Adaptive Multi-Rate audio codec
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What Wikipedia says
The Adaptive Multi-Rate (AMR, AMR-NB or GSM-AMR) audio codec is an audio compression format optimized for speech coding. AMR is 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.
Excerpt from the Wikipedia article “Adaptive Multi-Rate audio codec”, under the CC BY-SA 4.0 license. Read the article on Wikipedia
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