Packages

final case class Pitch(rate: Rate, in: GE, initFreq: GE = 440.0f, minFreq: GE = 60.0f, maxFreq: GE = 4000.0f, execFreq: GE = 100.0f, binsPerOct: GE = 16, median: GE = 1, ampThresh: GE = 0.01f, peakThresh: GE = 0.5f, downSample: GE = 1, clarity: GE = 0) extends MultiOut with Product with Serializable

An autocorrelation based pitch following UGen. It is more accurate than ZeroCrossing , but more also more CPU costly. For most purposes the default settings can be used and only in needs to be supplied.

The UGen has two outputs: The first output is the frequency estimate in Hertz, the second output is a toggle hasFreq , which tells whether a pitch was found (1) or not (0). If the clarify argument is used, hasFreq has more fine grained information.

The pitch follower executes periodically at the rate specified by execFreq in cps. First it detects whether the input peak to peak amplitude is above the ampThresh . If it is not then no pitch estimation is performed, the hasFreq output is set to zero and the freq output is held at its previous value. Otherwise, the autocorrelation is calculated, and the first peak after the peak around the lag of zero that is above peakThresh times the amplitude of the peak at lag zero is reported.

in

The signal to be analyzed.

initFreq

The initial value of the freq output, until the first valid pitch is found. (init-time only)

minFreq

The minimum frequency in Hertz to be considered for reporting. (init-time only)

maxFreq

The maximum frequency in Hertz to be considered for reporting. (init-time only)

execFreq

The frequency at which the pitch is estimated. This will be automatically clipped to be between minFreq and maxFreq . (init-time only)

binsPerOct

A value which guides the search for the peak frequency in the first coarse step. Its setting does *not* affect the final pitch resolution; setting it larger will cause the coarse search to take longer, and setting it smaller will cause the fine search to take longer. (init-time only)

median

This specifies the length of a median filter applied to the frequency output estimation. With the default value of 1 the filter is defeated. Median filtering can help eliminating single spikes and jitter. This will however add latency to the output. (init-time only)

ampThresh

The minimum amplitude threshold above which the pitch follower operates. An input signal below this threshold is not analyzed. (init-time only)

peakThresh

This is a threshold used to find the first peak in the autocorrelation signal which gives the reported frequency. It is a factor of the energy of the signal (autocorrelation coefficient at zero). Set this value higher (e.g. to 1 ) to eliminate false frequencies corresponding to overtones. (init-time only)

downSample

An integer factor by which the input signal is down sampled to reduce CPU overhead. This will also reduce the pitch resolution. The default value of 1 means that the input signal is not down sampled. (init-time only)

clarity

If the clarity argument is greater than zero (it is zero by default) then the hasFreq output is given additional detail. Rather than simply being 1 when a pitch is detected, it is a "clarity" measure in the range between zero and one. (Technically, it's the height of the autocorrelation peak normalised by the height of the zero-lag peak.) It therefore gives a kind of measure of "purity" of the pitched signal. (init-time only)

Linear Supertypes
Serializable, Serializable, MultiOut, SomeOut, GE.Lazy, GE, UGenSource[UGenInLike], Expander[UGenInLike], Lazy, Product, Equals, AnyRef, Any
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Inherited
  1. Pitch
  2. Serializable
  3. Serializable
  4. MultiOut
  5. SomeOut
  6. Lazy
  7. GE
  8. UGenSource
  9. Expander
  10. Lazy
  11. Product
  12. Equals
  13. AnyRef
  14. Any
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Visibility
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Instance Constructors

  1. new Pitch(rate: Rate, in: GE, initFreq: GE = 440.0f, minFreq: GE = 60.0f, maxFreq: GE = 4000.0f, execFreq: GE = 100.0f, binsPerOct: GE = 16, median: GE = 1, ampThresh: GE = 0.01f, peakThresh: GE = 0.5f, downSample: GE = 1, clarity: GE = 0)

    in

    The signal to be analyzed.

    initFreq

    The initial value of the freq output, until the first valid pitch is found. (init-time only)

    minFreq

    The minimum frequency in Hertz to be considered for reporting. (init-time only)

    maxFreq

    The maximum frequency in Hertz to be considered for reporting. (init-time only)

    execFreq

    The frequency at which the pitch is estimated. This will be automatically clipped to be between minFreq and maxFreq . (init-time only)

    binsPerOct

    A value which guides the search for the peak frequency in the first coarse step. Its setting does *not* affect the final pitch resolution; setting it larger will cause the coarse search to take longer, and setting it smaller will cause the fine search to take longer. (init-time only)

    median

    This specifies the length of a median filter applied to the frequency output estimation. With the default value of 1 the filter is defeated. Median filtering can help eliminating single spikes and jitter. This will however add latency to the output. (init-time only)

    ampThresh

    The minimum amplitude threshold above which the pitch follower operates. An input signal below this threshold is not analyzed. (init-time only)

    peakThresh

    This is a threshold used to find the first peak in the autocorrelation signal which gives the reported frequency. It is a factor of the energy of the signal (autocorrelation coefficient at zero). Set this value higher (e.g. to 1 ) to eliminate false frequencies corresponding to overtones. (init-time only)

    downSample

    An integer factor by which the input signal is down sampled to reduce CPU overhead. This will also reduce the pitch resolution. The default value of 1 means that the input signal is not down sampled. (init-time only)

    clarity

    If the clarity argument is greater than zero (it is zero by default) then the hasFreq output is given additional detail. Rather than simply being 1 when a pitch is detected, it is a "clarity" measure in the range between zero and one. (Technically, it's the height of the autocorrelation peak normalised by the height of the zero-lag peak.) It therefore gives a kind of measure of "purity" of the pitched signal. (init-time only)

Value Members

  1. final def !=(arg0: Any): Boolean
    Definition Classes
    AnyRef → Any
  2. final def ##(): Int
    Definition Classes
    AnyRef → Any
  3. final def ==(arg0: Any): Boolean
    Definition Classes
    AnyRef → Any
  4. val ampThresh: GE
  5. final def asInstanceOf[T0]: T0
    Definition Classes
    Any
  6. val binsPerOct: GE
  7. val clarity: GE
  8. def clone(): AnyRef
    Attributes
    protected[java.lang]
    Definition Classes
    AnyRef
    Annotations
    @native() @throws( ... )
  9. val downSample: GE
  10. final def eq(arg0: AnyRef): Boolean
    Definition Classes
    AnyRef
  11. val execFreq: GE
  12. def finalize(): Unit
    Attributes
    protected[java.lang]
    Definition Classes
    AnyRef
    Annotations
    @throws( classOf[java.lang.Throwable] )
  13. def freq: GE
  14. final def getClass(): Class[_]
    Definition Classes
    AnyRef → Any
    Annotations
    @native()
  15. def hasFreq: GE
  16. lazy val hashCode: Int
    Definition Classes
    UGenSource → AnyRef → Any
  17. val in: GE
  18. val initFreq: GE
  19. final def isInstanceOf[T0]: Boolean
    Definition Classes
    Any
  20. def makeUGen(_args: Vec[UGenIn]): UGenInLike
    Attributes
    protected
    Definition Classes
    PitchUGenSource
  21. def makeUGens: UGenInLike

    Abstract method which must be implemented by creating the actual UGens during expansion.

    Abstract method which must be implemented by creating the actual UGens during expansion. This method is at most called once during graph expansion

    returns

    the expanded object (depending on the type parameter U)

    Attributes
    protected
    Definition Classes
    PitchExpander
  22. val maxFreq: GE
  23. val median: GE
  24. val minFreq: GE
  25. final def name: String
    Definition Classes
    UGenSource
  26. final def ne(arg0: AnyRef): Boolean
    Definition Classes
    AnyRef
  27. final def notify(): Unit
    Definition Classes
    AnyRef
    Annotations
    @native()
  28. final def notifyAll(): Unit
    Definition Classes
    AnyRef
    Annotations
    @native()
  29. val peakThresh: GE
  30. val rate: Rate
    Definition Classes
    PitchGE
  31. final def synchronized[T0](arg0: ⇒ T0): T0
    Definition Classes
    AnyRef
  32. final def wait(): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws( ... )
  33. final def wait(arg0: Long, arg1: Int): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws( ... )
  34. final def wait(arg0: Long): Unit
    Definition Classes
    AnyRef
    Annotations
    @native() @throws( ... )

Inherited from Serializable

Inherited from Serializable

Inherited from MultiOut

Inherited from SomeOut

Inherited from GE.Lazy

Inherited from GE

Inherited from UGenSource[UGenInLike]

Inherited from Expander[UGenInLike]

Inherited from Lazy

Inherited from Product

Inherited from Equals

Inherited from AnyRef

Inherited from Any

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