What Does G.721 Mean?
G.721 is an obsolete ITU-T Recommendation that is now superseded by standard G.726. The title of the defunct specification is “32 kbit/s adaptive differential pulse code modulation (ADPCM).” The standard was one of the ITU-T G series, which is titled “Transmission systems and media, digital systems and networks.” ADPCM is a technology used to encode digital audio.
Techopedia Explains G.721
The International Telecommunication Union (ITU) is an arm of the United Nations that deals with information and communication technologies. ITU-T is a subset of that agency called the Telecommunication Standardization Sector. Among the many standards specified by the organization are the G Series Recommendations. As with any vibrant standards organization, these specifications are under a constant state of development and improvement.
