What is AMR-WB (Adaptive Multi-Rate Wideband)?

Adaptive Multi-Rate Wideband (AMR-WB) is dependent on Adaptive Multi-Rate encoding. AMR-WB gives enhanced speech quality because of a wider speech bandwidth of 50–7000 Hz as compared to narrowband speech coders. AMR-WB operates, like AMR, with nine distinctive bit rates. The lowest bit rate gives good speech quality in a clean climate is 12.65 kbit/s. Higher bit rates are valuable in background noise conditions and for music.