If you have Samsung D900 or a new mobile phone chances are you record audio to an .amr file which stands for Adaptive Multi Rate.
AMR is an advanced voice codec for GSM, a voice codec translates sound into digital data and vice-versa.
AMR gains efficiency by being “adaptive”. Unlike older standards, AMR automatically operates in different modes depending on signal conditions, and continuously adjusts to match the sounds being transmitted.
AMR is used automatically whenever both the phone and the base station (tower) support it. Nearly all new GSM phones support AMR.
Now to convert .amr to .mp3 you need iTunes and Quicktime, if your on a Mac chances are you already have both app. First you need to open the .amr file with Quicktime and save it as .mp4 if your mobile phone supports .mp4 then you dont need to convert it to MP3, to convert .mp4 to .mp3 open the MP4 file in iTunes, on your iTunes Library right click on the file and select “create an MP3 version”, now you have an mp3 file just locate it by right clicking on the file name and choose “show in finder”.
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