G.722[1] is a ITU-T standard wideband speech codec operating at 48, 56 and 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 AMR-WB (“Adaptive Multirate Wideband”), 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 16 kHz, double that of traditional telephony interfaces, which results in superior audio quality and clarity.
G.722 is an ITU standard codec that provides 7 kHz wideband audio at data rates from 48, 56 and 64 kbit/s. This is useful in fixed network voice over IP applications, where the required bandwidth is typically not prohibitive, and offers a significant improvement in speech quality over older narrowband codecs such as G.711, without an excessive increase in implementation complexity. Environments where bandwidth is more constrained may prefer one of the more bit-efficient codecs, such as G.722.1 (Siren7) or G.722.2 (AMR-WB).
