Universal VBR videocodecs for ATM networks in the Belgian Broadband Experiment

摘要

This paper deals with digital television coding schemes for transmission on ATM networks. The proposed TV codec aims to reduce the incoming TV bit-rate of 216 Mbit/s by a factor of 6 to 100 to eliminate most of the redundant information. Most of the first videocodecs were designed to transmit on STM channels at constant bit-rate (CBR); therefore, this paper intends to present all the adaptations to be realized to transform this type of videocodecs into a variable bit-rate (VBR) universal videocodec suitable in the ATM environment for both distributive and interactive video services. Throughout the paper, the hardware (VLSI) videocodec realized for the ATM Belgian Broadband Experiment is taken as an example of a VBR videocodec.