Adaptive Multi-Rate Audio

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* [https://www.online-convert.com/file-format/amr AMR info and sample]
 
* [https://www.online-convert.com/file-format/amr AMR info and sample]
 
* [https://gerrit.pixelexperience.org/plugins/gitiles/frameworks_base/+/a539807a7c50948eec99b27e2d4d05da208ae3f1/media/tests/contents/media_api/music/test_amr_ietf.amr Sample AMR]
 
* [https://gerrit.pixelexperience.org/plugins/gitiles/frameworks_base/+/a539807a7c50948eec99b27e2d4d05da208ae3f1/media/tests/contents/media_api/music/test_amr_ietf.amr Sample AMR]
* https://telparia.com/fileFormatSamples/audio/amr/
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* {{DexvertSamples|audio/amr}}
  
 
== References ==
 
== References ==
 
<references/>
 
<references/>

Latest revision as of 04:08, 28 December 2023

File Format
Name Adaptive Multi-Rate Audio
Ontology
Extension(s) .amr .3ga
MIME Type(s) audio/AMR
LoCFDD fdd000254
PRONOM fmt/356
Wikidata ID Q4676210

Adaptive Multi-Rate Audio is a narrowband audio compression format optimized for speech. AMR is a codec adopted by 3GPP and used by many mobile systems.[1][2][3] Apple iOS used the format for voice recordings and voicemail, but changed to the CAF in iOS 12.2[4]

See also AMR-WB

Contents

[edit] File Identification

The first 5 bytes of an AMR is the hex values 2321414D52 or ascii #!AMR

[edit] Specifications

[edit] Software

[edit] Sample Files

[edit] References

  1. https://en.wikipedia.org/wiki/Adaptive_Multi-Rate_audio_codec
  2. http://www.voiceage.com/AMR-NB.AMR.html
  3. https://tools.ietf.org/html/rfc4867
  4. https://www.macrumors.com/2019/03/13/ios-12-2-improved-audio-message-quality/
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