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Adaptive Multi-Rate audio codec - Wikipedia
https://en.wikipedia.org/wiki/Adaptive_Multi-Rate_audio_codec#:~:text=The%20Adaptive%20Multi-Rate%20%28AMR%2C%20AMR-NB%20or%20GSM-AMR%29%20audio,with%20toll%20quality%20speech%20starting%20at%207.4%20kbit%2Fs.
Adaptive Multi-Rate audio codec - Semantic Scholar
https://www.semanticscholar.org/topic/Adaptive-Multi-Rate-audio-codec/120713
The Adaptive Multi-Rate (AMR or AMR-NB or GSM-AMR) audio codec is an audio compression format optimized for speech coding. 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.
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