PV_HainsworthFoote

An FFT based onset detector UGen using a balance of two features. It is based on work described in Hainsworth (2003), "Techniques for the Automated Analysis of Musical Audio," PhD thesis, University of Cambridge. See especially p. 128. The Hainsworth metric is a modification of the Kullback Liebler distance.

Examples

// observe detection
play {
  val sig = Decay.ar(Dust.ar(2), 0.1) * WhiteNoise.ar(0.25)
  val th  = MouseX.kr(0.3, 1.0, lag = 0)
  th.poll(HPZ1.kr(th).abs, "thresh")
  val h   = MouseY.kr(1.0, 0.1, lag = 0)
  val f   = 1 - h
  h.poll(HPZ1.kr(h).abs, "h-f")
  val tr  = PV_HainsworthFoote.ar(FFT(LocalBuf(2048), sig), h, f, thresh = th)
  Seq(sig, SinOsc.ar(440) * Decay.ar(tr * 0.01, 0.1))
}

See also: PV_JensenAndersen
Onsets

Linear Supertypes

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def ar(chain: GE, hainsworth: GE = 0.0f, foote: GE = 0.0f, thresh: GE = 1.0f, waitTime: GE = 0.04f): PV_HainsworthFoote

chain
the fft signal (buffer) to analyze
hainsworth
what strength of detection signal from Hainsworth metric (0 to 1) to use.
foote
what strength of detection signal from normalized Foote metric (0 to 1) to use.
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

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def clone(): AnyRef

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

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def hashCode(): Int

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final def isInstanceOf[T0]: Boolean

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final def notifyAll(): Unit

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final def wait(): Unit

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final def wait(arg0: Long): Unit

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object PV_HainsworthFoote extends Serializable

Examples

Value Members

final def !=(arg0: AnyRef): Boolean

final def !=(arg0: Any): Boolean

final def ##(): Int

final def ==(arg0: AnyRef): Boolean

final def ==(arg0: Any): Boolean

def ar(chain: GE, hainsworth: GE = 0.0f, foote: GE = 0.0f, thresh: GE = 1.0f, waitTime: GE = 0.04f): PV_HainsworthFoote

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

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