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International Telecommunication Union is an international organization within which governments and the private sector coordinate global telecom networks and services.
The International Telecommunication Union Telecom Standardization Sector (ITU-T) is a permanent organ of the ITU. The ITU-T is responsible for studying technical, operating and tariff questions and issuing Recommendations on them with a view to standardizing telecommunications on a worldwide basis.
The recommentations for the
G-series are proposed for transmission systems and media, digital systems and networks.
Internet telephony services must operate in a bandwidth-, delay-, loss- and cost-constrained environment. In the following three ITU codecs are proposed which have been designed to work well in the presence of these constraints. |
| G.728 Is a 16kbit/s speech coder with a very low delay but with a hugh computational complexity (30 MIPS, 2000 words RAM). Therefore the required power and the costs are considerable. |
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G.729
8 kbit/s Conjugate-Structure Algebraic-Code-Excided Linear-Prediction (CS-ACELP) |
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G.723.1
Dual Rate Speech Coder for Multimedia Communications Transmitting at 5.3 and 6.3 kbit/s. 6.3 kbit/s MP-MLQ 5.3 kbit/s ACELP |
| G.729 Annex A |