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1. 发明专利

JPH01177755A VOICE SIGNAL TRANSMISSION CIRCUIT 失效
公开(公告)号：JPH01177755A
公开(公告)日：1989-07-14
申请号：JP123188
申请日：1988-01-08
申请人： HITACHI LTD , HITACHI ENG CO LTD
发明人： KAKIZUME YUJI , YOSHINO HIDEKI , NOGUCHI HIROYUKI , TATSUNAMI KAZUHIRO , OGURA TATSUO , SANBONKAN KOUICHI
IPC分类号： H04M9/00
摘要： PURPOSE:To reduce the cost of wiring by connecting a transmitter output and a receiver input in series by means of respective transformers, and connecting plural pieces of this series circuit in a loop. CONSTITUTION:The transformer 214 for transmitter and that 224 for receiver are connected in series, and plural pieces of resulting series circuits are connected in a loop. Accordingly, output signals from respective transmitters 10 connected in the loop drive the same load, hence voice signals can be mixed. Also, since the same current in the loop drives respective receivers 20, also the same voice signal can be heard at the receivers 20. Since the loop is formed, the wiring cost can be reduced.

2. 发明专利

JPS6485443A NETWORK SYSTEM FOR SERIAL TRANSMISSION LINE 失效
公开(公告)号：JPS6485443A
公开(公告)日：1989-03-30
申请号：JP24074887
申请日：1987-09-28
申请人： HITACHI LTD , HITACHI ENG CO LTD
发明人： YOSHINO HIDEKI , OGURA TATSUO , MIMOTOSUGA KOUICHI , NOGUCHI HIROYUKI , MIYAJIMA NORIYUKI
摘要： PURPOSE:To output an interrupt request from a node to a network controller by providing an interruption request line from each node to the network controller in addition to a serial data transmission line. CONSTITUTION:In requesting interruption by a node 2 to a network controller 1, the node 2 outputs an interruption request 5 to the interruption request line 4. In receiving the interruption from the interruption request line 4, the network controller 1 instructs an interruption request output OFF to all nodes connected to the network. In applying polling instructing an interruption request output ON sequentially to each node, the network controller 1 outputs the interruption request to the interruption request line when the interruption output ON is instructed to the node applying the interruption request and the network controller can recognize the node giving the interruption request. Moreover, the network controller applies polling to all nodes, the simultaneous interruption request from plural nodes is coped with, as well.

3. 发明专利

JPH01255884A IMAGE DISPLAY SIGNAL TRANSMITTER 失效
公开(公告)号：JPH01255884A
公开(公告)日：1989-10-12
申请号：JP8439588
申请日：1988-04-06
申请人： HITACHI LTD , HITACHI ENG CO LTD
发明人： KAKIZUME YUJI , TATSUNAMI KAZUHIRO , OGURA TATSUO
IPC分类号： G09B5/02 , G06Q50/00 , G06Q50/10 , G06Q50/20 , G09G1/00 , G09G5/00 , G09G5/12 , G09G5/30
摘要： PURPOSE:To display synthetic modifying information before a synthesis and after the synthesis on a display device by fetching the storage information of an arbitrary display device to a modifying means, synthesizing it with modifying information inputted by a modification input means and displaying it on the display device. CONSTITUTION:In accordance with the control command of a control personal computer 200, storage information of a personal computer 500 is connected to a modifying means 100 through a transmission line by switching the switching means 300 of each display device 600. Subsequently, modifying information inputted from a modification input means 400 is stored in a storage means provided on the modifying means 100, and by the storage information and the modifying information are synthesized by a synchronizing signal of the storage information of the personal computer 500, and outputted as synthetic modifying information. Next, the switching means 300 is switched by the control command of the control personal computer 200, and by connecting an arbitrary image display means 600 to the transmission line, the information is synthesized by the modifying means 100. In such a way, before a correction and after the correction, the state of a memory of the inside of the personal computer 500 is not varied, and the correction guidance can be executed easily.

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