What is Adaptive Multi-Rate (AMR)?
Adaptive Multi-Rate (AMR) is used in speech coding and involves audio data compression. Audio data compression allows for more storage on voice files. “.amt” is a popular filename extension for AMR. Many cell phones use AMR for speech recording storage. AMR is especially associated with the Global System for Mobile Communications (GSM). GSM, a circuit-switched system, originated in Europe in the 1980s and is used in many European countries. Several cellular companies in the United States and other non-European countries also use GSM technology. Speech coding uses a circuit speech codec, or voice codec, that digitally transforms speech. Music can be encoded and decoded in a voice codec, but the quality of the music produced is usually quite poor. The speech or voice codec is specifically made to analyze human speech rather than to offer quality sound in other audio forms such as music. AMR used in cellular technology is said to provide the highest quality of speech clarity for remote mo
