MelFilter

A UGen that maps short-time Fourier transformed spectra to the mel scale. To obtain the MFCC, one has to take the log of the output of this UGen and decimate it with a DCT.

Example:

def mfcc(in: GE) = {
  val fsz  = 1024
  val lap  = Sliding(in, fsz, fsz/2) * GenWindow(fsz, GenWindow.Hann)
  val fft  = Real1FFT(lap, fsz, mode = 1)
  val mag  = fft.complex.mag.max(-80)
  val mel  = MelFilter(mag, fsz/2, bands = 42)
  DCT_II(mel.log, 42, 13, zero = 0)
}

in: magnitudes of spectra, as output by Real1FFT(..., mode = 1).complex.abs
size: bands in input spectrum (assumed to be fft-size / 2). lowest band corresponds to DC and highest to (size - 1)/size * sampleRate/2.
minFreq: lower frequency to sample. Will be clipped between zero (inclusive) and Nyquist (exclusive).
maxFreq: upper frequency to sample. Will be clipped between minFreq (inclusive) and Nyquist (exclusive).
bands: number of filter bands output

Linear Supertypes

Serializable, Serializable, SingleOut, SomeOut[StreamOut], GE.Lazy, GE, UGenSource[UGenInLike, StreamOut], Expander[UGenInLike], Lazy, Product, Equals, AnyRef, Any

Instance Constructors

new MelFilter(in: GE, size: GE, minFreq: GE = 55.0, maxFreq: GE = 18000.0, sampleRate: GE = 44100.0, bands: GE = 42)

in
magnitudes of spectra, as output by Real1FFT(..., mode = 1).complex.abs
size
bands in input spectrum (assumed to be fft-size / 2). lowest band corresponds to DC and highest to (size - 1)/size * sampleRate/2.
minFreq
lower frequency to sample. Will be clipped between zero (inclusive) and Nyquist (exclusive).
maxFreq
upper frequency to sample. Will be clipped between minFreq (inclusive) and Nyquist (exclusive).
bands
number of filter bands output

Value Members

final def !=(arg0: Any): Boolean

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

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

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

Definition Classes
Any
val bands: GE

number of filter bands output
def clone(): AnyRef

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

Definition Classes
AnyRef
def finalize(): Unit

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

Definition Classes
AnyRef → Any
val in: GE

magnitudes of spectra, as output by Real1FFT(..., mode = 1).complex.abs
final def isInstanceOf[T0]: Boolean

Definition Classes
Any
def makeUGen(args: IndexedSeq[UGenIn])(implicit b: Builder): UGenInLike

Attributes
protected
Definition Classes
MelFilter → UGenSource
def makeUGens(implicit b: Builder): 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
MelFilter → Expander
val maxFreq: GE

upper frequency to sample.
upper frequency to sample. Will be clipped between minFreq (inclusive) and Nyquist (exclusive).
val minFreq: GE

lower frequency to sample.
lower frequency to sample. Will be clipped between zero (inclusive) and Nyquist (exclusive).
final def name: String

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

Definition Classes
AnyRef
final def notify(): Unit

Definition Classes
AnyRef
final def notifyAll(): Unit

Definition Classes
AnyRef
final def rewrap(args: IndexedSeq[UGenInLike], exp: Int)(implicit b: Builder): UGenInLike

Attributes
protected
Definition Classes
SomeOut → UGenSource
val sampleRate: GE
val size: GE

bands in input spectrum (assumed to be fft-size / 2).
bands in input spectrum (assumed to be fft-size / 2). lowest band corresponds to DC and highest to (size - 1)/size * sampleRate/2.
final def synchronized[T0](arg0: ⇒ T0): T0

Definition Classes
AnyRef
final def unwrap(args: IndexedSeq[UGenInLike])(implicit b: Builder): UGenInLike

Attributes
protected
Definition Classes
UGenSource
final def wait(): Unit

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

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

Definition Classes
AnyRef
Annotations
@throws( ... )

Related Doc: package graph

final case class MelFilter(in: GE, size: GE, minFreq: GE = 55.0, maxFreq: GE = 18000.0, sampleRate: GE = 44100.0, bands: GE = 42) extends SingleOut with Product with Serializable

Instance Constructors

new MelFilter(in: GE, size: GE, minFreq: GE = 55.0, maxFreq: GE = 18000.0, sampleRate: GE = 44100.0, bands: GE = 42)

Value Members

final def !=(arg0: Any): Boolean

final def ##(): Int

final def ==(arg0: Any): Boolean

final def asInstanceOf[T0]: T0

val bands: GE

def clone(): AnyRef

final def eq(arg0: AnyRef): Boolean

def finalize(): Unit

final def getClass(): Class[_]

val in: GE

final def isInstanceOf[T0]: Boolean

def makeUGen(args: IndexedSeq[UGenIn])(implicit b: Builder): UGenInLike

def makeUGens(implicit b: Builder): UGenInLike

val maxFreq: GE

val minFreq: GE

final def name: String

final def ne(arg0: AnyRef): Boolean

final def notify(): Unit

final def notifyAll(): Unit

final def rewrap(args: IndexedSeq[UGenInLike], exp: Int)(implicit b: Builder): UGenInLike

val sampleRate: GE

val size: GE

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

final def unwrap(args: IndexedSeq[UGenInLike])(implicit b: Builder): UGenInLike

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 SingleOut

Inherited from SomeOut[StreamOut]

Inherited from GE.Lazy

Inherited from GE

Inherited from UGenSource[UGenInLike, StreamOut]

Inherited from Expander[UGenInLike]

Inherited from Lazy

Inherited from Product

Inherited from Equals

Inherited from AnyRef

Inherited from Any

Ungrouped