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Proceedings Paper

New fully adaptive DPCM system for high-speed video applications
Author(s): Joseph R. Thomas
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Paper Abstract

This paper reports a new fully adaptive DPCM architecture targeted at meeting high-speed video source coding requirements. THe presence of two feedback loops in the ADPCM computational scheme, viz., the feedback necessary for the prediction, and that necessary for adapting the prediction, inherently limit the sampling rate that can be supported. In order to systolize/pipeline these computations we delay both the adaptation and prediction computations so that the required algorithmic delays are now available in the feedback loops. We create a 2-slow simulator of the system, use a system clock that is twice as fast as the sample rate, retime register delays to systolize/pipeline the computations, and project the prediction and adaptation computations onto a common set of multiply accumulate processor modules. This yields pipelined systolic arrays for both the coder and the decoder, using significantly reduced adaptation delay and minimal algorithmic modifications compared with recently proposed architectures, implying improved convergence behavior of the adaptive predictions and higher SNR in the received video frame at high sample rates, besides a hardware efficient, reduced area implementation.

Paper Details

Date Published: 14 November 1996
PDF: 7 pages
Proc. SPIE 2847, Applications of Digital Image Processing XIX, (14 November 1996); doi: 10.1117/12.258260
Show Author Affiliations
Joseph R. Thomas, SGS-Thomson Microelectronics SA (France)

Published in SPIE Proceedings Vol. 2847:
Applications of Digital Image Processing XIX
Andrew G. Tescher, Editor(s)

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