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AMR, Adaptive Multi-Rate Speech Codec
https://www.loc.gov/preservation/digital/formats/fdd/fdd000254.shtml
Format Description for AMR -- Audio data compression scheme optimized for speech coding, adopted in October 1998 as the standard speech codec by 3GPP (3d Generation Partnership Project) and now widely used in GSM (Global System for Mobile Communications). The AMR bit rates of 12.2, 10.2, 7.95, 7.40, 6.70, 5.90, 5.15 and 4.75 kb/s are based on frames …
AMR Audio Codec SDK Libraries for Windows, .NET …
https://www.leadtools.com/sdk/multimedia/codecs/amr
AMR Audio Codec SDK Libraries LEADTOOLS includes Adaptive Multi-Rate (AMR) audio encoders and decoders for DirectShow and Media Foundation. These codecs compress and decompress audio data using the AMR standard. Full AMR Audio Codec Libraries Adaptive Multi-Rate compression is optimized to encode and decode speech audio.
CODECPRO AMR CODEC - optimized codec solutions for ...
https://codecpro.com/en/codecs/codec_specifications/10/AMR
3GPP MANDATORY STANDARD CODEC AMR was designed to allow transcoder-free connectivity between GSM, US-TDMA and PDC networks; AMR is the 3GPP mandatory standard codec for narrowband speech over GSM, WCDMA, GPRS and EDGE networks. AMR operates at 8 bitrates in the range of 4.75 to 12.2 kbps and was specifically designed to improve link robustness.
AMR Player, Free AMR audio player and AMR to MP3 or …
http://www.amrplayer.com/
What is Adaptive Multi-Rate (AMR) 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.
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