A new approach of group-based VLC codec system with full table programmability

B. J. Shieh*, Y. S. Lee, Chen-Yi Lee

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

46 Scopus citations


In this paper, the algorithm and architecture of a variable-length-code (VLC) codec system using a new group-based approach and achieving full table programmability are presented. According to the proposed codeword grouping and symbol memory mapping, both group searching and encoding/decoding procedures are completed by applying numerical properties and arithmetic operations to codewords and symbol addresses. By a novel symbol conversion, the memory requirement of the encoding process is reduced and the programmability of codewords and symbols is achieved. For MPEG applications, a 0.6-μm CMOS design that performs concurrent VLC codec processes is shown. This VLSI implementation occupies an area of 5.0 ×4.5 mm2 with 110 k transistors and satisfies a coding table up to 256-entry 12-bit symbols and 16-bit codewords. In addition, both encoding and decoding throughputs of this design achieve 100 Msymbols/s at a 100-MHz clock rate. Therefore, the proposed VLC codec system is suitable for applications which require high operation throughput, such as HDTV, and simultaneous compression and decompression, such as videoconferencing.

Original languageEnglish
Pages (from-to)210-221
Number of pages12
JournalIEEE Transactions on Circuits and Systems for Video Technology
Issue number2
StatePublished - 1 Feb 2001


  • Group-based
  • HDTV
  • Huffman coding
  • VLC codec


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