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1. 发明专利

JPH02298127A SATELLITE COMMUNICATION SYSTEM 失效
公开(公告)号：JPH02298127A
公开(公告)日：1990-12-10
申请号：JP2038490
申请日：1990-02-01
申请人： NEC CORP
发明人： HOTSUTA TOSHITSUNE , GOTO YUJI
IPC分类号： H04B7/155 , H04B7/212
摘要： PURPOSE:To obtain a simple and economical request assignment access satellite communication system operated without a common signal transmission line and a control station among plural (3 or more) earth stations by outputting an alarm representing data collision to a terminal equipment in a transmitter-receiver of each earth station. CONSTITUTION:The transmitter-receiver 1 of each earth station applies transmission start and stop with an access request signal inputted from a terminal equipment in the satellite communication system of the request assignment system using one frequency in common with an access request signal from the terminal equipment via a communication satellite by plural earth stations. Then a station number set by each station is added to a sent signal and a station number included in the received signal sent from its own station and reflected from the communication satellite is detected. Moreover, after the transmission is started with an access request signal from the terminal equipment, while the preset protection time is elapsed, whether or not the station number of its own station is detected normally from the received signal is decided and when the station number of its own station is not normally detected from the received signal, while the access request signal is inputted from the terminal equipment, an alarm representing the fault of the transmission line is sent to the terminal equipment.

2. 发明专利

JPH02134936A MONITORING CIRCUIT FOR COMMUNICATION EQUIPMENT 失效
公开(公告)号：JPH02134936A
公开(公告)日：1990-05-23
申请号：JP28853988
申请日：1988-11-15
申请人： NEC CORP
发明人： YOSHIZAWA YASUNORI , HOTSUTA TOSHITSUNE
IPC分类号： H04B17/00 , H04B7/15
摘要： PURPOSE:To easily restore the operation history of a communication equipment at the time of maintenance for the occurrence of a fault or the like by preserving the state change of the communication equipment in an exchangeable non- volatile memory. CONSTITUTION:A monitoring circuit 13 monitors and stores the operation state and the fault state of a communication equipment 11 and consists of a state monitoring circuit 130, a control circuit 131, a state memory 132, a time counter 133, and a monitoring circuit power source 134. The state monitoring circuit 130 collects the on/off state of the power source of the communication equipment 11 and the operation state and the fault state of each element constituting the communication equipment 11 under the control of the control circuit 131 and outputs them to the control circuit 131. When the fault state of the communication equipment is changed, the operation state and the fault state at this time and the time are written in a non-volatile storage means 132. This means 132 can be replaced. Thus, the non-volatile storage means is periodically replaced with another and the old non-volatile storage means is recovered to recognize the state of each communication equipment.

3. 发明专利

JPH01106639A TRANSMITTER-RECEIVER FOR SATELLITE COMMUNICATION EARTH STATION 失效
公开(公告)号：JPH01106639A
公开(公告)日：1989-04-24
申请号：JP26564587
申请日：1987-10-20
申请人： NEC CORP
发明人： HOTSUTA TOSHITSUNE
IPC分类号： H04B7/005 , H04B7/15 , H04B7/208
摘要： PURPOSE:To attain inexpensive constitution by adding a channel identification code to a transmission signal and sending the result and using the channel identification code added to a received signal so as to control the received center frequency. CONSTITUTION:A transmission signal channel identification code is outputted while being added to the transmission signal. A reception frequency setting circuit 71 of a reception section generates a channel number C2 and a channel identification code CC2 corresponding to the channel number C2 of a demodulator 8. On the other hand, a down-converter 75 frequency-converts a received intermediate frequency signal inputted from a receiver 5 and gives an output. A demodulation circuit 76 demodulates an input signal. A separation circuit 79 outputs separately the channel identification code CC3 from the output of the circuit 76. A comparator circuit 72 outputs difference information of the codes CC2 and CC3. A reception channel control circuit 3 uses an output of the circuit 72 to correct and output the number C2. As a result, the local oscillation frequency outputted from a frequency synthesizer 74 is changed in a direction to compensate the deviation of the received frequency.

4. 发明专利

JPS6381515A AUTOMATIC POWER CONTROL CIRCUIT 失效
公开(公告)号：JPS6381515A
公开(公告)日：1988-04-12
申请号：JP22704786
申请日：1986-09-25
申请人： NEC CORP
发明人： HOTSUTA TOSHITSUNE , YAMAMOTO OSAMU
IPC分类号： G05F1/66 , H03G3/20
摘要： PURPOSE:To make the level control of an output power highly accurate by comparing an output power control signal with an output of a power amplifier and integrating the error in case a signal input is present, increasing the attenuation of a variable attenuator when the output of the power amplifier is larger, and fixing the attenuation of the variable attenuator to a value just before the signal input loss in case the signal input is absent. CONSTITUTION:When a signal is fed to an input terminal 1, an output power control signal (c) and an output of a power amplifier 3 are compared, the error is integrated, and when the output of the power amplifier 3 is larger, the attenuation of the variable attenuator 2 is increased, and when the output of the power amplifier 3 is smaller, the attenuation of the variable attenuator 2 is made smaller. Above-mentioned function is made through the control of a negative feedback loop. Thus, the output power fluctuation is eliminated and even in the absence of the signal to the input terminal 1, the attenuation of the variable attenuator 2 is fixed to the preceding value to amplify a burst signal stably.

5. 发明专利

JPS62147822A TIME DIVISION MULTIPLE ACCESS COMMUNICATION EQUIPMENT 失效
公开(公告)号：JPS62147822A
公开(公告)日：1987-07-01
申请号：JP28983085
申请日：1985-12-23
申请人： NEC CORP
发明人： HOTSUTA TOSHITSUNE
IPC分类号： H04J3/00 , H04B7/15 , H04B7/212
摘要： PURPOSE:To reduce the probability of the occurrence of collision of bursts sent from each earth station by designing the titled equipment that no burst is sent when a synchronizing signal for a common burst is detected and providing a protection time until the synchronizing signal is detected. CONSTITUTION:When the level of a burst transmission request signal 8 changes from 0 to 1, the level of a synchronizing signal detection signal 15 represents the level 1 indicating the detection of a synchronizing signal, the level of a transmission gate signal 17 of the timing corresponding to the burst is brought into 0 and no burst is sent. When the level of the signal 15 is logical 0, which represents undetection of the synchronizing signal, the level of a transmission gate signal 17 is brought into logical 1 to send the burst and then the burst is sent. As to the burst where a TXONB signal 10 is logical 1 and the start of burst transmission, after a predetermined protection time, e.g., nearly 0.3sec elapses, when the level of the synchronizing signal detection signal 15 is 0, the level of the transmission gate signal 17 corresponding to the burst is brought into 0 to stop the transmission of the said burst.

6. 发明专利

JPS59161145A Stuff controlling system 失效
标题翻译： STUFF控制系统
公开(公告)号：JPS59161145A
公开(公告)日：1984-09-11
申请号：JP3553483
申请日：1983-03-04
申请人： Nec Corp , Nippon Telegr & Teleph Corp
发明人： TANIGUCHI TAICHI , HOTSUTA TOSHITSUNE , HAYASHIZAKI HIROKI , MOROTOMI HITOSHI
IPC分类号： H04B7/15 , H04B7/212 , H04J3/07
CPC分类号： H04J3/07
摘要： PURPOSE:To improve a utilizing efficiency of a satellite communication without deteriorating a stuff detecting error rate by using the time slot for a stuff disignation code to a trasmission of an information code, in a satellite communication system for executing a time division multiplex communication. CONSTITUTION:When a stuff existence signal is inputted from a stuff request generating circuit 2, a stuff existence pattern A and a dummy code are inserted into a stuff designating code use time slot S and a variable code use time slot V, respectively. Between the following (n) frames, an information code C from an input terminal 104, and an output signal from a transmitting elastic buffer circuit 1 are inserted into the slot S and the slot V, respectively. After passing through said (n) frames, a stuff non-existence pattern B and an output signal from the circuit 1 are inserted into the slot S and the slot V, respectively. Also, the output signal from the circuit 1 is always inserted into a slot I, and a selecting circuit 3 executes such an operation and outputs the output signal from a terminal 105.
摘要翻译：目的：在用于执行时分多路复用通信的卫星通信系统中，为了提高卫星通信的利用效率，而不会通过使用用于消息的信息码的消息码的时隙来降低信息检测错误率。构成：当从填充请求生成电路2输入填充存在信号时，将填充存在模式A和伪代码分别插入到指定代码使用时隙S和可变代码使用时隙V中。在以下（n）帧之间，来自输入端子104的信息码C和来自发送弹性缓冲电路1的输出信号分别插入到槽S和槽V中。在通过所述（n）帧之后，将填充不存在模式B和来自电路1的输出信号分别插入到槽S和槽V中。此外，来自电路1的输出信号总是插入到时隙I中，并且选择电路3执行这样的操作，并从终端105输出输出信号。

7. 发明专利

JPH01221949A SCRAMBLING-DE-SCRAMBLING SYSTEM 失效
公开(公告)号：JPH01221949A
公开(公告)日：1989-09-05
申请号：JP4790288
申请日：1988-03-01
申请人： NEC CORP
发明人： OI TOMOYUKI , HOTSUTA TOSHITSUNE , ISOE YASUHITO
IPC分类号： H04J3/06 , H04L7/00 , H04L25/03
摘要： PURPOSE:To perform de-scrambling in unit of sub multiframe even in mid-way of a multiframe by detecting multiframe sequence information in a received sub multiframe after establishing frame synchronization. CONSTITUTION:As for reception data after demodulation, a detection circuit 2 recognizes a synchronous word or the inversion of the synchronous word as the forefront of a frame, and establishes reception frame synchronization, and also, detects the forefront of the sub multiframe. The content of an information part where the present sub multiframe number information is inputted is read from data in which the reception frame synchronization is established, and the present sub multiframe number is recognized 3. In such a way, the initial value of a de-scrambling pattern at the forefront of the sub multiframe is selected out of the initial values of the de-scrambling pattern at the forefront of each stored sub multiframe by using the multiframe sequence information, and a desired de-scrambling pattern is generated 4, and a pattern corresponding to a transmission side which becomes a fixed pattern is generated at a multiframe cycle at the time of recognizing the forefront of the multiframe.

8. 发明专利

JPH01170126A SATELLITE COMMUNICATION EARTH STATION SUPERVISORY SYSTEM 失效
公开(公告)号：JPH01170126A
公开(公告)日：1989-07-05
申请号：JP32804887
申请日：1987-12-24
申请人： NEC CORP
发明人： YOSHIZAWA YASUNORI , HOTSUTA TOSHITSUNE
IPC分类号： H04M3/22 , H04B7/15
摘要： PURPOSE:To prevent the loss of trouble information by providing a storing means to each small-sized satellite communication earth station, storing the trouble information, stopping a call when a called supervisory station data transferring means is busy, and re-calling it after a prescribed time. CONSTITUTION:A satellite communication earth station supervisory system is composed by connecting a supervisory station 30 and plural small-sized satellite communication earth stations 10 and 20 through a public communication network 40. The supervisory station 30 is equipped with a data transferring circuit 131, a data transferring circuit 132 as the supervisory station data transferring means and a central supervisory control device 133. When the transferring circuit 132 of the data of the supervisory station 30 is busy, the busy sound is detected, the earth station opens the public communication network once since the call fails, and simultaneously, the station waits until the prescribed time passes. Thereafter, a calling action is executed again. As a result, the earth station can transmit the contents of a condition memory to the supervisory station 30, and the collecting action of supervisory information and the action of a completion processing are executed by the supervisory station 30.

9. 发明专利

JPS592441A Frequency divider 失效
标题翻译：频率分配器
公开(公告)号：JPS592441A
公开(公告)日：1984-01-09
申请号：JP10976082
申请日：1982-06-28
申请人： Nec Corp
发明人： HOTSUTA TOSHITSUNE
IPC分类号： H03K23/66
CPC分类号： H03K23/665
摘要： PURPOSE:To eliminate the need for the addition of a counter, even if the frame is long, by opening a gate with a final frequency dividing value, when a desired period is larger than the maximum frequency dividing value, in a frequency divider used for the production of a frame pulse. CONSTITUTION:An operating circuit 26 stores a variable M in its inside and the initial value of the variable M is taken as the final frequency dividing ratio N. The operating circuit 26 references the variable M in synchronizing with the count end pulse outputted from the counter 21, feeds the next calculating value, subtracts the preset value given from the variable M to counters 21-23 so that the period N in total is counted at the counters 21-23. When the variable M is M>2L, the counters 21-23 feed a preset value being the period L, and when M
摘要翻译：目的：为了消除增加计数器的需要，即使帧长，通过打开具有最终分频值的门，当期望的周期大于最大分频值时，在用于生成帧脉冲。构成：操作电路26将变量M存储在其内部，将变量M的初始值作为最终分频比N.操作电路26与从计数器输出的计数结束脉冲同步地参考变量M 如图21所示，馈送下一个计算值，将从变量M给出的预设值减去计数器21-23，使得在计数器21-23处对总计的周期N进行计数。当变量M为M> 2L时，计数器21-23输入周期为L的预设值，当M <= 2L时，计数器21-23输入预设值为周期M.分频器被控制为计数器的计数结束脉冲在周期N内仅外部输出一次。

10. 发明专利

JPH01136433A SUPERVISION SYSTEM FOR SATELLITE COMMUNICATION EARTH STATION 失效
公开(公告)号：JPH01136433A
公开(公告)日：1989-05-29
申请号：JP29549787
申请日：1987-11-24
申请人： NEC CORP
发明人： HOTSUTA TOSHITSUNE
IPC分类号： H04M3/22 , H04B7/15
摘要： PURPOSE:To manage the result of supervising centralizingly for each small sized satellite communication earth station from a supervision station by sending the result of supervising to a supervision station via a public communication network. CONSTITUTION:A subscriber line of a public communication network 40 is drawn to a supervision station 30 and small sized satellite communication earth stations 10, 20 and the supervision station 30 manages the small sized satellite communication earth stations 10, 20 in the lamp according to the similar communication from to the conventional telephone communication and facsimile communication. For example, when a state supervising circuit 121 of a small sized satellite communication earth station 10, for example, detects the change in the reception synchronization of the communication equipment 111 from the synchronization state into out of synchronization state, the state supervising circuit 121 sends a dial number of a data transmission circuit 132 to a public communication network 40. Thus, the supervision station 30 sends a command representing the permission of monitor result information transmission to the public communication network 40. The state monitor circuit 121 receiving the command issues its own station terminal address to the monitor result information and reports the result to a central supervision controller 133.

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