Class/Object

de.sciss.synth.ugen

MFCC

Related Docs: object MFCC | package ugen

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final case class MFCC(chain: GE, numCoeffs: Int = 13) extends MultiOut with ControlRated with IsIndividual with Product with Serializable

A UGen for extracting mel frequency cepstral coefficients. It generates a set of MFCCs; these are obtained from a band-based frequency representation (using the Mel scale by default), and then a discrete cosine transform (DCT). The DCT is an efficient approximation for principal components analysis, so that it allows a compression, or reduction of dimensionality, of the data, in this case reducing 42 band readings to a smaller set of MFCCs. A small number of features (the coefficients) end up describing the spectrum. The MFCCs are commonly used as timbral descriptors.

The output values are somewhat normalised for the range 0.0 to 1.0, but there are no guarantees on exact conformance to this. Commonly, the first coefficient will be the highest value. The number of output channels corresponds to the number of coefficients specified. Technical note: The 0th coefficient is not generated as it consists of multiplying all bands by 1 and summing

Note that despite running at control-rate, the output remains constant for each FFT frame. E.g. with an FFT size of 1024 and 50% overlap, a new measure is generated every 512 audio frames, or (at control block size 64) every 8 control blocks.

chain

the output (buffer) of an FFT UGen which transforms the audio input to track. For the FFT chain, with a standard hop of half FFT size, the FFT size should be 1024 at 44.1 or 48 kHz and 2048 at 88.2 or 96 kHz sampling rate.

numCoeffs

the number of coefficients, defaults to 13, maximum of 42; more efficient to use less of course! Since this number determines the number of output channels of the UGen, it has to be an Int .

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

  1. new MFCC(chain: GE, numCoeffs: Int = 13)

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    chain

    the output (buffer) of an FFT UGen which transforms the audio input to track. For the FFT chain, with a standard hop of half FFT size, the FFT size should be 1024 at 44.1 or 48 kHz and 2048 at 88.2 or 96 kHz sampling rate.

    numCoeffs

    the number of coefficients, defaults to 13, maximum of 42; more efficient to use less of course! Since this number determines the number of output channels of the UGen, it has to be an Int .

Value Members

  1. final def !=(arg0: Any): Boolean

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    Definition Classes
    AnyRef → Any
  2. final def ##(): Int

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    Definition Classes
    AnyRef → Any
  3. final def ==(arg0: Any): Boolean

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    Definition Classes
    AnyRef → Any
  4. final def asInstanceOf[T0]: T0

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    Definition Classes
    Any
  5. val chain: GE

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    the output (buffer) of an FFT UGen which transforms the audio input to track.

    the output (buffer) of an FFT UGen which transforms the audio input to track. For the FFT chain, with a standard hop of half FFT size, the FFT size should be 1024 at 44.1 or 48 kHz and 2048 at 88.2 or 96 kHz sampling rate.

  6. def clone(): AnyRef

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

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    Definition Classes
    AnyRef
  8. def finalize(): Unit

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

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    Definition Classes
    AnyRef → Any
  10. lazy val hashCode: Int

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    Definition Classes
    UGenSource → AnyRef → Any
  11. final def isInstanceOf[T0]: Boolean

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    Definition Classes
    Any
  12. def makeUGens: UGenInLike

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    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
    MFCCExpander
  13. final def name: String

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    Definition Classes
    UGenSource
  14. final def ne(arg0: AnyRef): Boolean

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    Definition Classes
    AnyRef
  15. final def notify(): Unit

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    Definition Classes
    AnyRef
  16. final def notifyAll(): Unit

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    Definition Classes
    AnyRef
  17. val numCoeffs: Int

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    the number of coefficients, defaults to 13, maximum of 42; more efficient to use less of course! Since this number determines the number of output channels of the UGen, it has to be an Int .

  18. final def rate: Rate

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    Definition Classes
    ControlRated
  19. final def synchronized[T0](arg0: ⇒ T0): T0

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    Definition Classes
    AnyRef
  20. final def wait(): Unit

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

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    Definition Classes
    AnyRef
    Annotations
    @throws( ... )
  22. final def wait(arg0: Long): Unit

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    Definition Classes
    AnyRef
    Annotations
    @throws( ... )

Inherited from Serializable

Inherited from Serializable

Inherited from IsIndividual

Inherited from ControlRated

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

Ungrouped