Table device, variable-length encoding device, variable-length decoding device, and variable-length encoding/decoding device

Abstract

A table device includes a match cell number output unit 25 for outputting a match cell number showing a cell PE which outputs a matching signal, and an address decoder 26 for specifying a node from among nodes in a search tree which construct a conversion table, the node corresponding to the match cell number. The table device acquires a data conversion value assigned to the above-mentioned node from a configuration memory 21, and, when the data conversion value is data showing a coded result or the like, outputs the data conversion value to outside the table device, whereas when the data conversion value is a branch code of the search tree, updates the cell PE to which a comparison instruction signal is furnished.

Description

technical field [0001] The present invention relates to a table device which can correspond to various variable-length coding and variable-length decoding including international standard methods, and a variable-length coding device equipped with such a table device, a variable-length decoding device, and a variable-length coding decoding device. Background technique [0002] In the variable length encoding method and the variable length decoding method of moving images, various improvements have been made in consideration of usage and the like, and international standard encoding methods include, for example, H.261, H.263, MPEG1, MPEG2, and MPEG4. [0003] Conventional variable-length coding and decoding devices store table data corresponding to various coding methods in table memory (table data is variable length encoding code, and the encoding length of the variable length encoding code are stored in the address corresponding to the combined data), without insisting on i...

AI Technical Summary

Problems solved by technology

[0021] Since the conventional variable-length coding / decoding apparatus is structured as above, when implementing variable-length coding and variable-length decoding, it is necessary to write configuration data for realizing a search tree into the register group (connection information register group) of each unit. , bit selection register group, comparison target register group, output value register group), but there are problems such as difficulty in speeding up variable-length coding and variable-length decoding processing

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