Hitachi, Ltd.

Hitachi Computer Engineering Co., Ltd.

Hitachi Information Network, Ltd.

Hiromichi Murakami

Kikuo Hatazawa

Tomoya Nishi

Hiroo Fujisaki

Kenshi Hirai

Tadashi Tsuchiya

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.

Image signal decoding system for decoding modified Huffman codes at high

A print control apparatus includes a page memory and a format memory respectively for receiving and storing a plurality of page data items and a plurality of format data entries which are supplied from a host computer, and is adapted to expand the corresponding page data and format data stored in the memories into dot data to perform overlay operation to thereby output the print data to a printer. The format memory is divided into a plurality of blocks, and the in-use and unused states of each of the blocks are controlled by a control table. The format data is prefetched into blocks in a free state detected by the control table, to thereby prevent the printing operation from being interrupted in case of changing the format data.

Print control apparatus controlling utilization state of plural format

Growing community of inventors

Hadano, Japan

Hiromichi Murakami