Chrominance/Luminance Signal Separation and Syntheses Chips Developed with a DSP Silicon Compiler

Takashi Miyazaki, Takao Nishitani, Masaki Ishikawa, Masato Edahiro, Kaoru Mitsuhashi

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

This paper presents luminance/chrominance (Y/C) separation and synthesis VLSI chips developed with an application-specific silicon compiler. The Y/C separation chip separates Y/C components from a 13.5-MHz sampled composite TV signal for a common intermediate format (CIF) video signal, by using a formula Omitteddown-sampled luminance signal (Y) and two formula Omitted downsampled color-difference signals (CR, CB). The Y/C synthesis chip synthesizes the composite signal from Y, CR, and CB. In order to develop compact chips, three different FIR filter structures, such as a filter with symmetric coefficients, a decimator, and an interpolator, are first designed to have a minimum number of multiply-adders. In addition to these filter structures, multipliers in the filters are newly designed by using canonical signed-digit representation (CSR) for filter coefficients. Restriction of the number of nonzero digits in the CSR leads to reduction in number of adder units in the multiplier and its compact realization. The structures of the filters and the CSR multipliers are then employed as a design database of the silicon compiler. The silicon compiler provides a filter design environment considering usage of the CSR multipliers. Therefore, FIR filter modules with the desired filter specifications are automatically generated. The optimized filter and CSR multiplier structures allow the Y/C separation chip with an FIR filter and three FIR decimators to be implemented in a 10.4 × 11.7 mm2 area, using 1.2 μm CMOS technology. The Y/C synthesis chip with three FIR interpolators is also fabricated in a 10.8 ×11.8 mm2 die size. These chips help to develop compact and cost-effective video systems, such as TV conference systems and TV phones.

Original languageEnglish
Pages (from-to)245-254
Number of pages10
JournalIEEE Transactions on Circuits and Systems for Video Technology
Volume2
Issue number2
DOIs
Publication statusPublished - 1992 Jun
Externally publishedYes

ASJC Scopus subject areas

  • Media Technology
  • Electrical and Electronic Engineering

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