com.jsyn.unitgen

Class FilterFourPoles

java.lang.Object

com.jsyn.unitgen.UnitGenerator

com.jsyn.unitgen.UnitFilter

com.jsyn.unitgen.TunableFilter

com.jsyn.unitgen.FilterFourPoles

All Implemented Interfaces:

UnitSink, UnitSource

public class FilterFourPoles
extends TunableFilter

Resonant filter in the style of the Moog ladder filter. This implementation is loosely based on: http://www.musicdsp.org/archive.php?classid=3#26 More interesting reading: http://dafx04.na.infn.it/WebProc/Proc/P_061.pdf http://www.acoustics.ed.ac.uk/wp-content/uploads/AMT_MSc_FinalProjects /2012__Daly__AMT_MSc_FinalProject_MoogVCF.pdf http://www.music.mcgill.ca/~ich/research/misc/papers/cr1071.pdf

Author:

Phil Burk (C) 2014 Mobileer Inc

See Also:

FilterLowPass

Field Summary

Fields

Modifier and Type	Field and Description
UnitInputPort	gain
UnitInputPort	Q

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
FilterFourPoles()

Method Summary

Modifier and Type	Method and Description
void	generate(int start, int limit) Perform essential synthesis function.
boolean	isOversampled()
void	recalculate() The recalculate() method checks and ensures that the frequency and Q values are at a minimum.
void	reset()
void	setOversampled(boolean oversampled)

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

Q

public UnitInputPort Q

gain

public UnitInputPort gain

Constructor Detail

FilterFourPoles

public FilterFourPoles()

Method Detail

recalculate

public void recalculate()

The recalculate() method checks and ensures that the frequency and Q values are at a minimum. It also only updates the coefficients if either frequency or Q have changed.

generate

public void generate(int start,
                     int limit)

Description copied from class: UnitGenerator

Perform essential synthesis function.

Specified by:

generate in class UnitGenerator

Parameters:

start - offset into port buffers

limit - limit offset into port buffers for loop

isOversampled

public boolean isOversampled()

setOversampled

public void setOversampled(boolean oversampled)

reset

public void reset()