Image signal decoding system for decoding modified Huffman codes at high speeds
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United States of America Patent
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Dec 7, 1993
Grant Date -
N/A
app pub date -
Aug 1, 1991
filing date -
Aug 1, 1990
priority date (Note) -
Expired
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Abstract
An image signal decoding system for decoding a variable length image data compressed by a modified Huffman code. The decoding object data is cut by a fixed length of 13 bits and the cut data is decoded by using a decode-encode circuit for decoding the input of the modified Huffman code with its end portion equalized and for encoding and generating the code length, the code kind and the run-length number on the basis of the decoded contents, and by using a rotator for shifting the bit data. For decoding a code which immediately follows, the data is shifted with the rotator by the bit number of the code length of the decoding output result, the end portion of the next decoding output result, the end portion of the next decoding object data is equalized with the input end portion of the encode-decode circuit, and it is placed after the immediately following decoding object data and is then input into the decode-encode circuit and decoded.
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