com.jsyn.unitgen

Class ParabolicEnvelope

java.lang.Object

com.jsyn.unitgen.UnitGenerator

com.jsyn.unitgen.ParabolicEnvelope

public class ParabolicEnvelope
extends UnitGenerator

ParabolicEnvelope unit. Output goes from zero to amplitude then back to zero in a parabolic arc.

Generate a short parabolic envelope that could be used for granular synthesis. The output starts at zero, peaks at the value of amplitude then returns to zero. This unit has two states, IDLE and RUNNING. If a trigger is received when IDLE, the envelope is started and another trigger is sent out the triggerOutput port. This triggerOutput can be used to latch values for the synthesis of a grain. If a trigger is received when RUNNING, then it is ignored and passed out the triggerPass port. The triggerPass can be connected to the triggerInput of another ParabolicEnvelope. Thus you can implement a simple grain allocation scheme by daisy chaining the triggers of ParabolicEnvelopes.

The envelope is generated by a double integrator method so it uses relatively little CPU time.

Author:

(C) 1997 Phil Burk, SoftSynth.com

See Also:

EnvelopeDAHDSR

Field Summary

Fields

Modifier and Type	Field and Description
UnitInputPort	amplitude
UnitInputPort	frequency Fastest repeat rate of envelope if it were continually retriggered in Hertz.
UnitOutputPort	output
UnitInputPort	triggerInput True value triggers envelope when in resting state.
UnitOutputPort	triggerOutput Trigger output when envelope started.
UnitOutputPort	triggerPass Input trigger passed out if ignored for daisy chaining.

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
ParabolicEnvelope()

Method Summary

Modifier and Type	Method and Description
void	generate(int start, int limit) Perform essential synthesis function.

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

Field Detail

frequency

public UnitInputPort frequency

Fastest repeat rate of envelope if it were continually retriggered in Hertz.

triggerInput

public UnitInputPort triggerInput

True value triggers envelope when in resting state.

amplitude

public UnitInputPort amplitude

triggerOutput

public UnitOutputPort triggerOutput

Trigger output when envelope started.

triggerPass

public UnitOutputPort triggerPass

Input trigger passed out if ignored for daisy chaining.

output

public UnitOutputPort output

Constructor Detail

ParabolicEnvelope

public ParabolicEnvelope()

Method Detail

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