biz.source_code.dsp.signal

Class BrownNoiseGenerator

java.lang.Object

biz.source_code.dsp.signal.BrownNoiseGenerator

public class BrownNoiseGenerator
extends Object

A simple brown noise generator.

Generates brown noise (aka brownian noise or red noise) by integrating white noise, which is generated using Random. A simple high-pass filter is used to reduce DC drift and clipping.

Reference: Wikipedia

Constructor Summary

Constructors

Constructor and Description
BrownNoiseGenerator() Creates a brown noise generator with an output range of -1 to +1.
BrownNoiseGenerator(double minValue, double maxValue) Creates a brown noise generator with a specified output value range.
BrownNoiseGenerator(double minValue, double maxValue, double slope, double hpFilter) Creates a brown noise generator.

Method Summary

Modifier and Type	Method and Description
double	getNext() Returns the next output value of the noise generator.

Methods inherited from class java.lang.Object

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

Constructor Detail

BrownNoiseGenerator

public BrownNoiseGenerator()

Creates a brown noise generator with an output range of -1 to +1.

BrownNoiseGenerator

public BrownNoiseGenerator(double minValue,
                           double maxValue)

Creates a brown noise generator with a specified output value range.

Parameters:

minValue - Minimum output value.

maxValue - Maximum output value.

BrownNoiseGenerator

public BrownNoiseGenerator(double minValue,
                           double maxValue,
                           double slope,
                           double hpFilter)

Creates a brown noise generator.

Parameters:

minValue - Minimum output value.

maxValue - Maximum output value.

slope - Maximum slope of the output signal. This parameter defines the maximum difference between two consecutive output values. It controls the amplitude of the output signal spectrum. A reasonable value is (maxValue - minValue) / 20.

hpFilter - High pass filter factor. A simple first-order high pass filter is used to reduce DC drift of the output signal and avoid frequent clipping. A reasonable value is 0.02. If this parameter is zero, the high pass filter is disabled.

Method Detail

getNext

public double getNext()

Returns the next output value of the noise generator.