AMR: conversion steps
- Upload your AMR file to start.
- Convert AMR to AAC.
- Download the AMR file.
About AMR files
a narrow-band speech codec from mobile phones
AMR (Adaptive Multi-Rate) is a speech codec designed for mobile networks; its narrow-band form codes voice at 4.75 to 12.2 kbit/s.
Voice notes and call recordings from older phones and dictation apps.
AMR: what conversion changes
Converting AMR re-encodes audio.
AMR: settings to change
Before you convert AMR files, you can adjust: Audio codec, Rate control, Audio bitrate, Quality (VBR), Sample rate, Channels, Normalize loudness, Trim start, Trim duration, and Keep tags.
Limits of the AMR format
AMR keeps only the frequency range of speech, so music in an AMR file sounds poor, and converting it cannot bring the missing range back.
Common questions about AMR
Why do my recorded calls sound so tinny and robotic? AMR was designed to squeeze narrow-band speech over 2G networks, so it discards almost everything but the voice — no conversion can restore the missing range.