This article describes what an AMR file is, how to open it on your computer, and how to convert it to another format.
How to open AMR files
A file with the AMR file extension is an Adaptive Multi-Rate ACELP Codec file. ACELP is an audio compression algorithm for human speech that stands for Algebraic Code Excited Linear Prediction.
Adaptive Multi-Rate is therefore a compression technology used for encoding audio files that are primarily speech-based, such as for mobile phone voice recordings and VoIP applications.
To reduce bandwidth usage when no audio is playing in the file, the AMR format uses technologies such as Discontinuous Transmission (DTX), Comfort Noise Generation (CNG), and Voice Activity Detection (VAD).
