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1. 发明专利

JPH04196625A RADIO SIGNAL CHANGEOVER DEVICE 失效
公开(公告)号：JPH04196625A
公开(公告)日：1992-07-16
申请号：JP32159990
申请日：1990-11-26
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： TAKANASHI HITOSHI , KOMAKI SHOZO
IPC分类号： H04B7/204 , H04B10/29 , H04B10/291
摘要： PURPOSE:To eliminate the need for a MODEM and to facilitate the maintenance by converting a high frequency signal into an optical signal by an electrooptic converter, selecting the signal and restoring the signal into an electric signal after changeover. CONSTITUTION:A signal received by antennas 1,101 is distributed respectively by distributers 3,103 and the distributed signal is subject to electrooptic conversion by electrooptic converters 37,137 via band pass filters 4,104 whose pass band frequencies differ one by one wave each. An optical signal is connected to optoelectric converters 41,141 corresponding to a required channel by an optical switch 40 and the high frequency signal subject to optoelectric conversion is converted into a required frequency by frequency converters 44,144. Thus, the signal changeover, the high frequency signal changeover or broad band signal changeover are attained with a simple device and the device is made small and the maintenance is facilitated.

2. 发明专利

JPH04196623A FEEDER 失效
公开(公告)号：JPH04196623A
公开(公告)日：1992-07-16
申请号：JP32159790
申请日：1990-11-26
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： TAKANASHI HITOSHI , KOMAKI SHOZO
IPC分类号： H04B10/00 , H04B1/04 , H04B1/18 , H04B7/08 , H04B10/80
摘要： PURPOSE:To simplify the installation work of a feeding system, to improve the maintenability and to reduce the feeding loss by providing an electrooptic converter, an optoelectric converter to the feeder and using an optical fiber so as to feed with a signal converted into an optical signal. CONSTITUTION:A signal received by an antenna 1 is converted into an optical signal by an electrooptic converter 6 and inputted to an optical fiber 7. The optical signal fed through the optical fiber 7 is converted into an electric signal by an optoelectric converter 8 and inputted to a receiver 3. Thus, the high frequency signal is converted as it is into an optical signal and fed and subject to optoelectric conversion near the receiver 3 and supplied. Thus, since the feeder made of the optical fiber 7 is light and wired freely, the feeder wiring work is simplified, the maintenance performance is improved and the attenuation is reduced by using the optical fiber.

3. 发明专利

JPH04157820A RADIO COMMUNICATION DEVICE 失效
公开(公告)号：JPH04157820A
公开(公告)日：1992-05-29
申请号：JP28243790
申请日：1990-10-20
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： TAKANASHI HITOSHI , KOMAKI SHOZO
IPC分类号： H04B10/00 , H04J13/00 , H04J14/00 , H04Q7/36
摘要： PURPOSE:To set a call by performing spectrum diffusion and spectrum reverse diffusion using corresponding diffusion codes and to perform signal transmission in the form of a high frequency signal in a radio frequency band by making connections by an optical fiber. CONSTITUTION:When diffusion codes p1-pn are set in spectrum reverse diffusion devices 43 of respective slave stations 401-40n, a diffusion code generator 11 sets the diffusion code pn of a spectrum diffusion device 121 to which a modulated signal S1 is inputted for the transmission of the modulated signal S1, sent out of a base station 10, to the slave station 40n. Consequently, the modulated signal S1 which is spectrum-diffused with the diffusion code pn arrives at all the key stations 201-20m through the optical fiber 31 and is received by all the slave stations 401-40n, but only the slave station 40n having the same diffusion code pn can demodulates the specific modulated signal S1 and sends or receives a call to and from the corresponding slave station.

4. 发明专利

JPH03289223A BURST SIGNAL TRANSMISSION RADIO SYSTEM 失效
公开(公告)号：JPH03289223A
公开(公告)日：1991-12-19
申请号：JP8933290
申请日：1990-04-04
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： MIYAJIMA TAKAHIKO , KOMAKI SHOZO , HASHIMOTO AKIRA
IPC分类号： H04B7/15
摘要： PURPOSE:To increase number of branched routes effectively by grouping properly plural routes of a radio station having the plural branched routes using a same frequency band and applying switching control to a time when a signal is sent in the unit of each group by a prescribed method. CONSTITUTION:For example, routes B, D, F are grouped as group 1 and routes C, E are grouped as a group 2, and radio stations A, B, D, F connecting to the routes belonging to the group 1 make transmission/reception for a time T at a time interval 2T0 of t0, t2, t4,..., where T is shorter than the time T0. Moreover, radio stations A,C, E connecting to the routes belonging to the group 2 make transmission/reception for a time T at a time interval 2T0 of t1, t3, t5,.... Thus, signal transmission is implemented without simultaneous transmission/reception between the radio stations belonging to the group 1 and the radio stations belonging to the group 2 to generate lots of route number.

5. 发明专利

JPH03274924A CORDLESS COMMUNICATION SYSTEM 失效
公开(公告)号：JPH03274924A
公开(公告)日：1991-12-05
申请号：JP7589190
申请日：1990-03-26
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： NAKAMURA YASUHISA , OTSUKA HIROYUKI , MIYAJIMA TAKAHIKO , KOMAKI SHOZO , OGAWA HIROTSUGU , HIROTA TETSUO , AIKAWA MASAYOSHI
IPC分类号： H04B10/00 , H04B7/26 , H04B10/54 , H04B10/564 , H04W16/26 , H04W84/10
摘要： PURPOSE:To enlarge a call distance between a base unit and a hand set by making a call by using a radio propagation circuit and an optical fiber while maintaining the transmission outputs of a master set and a slave set at constant as they are. CONSTITUTION:A radio frequency from the slave set (b) is received by an antenna 1 and the radio frequency signal is inputted to an electro optical conversion circuit 3 while executing transmission/reception separation 2. Then, the signal is converted to an optical signal and inputted to an optical fiber 4. This signal is transmitted to an area A by the fiber 4 and photoelectrically converted 5 to a radio frequency signal. This signal passes through a transmission/ reception separator circuit 6 and transmitted through an antenna 7 for mutual connection with the master set (a) to the master set (a). On the other hand, the radio frequency signal from the master set is transmitted through the route of the antenna 7 - transmission 1 reception separator circuit 6 - electro optical conversion circuit 8 - optical fiber 9 - photoelectric conversion circuit 10 - transmission/reception separator circuit 2 -antenna 1, converted to the radio frequency signal - optical signal - radio frequency signal and transmitted to the hand set (b).

6. 发明专利

JPH0131812B2 失效
公开(公告)号：JPH0131812B2
公开(公告)日：1989-06-28
申请号：JP15017683
申请日：1983-08-19
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： ARAKI MASAHARU , KOMAKI SHOZO
IPC分类号： H04J11/00 , H04J99/00

7. 发明专利

JPS6412138B2 失效
公开(公告)号：JPS6412138B2
公开(公告)日：1989-02-28
申请号：JP21693282
申请日：1982-12-13
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： ARAKI MASAHARU , KOMAKI SHOZO
IPC分类号： H04J11/00 , H04B7/00

8. 发明专利

JPS6351608B2 失效
公开(公告)号：JPS6351608B2
公开(公告)日：1988-10-14
申请号：JP1814983
申请日：1983-02-08
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： MATSUE HIDEAKI , SAITO YOICHI , KOMAKI SHOZO
IPC分类号： H03M1/10 , H03M1/06 , H03M1/18 , H04L25/03

9. 发明专利

JPS5915223B2 JPS5915223B2 - 失效
公开(公告)号：JPS5915223B2
公开(公告)日：1984-04-07
申请号：JP3564379
申请日：1979-03-28
申请人： Nippon Telegraph & Telephone
发明人： KOMAKI SHOZO , HORIKAWA IZUMI , OKAMOTO SHIGEHARU
IPC分类号： H04B7/08
CPC分类号： H04B7/084

10. 发明专利

JPH04196629A COMMUNICATION METHOD 失效
公开(公告)号：JPH04196629A
公开(公告)日：1992-07-16
申请号：JP32159890
申请日：1990-11-26
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： TAKANASHI HITOSHI , KOMAKI SHOZO , KOHIYAMA KENJI
IPC分类号： H04B7/26 , H04B10/00
摘要： PURPOSE:To simplify the master station by using an optical fiber so as to send a high frequency signal of a base station to a master station, allowing the signal to radiate from an antenna to a slave station and using an optical fiber so as to send the signal from a slave station from the master station to the base station. CONSTITUTION:n-Sets of signals sent in a base station 20 are selected by a frequency division switch 1, the selected signal is subject to electrooptic conversion by an electrooptic converter 2 of each master station and the result is sent by an optical fiber 4. The signal is subject to optoelectric conversion by an optoelectric converter 3 in master stations 201-20n. and power-amplified and sent to a slave station by an antenna 7. Then the signal from a slave station is received by the antenna 7 and subject to electrooptic conversion by the electrooptic converter 2 and sent to a base station 20 through the optical fiber 4. Moreover, the signal is selected by a frequency division switch 9 in the base station 20. Since a high frequency signal is supplied from the base station 20 to remote master stations 201, 20n, the master stations 201, 20n are made small and simplified, the changeover of a radio wave radiating from the master stations 201, 20n is facilitated and the installation and maintenance of the master stations are facilitated.

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