PV_JensenAndersen

An FFT based onset detector UGen using a mix of extracted features. It is based on work described in Jensen and Andersen (2003), "Real-time Beat Estimation Using Feature Extraction," in: Proceedings of the Computer Music Modeling and Retrieval Symposium.

First order derivatives of the features are taken. The threshold may need to be set low to pick up on changes.

Examples

// observe detection
play {
  val sig = Decay.ar(Dust.ar(2), 0.1) * WhiteNoise.ar(0.25)
  val th  = MouseX.kr(0.1, 1.0, lag = 0)
  th.poll(HPZ1.kr(th).abs, "thresh")
  val tr  = PV_JensenAndersen.ar(FFT(LocalBuf(2048), sig), thresh = th)
  Seq(sig, SinOsc.ar(440) * Decay.ar(tr * 0.01, 0.1))
}

See also: PV_HainsworthFoote
Onsets

Linear Supertypes

Serializable, Serializable, AnyRef, Any

Value Members

final def !=(arg0: Any): Boolean

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final def ##(): Int

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final def ==(arg0: Any): Boolean

Definition Classes
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def ar(chain: GE, centroid: GE = 0.25f, hfe: GE = 0.25f, hfc: GE = 0.25f, flux: GE = 0.25f, thresh: GE = 1.0f, waitTime: GE = 0.04f): PV_JensenAndersen

chain
the fft signal (buffer) to analyze
centroid
proportion (0 to 1) of spectral centroid feature
hfe
proportion (0 to 1) of high frequency energy feature
hfc
proportion (0 to 1) of high frequency content feature
flux
proportion (0 to 1) of spectral flux feature
thresh
threshold level for detection
waitTime
after an onset is detected, further detections are suppressed for this period in seconds, preventing multiple rapid triggers
final def asInstanceOf[T0]: T0

Definition Classes
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def clone(): AnyRef

Attributes
protected[java.lang]
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@throws( ... )
final def eq(arg0: AnyRef): Boolean

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def equals(arg0: Any): Boolean

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def finalize(): Unit

Attributes
protected[java.lang]
Definition Classes
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@throws( classOf[java.lang.Throwable] )
final def getClass(): Class[_]

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def hashCode(): Int

Definition Classes
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final def isInstanceOf[T0]: Boolean

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final def ne(arg0: AnyRef): Boolean

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final def notify(): Unit

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final def notifyAll(): Unit

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final def synchronized[T0](arg0: ⇒ T0): T0

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def toString(): String

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final def wait(): Unit

Definition Classes
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@throws( ... )
final def wait(arg0: Long, arg1: Int): Unit

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@throws( ... )
final def wait(arg0: Long): Unit

Definition Classes
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@throws( ... )

Related Docs: class PV_JensenAndersen | package ugen

object PV_JensenAndersen extends Serializable

Examples

Value Members

final def !=(arg0: Any): Boolean

final def ##(): Int

final def ==(arg0: Any): Boolean

def ar(chain: GE, centroid: GE = 0.25f, hfe: GE = 0.25f, hfc: GE = 0.25f, flux: GE = 0.25f, thresh: GE = 1.0f, waitTime: GE = 0.04f): PV_JensenAndersen

final def asInstanceOf[T0]: T0

def clone(): AnyRef

final def eq(arg0: AnyRef): Boolean

def equals(arg0: Any): Boolean

def finalize(): Unit

final def getClass(): Class[_]

def hashCode(): Int

final def isInstanceOf[T0]: Boolean

final def ne(arg0: AnyRef): Boolean

final def notify(): Unit

final def notifyAll(): Unit

final def synchronized[T0](arg0: ⇒ T0): T0

def toString(): String

final def wait(): Unit

final def wait(arg0: Long, arg1: Int): Unit

final def wait(arg0: Long): Unit

Inherited from Serializable

Inherited from Serializable

Inherited from AnyRef

Inherited from Any

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