New distributed arithmetic algorithm and its application to IDCT

Tian-Sheuan Chang*, C. Chen, C. W. Jen

*Corresponding author for this work

Research output: Contribution to journalArticle

21 Scopus citations

Abstract

Distributed arithmetic (DA) has been widely used to implement inner product computations with a fixed input. Conventional ROM-based DA suffers from large ROM requirements. A new DA algorithm is proposed that expands the fixed input instead of the variable input into bit level as in ROM-based DA. Thus the new DA algorithm can take advantage of shared partial sum-of-products and sparse nonzero bits in the fixed input to reduce the number of computations. Unlike ROM-based DA that stores the precomputed results the new DA algorithm uses a predefined structure to compute results. When applied to a 1-D eight-point DCT system the new DA algorithm only needs 30% of hardware area and has faster speed as compared with ROM-based DA. To illustrate the efficiency of the proposed algorithm a 2-D IDCT chip was implemented using 0.8 μm SPDM CMOS technology. The chip with size 4575 × 5525 μm can deliver a processing rate of 50 M pixels per second.

Original languageEnglish
Pages (from-to)159-163
Number of pages5
JournalIEE Proceedings: Circuits, Devices and Systems
Volume146
Issue number4
DOIs
StatePublished - 1 Dec 1999

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