com.softsynth.jsyn
Class ParabolicEnvelope

java.lang.Object
  java.util.Observable
      com.softsynth.jsyn.SynthObject
          com.softsynth.jsyn.SynthSound
              com.softsynth.jsyn.SynthUnit
                  com.softsynth.jsyn.ParabolicEnvelope

public class ParabolicEnvelope
extends SynthUnit

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.

Version:

JSyn Version 006

Author:

(C) 1997 Phil Burk, SoftSynth.com, All Rights Reserved

See Also:

Synth, LatchUnit, CompareUnit, SynthEnvelope, SynthEnvelopeQueue

Field Summary

SynthInput	amplitude
SynthInput	frequency Fastest repeat rate of envelope if it were continually retriggered in Hertz.
SynthOutput	output
SynthInput	triggerInput True value triggers envelope when in resting state.
SynthOutput	triggerOutput Trigger output when envelope started.
SynthOutput	triggerPass Input trigger passed out if ignored for daisy chaining.

Constructor Summary

ParabolicEnvelope()

ParabolicEnvelope(SynthContext synthContext)
Create a ParabolicEnvelope that runs at Synth.RATE_AUDIO.

ParabolicEnvelope(SynthContext synthContext, int calculationRate)

Method Summary

Methods inherited from class com.softsynth.jsyn.SynthSound

addPort, addPort, findNamedPort, getName, getNumPorts, getPortAt, getPriority, setPriority, setStage, setStage, start, start, stop, stop

Methods inherited from class com.softsynth.jsyn.SynthObject

delete, deleteAll, enableDeletionByGarbageCollector, enableTracking, getPeer, getSynthContext, isTrackingEnabled, toString, track

Methods inherited from class java.util.Observable

addObserver, countObservers, deleteObserver, deleteObservers, hasChanged, notifyObservers, notifyObservers

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

frequency

public SynthInput frequency

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

triggerInput

public SynthInput triggerInput

True value triggers envelope when in resting state.

triggerOutput

public SynthOutput triggerOutput

Trigger output when envelope started.

triggerPass

public SynthOutput triggerPass

Input trigger passed out if ignored for daisy chaining.

amplitude

public SynthInput amplitude

output

public SynthOutput output

Constructor Detail

ParabolicEnvelope

public ParabolicEnvelope(SynthContext synthContext,
                         int calculationRate)
                  throws SynthException

Throws:

SynthException

ParabolicEnvelope

public ParabolicEnvelope(SynthContext synthContext)
                  throws SynthException

Create a ParabolicEnvelope that runs at Synth.RATE_AUDIO.

Throws:

SynthException - If out of memory.

ParabolicEnvelope

public ParabolicEnvelope()
                  throws SynthException

Throws:

SynthException