Ok, the last file extension I am curious about and discussing is the File Extension AMR. This is another one I had no idea about, so I did some research on it is short for Adaptive Multi-Rate and is a patented audio compression optimized for speech encoding. File Extension AMR is also a file format for storing spoken audio using the AMR codec. Many modern mobile telephone handsets will allow you to store short recordings in the AMR format. Programs exist to convert between this and other formats such as MP3, although it should be remembered that AMR is a speech format and is unlikely to give ideal results for other audio like music.
It is a little technical, but the usage of AMR requires optimized link adaptation that selects the best codec mode to meet the local radio channel and capacity requirements. If the radio conditions are bad, source coding is reduced and channel coding is increased. This improves the quality and robustness of the network connection while sacrificing some voice clarity. The new intelligent system allows the network operator to prioritize capacity or quality per station. AMR was adopted as the standard speech codec by 3GPP, which I already mentioned a little.
So, there is a little more file extension information for you. More to come later, enjoy!!
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