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Key Activities: CODING

CODING

The explosion in broadband multimedia applications has made coding a key standardization priority. Coding techniques play a vital role in functions such as encryption, compression, error detection and correction, as well as the multitude of analogue-to-digital conversions and signal processing needed to ensure a wide range of equipment — from simple PC-based modems all the way up to carrier class IP switches and routers — can integrate seamlessly with the public switched network.

Advances in coding have already seen the bandwidth needed to carry a simple human voice track reduced from 64 kbit/s in 1984 to less than 10 kbit/s, while video coding techniques, particularly Recommendation ITU-T H.263, have become a linchpin of the growing range of applications integrating full motion video.

Continued work in this area during the year 2000 saw a new high quality audio coding scheme adopted as an annex to Recommendation ITU-T G.722.1, along with the adoption of new annexes to Recommendation ITU-T H.263, which provide enhanced video coding efficiency and enhanced error resilience. In addition, a new Recommendation, ITU-T V.44, will provide enhanced data compression procedures to supplement those already specified in the well-known and widely adopted ITU-T V.42 bis.

 

 

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Updated : 2002-04-08