AMR Export Options

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AMR the Adaptive Multi-Rate codec is a patented compression scheme optimized for speech, but also used for mobile telephone ringtones. The wide band variant uses higher bandwidth for higher quality.
Accessed by: File > Export > Export Audio... then choosing AMR (narrow band) Files (FFmpeg) from the Save as type dropdown menu.
Export AMR dialog 3-0-0.png
Also accessed by: File > Export > Export Multiple... then choosing AMR (narrow band) Files (FFmpeg) from the Save as type dropdown menu. In this case the options dialog will appear in the center of the Export Multiple dialog.
Warning icon FFmpeg is not shipped with Audacity but you can download it and then export as AMR (NB) by following these instructions.

AMR-NB Export Setup

  • Bit Rate: Choose a bit rate from 4.75 kbps to 12.2 kbps (defaults to 12.2 kbps). Higher bit rates give higher quality but produce larger files.
Warning icon Due to the format specification, AMR-NB files are always exported at 8,000 Hz sample rate irrespective of the Audacity Project Rate.