longer used a filterParams method, but will try to use as best I can so that these more arbitrary filters can be used within the same framework as other types of filter.

Author:

Doug Gillespie

Field Summary

Fields inherited from class Filters.FIRFilterMethod

NRESPONSEPOINTS

Constructor Summary

Constructors

Constructor and Description
FIRArbitraryFilter(double sampleRate, FilterParams filterParams)

Method Summary

Methods

Modifier and Type	Method and Description
int	calculateFilter() Calculate appropriate filter coefficients.
double	getFilterPhase(double omega) Get the filter phase at an angular frequency (o < omega < pi).
void	setResponse(double[] frequency, double[] gain, int logFilterOrder, double windowGamma) Set the filter response.

Methods inherited from class Filters.FIRFilterMethod

createFilter, getFilterGain, getFilterGainConstant, getFilterTaps

Methods inherited from class Filters.FilterMethod

createFilterMethod, getFastFilterCoefficients, getFilterParams, getSampleRate, setFilterParams, setSampleRate

Methods inherited from class java.lang.Object

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

Constructor Detail

FIRArbitraryFilter

public FIRArbitraryFilter(double sampleRate,
                  FilterParams filterParams)

Method Detail

setResponse

public void setResponse(double[] frequency,
               double[] gain,
               int logFilterOrder,
               double windowGamma)

Set the filter response. The first and last frequency points should correspond to the 0 and the niquist frequency

Parameters:

frequency - array of frequency values.

gain - array of gain values.

filterOrder - must be an exact power of 2

calculateFilter

public int calculateFilter()

Description copied from class: FilterMethod

Calculate appropriate filter coefficients. These may vary depending on filter type. So for a IIRF filter, it will be poles and zeros, for a FIR filter it will be teh impulse response function.

Returns:

number of coefficients / poles, etc.

getFilterPhase

public double getFilterPhase(double omega)

Description copied from class: FilterMethod

Get the filter phase at an angular frequency (o < omega < pi).

Overrides:

getFilterPhase in class FIRFilterMethod

Parameters:

omega - angular frequency

Returns:

phase