AMR Audio (.AMR)
AMR (Adaptive Multi-Rate) is a compressed audio format optimized specifically for speech encoding, widely used in mobile telecommunications. It employs adaptive bitrate encoding that adjusts between 4.75 and 12.2 kbps based on network conditions, prioritizing speech intelligibility over music quality. AMR is the standard speech codec for GSM and UMTS mobile networks worldwide.
Advantages of AMR Audio
What the AMR format does well, and why you might choose it.
- Extremely small file sizes optimized for voice content
- Adaptive bitrate adjusts to network conditions in real-time
- Standard codec in GSM/3G mobile networks worldwide
Limitations of AMR Audio
What the AMRformat doesn't do well, and when to choose another format.
- Very poor quality for music or non-speech audio
- Limited to narrowband (8 kHz) or wideband (16 kHz) sampling
- Not suitable for high-fidelity audio or media production
What AMR files are used for
- Mobile phone voice recording and voice memos
- Cellular voice call encoding in GSM/3G networks
- MMS voice message attachments
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Frequently asked questions about AMR
What is a .AMR file?
AMR (Adaptive Multi-Rate) is a compressed audio format optimized specifically for speech encoding, widely used in mobile telecommunications. It employs adaptive bitrate encoding that adjusts between 4.75 and 12.2 kbps based on network conditions, prioritizing speech intelligibility over music quality. AMR is the standard speech codec for GSM and UMTS mobile networks worldwide.
What is the MIME type of AMR?
The official MIME type for AMR files is audio/amr. This is the value web servers and applications use to identify the format when transferring files.
What category does AMR belong to?
AMR is a Audio Converter format. Files in this category share common conversion paths and use cases.
How do I open a .AMR file?
AMR files are typically opened by software that natively supports the AMR Audioformat. If you don't have a compatible application, the most reliable approach is to convert the file to a more universal format using the converters listed above. Most AMR Audio files convert to widely-supported alternatives in seconds.
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