com.jsyn.unitgen

Class FilterBiquadShelf

java.lang.Object

com.jsyn.unitgen.UnitGenerator

com.jsyn.unitgen.UnitFilter

com.jsyn.unitgen.TunableFilter

com.jsyn.unitgen.FilterBiquad

com.jsyn.unitgen.FilterBiquadShelf

All Implemented Interfaces:

UnitSink, UnitSource

Direct Known Subclasses:

FilterHighShelf, FilterLowShelf

public abstract class FilterBiquadShelf
extends FilterBiquad

This filter is based on the BiQuad filter and is used as a base class for FilterLowShelf and FilterHighShelf. Coefficients are updated whenever the frequency, gain or slope changes.

Author:

Phil Burk (C) 2009 Mobileer Inc

Field Summary

Fields

Modifier and Type	Field and Description
protected double	alpha
protected double	AM1
protected double	AM1cs
protected double	AP1
protected double	AP1cs
protected double	beta_sn
protected double	factorA
UnitInputPort	gain Gain of peak.
protected static double	MINIMUM_SLOPE
UnitInputPort	slope Shelf Slope parameter.

Fields inherited from class com.jsyn.unitgen.FilterBiquad

a0, a1, a2, amplitude, b1, b2, cos_omega, MINIMUM_FREQUENCY, MINIMUM_GAIN, omega, previousFrequency, RATIO_MINIMUM, sin_omega

Fields inherited from class com.jsyn.unitgen.TunableFilter

frequency

Fields inherited from class com.jsyn.unitgen.UnitFilter

input, output

Fields inherited from class com.jsyn.unitgen.UnitGenerator

FALSE, PORT_NAME_AMPLITUDE, PORT_NAME_CUTOFF, PORT_NAME_FREQUENCY, PORT_NAME_FREQUENCY_SCALER, PORT_NAME_INPUT, PORT_NAME_OUTPUT, PORT_NAME_PAN, PORT_NAME_PHASE, PORT_NAME_PRESSURE, PORT_NAME_TIMBRE, PORT_NAME_TIME, synthesisEngine, TRUE, VERY_SMALL_FLOAT

Constructor Summary

Constructors

Constructor and Description
FilterBiquadShelf()

Method Summary

Modifier and Type	Method and Description
void	recalculate() Compute coefficients for shelf filter if frequency, gain or slope have changed.
abstract void	updateCoefficients() Abstract method.

Methods inherited from class com.jsyn.unitgen.FilterBiquad

calculateOmega, generate, performBiquadFilter

Methods inherited from class com.jsyn.unitgen.UnitFilter

getInput, getOutput

Methods inherited from class com.jsyn.unitgen.UnitGenerator

addPort, addPort, autoStop, convertHalfLifeToMultiplier, convertTimeToRate, flattenOutputs, generate, getCircuit, getFramePeriod, getFrameRate, getId, getPortByName, getPorts, getSynthesisEngine, getSynthesizer, getTopUnit, getUnitGenerator, incrementWrapPhase, isEnabled, isStartRequired, printConnections, printConnections, printConnections, pullData, setCircuit, setEnabled, setFrameRate, setPort, setSynthesisEngine, start, start, start, stop, stop, stop

Methods inherited from class java.lang.Object

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

Methods inherited from interface com.jsyn.unitgen.UnitSink

getUnitGenerator, start, start, stop, stop

Methods inherited from interface com.jsyn.unitgen.UnitSource

getUnitGenerator

Field Detail

MINIMUM_SLOPE

protected static final double MINIMUM_SLOPE

See Also:

Constant Field Values

gain

public UnitInputPort gain

Gain of peak. Use 1.0 for flat response.

slope

public UnitInputPort slope

Shelf Slope parameter. When S = 1, the shelf slope is as steep as you can get it and remain monotonically increasing or decreasing gain with frequency.

alpha

protected double alpha

factorA

protected double factorA

AP1

protected double AP1

AM1

protected double AM1

beta_sn

protected double beta_sn

AP1cs

protected double AP1cs

AM1cs

protected double AM1cs

Constructor Detail

FilterBiquadShelf

public FilterBiquadShelf()

Method Detail

updateCoefficients

public abstract void updateCoefficients()

Abstract method. Each filter must implement its update of coefficients.

recalculate

public void recalculate()

Compute coefficients for shelf filter if frequency, gain or slope have changed.

Specified by:

recalculate in class FilterBiquad