G.722 is a ITU-T standard wideband speech codec operating at 32-64 kbit/s. Technology of the codec is based on split band ADPCM.
G.722.1 offers lower bit-rate compressions. A more recent variant, G.722.2, also known as "Adaptive Multirate Wideband" (AMR-WB) offers even lower bit-rate compressions, as well as the ability to quickly adapt to varying compressions as the network topography mutates. In the latter case, bandwidth is automatically conserved when network congestion is high. When congestion returns to a normal level, a lower-compression, higher-quality bitrate is restored.
G.722 and its variants sample audio data at a rate of 16kHz, double that of traditional telephony interfaces, which results in superior audio quality and clarity.
