AMR stands for Adaptive Multi-Rate. The .amr file format was developed by Ericsson. Files with the .amr extension are compressed audio files that have been optimized to record speech.
The AMR file format was created for cell phone voice recordings. When a user creates a voice message or voice memo with certain cellular phones, the files are created with the .amr file extension.
Unlike many of the other audio codec formats used for digital devices, the sound quality of AMR files is not ideal. This is because these files are optimized for speech recording and not for quality audio playback.
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