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What is Adaptive Multi-Rate (AMR)? - Definition from ...

    https://www.techopedia.com/definition/31059/adaptive-multi-rate-amr
    Adaptive Multi-Rate is a codec based on an audio compression format which is used for speech coding. It is considered a hybrid of speech codes and is capable of transmitting both waveform signals and speech parameters. For most third-generation (3G) cellular systems it is a mandatory speech codec and is a preferred codec for the Global System for Mobile Communications …

AMR Player, Free AMR audio player and AMR to MP3 or …

    http://www.amrplayer.com/
    Adaptive Multi-Rate (AMR) is an audio data compression scheme optimized for speech coding. AMR was adopted as the standard speech codec by 3GPP in October 1998 and is now widely used in GSM and UMTS. It uses link adaptation to select from one of eight different bit rates based on link conditions.

AMR - Adaptive Multi-Rate Codec File

    https://docs.fileformat.com/audio/amr/
    The AMR( Adaptive Multi-Rate ) is an audio format; widely used in various mobile applications and devices, typically in audio player/recorder or in VoIP kind of applications. AMR can be further classified as: AMR-NB( NarrowBand ) AMR-WB( WideBand ) Usually, AMR refers to AMR-NB. The AMR file format has the following structure:

AMR, Adaptive Multi-Rate Speech Codec

    https://www.loc.gov/preservation/digital/formats/fdd/fdd000254.shtml
    From the VoiceAge Web site (consulted in April 2007): The proven, highly efficient and very robust AMR (Adaptive Multi-Rate) narrowband codec is the 3GPP mandatory standard codec for narrowband speech and multimedia messaging services over 2.5G/3G wireless systems based on evolved GSM core networks (WCDMA, EDGE, GPRS). . . . AMR operating at various bit …

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