Sughrue, Mion, Zinn, Macpeak & Seas, PLLC
Variable length code decoder
To provide a VLC decoder having a decoding speed sufficiently high to be applicable for decoding MPEG 2 data, and having an appropriate circuit size to be integrated on an IC chip, a VLC decoder comprises: a first decode table (102) implemented with logic circuits for decoding a "zero-run code" at one clock; a second decode table (104) implemented on a memory device for decoding other VLC making use of a tree searching technique; a switching means (103, 105, 108) for switching from the first decode table (102) to the second decode table (104) when EOB code is decoded and switching from the second decode table (104) to the first decode table (102) when the "zero-run code" begins.
NEC Corporation
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Shigenori Akira
Kinouchi Sawada