audio Format
AMR File Format
Adaptive Multi-Rate is an audio compression format optimized for speech coding in 2G/3G mobile telecommunications and voicemail recordings.
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Technical Specifications
| Extensions | .amr |
| MIME Types | audio/amr |
| Category | Audio |
| Engine Tier | tier2-wasm |
| Magic Bytes / Sniffing | 0x23 0x21 0x41 0x4D 0x52 0x0A |
| Opens With | QuickTime, VLC, Audacity |
| Good For | Old mobile phone voice memo recordings and cellular speech archives. |
| Not Recommended For | Music, acoustic instruments, or wide-frequency listening. |