net.sf.jaer.util.filter
Class LowpassFilter

java.lang.Object
  net.sf.jaer.util.filter.Filter
      net.sf.jaer.util.filter.LowpassFilter

Direct Known Subclasses:

AngularLowpassFilter

public class LowpassFilter
extends Filter

A first-order lowpass IIR filter. The first value filtered initializes the filter to the value and stores the first time as reference.

Field Summary

protected float	lastVal The last value
protected float	lpVal The current state of the filter

Fields inherited from class net.sf.jaer.util.filter.Filter

initialized, lastTime, tauMs, TICK_PER_MS

Constructor Summary

LowpassFilter()

Method Summary

float	filter(float val, int time) apply the filter.
float	getValue()
void	setInternalValue(float value) Sets the internral value; used to initialize filter
java.lang.String	toString()

Methods inherited from class net.sf.jaer.util.filter.Filter

get3dBFreqHz, getLastTime, getTauMs, set3dBFreqHz, setTauMs

Methods inherited from class java.lang.Object

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

Field Detail

lpVal

protected float lpVal

The current state of the filter

lastVal

protected float lastVal

The last value

Constructor Detail

LowpassFilter

public LowpassFilter()

Method Detail

filter

public float filter(float val,
                    int time)

Description copied from class: Filter

apply the filter.

Parameters:

val - the new input value

time - the time in us - note units here, microseconds!

Returns:

the new filter output value

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object

setInternalValue

public void setInternalValue(float value)

Sets the internral value; used to initialize filter

Parameters:

value - the value

getValue

public float getValue()

Returns:

output of filter