G7222

G.722.2, also known as Adaptive Multi-Rate Wideband (AMR-WB), is an ITU-T standard for a speech and audio codec designed for efficient transmission over packet-based networks. It is widely used in IP telephony, VoIP, and mobile networks where bandwidth can vary, and it is closely associated with the AMR-WB family defined by 3GPP for cellular communications.

Technically, G.722.2 defines a wideband coder that operates at a sampling rate capable of conveying a wider frequency range than traditional narrowband codecs, resulting in improved intelligibility and naturalness of speech. The codec uses a CELP-like algorithm with multiple bitrate modes, enabling operation over a range of bitrates to suit network conditions and quality requirements. Typical deployments support dynamic switching between modes, balancing compression efficiency and audio quality. The specification also includes mechanisms for error resilience and packet loss concealment to maintain intelligibility in lossy networks. Frame lengths are commonly aligned with standard telecommunication blocks, such as 20 milliseconds, to support synchronization with other network processes.

Adoption and usage are widespread in both mobile and IP-based communications. G.722.2 is the ITU-T standard that underpins AMR-WB in many networks and is implemented in numerous VoIP platforms, conferencing systems, and multimedia endpoints. It is also reflected in 3GPP specifications for AMR-WB and has been licensed in patent portfolios, affecting how implementations are deployed or integrated in products and services.

See also: AMR-WB, G.722, ITU-T G.722 family.