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1. 发明专利

JPH10149086A ANSWERING SYSTEM 失效
公开(公告)号：JPH10149086A
公开(公告)日：1998-06-02
申请号：JP30772496
申请日：1996-11-19
申请人： NIPPON TELEGRAPH & TELEPHONE , UNIV TOKAI
发明人： NAGAI YASUHIRO , SUZUKI TAKAFUMI , KON TAICHI , SHINSHI MASAAKI , KIMURA HIDETOSHI , YAMAMOTO KOICHI
IPC分类号： G09B5/06 , G06F13/00 , G06F15/00 , H04B7/00
摘要： PROBLEM TO BE SOLVED: To understand level of an user using an answering terminal in real time, by communicating questions from a questioner (a teacher) with answers from the user using the answering terminal (a respondent or a student) using a one-to-one bidirectional wireless communication system. SOLUTION: When a questioner inputs data by using a keyboard or others, its signal is transmitted from a computer 400 to an answering/receiving terminal 300, and then RF(Radio Frequency) commands are transmitted from the answering/receiving terminal 300 to a distributing repeater 200. The distributing repeater 200 receives the radio-frequency commands and then transmits IR (Infrared Ray) data demanding commands added by terminal ID data to all of answering terminals 100. A user who uses the terminal overlays on the RF own data such as terminal ID, terminal user's ID, or answers from the answering terminal 100 and transmits them back to the answering/receiving terminal 300.

2. 发明专利

JPH01259634A RADIO RECEIVER 失效
公开(公告)号：JPH01259634A
公开(公告)日：1989-10-17
申请号：JP8698288
申请日：1988-04-08
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： OKA JUNICHI , SHINSHI MASAAKI , AZUMA AKIHIRO
IPC分类号： H04B7/26
摘要： PURPOSE:To automatically switch a receiving frequency and to eliminate trouble caused by switching to a service area having a different frequency by detecting an electric field strength at the frequency of the peripheral service area, comparing it with an electric field strength at the receiving frequency being held and judging whether the radio receiver transfers between the service areas. CONSTITUTION:A control means changes the frequency to the frequency of the peripheral service area of the service area where the receiver exists in the receiving cessation period of intermittent receiving. The detection electric field strength at the changed frequency is obtained and an electric field strength comparing means compares it with the electric field strength by the receiving frequency in a receiving period being held by an electric strength storage means. When the detection electric field strength changes, it is judged that a transfer is made between the service areas and the receiving frequency is automatically switched. Thus, the transfer of the radio receiver between the service areas is detected, the receiving frequency is automatically changed in accordance with that and therefore, it becomes unnecessary to manually switch the frequency each time.

3. 发明专利

JPH01185034A MOBILE RADIOCOMMUNICATION SYSTEM 失效
公开(公告)号：JPH01185034A
公开(公告)日：1989-07-24
申请号：JP1031588
申请日：1988-01-19
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： OGOSE SHIGEAKI , HATTORI TAKESHI , SHINSHI MASAAKI
IPC分类号： H04W84/02 , H04B7/26
摘要： PURPOSE:To evade the useless repeated transmission of a calling wave by reporting that a call is executed to a mobile station such as an automobile to keep on traveling while a user is not conscious that a power source remains in an off-condition or that an antenna remains folded. CONSTITUTION:A paging transmitter 17 is activated by the control of a control part 13 after a prescribed time, and a calling signal to a paging receiver 20 is transmitted to a channel exclusive-use for paging. In the storage circuit of the control part 13, a number table to cause the number of the mobile station and the number of the paging receiver attached to the mobile station to correspond is stored, the number of paging receiver arranged in the mobile station is retrieved to the number of the mobile station to execute a call connection by a control channel, and the call by the channel exclusive-use for paging is executed to the number. Thus, the user of the mobile station is made conscious that the power source of a mobile communicating device is off, and the power source can be operated to be turned on.

4. 发明专利

JPS55107365A DIGITAL SIGNAL RECEPTION SYSTEM 失效
公开(公告)号：JPS55107365A
公开(公告)日：1980-08-18
申请号：JP1436079
申请日：1979-02-13
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： HORIKAWA IZUMI , SHINSHI MASAAKI
IPC分类号： H04L27/14 , H04B1/10 , H04B1/76 , H04L25/06 , H04L25/08 , H04L25/24 , H04L25/38 , H04L27/00
摘要： PURPOSE:To realize the digital transmission of high quality easily, by eliminating the noise spectrum included in the band of digital signal and reproducing and adding only the signal component rejected from the output identified and reproduced. CONSTITUTION:After rejecting the narrow band noise fed in the digital signal band through the use of the narrow band noise rejection filter 2 with digital signal component, signal is reproduced with identification, reproduction or modulation, the signal component only lost is reproduced through the narrow signal pick up filter 8, and it is fed back to the addition circuit 3. Accordingly, since the signal waveform compensated so that no wave distortion component is present can be reproduced, the deterioration of digital signal transmission system is hardly caused to reject noise in the band.

5. 发明专利

JPH02223255A TRANSMISSION EQUIPMENT 失效
公开(公告)号：JPH02223255A
公开(公告)日：1990-09-05
申请号：JP4453189
申请日：1989-02-23
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： TOMISATO SHIGERU , MUROTA KAZUAKI , SHINSHI MASAAKI
IPC分类号： H04L27/00 , H04B1/04
摘要： PURPOSE:To transmit a signal having envelope fluctuation after amplifying with superior power efficiency without deteriorating spectrum outside the band area by generating two systems of frequency-modulated waves based on an inputted modulation signal, then, synthesizing them. CONSTITUTION:A signal wave including the signal wave having the envelope fluctuation is separated to the two systems of frequencymodulated waves, and a phase error generated by the difference of initial phases of frequency modulation means 22 and 23 is synthesized at a hybrid circuit 25 after correcting at correction circuits 26-29. Thereby, it is possible to comprise transmission equipment with transmission capability of superior power efficiency without increasing a circuit scale as keeping the spectrum outside the band area of the signal wave including the signal wave having the envelope fluctuation.

6. 发明专利

JPH0244929A MOBILE BODY POSITION DETECTION METHOD 失效
公开(公告)号：JPH0244929A
公开(公告)日：1990-02-14
申请号：JP19580088
申请日：1988-08-05
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： SUZUKI TOSHIO , HIRAIDE KENKICHI , SHINSHI MASAAKI , HATTORI TAKESHI
IPC分类号： H04W4/16 , G01S5/02 , G01S5/14 , H04W4/02 , H04W48/20 , H04W60/00 , H04W64/00
摘要： PURPOSE:To detect the position of a mobile body with high accuracy more than in the unit of radio zone without requiring large installation investment by collating a reception electric field level in a mobile station of a base station transmission wave with the level in an electric field strength map so as to detect the position of the mobile station in existence in an area. CONSTITUTION:A mobile station 10 identifies and detects the reception electric field level of a base station transmission wave of a mobile body communication system for each of base stations 21-23, and the mobile station or a communication party to the mobile station 10 collates the level of an electric field strength map 90 whose position is made correspondent with the reception electric field level with the received electric field level to be detected for each of the base stations 21-23. Thus, the position of the mobile station 10 is detected more accurately than that in the radio unit zone of the mobile body communication system and the equipment required for the detention is simplified.

7. 发明专利

JPS5851442B2 JPS5851442B2 - 失效
公开(公告)号：JPS5851442B2
公开(公告)日：1983-11-16
申请号：JP10186872
申请日：1972-10-13
申请人： Nippon Telegraph & Telephone
发明人： SHINSHI MASAAKI , HASHIGUCHI YUKIO , TAKANO TADASHI
IPC分类号： H01Q15/16 , H01Q19/10

8. 发明专利

JPS5821466B2 失效
公开(公告)号：JPS5821466B2
公开(公告)日：1983-04-30
申请号：JP1436079
申请日：1979-02-13
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： HORIKAWA IZUMI , SHINSHI MASAAKI
IPC分类号： H04L27/14 , H04B1/10 , H04B1/76 , H04L25/06 , H04L25/08 , H04L25/24 , H04L25/38 , H04L27/00

9. 发明专利

JPS53105343A ANTENNA UNIT 失效
公开(公告)号：JPS53105343A
公开(公告)日：1978-09-13
申请号：JP1980877
申请日：1977-02-26
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： OGAWA HIDEKAZU , HORI TOSHIKAZU , TAKANO TADASHI , SHINSHI MASAAKI
IPC分类号： H01Q19/10 , H01Q19/02 , H01Q19/12
摘要： PURPOSE:To improve the characteristics of radiation in broad angle by weakening the scattered waves from supporting stems, through the location of the dielectric substance or metallic construction on the surface of the subreflection support stem present in the antenna opening surface.

10. 发明专利

JPS5353239A VARIABLE POWER ALLOTTER 失效
公开(公告)号：JPS5353239A
公开(公告)日：1978-05-15
申请号：JP12785076
申请日：1976-10-26
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： KUMAZAWA HIROYUKI , SHINSHI MASAAKI , UENO KENJI
IPC分类号： H01P5/04 , H01P5/12
摘要： PURPOSE:To obtain a waveguide-type variable power allotter which is mainly from the microwave band to milli-wave band with a small size and light weight and which features a minimized temperature change as well as a reduced insertion loss, by deciding the short circuiting position dispersively for the short circuit plate.

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