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Definition: AMR

(1) (Adaptive Multi-Rate) A variable rate speech codec selected by the 3GPP for the 3G evolution of the GSM cellphone system (WCDMA). Using the Algebraic CELP (ACELP) compression technology, AMR provides toll quality sound at transmission rates from 4.75 to 12.2 Kbps. See WCDMA.

(2) (Audio/Modem Riser) See riser card.