G.723.1, the highest ITU-T compression ratio
The standard that's opening videoconferencing frontiers!

G.723.1 was adopted in November 1995 by the International Telecommunication Union (ITU-T), a United Nations organization. As compliance with a standard is a key prerequisite for broad market adoption, G.723.1 is well on its way to becoming the videoconferencing standard! Specifically, G.723.1 helps products from different manufacturers and countries communicate with each other.

G.723.1 is a dual-rate speech coder designed for the ITU H.323 and H.324 audio and videoconferencing/telephony standards over regular phone lines. This speech codec specifies how the audio portion of the conference is to be coded. It can perform full duplex compression and decompression functions for multimedia, visual telephony, and videoconferencing products.

With the renowned ACELP®-based (Note 1) algorithm from the Université de Sherbrooke, G.723.1 delivers the highest compression ratio of any of the current ITU-T standards without speech quality compromise. In fact, G.723.1 delivers near toll-quality speech. Plus, it offer dual rates: 6.3 Kbps, based upon the MP-MLQ2 code book search, and 5.3 Kbps, based upon the unique ACELP® system. This codec is targeted for communications applications that need to deliver highly-compressed speech without compromising speech quality at low bit rates.

Implementations of G.723.1 are presently available from VoiceAge® for the
TMS320C5x (Texas Instruments) platform.