computes the loudness of audio according to the EBU momentary definition.


computes the loudness according to the definition def.

Details and Options

  • AudioLoudness tries to locally compute a measure of the perceptual amplitude.
  • AudioLoudness returns a TimeSeries of the computed loudness measure for each partition.
  • Available settings for loudness definition def include:
  • "EBUMomentary"K-filtering, 400ms partitions & 100ms offset (in LUFS)
    "EBUShortTerm"K-filtering, 3000ms partitions & 100ms offset (in LUFS)
    "VUMeter"no filtering, 300ms partitions & 100ms offset (in VU)
    "Peak"max value, 400ms partitions & 100ms offset (in dBFS)
    "TruePeak"max value, 400ms partitions & 100ms offset, resampling to 192 kHz (in dBFS)
  • Loudness Units Full Scale (LUFS) is an absolute measure. The recommended target loudness level is usually LUFS. One unit of LUFS is equal to one dB. It is also known as LKFS (Loudness K-weighted Full Scale).
  • K-filtering is the process of applying a filter designed to approximate human loudness perception. It is an integral part of the loudness definition by the EBU.
  • Decibels relative to Full Scale (dBFS) can be used to measure amplitude or RMS levels. 0 dBFS corresponds to an amplitude or RMS value of 1.
  • Volume Unit (VU) is a relative measure. One unit of VU corresponds to 1dB. The zero is placed at the level corresponding to dBFS.
  • For multichannel audio signals, loudness is computed on the average channel values.
  • The following options can be specified:
  • AlignmentCenteralignment of the time stamps with partitions
    PaddingAutomaticpadding scheme
    PaddingSizeAutomaticamount of padding
    MetaInformationNoneinclude additional meta-information
    ResamplingMethodAutomaticthe method to use for resampling paths


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Basic Examples  (1)

Compute the loudness of a recording:

Click for copyable input
Click for copyable input

Compute the loudness using a different definition:

Click for copyable input

Scope  (3)

Options  (4)

Applications  (2)

See Also

AudioNormalize  AudioAmplify  AudioMeasurements  AudioLocalMeasurements  SoundVolume

Introduced in 2017