Adaptive Multi-Rate Audio

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File Format
Name Adaptive Multi-Rate Audio
Ontology
Extension(s) .amr
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

File Identification

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

Sample Files

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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