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AudioResample[audio,sr]

resamples audio to have the sample rate of sr.

AudioResample[video,sr]

resamples the first audio track in video to have the sample rate of sr.

Details and Options
Details and Options Details and Options
Examples  
Basic Examples  
Scope  
Options  
Antialiasing  
Padding  
Resampling  
Applications  
See Also
Related Guides
History
Cite this Page

AudioResample

AudioResample[audio,sr]

resamples audio to have the sample rate of sr.

AudioResample[video,sr]

resamples the first audio track in video to have the sample rate of sr.

Details and Options

  • AudioResample can be used to convert between any sampling rates, including the common ones, e.g. telephone, CD and DVD.
  • The sample rate sr can be given as a positive integer, assumed to be in hertz, a quantity, or a Scaled parameter.
  • The following common sampling rates are also supported:
  • "Telephone"8000used for telephone signal
    "CD"44100used in audio CD, MP3, etc.
    "DVD"48000DVD, professional video equipment, etc.
    "DVDAudio"96000DVD-Audio, Blu-ray, etc.
  • AudioResample works with Audio objects of any number of channels.
  • The following options can be given:
  • Antialiasing Truewhether to antialias when downsampling
    Padding 0padding method
    Resampling Automaticresampling method
  • For possible settings for Padding, see the reference page for AudioPad.

Examples

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Basic Examples  (1)

Resample an audio object:

Wolfram Language code: a = ExampleData[{"Sound", "RollingCoin"}, "Audio"]; AudioSampleRate[a]
Wolfram Language code: ar = AudioResample[a, 8000]; AudioSampleRate[ar]

Scope  (4)

Specify the sample rate using a frequency Quantity:

Wolfram Language code: a = AudioGenerator["Sin"];
Wolfram Language code: AudioResample[a, Quantity[11025, "Hertz"]]//AudioSampleRate

Specify the sample rate using a Scaled value:

Wolfram Language code: a = AudioGenerator["Sin"];
Wolfram Language code: AudioResample[a, Scaled[.25]]//AudioSampleRate

Specify the sample rate using a preset value:

Wolfram Language code: a = AudioGenerator["Sin"];
Wolfram Language code: AudioResample[a, "Telephone"]//AudioSampleRate

Process the audio track of a video:

Wolfram Language code: AudioResample[\!\(\*VideoBox["![Video Player: ExampleData/fish.mp4](video://content-2sfji)"]\), 16000]//AudioSampleRate

Options  (3)

Antialiasing  (1)

When resampling to a lower sample rate, an antialiasing filter is applied by default:

Wolfram Language code: a = AudioGenerator[{"Sin", 3500}, SampleRate -> 8000] + AudioGenerator[{"Sin", 1500}, SampleRate -> 8000]; Spectrogram[a]

Resampling by a factor of .5 with antialiasing filter:

Wolfram Language code: Spectrogram[AudioResample[a, 4000]]

Use Antialiasing->False:

Wolfram Language code: Spectrogram[AudioResample[a, 4000, Antialiasing -> False]]

Padding  (1)

The default padding value is 0:

Wolfram Language code: a = Audio[{1, -1, 1}, SampleRate -> 1]; AudioResample[a, 2]//AudioData

Specify a different padding:

Wolfram Language code: AudioResample[a, 2, Padding -> "Periodic"]//AudioData

Resampling  (1)

By default, "Lanczos" resampling is used:

Wolfram Language code: a = Audio[{1, 2, 3}, SampleRate -> 1]; AudioResample[a, 2]//AudioData

Use a different resampling scheme:

Wolfram Language code: AudioResample[a, 2, Resampling -> "Linear"]//AudioData

Applications  (2)

Convert an audio object in CD quality (44.1 KHz) to DVD quality (48 KHz):

Wolfram Language code: a = ExampleData[{"Sound", "RollingCoin"}, "Audio"]; dvd = AudioResample[a, "DVD"]
Wolfram Language code: AudioSampleRate /@ {a, dvd}

Resampling to a lower sample rate reduces the memory used by the audio object:

Wolfram Language code: a = ExampleData[{"Sound", "RollingCoin"}, "Audio"]; t = Table[AudioResample[a, sr], {sr, {48000, 44100, 32000, 22050, 11025, 8000}}];
Wolfram Language code: TableForm[{AudioSampleRate[#], Quantity[ByteCount[#], "Bytes"]}& /@ t, TableHeadings -> {None, {"sample rate", "memory"}}]
Wolfram Research (2016), AudioResample, Wolfram Language function, https://reference.wolfram.com/language/ref/AudioResample.html (updated 2024).

Text

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

CMS

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

APA

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

BibTeX

@misc{reference.wolfram_2026_audioresample, author="Wolfram Research", title="{AudioResample}", year="2024", howpublished="\url{https://reference.wolfram.com/language/ref/AudioResample.html}", note=[Accessed: 13-June-2026]}

BibLaTeX

@online{reference.wolfram_2026_audioresample, organization={Wolfram Research}, title={AudioResample}, year={2024}, url={https://reference.wolfram.com/language/ref/AudioResample.html}, note=[Accessed: 13-June-2026]}