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公开(公告)号：EP0188251B1
公开(公告)日：1990-08-22
申请号：EP86100297.0
申请日：1986-01-10
IPC分类号： H04L12/28
CPC分类号： H04L12/4015 , H04L12/4135
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公开(公告)号：EP0737013A3
公开(公告)日：1999-01-07
申请号：EP96105124.0
申请日：1996-03-29
发明人： Ema, Nobuyuki , Hibi, Keiichi , Nakabayashi, Jiro , Iwano, Tsuneaki , Nakamura, Osamu , Kanada, Youji , Kura, Tsuneko , Oshima, Takashi
IPC分类号： H04N7/26
CPC分类号： H04N19/40 , H04N19/577
摘要： A video storage type communication device which is capable of storing coded video data received from a terminal and reproducing required video information by rapid forwarding or reversing at any desired frame rate at the terminal independent of the terminal specification. A video storage type communication device which comprises a transmitting portion (17) for transmitting video data and a receiving portion (11) for receiving video data over a communication line, a video storage portion (15) for storing received video data and a communication control portion (14) for carrying-out video-communications by controlling the above-mentioned portions. The device is further provided with a refresh image detecting portion (12) for judging, from the received coded video data, whether the received coded information is a refresh image, a storage control portion (13) for storing into the video storage portion (15) the coded video data received by the receiving portion (11) by previously adding thereto inter-frame or intra-frame prediction coded information detected by the refresh image detecting portion (12) and a terminal control portion (20) for sending at a desired interval a request for updating display image through a communication control portion (14) to a terminal during storing video information.
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公开(公告)号：EP0187679B1
公开(公告)日：1991-12-27
申请号：EP86100298.8
申请日：1986-01-10
IPC分类号： H04L12/40
CPC分类号： H04L12/4015 , H04L12/4135 , H04L2012/4026
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公开(公告)号：EP0187679A3
公开(公告)日：1988-06-08
申请号：EP86100298
申请日：1986-01-10
IPC分类号： H04L11/16
CPC分类号： H04L12/4015 , H04L12/4135 , H04L2012/4026
摘要： A data transmission system that permits data with the top priority to be transmitted preceding the other data when collision occurs in a data transmission network with a plurality of terminals. Each terminal (A, B, C) monitors the bus for a predetermined period (Tp) after the bus line becomes empty but immediately before the terminal is ready for data transmission so that, on detecting a signal on the bus during this predetermined period (Tp), the terminal starts transmitting data synchronously with the detected signal. As a result, data with the top priority is always allowed to pass through the circuit preceding other data despite a cl6ck pulse difference between the terminals.
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公开(公告)号：EP0188251A1
公开(公告)日：1986-07-23
申请号：EP86100297.0
申请日：1986-01-10
IPC分类号： H04L12/28
CPC分类号： H04L12/4015 , H04L12/4135
摘要： A signal transmission system which constantly allows data with the top priority to pass preceding others in a bus-type network. In transmitting a packet consisting of a plurality of start-synchronized frames, the bus is monitored for a predetermined period after the first frame transmission. If a frame-start signal is detected during this predetermined period, the next frame is promptly transmitted synchronously with the detected frame-start signal. If no frame-start signal is detected during this period, the next frame is transmitted immediately after the predetermined period elapses. As a result, each frame by a transmitting terminal starts at the same time as that by another terminal. Therefore, so long as the clock pulse error between the different terminals is small enough to permit a frame transmission, the terminals can detect collision for each frame. As soon as either of the terminals detects collision, it stops data transmission, whereby a packet with the top priority is always permitted to pass.
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