Hitachi, Ltd.

Hitachi Computer Engineering Co., Ltd.

Hitachi Information Network, Ltd.

Tomoya Nishi

Kenji Suzuki

Hiroo Fujisaki

Mitsuhiro Amari

Toshiyuki Takagi

Hiromichi Murakami

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 memory control system connects, by a single memory bus, plural memories that are individually operable and plural memory access source units so as to effectively use the single memory bus. The memory control system includes a memory request acceptance unit that permits each memory access source unit access to the memories on the basis of the type of access request from each memory access source unit and the type of access request in the memory that is in operation.

Memory control system

The line size of character lines constituting a page of print paper is compared with the limited line size. If a line has its line size larger than the limited line size, it is divided into several lines having a smaller line size. An edit control circuit appends a divisional character code to each divided portion of a character which is divided into several lines. An expansion control circuit receives a divisional character code, extracts the divided portion of the character from the patterns of available characters and writes it into a line buffer memory. Patterns in the line buffer memory are written sequentially into a page memory which stores patterns of characters printed in a page of print paper.

Printer controller

Growing community of inventors

Hadano, Japan

Tomoya Nishi