Create AMR Files

AMR audio codec's name comes from Adaptive Multi-Rate and it is used by 3G mobile phones to create brief voice recordings.

The AMR format features a built-in ACELP algorithm capable of compressing human speech audio at great quality and AMR audio files are usually generated by recording audio from various sources.

Because AMR is a very popular format in GSM and UMTS devices, developers have created apps that allow users to quickly convert their favorite audio tracks to AMR and use them as ringtones on their handsets.