AMR File Documentation
Overview
Feature | Value |
---|---|
File Extension | .amr |
Full Name | Adaptive Multi-Rate Codec File |
MIME Type | audio/amr |
Format Type | Audio file format |
Developed By | 3rd Generation Partnership Project (3GPP) |
Compression | Yes, Lossy |
Bit Rates | Variable, 4.75 to 12.2 kbps |
Channels | Mono |
Sample Rate | 8000 Hz |
Usage | Speech Compression |
Codec | AMR-NB (Narrow Band) |
File Structure | Header followed by audio data frames |
Header Identifier | #!AMR |
Popularity | Common in mobile telephony |
Advantages | Good compression, optimized for speech |
Disadvantages | Lossy, not suitable for music |
Adaptive Multi-Rate - Wideband (AMR-WB) | Extension .amr but with higher fidelity |
License | Proprietary |
Alternative Formats | MP3, AAC, OGG |
Typical Applications | VoIP, Audio Recording in Mobile Phones |
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