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An interleaved systolic adaptive architecture for video ghost elimination

Thomas, J (1995) An interleaved systolic adaptive architecture for video ghost elimination. In: 1st IWPP. Parallel Processing. Proceedings of the First International Workshop on Parallel Processing (IWPP-94), 26-31 Dec. 1994, Bangalore, India, pp. 545-550.

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Abstract

The elimination of shifted and attenuated replicas of the main image caused by multipath propagation in video transmission has been generating increased interest. We present a delayed least mean squares (DLMS) traversal, systolic pipelined adaptive filter which supports an adequately high sampling rate. We do not introduce any tracking delay for systolization while requiring significantly reduced adaptation delay and silicon area, and providing a sufficient high SNR in the de-ghosted image. Both pre-ghosts and post-ghosts are efficiently cancelled. The modularity of the system permits filter-order scaling without additional design effort or a degradation in the system clock rate. We achieve systolization by first creating an f-slow simulator of the DLMS algorithm, with a system clock rate that is f times the sampling rate, and then folding the adaptation and filtering computations of each tap on to a single multiply-accumulate hardware module. We further pipeline the system to the level of a 4→2 compressor using carry-save arithmetic for both the multiply and the add operations, so that the system sustains a sampling rate of $1/(ft_A)$, where $t_A$ is the combinational delay through the compressor. We use the horizontal synchronization pulse as our ghost cancelling reference. This has all the desired features of a good adaptation reference signal and ensures that the system impulse response is updated once in every horizontal retrace. We adapt during the first clock cycle and filter during the remaining (f-1) clock cycles of each sampling period, so that these operations are interleaved with each other

Item Type: Conference Paper
Additional Information: Copyright of this article belongs to Tata McGraw-Hill.
Keywords: adaptive filters;carry logic;delays;echo suppression;high definition television;least mean squares methods;signal processing equipment;special purpose computers;synchronisation;systolic arrays;telecommunication computing;television interference;video signal processing
Department/Centre: Division of Electrical Sciences > Electrical Communication Engineering
Date Deposited: 05 Sep 2007
Last Modified: 10 Jan 2012 08:53
URI: http://eprints.iisc.ernet.in/id/eprint/10835

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