Hitachi, Ltd.

Ichiro Masse

Takanori Miyamoto

Takashi Morita

Tohru Kazawa

Shigeo Nishita

Souichi Yamashita

Toshiroh Suzuki

Toshiro Suzuki

Eiichi Amada

A screen communication method and system for communicating screen data between a plurality of interconnected terminal units each having a display part and an input part, wherein each time screen modifying data is input from the display part, each of the terminal units transmits a modifying right request to another terminal unit before transmitting the screen modifying data, and obtains a modifying right under such a condition that each terminal unit receives no screen modifying request from another terminal unit within a predetermined period of time after the transmission of the first modifying right request.

Screen communications system granting screen modifying requests if no

Clock timing is extracted from N level, multilevel codes of megabits per second data by determining a baud clock among the N-1 possible clocks synchronized to all the level cross points. A discriminator is used with a clock and if correct information is not obtained, the clock is changed.

Timing extraction method and communication system

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Yokohama, Japan

Ichiro Masse