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1. 发明专利

JPH0311702B2 失效
公开(公告)号：JPH0311702B2
公开(公告)日：1991-02-18
申请号：JP2136084
申请日：1984-02-08
申请人： JAPAN RADIO CO LTD
发明人： WAKABAYASHI KENJI , SEKIGUCHI MIKIO , MINEGISHI MINORU
IPC分类号： H04M3/22 , H04M3/12

2. 发明专利

JPS60165857A AUTOMATIC SWITCHING METHOD OF DUPLICATED SYSTEM DEVICE 失效
公开(公告)号：JPS60165857A
公开(公告)日：1985-08-29
申请号：JP2136084
申请日：1984-02-08
申请人： JAPAN RADIO CO LTD
发明人： WAKABAYASHI KENJI , SEKIGUCHI MIKIO , MINEGISHI MINORU
IPC分类号： H04M3/22 , H04M3/12
摘要： PURPOSE:To switch automatically an electric circuit of a normal system and a spare system mutually by making an output logic of fault information coincident with an input logic of a man-made fault taken place when a printed circuit board of the electric circuit in operation is plugged out in error at check and adjustment. CONSTITUTION:If a man-made fault that a printed circuit board AN mounting a circuit A is plugged out in mistake at check and adjustment takes place while circuits A, B, C of the active system N are in operation, since a fault information output circuit MA is plugged out together with the circuit A, a terminal 12 is disconnected from a line la. That is, since the same state as an open line la is caused, a potential at a terminal 14 reaches +5V. Thus, a detection section DA of the fault information reception DN is impressed with +5V in place of a ground potential the same that a fault takes place in the circuit A. The operation of the detection section DA and the switch operation from the active system N of the decision section DL into the spare system E are similar the case that the circuit A is failed.

3. 发明专利

JPH08274716A SHORT-DISTANCE OPTICAL COMMUNICATION SYSTEM 失效
公开(公告)号：JPH08274716A
公开(公告)日：1996-10-18
申请号：JP7532095
申请日：1995-03-31
申请人： JAPAN RADIO CO LTD
发明人： ODA TAKASHI , OI MASAMITSU , WAKABAYASHI KENJI , OGAWA YOSHIYUKI
IPC分类号： H04N1/00 , H04B10/11 , H04B10/114 , H04B10/54 , H04B10/556 , H04B10/85 , H04J3/00 , H04J14/08 , H04L12/28 , H04N1/32 , H04B10/105 , H04B10/00 , H04B10/10 , H04B10/22
摘要： PURPOSE: To provide a short-distance optical communication system which is immune to an electromagnetic noise, etc., and hardly exposed to interference or wiretapping. CONSTITUTION: An optical transmission equipment mounted on a vehicle 10 and optical repeaters 3 and 4 are connected by radio by utilizing optical space transmission. The optical repeaters 3 and 4 and an optical terminal station 6 are connected through a paired cable 5 constituting a looped transmission line. Various equipments mounted on the vehicle 10 are connected to the optical terminal station 6 and can further be connected to a PBX7, a private section LAN 8, a command console 9, etc. The optical space transmission is used, so the influence of an electromagnetic noise, etc., is hardly exerted.

4. 发明专利

JPS59135993A System for setting quality of call of time division private branch of exchange 失效
标题翻译：用于设置交换时间段私人分支机构的质量的系统
公开(公告)号：JPS59135993A
公开(公告)日：1984-08-04
申请号：JP1086883
申请日：1983-01-26
申请人： Japan Radio Co Ltd
发明人： KAMATA KOUZOU , OSHITANI MASATOSHI , WAKABAYASHI KENJI
IPC分类号： H04Q3/58 , H04Q11/04
CPC分类号： H04Q11/04
摘要： PURPOSE:To improve the volume equivalent of a subscriber system by providing a transmission or receiving amplifier having a gain corresponding to attenuationof virtual line to a 4-wire transmission side or a receiving side a trunk line. CONSTITUTION:The increase in the transmission gain in matching with the attenuation lb of a virtual line BON171 inserted to the trunk line 5 of a trunk line 73 side is performed by a transmission amplifier 75 in the trunk line 73. The improving effect of the balance return loss due to the insertion of the virtual line BON171 is unchanged but since the reverse flow amount to the receiving system is increased by lb, the improving effect is subtracted to attain lb dB in total and then the output level of the time division private branch of exchange is made constant. Further, when the balance return loss is sufficient and no improvement is required, a receiving amplifier 76 having a gain corresponding to the attenuation of the vitual line BON1 is provided at the 4-wire receiving side of the trunk to contribute the improvement of the receiving call quality.
摘要翻译：目的：通过提供具有对应于虚拟线路的衰减的增益的发送或接收放大器来提高订户系统的音量等同于4线发送侧或接收侧中继线。构成：与中继线73侧的中继线5插入的虚拟线BON171的衰减量lb匹配的传输增益的增加由中继线73的发送放大器75进行。余额的改善效果由于虚线BON171的插入而导致的返回损失不变，但是由于接收系统的反向流量增加了lb，因此减少了改进效果以达到总共lbbb，然后时分专用分支的输出电平的交换是恒定的。此外，当平衡回波损耗足够并且不需要改进时，具有与虚线BON1的衰减相对应的增益的接收放大器76设置在主干的4线接收侧，以有助于改善接收通话质量。

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