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1. 发明专利

JPH0828681B2 失效
公开(公告)号：JPH0828681B2
公开(公告)日：1996-03-21
申请号：JP29025493
申请日：1993-11-19
申请人： HITACHI LTD
发明人： TAKASAKI YOSHITAKA
IPC分类号： H04B10/03 , H04B10/032 , H04B10/07 , H04B10/08 , H04B10/02

2. 发明专利

JPH06350547A MULTIPLEX TRANSMITTING SYSTEM FOR DIGITAL SIGNAL 失效
公开(公告)号：JPH06350547A
公开(公告)日：1994-12-22
申请号：JP13311093
申请日：1993-06-03
申请人： HITACHI LTD
发明人： TAKASAKI YOSHITAKA
IPC分类号： H04J3/00 , H04J3/04
摘要： PURPOSE:To reduce the power consumption of circuit elements and to miniaturize a signal processor by interleaving plural digital information signals and multiplex frame control signals during a period of frame time and performing multiplex transmission. CONSTITUTION:A multiplex frame control signal generation circuit 2 generates a multiplex frame control signal mf by multiplexing frame control signals ap, bp and cp within a certain period of frame time. The bit rate of the control signal mf within one frame is equal to the bit rate of respective information signals. A multiplexer circuit 3 interleaves the signal mf and information trains (a), (b) and (c) at every bit. At such a time, a multiplex signal (m) is provided by extracting pulses in order of signals mf, (a), (b) and (c) and arranging 4 bits within a time slot T of one bit. The signal (m) is inputted through a transmission line 6 to a separation circuit 4 on a reception side and separated into the signal mf, (a), (b) and (c) and the signal mf is separated into frame control signals a'p, b'p and c'p by a frame separation circuit 5.

3. 发明专利

JPH0618349B2 失效
公开(公告)号：JPH0618349B2
公开(公告)日：1994-03-09
申请号：JP5575584
申请日：1984-03-23
申请人： HITACHI LTD
发明人： TAKAHASHI YASUSHI , SASAKI SHINYA , YAMASHITA KIICHI , TAKASAKI YOSHITAKA
IPC分类号： H04B10/61 , H01S3/10 , H01S5/042 , H01S5/06 , H01S5/062 , H04B10/00 , H04B10/2507 , H04B10/516 , H04B10/524 , H04B10/54 , H04B10/04 , H01S3/103 , H04B10/06

4. 发明专利

JPH05136775A MULTI-STAGE REPRODUCTION RELAY SYSTEM 失效
公开(公告)号：JPH05136775A
公开(公告)日：1993-06-01
申请号：JP29547591
申请日：1991-11-12
申请人： HITACHI LTD , HITACHI CABLE
发明人： KOBAYASHI NAOYA , TAKASAKI YOSHITAKA , MIZOKAWA SADAO , MARUYAMA HISAYUKI , MABUCHI HIROSHI , AMADA EIICHI
IPC分类号： H04L7/00 , H04L7/027 , H04L7/033
摘要： PURPOSE:To provide a means suppressing accumulation of alignment jitter especially. CONSTITUTION:A fixed or variable delay element 6 having a delay more than a transmission delay caused in a signal processing circuit 8 is inserted to a timing extract circuit 3. Thus, the signal processing delay is set equivalently to 0 or a negative value by inserting the fixed or variable delay element 6 to the timing system thereby completely preventing the accumulation of alignment jitter. Moreover, it is not necessarily required to be set equal to the logic delay and in the case of the variable delay element 6, when the logic delay is largely changed, since the setting value of the variable delay element 6 is easily changed, the flexible system design is attained. That is, the reproduction repeater with less jitter accumulation is easily realized without changing the design parameter.

5. 发明专利

JPH02238736A OPTICAL SUBSCRIBER TRANSMISSION SYSTEM 失效
公开(公告)号：JPH02238736A
公开(公告)日：1990-09-21
申请号：JP5770789
申请日：1989-03-13
申请人： HITACHI LTD
发明人： TAKASAKI YOSHITAKA
IPC分类号： G02B6/00 , H04B10/25 , H04B10/27 , H04B10/272 , H04B10/29 , H04M3/00 , H04Q3/42
摘要： PURPOSE:To obtain an optical subscriber transmission system not requiring the installation of an auxiliary transmission line by inserting a multiplexer/ demultiplexer to both ends of an optical transmission line at system expansion so as to constitute the auxiliary transmission line. CONSTITUTION:The signal is transmitted as it is by connecting optical multiplexer/demultiplexers 100, 110 to both ends of an optical transmission line when the wavelength of a light source mounted to active transmitter- receivers 18, 19 is in matching with one of the wavelength of the pass band of the optical multiplexer/demultiplexers 100, 110. When other wavelength of the pass band of the optical multiplexer/demultiplexers 100, 110 is coincident with the wavelength of the light source for transmitter-receiver of an expanded system, the auxiliary line is constituted by using the light of the wavelength. Thus, it is not required to install the auxiliary transmission line in advance to constitute an economical system.

6. 发明专利

JPH0276356A COMMUNICATION NETWORK CONTROL METHOD, COMMUNICATION METHOD, COMMUNICATION NODE, LINE TERMINATOR AND COMMUNICATION TERMINAL EQUIPMENT 失效
公开(公告)号：JPH0276356A
公开(公告)日：1990-03-15
申请号：JP22661288
申请日：1988-09-12
申请人： HITACHI LTD
发明人： TAKASE MASAHIKO , TAKATORI MASAHIRO , TAKEMURA YOSHIAKI , KOBAYASHI NAOYA , SAWADA YASUSHI , NAKANO YUKIO , TAKAHASHI YASUSHI , FURUYA MASAHIRO , TAKASAKI YOSHITAKA
IPC分类号： H04M3/36 , H04L12/24 , H04L12/801 , H04L12/911 , H04M3/00 , H04Q3/66
摘要： PURPOSE:To ensure the prescribed communication quality even at the increase in traffic by providing a mechanism notifying the required communication quality to a communication node and selecting a path so that the requested communication quality is ensured based on traffic information measured and estimated by the communication node and a network controller. CONSTITUTION:Communication seeds 11a-11c use traffic measuring instruments 17a-17c and line quality measuring instruments 18a-18c to measure the line quality of communication links 12a-12c tying the communication nodes and the state of traffic passing through the communication nodes. Then the data are stored to a data base 15. A data analyzer 19 utilizes a data stored in the data base 15 to predict the succeeding traffic state and line quality and to calculate a routing strategy to obtain prescribed quality. A network controller, based on the result, commands a path to obtain prescribed quality to call controllers 16a-16c. Thus, the network is operated efficiently with respect to the communication quality requested by various users.

7. 发明专利

JPS6451743A COMMUNICATION METHOD 失效
公开(公告)号：JPS6451743A
公开(公告)日：1989-02-28
申请号：JP20811487
申请日：1987-08-24
申请人： HITACHI LTD
发明人： TAKASE MASAHIKO , TAKASAKI YOSHITAKA
IPC分类号： H04L12/52 , H04Q11/04
摘要： PURPOSE:To attain efficient utilization by setting a path only when a call data transfer request exists and opening the path only when a call awaits the data transmission so as to apply intermittent transfer of lots of capacity data for plural calls by means of various network terminators in common. CONSTITUTION:When a call request comes from a terminal equipment 11, a subscriber line terminator 12 sends a call request to a line concentrator 13. The line concentrator 13 sends a synchronizing pattern to take frame synchronism of the subscriber link to the subscriber line terminator. The subscriber line terminator 12 informs the destination number and the communication mode identification signal to the network through the subscriber line signal channel. The line concentrator 13, exchanges 14, 14' and a receiver side line concentrator 13' use a destination number to select a path and to register the channel to adaptors 15, 15', 16, 16'. When the existing registration channel exists, it is arranged in a queue. When the queue is longer than a prescribed value, other channel is assigned newly.

8. 发明专利

JPS63146546A CONFERENCE TELEPHONE SYSTEM 失效
公开(公告)号：JPS63146546A
公开(公告)日：1988-06-18
申请号：JP29231186
申请日：1986-12-10
申请人： HITACHI LTD
发明人： TAKASAKI YOSHITAKA , IMOTO KATSUYUKI , TAKASE MASAHIKO
IPC分类号： H04M3/56
摘要： PURPOSE:To attain a conference telephone system easily identifying a caller with low cost by detecting an output of a microphone corresponding to a caller and driving/displaying an utterance display device exclusive for each talker. CONSTITUTION:When a participant A makes an utterance on a microphone 11, it is distributed to transmission lines 52, 62 via a transmission line 31, and an utterance signal of the participant A applied to an utterance detection amplifier 8 from the transmission line 62 blinks a lamp 1 and is supplied to a participant C by a speaker 2. This is similar as to other participants. Since the caller is easily identified and the system is constituted without using a picture equipment and a transmission line, the cost is reduced and an economical conference telephone system with rich in feeling of presence is realized.

9. 发明专利

JPS62291229A FREQUENCY REPRODUCING CIRCUIT 失效
公开(公告)号：JPS62291229A
公开(公告)日：1987-12-18
申请号：JP13365786
申请日：1986-06-11
申请人： HITACHI LTD
发明人： TAKAHASHI YASUSHI , TAKASAKI YOSHITAKA
IPC分类号： H04L7/00 , H03L7/06 , H03L7/181 , H04L7/02 , H04L7/033 , H04L25/49
摘要： PURPOSE:To regenerate an original signal clock by applying feedback so that the difference between the number of output pulses and the number of the receiving pulses of a voltage controlled oscillator is '0' in a timing reproducing circuit used for non-synchronizing transmission in digital transmission. CONSTITUTION:A receiving pulse inputted to an input terminal 1 and the output pulse of a voltage controlled oscillator 6 are respectively counted by pulse counters 2-1 and 2-2, the result is inputted to a pulse number comparator 3 and the difference in the number of both pulses is obtained. The difference is changed to a voltage level by a digital-analog converting circuit 4, next, amplified by a feedback amplifier 5 and fed back to the voltage control oscillator 6. Thus, since the number of receiving pulses and the number of output pulses of the voltage controlled oscillator 6 are controlled so as to come to be the same number, a clock frequency can be regenerated even when the bright line component of the clock is not present at the receiving pulse.

10. 发明专利

JPS61182343A TIMING TRANSMISSION SYSTEM 失效
公开(公告)号：JPS61182343A
公开(公告)日：1986-08-15
申请号：JP2163085
申请日：1985-02-08
申请人： HITACHI LTD
发明人： TAKASAKI YOSHITAKA
IPC分类号： H04L7/00
摘要： PURPOSE:To improve the profitability and flexibility of the titled system by inserting a delay element into the timing system to attain the expansion of transmission range and release of limitation to a specific pattern in a digital transmission reception device producing a prescribed delay time between the reception and transmission for signal processing. CONSTITUTION:A reception signal from an input terminal 1 is amplified to a prescribed level by a receiver 2. Then a clock is extracted by a timing extraction circuit 3 and a signal decoded by a decoding circuit 5 is fed to a CPU7 via a logical circuit 6. On the other hand, a signal from a computer via the logical circuit is coded by a coding circuit 8 and sent from an output terminal 10 via a transmitter 9. Since the clock pulse used for logical processing in this system is delayed by a delay element 4 by a share of delay in the logical processing, no increasing in alignment jitter is incurred.

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