AMR-NB (Adaptive Multi-Rate Narrowband)
Narrowband voice codec (300-3400 Hz) standard in GSM networks and mobile recordings. Optimized for human speech with bitrates between 4.75 and 12.2 kbps.
Yes, we support AMR-NB!
Technical Specifications
Advantages
- Broad compatibility with legacy players and systems
- Accepted directly without need for conversion
- Accurate automatic transcription via AssemblyAI
Disadvantages
- Lossy compression — not ideal for final production masters
- Limited audio quality can reduce transcription accuracy
Use Cases
How It Works
Upload your file
Upload your AMR-NB file via browser or drag and drop.
Automatic transcription
Our AI transcribes the audio with high accuracy in minutes.
Download the result
Download the transcription as text, SRT, VTT or other formats.
Yes, we support AMR-NB!
Narrowband voice codec (300-3400 Hz) standard in GSM networks and mobile recordings. Optimized for human speech with bitrates between 4.75 and 12.2 kbps.
Frequently Asked Questions
Does VoxScriber support AMR-NB files?
Yes! VoxScriber fully supports AMR-NB files. Simply upload your file and our AI will automatically transcribe it with high accuracy.
What is the audio quality of AMR-NB?
AMR-NB offers Basic audio quality with Lossy compression. This makes it suitable for most transcription use cases — our AssemblyAI engine extracts audio accurately regardless of compression level.
How do I transcribe a AMR-NB file to text?
Go to VoxScriber, upload your AMR-NB file (up to 5 GB / 10 hours), select the language and click transcribe. Your result will be ready in minutes as text, SRT or VTT.