Class DSP_IIRFilter

digital signal processing FILTERS methods

"Finite impulse response" (FIR) filters use only the input signals, while an "infinite impulse response" filter (IIR) uses both the input signal and previous samples of the output signal. FIR filters are always stable, while IIR filters may be unstable.

Inheritance
Object
DSP_IIRFilter
Inherited Members
Namespace: AudioAnalysisTools.DSP
Assembly: AudioAnalysisTools.dll
Syntax
public class DSP_IIRFilter

Constructors

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DSP_IIRFilter(Double[], Double[])

Initializes a new instance of the DSP_IIRFilter class. CONSTRUCTOR 2 Pass your own filter coefficients.

Declaration
public DSP_IIRFilter(double[] a, double[] b)
Parameters
Type Name Description
Double[] a
Double[] b
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DSP_IIRFilter(String)

Initializes a new instance of the DSP_IIRFilter class. CONSTRUCTOR 1.

Declaration
public DSP_IIRFilter(string filterName)
Parameters
Type Name Description
String filterName

Fields

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Gain

Declaration
public double Gain
Field Value
Type Description
Double

Properties

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order

Declaration
public int order { get; set; }
Property Value
Type Description
Int32

Methods

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ApplyIIRFilter(Double[], out Double[])

Declaration
public void ApplyIIRFilter(double[] x, out double[] y)
Parameters
Type Name Description
Double[] x
Double[] y
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ApplyMovingAvHighPassFilter(Double[], Int32, out Double[])

This method implements a crude form of high pass filtering.

Declaration
public static void ApplyMovingAvHighPassFilter(double[] inputSignal, int windowLength, out double[] outputSignal)
Parameters
Type Name Description
Double[] inputSignal
Int32 windowLength
Double[] outputSignal
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Chebyshev_Highpass_400()

Create a Chebyshev_Highpass filter, shoulder=400, order=9; ripple=-0.1dB; sr=22050.

Declaration
public static Tuple<int, double[], double[], double> Chebyshev_Highpass_400()
Returns
Type Description
Tuple<Int32, Double[], Double[], Double>
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Chebyshev_Lowpass_1000()

Create a Chebyshev_lowpass filter, shoulder=1000, order=9; ripple=-0.1dB; sr=22050.

Declaration
public static Tuple<int, double[], double[], double> Chebyshev_Lowpass_1000()
Returns
Type Description
Tuple<Int32, Double[], Double[], Double>
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Chebyshev_Lowpass_3000()

Create a Chebyshev_lowpass filter, shoulder=3000, order=9; ripple=-0.1dB; sr=22050.

Declaration
public static Tuple<int, double[], double[], double> Chebyshev_Lowpass_3000()
Returns
Type Description
Tuple<Int32, Double[], Double[], Double>
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Chebyshev_Lowpass_5000()

Create a Chebyshev_lowpass filter, shoulder=5000, order=9; ripple=-0.1dB; sr=22050 Shoulder located at 0.2267573696 Pi.

Declaration
public static Tuple<int, double[], double[], double> Chebyshev_Lowpass_5000()
Returns
Type Description
Tuple<Int32, Double[], Double[], Double>
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CreateFilter(String)

method to convert string codes to a specific IIR filter. FOR EACH NEW FILTER ADD LINE HERE AND WRITE NEW METHOD TO CREATE FILTER

IMPORTANT: These filters assume a SAMPLE RATE = 22050!!!!!!!!!!!!!.

Declaration
public static Tuple<int, double[], double[], double> CreateFilter(string filterName)
Parameters
Type Name Description
String filterName
Returns
Type Description
Tuple<Int32, Double[], Double[], Double>
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Main(String[])

Declaration
public static void Main(string[] args)
Parameters
Type Name Description
String[] args

Extension Methods