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公开(公告)号：JP2003008571A
公开(公告)日：2003-01-10
申请号：JP2001190872
申请日：2001-06-25
Inventor： ICHIYOSHI OSAMU
Abstract: PROBLEM TO BE SOLVED: To relax concentrated accesses from subscribers, quickly provide broad area information and district associated information and various information conveniences useful such as broadcast and conferences to the subscribers. SOLUTION: An Internet information providing system is provided with: a plurality of local portals 2 connecting subscriber terminals 4 via a public line connection network 6; and a central portal 1 connected to the Internet 5 and to each local portal 2 via an inter-portal backbone communication network 11. Each local portal 2 provides area associated information to the subscriber terminals 4 and connects the subscriber terminal 4 to the Internet 5 or the central portal 1 as required. The central portal 1 provides national and global wide area information to the subscriber terminals 4 connected via the inter-portal backbone communication network 11 and connects the subscriber terminal 4 to the Internet 5 as required.
Abstract translation: 要解决的问题：为了放宽用户的集中访问，可以快速向用户提供广域信息和区域相关信息以及诸如广播和会议等各种信息便利设施。 解决方案：提供一种互联网信息提供系统：多个本地门户2，经由公共线路连接网络6连接用户终端4; 以及经由门户间骨干通信网络11连接到因特网5和每个本地门户2的中央门户1.每个本地门户2向用户终端4提供区域相关信息，并将用户终端4连接到因特网5或 中央门户1根据需要。 中央门户1向经由门户间骨干通信网络11连接的用户终端4提供国家和全球广域信息，并根据需要将用户终端4连接到因特网5。
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公开(公告)号：JP2001344359A
公开(公告)日：2001-12-14
申请号：JP2000166229
申请日：2000-06-02
Applicant: NEC CORP
Inventor： ICHIYOSHI OSAMU
IPC: G09B5/08 , G06Q50/00 , G06Q50/10 , G06Q50/20 , G09B7/02 , H04N7/173 , H04N7/20 , H04N21/4786 , G06F17/60
Abstract: PROBLEM TO BE SOLVED: To solve the conventional problem that restriction in communication capacity leads to quantitative restriction for provided programs, a high communication cost and the difficulty for dialog type education. SOLUTION: In this education system, a satellite communication school center 3 that conducts an education project and subscriber terminals 40-L, 50-L, that are used by subscribers attending a lecture are connected via a satellite communication earth station 2 and a communication satellite 1 and are also connected through a ground-based communication network 72 including the Internet, broadcasting type education is distributed to a subscriber having the subscriber terminal that receives signals from the communication satellite, and a reverse communication function that receives inquiry, response, answer, etc., from the subscriber is provided. In addition, the satellite communication school center 3 and a lecturer terminal used by a lecturer are connected via the satellite communication earth station 2 and the communication satellite and are also connected via the ground-based communication network 72, and a real-time lecture function that offers a dialogical seminar that the lecturer and the subscriber conduct simultaneously, using the broadcasting function provided by the communication satellite, the return path communication function that uses the ground-based communication network or the satellite connection, and the communication function for the lecturer is provided.
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公开(公告)号：JPH1032519A
公开(公告)日：1998-02-03
申请号：JP18593096
申请日：1996-07-16
Applicant: NEC CORP
Inventor： ICHIYOSHI OSAMU
IPC: H04B1/26 , H04B1/3822 , H04B1/40
Abstract: PROBLEM TO BE SOLVED: To miniaturize equipment at the time of sharing at a mobile object satellite communication network by allowing a receiving side to selectively transmit by the frequency of a cum or difference obtained by converting the transmission frequencies of a first IF frequency and a first local frequency corresponding to the radio frequencies of plural radio communication networks and a receiving side to convert receiving frequency to output a second IF frequency. SOLUTION: A transmission base band processing circuit 10 receives the signal of a user terminal 11, converts it into the signal form of a communication network to use by selecting from within plural communication networks and generates a transmission signal. A based band modulator 9 receives it and executes modulating operation prescribed for the communication network. An orthogonal amplitude modulation circuit 8 receives the output carrier wave of a carrier generation circuit 14. executes quadrature amplitude modulation by the output of the modulator 9 and generates an intermediate frequency signal. A mixer 7 receives it to frequency-convert into a radio frequency prescribed for the communication network. Either output of band filter 5 or 6 receiving it and synchronizing with the radio frequency band of plural communication networks is selected by a transmission RF switch 4.
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公开(公告)号：JPH1022852A
公开(公告)日：1998-01-23
申请号：JP17241996
申请日：1996-07-02
Applicant: NEC CORP
Inventor： ICHIYOSHI OSAMU
Abstract: PROBLEM TO BE SOLVED: To set a frequency channel at a very small frequency step by setting a transmission channel at the frequency step equal to a difference between a 1st step frequency and a 2nd step frequency. SOLUTION: A frequency is set not by one frequency signal-generating circuit but by the interlocking operation between a transmission carrier generating circuit 42 and a transmission radio frequency local signal generating circuit 44 of a transmission section 20. A frequency channel is set by the interlocking operation between a reception intermediate frequency local signal-generating circuit 43 and a reception radio frequency local signal-generating circuit 45 of a reception section. That is, a channel connection signal control circuit 15 conducts proper control to set a transmission channel at a frequency step between both the differences. Since the channel frequency setting at the very small frequency step is realized by the interlocking control of the local signal generating circuits 43-45 with a plurality of large step frequencies, the radio communication equipment with a small phase noise and high-frequency switching speed is configured.
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公开(公告)号：JPH07307970A
公开(公告)日：1995-11-21
申请号：JP9984394
申请日：1994-05-13
Applicant: NEC CORP
Inventor： ICHIYOSHI OSAMU
Abstract: PURPOSE:To attain efficient use of the radio channels by assigning the same radio channel in common among plural radio terminal stations and also to perform the group talking in real time in the communication that is carried out among those radio terminal stations which are included in the same cell. CONSTITUTION:A base station 12 placed in an area (cell) includes K pieces of channel devices CHU which set the communication channels among radio terminal stations 11, 11' and 11'' by a reproduction repeating system, a branch switch BSW 20 which has N pieces of input/output terminals (N>K) that are placed between the demodulation parts 19-1 to 19-K and the modulation parts 21-1 to 21-K of the devices CHU, and a circuit connection controller CCC 27 which performs the circuit connection control by controlling the connection of the BSW 20 after performing the transmission/reception of the control signals to the stations 11, 11' and 11'' through the CHU. Then the communication is attained with other areas by means of L pieces of input/output terminals (L=N-K) of the BSW 20.
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Patent Agency Ranking
公开(公告)号：JPH07274254A
公开(公告)日：1995-10-20
申请号：JP8374294
申请日：1994-03-31
Applicant: NEC CORP
Inventor： NISHIYAMA TAKEHIRO , ICHIYOSHI OSAMU
Abstract: PURPOSE:To obtain a radio conference system by decreasing a frequency band of radio frequencies used between a master station and plural slave stations so as to utilize effectively the radio frequencies and simplifying the installation of the master station. CONSTITUTION:A master station 100 and plural slave stations 200-400 are configured to send/receive signals with the same radio frequency f1, the master station 100 receives signals from the slave stations 200-400 and sends the received signal to each slave station. Furthermore, when a transmission signal comes form the master station 100, the master station blocks the transmission of the signal from the slave stations 200-400. When a bypass signal is in existence in a reception signal of the master station 100, a cancellation means cancels the signal to receive clearly the signals from the slave stations 200-400. The master station 100 and the slave stations 200-400 make two-way communication by using the same frequency f1 respectively and then the radio frequency band is utilized effectively and even when the number of slave stations is increased, one reception section of the master station 100 is enough and the master station is configured to be small size with low power consumption.
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公开(公告)号：JPH0795649A
公开(公告)日：1995-04-07
申请号：JP23752993
申请日：1993-09-24
Applicant: NEC CORP
Inventor： ICHIYOSHI OSAMU
Abstract: PURPOSE:To realize the radio communication system by which a communication network is simply introduced to an area where no communication means is available. CONSTITUTION:In the system in which a base station(BS) 21 is located to a center of an area, a terminal station(TS) 40 is located to an area where communication terminal equipments are required, communication channels comprising plural radio channels are set between the BS 21 and the TS 40 and optional terminal stations(TS) are connected through exchange connection processing by the BS 21, a predetermined number of adjacent radio channels is used for a channel group(CG). The BS 21 has a channel group unit(CGU) 22, a base band exchange circuit (BSW) 23 and an exchange connection control circuit (CONT) 24. The CGU 22 has plural group modems (G-modem) applying simultaneous modulation demodulation to signals of the CG through digital signal processing. The base band exchange circuit (BSW) 23 in the BS 21 connects to a base band section of the G-modem to make channel connection for each channel and the CONT 24 controls the BSW 23 through exchange connection to connect channels according to the incidence of a call.
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公开(公告)号：JPH0697854A
公开(公告)日：1994-04-08
申请号：JP24226392
申请日：1992-09-10
Applicant: NEC CORP
Inventor： ICHIYOSHI OSAMU
Abstract: PURPOSE:To miniaturize a branching device and to miniaturize an equipment by providing an interference wave cancelling circuit to degrade the precision of the branching device. CONSTITUTION:Leakage of thermal noise from a transmission side to a reception side is allowed in a certain degree to miniaturize a branching device 2. Consequently, thermal noise on the transmission side is mixed and amplified by a low-noise amplifier 3 and is inputted to a mixer 6. Simultaneously, a transmission signal and thermal noise are branched from a directional coupler 4 and are inputted to a mixer 5. A local signal is supplied from a synthesizer 7 to mixers 5 and 6, and outputs of these mixers pass filters 8 and 9 having the same frequency selection characteristic, and the filter 8 selectively outputs only transmission thermal noise, and the filter 9 outputs a reception signal and thermal noise. They are mixed with a desired reception wave extracted by cancelling the thermal noise in the interference wave cancelling circuit consisting of a first multiplying circuit 13, a DC amplifier 14, and a second multiplying circuit 15, then, taking out only the desired reception wave.
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公开(公告)号：JPH0613931A
公开(公告)日：1994-01-21
申请号：JP16977592
申请日：1992-06-29
Applicant: NEC CORP
Inventor： ICHIYOSHI OSAMU
Abstract: PURPOSE:To reduce loss in an RF section without the use of a filter by the duplex communication system by providing a voice detector so as to control an RF switch automatically. CONSTITUTION:The system is provided with a voice detector (V.DET) 9 detecting a coded signal from a voice coder 7, and when a speech head of a voice signal is detected by a control signal of the V.DET 9, a switch of an RF switch 2 is switched to the position of a transmission section, and the switch of the RF switch 2 is switched to the position of a reception section at the detection of no voice signal. That is, the V.DET 9 inputs a voice detection signal to switch the RF switch 2 to the position of an HPA 3 by using a relevant control signal. Since the V.DET 9 inputs no voice detection signal for a non-voice period, the control signal is stopped, the RF switch 2 is turned to the position of an LNA 14 side and the state is restored to a reception signal wait state. Thus, the instantaneous operation of the device is in accordance with the simplex communication system, while the operating mode of the talker adopts the duplex communication system.
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公开(公告)号：JPH05122068A
公开(公告)日：1993-05-18
申请号：JP30655391
申请日：1991-10-26
Applicant: NEC CORP
Inventor： ICHIYOSHI OSAMU
Abstract: PURPOSE:To obtain the frequency signals of fine frequency steps over a wide frequency range and also to obtain a frequency synthesizer where phase noise is suppressed. CONSTITUTION:The frequency synthesizer is constituted of a reference oscillator 1, DDS(direct digital synthesizer) 2 generating the frequency signal which is designated by a channel number, a frequency-divider 3 frequency-dividing the output of the reference oscillator 1, a partial frequency synthesizer 4 variably multiplying the output of the frequency-divider 3, VCO(voltage control oscillator) 8, a frequency-divider 9 frequency-dividing the output of VCO, a mixer 5 obtaining frequency difference between the output of the frequency-divider 9 and the output of the partial frequency synthesizer 4, LPF 10, a phase comparator 6 phasecomparing the output of the LPF 10 with the output of DDS 2 and a loop filter 7 smoothing the output.
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