Variable-length code decoder using barrel shifters and a look-up table
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United States of America Patent
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Dec 31, 2002
Grant Date -
Oct 4, 2001
app pub date -
Mar 23, 2001
filing date -
Mar 24, 2000
priority date (Note) -
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status (Latency Note)
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Abstract
A variable-length code decoder sequentially decodes a series of variable-length codewords included in a bit stream and outputs decoded symbols corresponding to the codewords. The decoder includes an interface section and a decoding section. The interface section accumulates various code lengths of the decoded codewords to obtain a sum. Next, the interface section selects an N-bit contiguous data sequence (where N is a maximum code length of the codewords) from a 2N- or (2N-1)-bit contiguous data sequence, included in the bit stream, in accordance with the sum and outputs the N-bit contiguous data sequence. The decoding section receives the output of the interface section and decodes a codeword included in a combination of the output and a previous output of the interface section by reference to a lookup table, thereby obtaining and outputting a decoded symbol and outputting a code length of the decoded codeword to the interface section.
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