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AudioMeasurements
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AudioMeasurements

Updated in 14.1

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AudioMeasurements[audio,"prop"]

computes the property "prop" for the entire audio.

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AudioMeasurements[audio,{"prop1","prop2",…}]

computes several properties "propi".

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AudioMeasurements[audio,"prop",format]

returns the values in the specified output format.

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AudioMeasurements[{audio1,audio2,…},…]

returns measurements for all audioi.

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AudioMeasurements[video,…]

returns measurements for the first audio track in video.

Details and Options

  • AudioMeasurements[audio,"Properties"] gives names of all available properties as a list of strings.
  • Global audio properties:
  • "Channels"number of channels
    "Duration"duration
    "Length"number of samples
    "SampleRate"sample rate in Hz
    "Type"data type
  • All of the following properties are computed on the average channel values.
  • Basic histogram properties:
  • "Max"maximum value
    "MaxAbs"maximum absolute value
    "Min"minimum value
    "MinAbs"minimum absolute value
    "MinMax"minimum and maximum values
    "MinMaxAbs"minimum and maximum absolute values
    "Mean"mean value
    "Median"median value
    "ApproximateMedian"approximate median
    "StandardDeviation"standard deviation of values
    "Total"sum of values
  • Intensity properties:
  • "Loudness"computed with Stevens's power law ()
    "LoudnessEBU"perceptual loudness (in LUFS) using the EBU standard
    "LoudnessRangeEBU"perceptual loudness range using the EBU standard
    "Power"mean of the squared values
    "RMSAmplitude"root mean square of the values
  • Time domain properties:
  • "CrestFactor"maximum divided by the root mean square
    "PeakToAveragePowerRatio"maximum power divided by the average power
    "TemporalCentroid"temporal centroid of values
    "ZeroCrossings"number of zero crossings
    "ZeroCrossingRate"rate of zero crossings
  • Frequency domain properties:
  • "SpectralCentroid"centroid of the power spectrum
    "SpectralCrest"maximum divided by the mean of the power spectrum
    "SpectralFlatness"geometric mean divided by the mean of the power spectrum
    "SpectralKurtosis"kurtosis of the magnitude spectrum
    "SpectralRollOff"frequency below which most of the energy is concentrated
    "SpectralSkewness"skewness of the magnitude spectrum
    "SpectralSlope"estimated slope of the magnitude spectrum
    "SpectralSpread"measure of the bandwidth of the power spectrum
  • By default, a list of property values is returned. Other format specifications include:
  • Automaticdetermine the output automatically
    "Association"format the result as an Association
    "Dataset"format the result as a Dataset
    "List"format the result as a List
    "RuleList"format the result as a list of Rule expressions

Examples

open allclose all

Basic Examples  (2)Summary of the most common use cases

Compute the minimum and maximum sample values in an audio object:

In[1]:=1
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https://wolfram.com/xid/0dqwatmisy7-sxfifm
In[2]:=2
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https://wolfram.com/xid/0dqwatmisy7-ojfhxk
Out[2]=2
In[3]:=3
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https://wolfram.com/xid/0dqwatmisy7-eenims
Out[3]=3

Compute multiple properties:

In[1]:=1
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https://wolfram.com/xid/0dqwatmisy7-5dcce2
In[2]:=2
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https://wolfram.com/xid/0dqwatmisy7-jhrqr2
Out[2]=2

Scope  (4)Survey of the scope of standard use cases

Compute several properties on multiple audio objects:

In[1]:=1
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https://wolfram.com/xid/0dqwatmisy7-e5nijg
In[2]:=2
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https://wolfram.com/xid/0dqwatmisy7-j9hvat
Out[2]=2

Format the output as an Association:

In[1]:=1
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https://wolfram.com/xid/0dqwatmisy7-zjgrnj
In[2]:=2
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https://wolfram.com/xid/0dqwatmisy7-cgat7i
Out[2]=2

Return a list of values:

In[3]:=3
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https://wolfram.com/xid/0dqwatmisy7-1tkojs
Out[3]=3

Return a list of rules:

In[4]:=4
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https://wolfram.com/xid/0dqwatmisy7-cgd881
Out[4]=4

Return a Dataset:

In[5]:=5
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https://wolfram.com/xid/0dqwatmisy7-hy2040
Out[5]=5

In multichannel audio objects, the channels are averaged before the computation of the properties:

In[1]:=1
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https://wolfram.com/xid/0dqwatmisy7-3ie9w4
In[2]:=2
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https://wolfram.com/xid/0dqwatmisy7-oddfwm
Out[2]=2

Process the audio track of a video:

In[1]:=1
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https://wolfram.com/xid/0dqwatmisy7-l7x9gq
Out[1]=1

Applications  (2)Sample problems that can be solved with this function

Detect whether an audio object has constant sample values:

In[1]:=1
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https://wolfram.com/xid/0dqwatmisy7-ga8k23
In[2]:=2
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https://wolfram.com/xid/0dqwatmisy7-2eozm8
Out[2]=2

Use spectral features to find clusters in a list of audio objects:

In[1]:=1
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https://wolfram.com/xid/0dqwatmisy7-i35fld

Compute the "SpectralCentroid" and "SpectralSpread" properties over the list of audio objects:

In[2]:=2
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https://wolfram.com/xid/0dqwatmisy7-ia2djr

Find clusters of similar sounds:

In[3]:=3
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https://wolfram.com/xid/0dqwatmisy7-2s3y8i
Out[3]=3

Plot the result using the audio objects as plot markers:

In[4]:=4
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https://wolfram.com/xid/0dqwatmisy7-6zbukp
Out[4]=4

Properties & Relations  (4)Properties of the function, and connections to other functions

Functions like Min applied to multichannel audio work on flattened data:

In[1]:=1
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https://wolfram.com/xid/0dqwatmisy7-tetfp2
In[2]:=2
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https://wolfram.com/xid/0dqwatmisy7-kkbjhd
Out[2]=2

AudioMeasurements works on the mono version of the input audio signal:

In[3]:=3
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https://wolfram.com/xid/0dqwatmisy7-safmo6
Out[3]=3
In[4]:=4
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https://wolfram.com/xid/0dqwatmisy7-pgb698
Out[4]=4

The "LoudnessEBU" is computed according to the integrated loudness EBU specification:

In[1]:=1
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https://wolfram.com/xid/0dqwatmisy7-omdkos

The loudness is computed using the EBU momentary specification:

In[2]:=2
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https://wolfram.com/xid/0dqwatmisy7-xbvy5h
In[3]:=3
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https://wolfram.com/xid/0dqwatmisy7-yvrc6e
Out[3]=3

A temporary mean is computed by discarding all values below LUFS:

In[4]:=4
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https://wolfram.com/xid/0dqwatmisy7-vp8s70
Out[4]=4

Another mean is computed by excluding all values below the temporary mean minus 10 LUFS:

In[5]:=5
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https://wolfram.com/xid/0dqwatmisy7-jnpwc8
Out[5]=5
In[6]:=6
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https://wolfram.com/xid/0dqwatmisy7-b3vxev
Out[6]=6

The "LoudnessRangeEBU" is computed according to the integrated loudness EBU specification:

In[1]:=1
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https://wolfram.com/xid/0dqwatmisy7-0qh5cs

The loudness is computed using the EBU momentary specification:

In[2]:=2
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https://wolfram.com/xid/0dqwatmisy7-s1vjlm
In[3]:=3
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https://wolfram.com/xid/0dqwatmisy7-3z2kuy
Out[3]=3

First, a temporary mean is computed by discarding all values below LUFS:

In[4]:=4
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https://wolfram.com/xid/0dqwatmisy7-y8512o
Out[4]=4

Then all values below the temporary mean minus 20 LUFS are excluded:

In[5]:=5
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https://wolfram.com/xid/0dqwatmisy7-7cvxlz

The loudness is computed as the difference between the .1 and .95 quantiles of the list:

In[6]:=6
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https://wolfram.com/xid/0dqwatmisy7-bid06x
Out[6]=6
In[7]:=7
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https://wolfram.com/xid/0dqwatmisy7-bv6ptp
Out[7]=7
In[8]:=8
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https://wolfram.com/xid/0dqwatmisy7-nhqb93
Out[8]=8

The "LoudnessEBU" property is used in the computation of AudioNormalize:

In[1]:=1
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https://wolfram.com/xid/0dqwatmisy7-sd0yp2
In[2]:=2
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https://wolfram.com/xid/0dqwatmisy7-0l1v2x
Out[2]=2
In[3]:=3
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https://wolfram.com/xid/0dqwatmisy7-8qg3b1
Out[3]=3
Wolfram Research (2016), AudioMeasurements, Wolfram Language function, https://reference.wolfram.com/language/ref/AudioMeasurements.html (updated 2024).
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Wolfram Research (2016), AudioMeasurements, Wolfram Language function, https://reference.wolfram.com/language/ref/AudioMeasurements.html (updated 2024).

Text

Wolfram Research (2016), AudioMeasurements, Wolfram Language function, https://reference.wolfram.com/language/ref/AudioMeasurements.html (updated 2024).

✖
Wolfram Research (2016), AudioMeasurements, Wolfram Language function, https://reference.wolfram.com/language/ref/AudioMeasurements.html (updated 2024).

CMS

Wolfram Language. 2016. "AudioMeasurements." Wolfram Language & System Documentation Center. Wolfram Research. Last Modified 2024. https://reference.wolfram.com/language/ref/AudioMeasurements.html.

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Wolfram Language. 2016. "AudioMeasurements." Wolfram Language & System Documentation Center. Wolfram Research. Last Modified 2024. https://reference.wolfram.com/language/ref/AudioMeasurements.html.

APA

Wolfram Language. (2016). AudioMeasurements. Wolfram Language & System Documentation Center. Retrieved from https://reference.wolfram.com/language/ref/AudioMeasurements.html

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Wolfram Language. (2016). AudioMeasurements. Wolfram Language & System Documentation Center. Retrieved from https://reference.wolfram.com/language/ref/AudioMeasurements.html

BibTeX

@misc{reference.wolfram_2025_audiomeasurements, author="Wolfram Research", title="{AudioMeasurements}", year="2024", howpublished="\url{https://reference.wolfram.com/language/ref/AudioMeasurements.html}", note=[Accessed: 25-April-2025 ]}

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@misc{reference.wolfram_2025_audiomeasurements, author="Wolfram Research", title="{AudioMeasurements}", year="2024", howpublished="\url{https://reference.wolfram.com/language/ref/AudioMeasurements.html}", note=[Accessed: 25-April-2025 ]}

BibLaTeX

@online{reference.wolfram_2025_audiomeasurements, organization={Wolfram Research}, title={AudioMeasurements}, year={2024}, url={https://reference.wolfram.com/language/ref/AudioMeasurements.html}, note=[Accessed: 25-April-2025 ]}

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@online{reference.wolfram_2025_audiomeasurements, organization={Wolfram Research}, title={AudioMeasurements}, year={2024}, url={https://reference.wolfram.com/language/ref/AudioMeasurements.html}, note=[Accessed: 25-April-2025 ]}