![]() Many modern mobile telephone handsets will allow you to store short recordings in the AMR format, it should be remembered that AMR is a speech format and is unlikely to give ideal results for other audio. AMR-NB (Adaptive Multi-Rate Narrowband) is a vocoder employed in low-bitrate applications like mobile phones.ĪMR is also a file format for storing spoken audio using the AMR codec. AMR can be further categorized as: AMR-NB( NarrowBand ) and AMR-WB( WideBand ).ĪMR-WB ensures that speech quality is optimized in a mobile station by verifying its ability to determine when to request a change to another codec with either more or less error correction and protection as signal quality changes. It uses link adaptation to select from one of eight different bit rates based on link conditions.ĪMR is an audio format which is extensively used in mobile devices in various applications ranging from normal audio player/recorder to VoIP kind of applications. ![]() AMR was adopted as the standard speech codec by 3GPP in October 1998 and is now widely used in GSM and UMTS. Adaptive Multi-Rate (AMR) is an audio data compression scheme optimized for speech coding. ![]()
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