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AMR (Audio)
| 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. |
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| 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. |
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| Developed by | 3rd Generation Partnership Project (3GPP) |
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MP3 (Audio)
| 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. |
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| 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. |
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| Developed by | Moving Picture Experts Group |
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Convert AMR file
Using Zamzar it is possible to convert AMR files to a variety of other formats
- amr to aac (Advanced Audio Coding File)
- amr to ac3 (AC3 Audio File)
- amr to flac (Free Lossless Audio Codec)
- amr to m4a (Compressed video file)
- amr to mp3 (Compressed audio file)
- amr to mp4 (MPEG-4 Video File)
- amr to ogg (Ogg Vorbis Compressed Audio File)
- amr to wav (Windows audio file)
- amr to wma (Windows Media Audio)