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Visual telephony as an ISDN application

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1 Author(s)
Ming L.Liou ; Bellcore, Red Bank, NJ, USA

The key factors deterring the use of visual telephony are identified, and an overview of a typical system architecture is given. The video signal formats and video and audio coding algorithms used are described. Video codec implementation is considered, and an implementation based on application-specific integrated circuits is presented. In particular, three key signal processing modules in the video codec are examined: a discrete cosine transform chip, a motion estimation chip, and a variable-length codec chip. Standardization activities in the video coding area are discussed.<>

Published in:

Communications Magazine, IEEE  (Volume:28 ,  Issue: 2 )