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A variable-bit-rate HDTV codec based on a motion-adaptive DCT and multimode quantisation is developed for ATM environments in B-ISDN. Adaptive 2-layered coding and error concealment are implemented to keep picture quality high by compensating for ATM cell loss. The codec hardware restricts the peak bit rate to 65 Mbit/s for HDTV conference application and to 130 Mbit/s for secondary distribution....
An experimental study of an HDTV codec for transmission in an ATM environment is described. An ATM cell loss compensation scheme is achieved using techniques of two-layered coding, block-interleaving, and data transposition with cell loss detection. Experimental evaluation confirms that the cell loss compensation improves the error rate characteristics of at least three figures for random and burst...
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