专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

1. 发明专利

JPH0244408B2 失效
公开(公告)号：JPH0244408B2
公开(公告)日：1990-10-03
申请号：JP18418784
申请日：1984-09-03
申请人： NIPPON DENKI KK , NIPPON DENSHIN DENWA KK
发明人： MARUYAMA TADASUKE , FUDA HITOSHI , YASUKAWA HIROSHI , SHIMADA MASAHARU
IPC分类号： H03F3/60 , H03F3/62 , H04B3/23

2. 发明专利

JPS6218096B2 失效
公开(公告)号：JPS6218096B2
公开(公告)日：1987-04-21
申请号：JP3143880
申请日：1980-03-11
申请人： NIPPON DENKI KK , NIPPON DENSHIN DENWA KK
发明人： FURUYA YOSHIJI , FUDA HITOSHI , AOYANAGI MASARU , OGURA HARUO
IPC分类号： H04M3/54 , H04B3/36 , H04B3/38 , H04Q1/54 , H04Q3/42

3. 发明专利

JPS6213857B2 失效
公开(公告)号：JPS6213857B2
公开(公告)日：1987-03-30
申请号：JP3143680
申请日：1980-03-11
申请人： NIPPON DENKI KK , NIPPON DENSHIN DENWA KK
发明人： HAGIWARA YUKIO , FUDA HITOSHI , AOYANAGI MASARU , OGURA HARUO
IPC分类号： H04M3/54 , H04B3/36 , H04B3/38 , H04Q1/54 , H04Q3/42

4. 发明专利

JPH0522404B2 失效
公开(公告)号：JPH0522404B2
公开(公告)日：1993-03-29
申请号：JP18418884
申请日：1984-09-03
申请人： NIPPON DENSHIN DENWA KK , NIPPON DENKI KK
发明人： MARUYAMA TADASUKE , FUDA HITOSHI , YASUKAWA HIROSHI , SHIMADA MASAHARU
IPC分类号： H03G3/20

5. 发明专利

JPH037308B2 失效
公开(公告)号：JPH037308B2
公开(公告)日：1991-02-01
申请号：JP18361483
申请日：1983-09-30
申请人： NIPPON DENKI KK , NIPPON DENSHIN DENWA KK
发明人： ITO YASUO , FURUYA YOSHIJI , FUDA HITOSHI , SHIMADA MASAHARU
IPC分类号： H04M3/56

6. 发明专利

JP2785336B2 失效
公开(公告)号：JP2785336B2
公开(公告)日：1998-08-13
申请号：JP15164789
申请日：1989-06-13
申请人： NIPPON DENKI KK
发明人： FUDA HITOSHI
IPC分类号： H04M1/60 , H04B3/23 , H04M9/08

7. 发明专利

JPH0563761A LINE FAULT DETECTION SYSTEM 失效
公开(公告)号：JPH0563761A
公开(公告)日：1993-03-12
申请号：JP21947591
申请日：1991-08-30
申请人： NEC CORP , MIYAGI NIPPON DENKI KK
发明人： FUDA HITOSHI , MIZUSAWA SHUICHI
IPC分类号： H04L1/16 , H04L29/14
摘要： PURPOSE:To quickly find out a fault of a transmission line. CONSTITUTION:A sender side transmission section is provided with a time information addition section 1, which adds a time information signal to data and sends the result, data and the information signal are separated through a time information detection and signal separations section 3 provided in a receiver side reception section and the content of the time information signal is sent to a control section 2. The control section 2 awaits the processing by a designated time till succeeding data comes to the time information addition section 1, and when the time information signal added to a head of the succeeding data is not normally sent, re-transmission is made and discrimination of alarm is given. Thus, intermission of data on its way is not caused and even when a transmission line is physically disconnected, it is detected as a fault.

8. 发明专利

JPH04241562A IN-BAND SIGNALING TRANSMITTER 失效
公开(公告)号：JPH04241562A
公开(公告)日：1992-08-28
申请号：JP1596591
申请日：1991-01-14
申请人： NEC CORP , MIYAGI NIPPON DENKI KK
发明人： FUDA HITOSHI , MIZUSAWA SHUICHI
IPC分类号： H04M7/00 , H04Q1/30 , H04Q1/446
摘要： PURPOSE:To obtain the in-band signaling transmitter which can execute signaling even when any loss is generated on a line. CONSTITUTION:An instruction from a control part 19 is transmitted only in the case of no speaking while stopping the transmission of a detection signal during speaking according to the state of speaking or the state of an instruction from an in-band signal detector 18. A signal generator 15 at a transmission part receives a control signal according to information from the control part 19. When the control signal from a counter device (in-band signaling transmitter 3B) is detected by a detector 18 at the reception part of a transmitter 3A, the control signal is inputted from the detector 18 to the control part 19, and a logical output is transmitted so as to increase/decrease the gain of a variable gain controller 16. When starting speaking an SS signal from any one of the transmitters 3A and 3B is detected at an SS detector 17 and passed through the control part 19, and the transmission of an in-band signal is stopped. On the side of detecting the SS, the correction of the loss is stopped and on the side of the counter in-band signaling transmitter, the in-band signal is eliminated as well. Then, when an SR is detected, the correction of the loss is stopped.

9. 发明专利

JP2638280B2 失效
公开(公告)号：JP2638280B2
公开(公告)日：1997-08-06
申请号：JP25980590
申请日：1990-09-28
申请人： NIPPON DENKI KK
发明人： FUDA HITOSHI
IPC分类号： H04B7/14 , H04B7/15

10. 发明专利

JPH05300550A 失效
公开(公告)号：JPH05300550A
公开(公告)日：1993-11-12
申请号：JP10428592
申请日：1992-04-23
申请人： NEC CORP , MIYAGI NIPPON DENKI KK
发明人： FUDA HITOSHI , MIZUSAWA SHUICHI
IPC分类号： H04M7/00 , H04Q1/30
摘要： PURPOSE:To suppress the noises produced on a receiver circuit without attenuating the signaling intra-band signal. CONSTITUTION:An intra-band signal transmitting device 3 contains a noise detector 17 which detects the noises out of the signals received from a receiving point 13. Then a noise suppressing received signal attenuator 18 is provided at the next stage of a signaling intra-band signal cutting filter 21 and controlled by the detector 17. Thus the noises detected by the detector 17 are suppressed by the attenuator 18 and the noiseless signals are transmitted to a telephone receiver line.

你已经成功收藏专利！

检索式保存成功!

IPRDB

热门服务

关于我们

友情链接

联系方式