G.722

G.722 is a standard for high-quality digital voice communications that is expected to lead to increased use in Voice over Internet Protocol (VoIP)... (Continued)

G.722 is a standard for high-quality digital voice communications that is expected to lead to increased use in Voice over Internet Protocol (VoIP). G.722 employs subband adaptive differential pulse-code modulation (SB-ADPCM) at 48, 56 or 64 kilobits per second (Kbps) using an input sample rate of 16 kilohertz (kHz).

G.722 provides an analog sound range of 50 hertz (Hz) to 7 kHz for high-fidelity speech communications. This compares with a nominal audio bandpass of 50 Hz to 3.4 kHz for most other codecs. When network traffic is heavy, bandwidth is automatically conserved by means of a higher-than-usual ratio of digital compression. When network traffic is normal, a low-compression algorithm is used.

In addition to its appeal to VoIP vendors, G.722 may gain widespread acceptance in wireless communications systems, personal communications services, videoconference applications and General Packet Radio Service (GPRS).

This was first published in August 2009

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