AMR to MP3

Convert AMR to MP3 - online and free - this page also contains information on the AMR and MP3 file extensions.

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File extension	.amr
Category	Audio File
Description	The Adaptive Multi-Rate format was specifically designed for speech coding. Many phone providers use the AMR format to store short audio recordings but shouldn't really be used to store other audio such as music due to it's design. In 1999 AMR was adopted as the chosen speech standard for 3GPP. The AMR file is often converted into other formats to allow for use and ease of distribution.
Actions	*AMR to MP3* - Convert file now View other audio file formats
Technical Details	The AMR codec uses eight source codecs with bit-rates of 12.2, 10.2, 7.95, 7.40, 6.70, 5.90, 5.15 and 4.75 kbit/s and has a sampling frequency of 8kHz which is filtered to 200-3400 Hz. The AMR algorithm utilises link adaptation in order to be utilised with radio channel and capacity requirements.
Associated programs	Apple QuickTime Realplayer VLC media Player Winamp
Developed by	3rd Generation Partnership Project (3GPP)
MIME type	audio/amr
Useful links	Further information on Multi-rate audio files What is an AMR file ? Convert AMR file

File extension	.mp3
Category	Audio File
Description	MP3 is a digital music format which allows CD tracks to be reduced to around a tenth of their normal size without a significant loss of quality. MP3 gets rid of a lot of the information recorded in a song that our ears are not able to hear and then uses complex algorithms to reduce the file size. This then enables you to get hundreds of songs on to a CD and it also has opened up a new market over the internet - the download market as download times have been significantly reduced.
Actions	MP3 Converter View other audio file formats
Technical Details	The MP3 format is a lossy format. That means that an MP3 file does not contain 100% of the original audio information. Instead, MP3 files use perceptual coding. In other words, that means it removes the information that your ear doesn't notice thereby making the file smaller. The reason lossy formats are used over RAW is that RAW audio files are too large to travel over the internet at any great speed. By using lossy formats it enables even dial up users to download mp3 files at a reasonable speed. RAW file formats generally require 176,000 bytes per second compared to a lossy format which requires 17,600. The difference is massive and so are the download times.
Associated programs	RealOne WinAmp Windows Media Player iTunes
Developed by	Moving Picture Experts Group
MIME type	audio/mpeg
Useful links	Further information on MP3 files How MP3 files work MP3 Converter

Using Zamzar it is possible to convert AMR files to a variety of other formats

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