An ITU-T recommendation for a Dual Rate Speech Coder for Multimedia Communications Transmitting at 5.3- and 6.3-Kbps.
A standard recommended by the ITU in 1995 that described a way of digitally coding voice, for communications over a packet network. While the standard was designed for use over private packet networks, it was first used for communications over the public Internet relying on the Internet Protocol ( IP), for which it was not designed. G.723.1 is part of H.323.
speech encoding/decoding standard at 5.6 Kbps or 6.3 Kbps.
6.4/5.3 kbps MP-MLQ codec (low quality, low bandwidth, high processor load due to the compression)
An ITU-T double rate CELP codec (6.4/5.3 kbps, medium quality, high processor load).
Describes a compression technique that can be used for compressing speech or audio signal components at a very low bit rate as part of the H.324 family of standards. This CODEC has two bit rates associated with it: 5.3 and 6.3 kbps. The higher bit rate is based on ML-MLQ technology and provides a somewhat higher quality of sound. The lower bit rate is based on CELP and provides system designers with additional flexibility. Described in the ITU-T standard in its G-series recommendations.
Speech coders: Dual rate speech coder for multimedia communications transmitting at 5.3 and 6.3 kbit/s.
An ITU standard for voice compression.
ITU-T recommendation: speech encoding/decoding with a low bit rate, high output quality. This is the default encoder required for H.323 compliance. G.723.1 is a subset of G.723.
Codinng of speech at 5.3 / 6.3 Kbps
G.723.1 is an audio codec for voice that compresses voice audio in chunks of 30 milliseconds. A look-ahead of 7.5 ms duration is also used. Music or tones such as DTMF or fax tones cannot be transported reliably with this CODEC, and thus some other method such as G.711 or out-of-band methods should be used to transport these signals.