| Interface | Description | 
|---|---|
| SignalFilter | General interface for a filter that processes a stream of signal sample values. | 
| Class | Description | 
|---|---|
| BesselFilterDesign | Bessel filter design routines. | 
| EchoFilter | A very simple echo filter that adds an echo to a signal. | 
| IirFilter | An IIR (infinite impulse response) filter. | 
| IirFilterCoefficients | The coefficients for an IIR filter. | 
| IirFilterDesignExstrom | Calculates the IIR filter coefficients of a Butterworth filter. | 
| IirFilterDesignFisher | Calculates the coefficients of an IIR filter. | 
| Enum | Description | 
|---|---|
| FilterCharacteristicsType | The filter characteristics type. | 
| FilterPassType | The filter pass type. |