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Information about AMR file format

Name AMR
Full name AMR - Adaptive Multi-Rate
File extension .amr, .3ga
MIME type audio/amr
Developed by 3GPP
Type of format Audio compression format
Description The Adaptive Multi-Rate (AMR or AMR-NB or GSM-AMR) audio codec is an audio compression format optimized for speech coding. AMR was adopted as the standard speech codec by 3GPP in October 1999 and is now widely used in GSM and UMTS.
Technical details AMR speech codec consists of a multi-rate narrowband speech codec that encodes narrowband (200-3400 Hz) signals at variable bit rates ranging from 4.75 to 12.2 kbit/s with toll quality speech starting at 7.4 kbit/s. Sampling frequency 8 kHz/13-bit (160 samples for 20 ms frames), filtered to 200-3400 Hz.
Associated programs Audacity, FFmpeg, MPlayer, QuickTime, VLC media player
Wiki https://en.wikipedia.org/wiki/Adaptive_Multi-Rate_audio_codec