专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

91. 发明专利

JPH09252284A BURST SIGNAL COLLISION DETECTION CIRCUIT 失效
公开(公告)号：JPH09252284A
公开(公告)日：1997-09-22
申请号：JP8763096
申请日：1996-03-15
申请人： NEC CORP
发明人： SAEGUSA NAOTAKA
IPC分类号： H04B10/07 , H04B10/079 , H04B10/272 , H04J14/08 , H04L12/40 , H04L12/407 , H04L12/413 , H04L25/30 , H04B10/08
摘要： PROBLEM TO BE SOLVED: To provide a circuit to detect collision of a burst signal in a burst data transmission system. SOLUTION: The collision detection circuit having a level monitor 15 measuring a level of a reception signal 11 and a comparator 17 comparing a level of the reception signal with a threshold level signal is provided with a means using a level of burst signals while switching the level of the plural signals received normally for a threshold level to be fed to the comparator 17. In more details, the detection circuit has a storage device 16 that stores only a level of a normal state and provides an output of a level of a preceding normal state in parallel based on a normal state signal 14 denoting the normally received burst signal subject to time division for each sender according to a switching signal 12 to inform an expected sender among the plural senders.

92. 发明专利

JPH09502851A 失效
公开(公告)号：JPH09502851A
公开(公告)日：1997-03-18
申请号：JP50376696
申请日：1995-06-29
IPC分类号： H04J3/24 , H04L7/00 , H04L12/40 , H04L12/407 , H04L12/417 , H04L12/64 , H04N7/24 , H04N7/26 , H04N7/50 , H04N7/52 , H04N7/10

93. 发明专利

JPH08223194A MULTIPLEX TRANSMISSION SYSTEM AND MULTIPLEX TRANSMISSION METHOD 失效
公开(公告)号：JPH08223194A
公开(公告)日：1996-08-30
申请号：JP4787795
申请日：1995-02-14
申请人： SONY CORP
发明人： OTOBE TAKASHI
IPC分类号： H04J1/00 , H04L12/40 , H04L12/407 , H04N7/173 , H04N21/4788
摘要： PURPOSE: To reduce the number of wires required for multiplexing and transmitting information among plural terminal equipments sharing a single physical transmission medium, to equally and autonomously transmit the large volume of data mutually among respective terminals and to easily expand a system. CONSTITUTION: As the terminal equipments, four VTRs 11 to 14, a video camera 15 and a monitor 16 are mutually connected in a bus shape by a coaxial cable 17 as the physical transmission medium. All the respective terminal equipments are equal and not in master-slave relation at the time of securing a transmission right and respectively perform transmission by a frequency multiplex system by autonomously securing the transmission right (frequency channel). To put it concretely, the respective terminal equipments set unique frequency channels with the other terminal equipments by utilizing the frequency channel for control in common to all the terminal equipments in a time-division manner and mutually exchanging control information with the other terminal equipments and transmit the data among the respective terminal equipments by utilizing the set frequency channel.

94. 发明专利

JP2509307B2 失效
公开(公告)号：JP2509307B2
公开(公告)日：1996-06-19
申请号：JP20536388
申请日：1988-08-18
申请人： FUJITSU LTD
发明人： SHINOMYA TOMOHIRO , AMAMYA SHIGEO , IGUCHI KAZUO , SOEJIMA TETSUO
IPC分类号： H04B10/00 , H04B10/07 , H04B10/27 , H04L12/40 , H04L12/403 , H04L12/407 , H04Q5/00

95. 发明专利

JPH0614007A SPREAD SPECTRUM COMMUNICATION SYSTEM 失效
公开(公告)号：JPH0614007A
公开(公告)日：1994-01-21
申请号：JP16978392
申请日：1992-06-29
申请人： NEC CORP
发明人： OSHIMA IZUMI
IPC分类号： H04J3/00 , H04J13/00 , H04J13/10 , H04L12/40 , H04L12/407
摘要： PURPOSE:To improve the efficiency of data transfer in the spread spectrum communication system comprising a bus network. CONSTITUTION:The system is provided with SS communication equipments 1A-1D having PN code generating circuits 12A... connected via a transmission line 3 and generating a TDMA M series code M1 and a CDMA M series code M2 and having communication control sections 11A... controlling the PN code generating circuits 12A... respectively. The system is provided with a CDMA controller 2 having a PN code generating circuit 22 connecting to the transmission line 3 and generating the M series code M1. In the steady-state with less communication data quantity, data transfer is instructed by the TDMA using the M series code M1 for the communication control section 11A.... When the communication data quantity is much, the data transfer is instructed by using the CDMA employing the M series code M2 on the request of the communication control sections 11A... and the code of the M series code M2 is managed.

96. 发明专利

JPH0578976B2 失效
公开(公告)号：JPH0578976B2
公开(公告)日：1993-10-29
申请号：JP19386383
申请日：1983-10-17
申请人： CANON KK
发明人： TAKAO KOJI
IPC分类号： H04L12/407 , H04L12/40

97. 发明专利

JPH04263537A LAN CONTROL SYSTEM 失效
公开(公告)号：JPH04263537A
公开(公告)日：1992-09-18
申请号：JP2441591
申请日：1991-02-19
申请人： TOSHIBA CORP
发明人： HIRASAWA YUTAKA
IPC分类号： G06F13/38 , H04L12/40 , H04L12/407
摘要： PURPOSE:To increase a processing amount by masking the transmission source address of a received frame by a communicating party address mask value, comparing a communicating party address and processing the frame for each frame of the various address at each controller. CONSTITUTION:The frame on a LAN 11 is monitored and when the frame is completed, it is fetched into a LAN controller LCP 3. The LCP 3 compares the destination address of the frame with the own address and when those addresses are not compared, the frame is abandonned. When they are coincident, the transmission source address of the frame is masked by the mask value set at communicating party address mask storage memories 6-1-6-8. Each LCP 3 compares the obtained value with the value set at communicating party address storage memories 5-1-5-8. At such a time, the values are coincident only at the memory 5-5 of the LCP 3-5, for example. Namely, only the LCP 3-5 is advanced to the next step, and the other LCP abandon the frames. The LCP 3-5 executes various frame processings and executes the announcement, etc., of the received frame to an information processor 1. Thus, loads are equally distributed to the respective LCP.

98. 发明专利

JPH04239240A POINT/MULTIPOINT TRANSMISSION SYSTEM 失效
公开(公告)号：JPH04239240A
公开(公告)日：1992-08-27
申请号：JP230991
申请日：1991-01-11
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： MANO FUMIO , OKADA KENJI
IPC分类号： H04B10/40 , H04B10/07 , H04B10/50 , H04B10/60 , H04B10/80 , H04J3/00 , H04L12/40 , H04L12/407 , H04L12/44
摘要： PURPOSE:To enable selective starting for each calling against respective slave devices regardless of the states of the other slave devices by deciding a signal area allocated for each slave device and making the calling recognize to the slave device while including a signal notifying the calling against the slave device with the calling in the signal area. CONSTITUTION:A signal is sent from a main device 100 to respective slave devices 103 to 10K, this decening signal is composed of channels #1 to #K successively allocated to a frame synchronization signal and the slave devices 103 to 10K. A calling signal AS is sent only by the channel allocated to the slave device to be called.

99. 发明专利

JPH0149221B2 失效
公开(公告)号：JPH0149221B2
公开(公告)日：1989-10-24
申请号：JP23893083
申请日：1983-12-20
申请人： KOGYO GIJUTSUIN
发明人： KOKUKYO TOMOO , IWASAKI KAZUNORI , SASAKI HIDEKI , KAJI TATSUO , FUJIWARA MUTSUMI
IPC分类号： H04L12/407

100. 发明专利

JPS635789B2 失效
公开(公告)号：JPS635789B2
公开(公告)日：1988-02-05
申请号：JP7919783
申请日：1983-05-06
申请人： DIGITAL EQUIPMENT CORP
发明人： UIRIAMU DEI SUTORETSUKAA , JON II BAJINSUKII , DEIUITSUDO SOMUPUSON
IPC分类号： G06F13/372 , G06F13/368 , G06F13/374 , G06F13/38 , G06F15/16 , G06F15/177 , H04L12/407 , H04L12/417

你已经成功收藏专利！

检索式保存成功!

IPRDB

热门服务

关于我们

友情链接

联系方式