com.softsynth.jsyn
Class PeakFollower

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

public class PeakFollower
extends SynthUnit

Tracks the peaks of an input signal. This can be used to monitor the overall amplitude of a signal. The output can be used to drive color organs, vocoders, VUmeters, etc. Output drops exponentially when the input drops below the current output level. The output approaches zero based on the value on the halfLife port.

Version:

JSyn Version 013

Author:

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

See Also:

Synth, SynthUnit

Field Summary

SynthVariable	current Current internal value.
SynthVariable	halfLife Controls rate at which to approach input.
SynthInput	input Signal to approach.
SynthOutput	output

Constructor Summary

PeakFollower()

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

PeakFollower(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

input

public SynthInput input

Signal to approach. SIGNAL_TYPE_RAW_SIGNED

halfLife

public SynthVariable halfLife

Controls rate at which to approach input. If the input is zero, then the output will go from its current value halfway to zero in the time specified using this port. SIGNAL_TYPE_HALF_LIFE

current

public SynthVariable current

Current internal value. This may be tweaked to force the output to a value immediately. It can be used to generate an inexpensive decaying envelope by forcing the current value to a number above zero.

output

public SynthOutput output

Constructor Detail

PeakFollower

public PeakFollower(SynthContext synthContext,
                    int calculationRate)
             throws SynthException

Throws:

SynthException

PeakFollower

public PeakFollower(SynthContext synthContext)
             throws SynthException

Create a PeakFollower that runs at Synth.RATE_AUDIO.

Throws:

SynthException - If out of memory.

PeakFollower

public PeakFollower()
             throws SynthException

Throws:

SynthException