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GSM Audio Codec: Vocoder: AMR, CELP etc .. » …
https://www.electronics-notes.com/articles/connectivity/2g-gsm/audio-codecs-vocoders-amr-celp.php
GSM AMR Codec The AMR, Adaptive Multi-rate codec is now the most widely used GSM codec. The AMR codec was adopted by 3GPP in October 1988 and it is used for both GSM and circuit switched UMTS / WCDMA voice calls. The AMR codec provides a variety of options for one of eight different bit rates as described in the table below.
AMR, Adaptive Multi-Rate Speech Codec - Library of …
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 …
G.722.2 GSM-AMR WB Audio Coder | Adaptive Digital
https://www.adaptivedigital.com/g-722-2/
G.722.2 | GSM-AMR WB AUDIO CODER INCLUDES plc AND dtx G.722.2 AMR-WB Provides advanced voice quality over the existing narrow-band standards Features List Functions are C-callable Multi–Channel Implementation Completely re–entrant (Channel can interrupt any Channel, any time) The encoder and decoder meet all ITU G.722.2 compliance data files
GSM AMR basics | Adaptive Multi Rate | AMR
https://www.rfwireless-world.com/Terminology/GSM-AMR-basics.html
AMR (Adaptive Multi-Rate) concept is used in GSM mobile, where speech codec rate is changed based on signal quality (i.e. C/I). Different rates are available based on redundancy required to be introduced based on carrier to interference ratio (C/I), which provides less or …
How To Fix Amr-nb Codec – Bashogist
https://bashogist.com/en/amr-nb-codec/
Adaptive Multi-Rate Audio Codec (AMR or amr-nb GSM-AMR) is an audio print format optimized for speech encoding. The AMR codec language is a huge multi-rate narrowband codec language that encodes narrowband signals (200-3400 Hz) with variable bitrates from 4.75 to 12.2 kbps, and quality over long distances [3 ] starting at 7.4 kbps.
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