AMR vs WAV: Adaptive Multi-Rate Telephony Speech vs Linear PCM Audio
Compare 3GPP Adaptive Multi-Rate (AMR) cellular speech compression with uncompressed 16-bit RIFF WAV audio: bandwidth, compression ratios, and fidelity.
AMR is the highly efficient ACELP speech codec standard developed for 2G/3G mobile networks and MMS voice messaging, while WAV is the universal uncompressed PCM audio format used for studio editing and high-fidelity playback.
| FEATURE | AMR | WAV |
|---|---|---|
| Codec Type | ACELP Speech Codec | Linear PCM (Uncompressed) |
| Typical Bitrate | 4.75 - 12.2 kbps (AMR-NB) | 705.6 - 1411.2 kbps |
| Target Material | Human Speech / Voice Only | Universal (Music, Voice, FX) |
| Browser Playback | Limited / Deprecated | Universal HTML5 Audio |
| Compression Ratio | ~90-95% space reduction | 0% (Raw uncompressed) |
- Extremely lightweight (4.75 kbps to 12.2 kbps)
- Optimized specifically for human voice intelligibility
- Dynamic rate adaptation across unstable cellular connections
- Standard format for legacy voicemail and MMS audio
- Lossless linear PCM audio without voice codec artifacts
- Compatible with every desktop OS, DAW, and web browser
- Supports arbitrary sample rates, bit depths, and multichannel surround
- Zero CPU decoding overhead
AMR was essential for early mobile networks, but modern editing and playback demand universal compatibility. Convert legacy AMR voice recordings into 16-bit linear PCM WAV with convrtr.
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