com.softsynth.jsyn
Class PitchDetector

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

public class PitchDetector
extends SynthUnit

PitchDetector unit. Analyses an input signal and outputs an estimated period in frames. The frequency is frameRate/period. The confidence port tells you how accurate the estimate is. When the confidence is low, you should ignore the period. You can use a CompareUnit and a LatchUnit to hold values that you are confident of.

Note that a stable monophonic signal is required for accurate pitch tracking.

Tracking can be improved by passing the signal through a lowPass filter. This reduces the higher level harmonics which can confuse the detector.

Version:

JSyn Version 005

Author:

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

See Also:

Synth, SynthChannelData

Field Summary

SynthOutput	confidence
SynthInput	input
SynthOutput	period Period of the waveform in frames.

Constructor Summary

PitchDetector()

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

PitchDetector(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

period

public SynthOutput period

Period of the waveform in frames.

confidence

public SynthOutput confidence

Constructor Detail

PitchDetector

public PitchDetector(SynthContext synthContext,
                     int calculationRate)
              throws SynthException

Throws:

SynthException

PitchDetector

public PitchDetector(SynthContext synthContext)
              throws SynthException

Create a PitchDetector that runs at Synth.RATE_AUDIO.

Throws:

SynthException - If out of memory.

PitchDetector

public PitchDetector()
              throws SynthException

Throws:

SynthException