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G.721 Last modified: Wednesday, May 07, 2008
An International Telecommunications Union (ITU-T) standard for for audio (speech) compression and decompression that is used in digital transmission systems, and in particular, used for the coding of analog signals into digital signals. G.721 is an ITU-T standard codec that uses Adaptive Differential Pulse Code Modulation (ADPCM); a form of Pulse Code Modulation (PCM), to produce a digital signal with a lower bit rate than standard PCM. This ITU standard for speech codecs uses ADPCM on a  32 kbit/s channel. NOTE: G.721 was first introduced in 1984. In 1990 this standard was folded into G.726 along with G.723. (See also ADPCM). See G.7xx for more information on how these standards are used in telephony networks.
Enterprise VoIP Planet The IT Manager's Guide to Voice over IP ITU Recommendation G.721 32 kbit/s adaptive differential pulse code modulation (ADPCM) Six Steps to Getting Your Network Ready for Voice over IP Using low bandwidth CODECs helps reduce bandwidth requirements however due to the overhead of IP, UDP and RTP protocols, such reduction is limited. The International Telecommunication Union The International Telecommunication Union is an international organization within which governments and the private sector coordinate global telecom networks and services. This home page offers numerous links to highlights and current topics, standardization, radiocommunication, telecommunication, and general secretariat sectors. Webopedia's Quick Reference Section Use this Webopedia reference section for information on common Internet and computer facts and occurrences.	Related Categories Internet Protocols Standards Telecommunications Related Terms analog channel codec compression G.711 G.722 G.723 G.726 G.727 G.728 G.729 G.7xx Internet Protocol Internet telephony ITU PCM telecommunications VoIP Shopping G 721 Products Compare Products,Prices and Stores Shop by Category: Sport and Outdoor 15 Store Offers Wireless Adapters 7 Model Matches PC Desktops 2 Model Matches Personal Care 0 Store Offers Tools and Accessories 6 Store Offers