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1. 发明专利

JP2000049711A OPTICAL COMMUNICATION SYSTEM AND REPEATER 失效
公开(公告)号：JP2000049711A
公开(公告)日：2000-02-18
申请号：JP10419699
申请日：1999-04-12
申请人： BRITISH TELECOMM
发明人： STALLARD WILLIAM A , ELLIS ANDREW D , MALYON DEREK JOHN
IPC分类号： H04B10/04 , H01S5/00 , H01S5/06 , H01S5/068 , H01S5/50 , H03G3/20 , H03G3/30 , H04B10/00 , H04B10/02 , H04B10/06 , H04B10/08 , H04B10/14 , H04B10/17 , H04B10/29 , H04B10/16
摘要： PROBLEM TO BE SOLVED: To reduce power fluctuations due to the outer factor of seawater temperature and the like overlapping low frequency control tone with an optical signal and supplying it at a place, where the optical signal is generated for the first time. SOLUTION: An AGC circuit is provided with a low-noise amplifier 26 generating output proportional to the amplitude of control tone and a difference amplifier 27 connected in parallel to a resistor 28 installed in a line 24, so that it generates output proportional to the current of the resistor 28, namely a drive current toward a laser amplifier 20. When the performance of an optical system fluctuates due to a temperature change, for example, the output power of a facet 22 fluctuates and the amplitude of a corresponding wave pattern in the line 24 also fluctuates. The amplifier 26 responds to the amplitude of control tone, and therefore a signal to a multiplier 29 fluctuates. A comparator 30 detects the fluctuation and resets a device 23.

2. 发明专利

JPH09510062A 失效
公开(公告)号：JPH09510062A
公开(公告)日：1997-10-07
申请号：JP52330795
申请日：1995-03-08
申请人： UNIV OXFORD BROOKES , BRITISH TELECOMM
IPC分类号： H04M3/00 , H04L12/54 , H04L12/70 , H04L12/935 , H04Q3/00 , H04Q11/04 , H04L12/28

3. 发明专利

JPH08304662A OPTICAL FIBER COUPLER 失效
公开(公告)号：JPH08304662A
公开(公告)日：1996-11-22
申请号：JP24373195
申请日：1995-08-28
申请人： BRITISH TELECOMM
发明人： DABITSUDO BURAIAN MOOTEIMOA
IPC分类号： G02B6/28 , C03B37/14 , G02B6/255 , G02B6/34
摘要： PROBLEM TO BE SOLVED: To substantially flatten coupling ratio characteristics to a wave length by setting a predetermined length equal to a minimum length in which the coupling ratios in two preselected wave lengths become equal to each other in the first place when an optical fiber coupler is formed. SOLUTION: The propagation light of first optical fiber forms a coupling area coupled with second optical fiber, and coupling constants of both optical fibers are set to a preset value, and a difference is arranged in respective propagation constants of both optical fibers in the coupling area, and a length of its coupling area is elongated, and when coupling constants of two preset wave lengths become equal to each other in the first place, a process of elongating a length of its coupling area is stopped. That is, like (b), for example, in the first crossing area marked with (x) of a curve of 3μm and 1.5μm, a coupler has the coupling ratios equal in both wave lengths, and the coupling ratios are selected by selecting a difference in a propagation constant. Elongation is monitored by a wave length of 1.52μm and 1.3μm, and is stopped at a point where coupling factors become equal to each other.

4. 发明专利

JPH08237655A PICTURE TRANSMISSION METHOD,PICTURE ENCODING DEVICE AND RECEIVER 失效
公开(公告)号：JPH08237655A
公开(公告)日：1996-09-13
申请号：JP30993595
申请日：1995-11-01
申请人： BRITISH TELECOMM
发明人： WELSH WILLIAM JOHN , FENN BRIAN ALAN , CHALLENER PAUL
IPC分类号： G06K9/62 , G06T9/00 , G10L15/24 , G10L21/06 , H03M7/36 , H04N1/41 , H04N7/26 , H04N7/32 , H04N7/24
摘要： PROBLEM TO BE SOLVED: To transmit a substantially moving human face in an extremely small data volume by obtaining data of mouth shapes corresponding to a transmitted codeword and combining the obtained data with data representing the image of one frame. SOLUTION: A transmitter 1 receives a video signal corresponding to a speaker's face from a video signal source such as an image pickup device, sends the video signal to a receiver 3 together with voice through a transmission line 2 and the receiver 3 displays the received image of the speaker's face on a picture display device such as a CRT display device. Since the movement of a large part of the face is less than that of a mouth area 6 in normal speech, the volume of information can be reduced by transmitting an image related to a face 5 and the change of a mouth shape. Since the change of the mouth shape in a speech can be represented by a comparatively small number of typical shapes, a code table representing mouth shapes is previously generated and transmitted to the receiver 3, so that information to be transmitted as the mouth shape can be restricted only to a code word sequence for identifying the mouth shape.

5. 发明专利

JPH07220116A METHOD AND APPARATUS FOR INTERPOLATION OF FRAME OF MOVING IMAGE BY USING THREE-DIMENSIONAL SHAPE MODEL 失效
公开(公告)号：JPH07220116A
公开(公告)日：1995-08-18
申请号：JP21477992
申请日：1992-07-21
申请人： KOKUSAI DENSHIN DENWA CO LTD , BRITISH TELECOMM
发明人： KOIKE ATSUSHI , KANEKO MASAHIDE , HATORI YOSHINORI , MAAKU ANDORIYUU SHIYATSUKURUTO , UIRIAMU JIYON UERUSHIYU
IPC分类号： H04N7/26 , G06T15/70 , H04N7/24
摘要： PURPOSE: To improve block-shaped distortion in an interpolated frame and reproduce smooth motion, even when an input image has motion in a three- dimensional space by performing the frame interpolation of the animation images using the three-dimensional shape model. CONSTITUTION: Encoded data sent from a transmission side through an input terminal 1 are decoded by a decoding part 2, for obtaining current gradation information. The gradation information is stored in a frame memory 3 and then sent to a frame interpolation part 5, together with the gradation information in the last frame read out of a frame memory 4. Simultaneously, a three- dimensional shape model deformation part 7 deforms the three-dimensional shape model of a transmit frame read out of a three-dimensional shape model storage part 9. Then the obtained light-shape information, three-dimensional shape model, and three-dimensional shape model in the interpolated frame are used to interpolate the gradation information of the interpolated frame by the frame interpolation part 5.

6. 发明专利

JPH07212347A WAVELENGTH MULTIPLEXING LIGHT COMMUNICATION SYSTEM 失效
公开(公告)号：JPH07212347A
公开(公告)日：1995-08-11
申请号：JP1020295
申请日：1995-01-25
申请人： HITACHI LTD , BRITISH TELECOMM
发明人： TSUSHIMA HIDEAKI , PIITAA EDOWAADO BAANZURII , ARAN MAKUGAIA
IPC分类号： H04J14/00 , H04B10/20 , H04J14/02 , H04J14/08 , H04L7/00 , H04Q11/00 , H04L12/40
摘要： PURPOSE: To simplify an optical transmitter without limiting the number of stations to the number of wavelengths in use by transmitting signals having a wavelength selected out of a plurality of simultaneously available signaling wavelengths. CONSTITUTION: A head station 2 has laser diodes 6-0 to 6-4 which generate continuous lights having wavelengths λ0 to λ4. The wavelength λ0 is used for signaling control signals and the wavelengths λ1 to λ4 are used for data transmission. A coupling device 7 combines the wavelengths and supplies the combined wavelength to a terminal station (1m) through an amplifier 8, an optical coupler 9, and an optical fiber (3m). A receiver 17 receives the wavelength λ0, converts the wavelength into an electric signal, and transmits signals corrected to the wavelength λ0 from a laser diode 19 through a processor 18. A processor 18 adds the corrected signals to latest-received data to indicate that a packet from a station 1m to another station 1n is transmitted with the wavelength λ3 in the next time slot and the wavelength λ3 is not vacant.

7. 发明专利

JPH06112771A ADAPTIVE RECOGNITION DEVICE 失效
公开(公告)号：JPH06112771A
公开(公告)日：1994-04-22
申请号：JP5488593
申请日：1993-02-18
申请人： BRITISH TELECOMM
发明人： JOHNSTON ROBERT DENIS
IPC分类号： H03H21/00 , G06K9/62 , G06T7/00 , H03H17/00 , H03H17/02 , H03H17/06 , H04B3/03 , H04B3/04 , H04B3/23 , H04B3/54
摘要： PURPOSE: To estimate a response signal with little storage capacity and to enable the high-speed correction of a difference from an actual response signal by connecting plural address lines between the memory cell of input storage circuit and plural storage elements at random. CONSTITUTION: Respective RAM 34 are further provided with more addresses and address lines, and this address line is connected to the memory cell of an input storage circuit 30 to random. The plural address lines are collected into a group 32 and connected to the respective memory cells of the input storage circuit 30. The respective address lines detect the contents of a specified memory cell, and the group 32 of address lines supplies the respective addresses of a RAM 34. A word showing a partial estimated value corresponding to the contents of the input storage circuit 30 is stored at the respective addresses of RAM 34. A total estimated value is generated by adding such partial estimated values. From the relation between this total estimated value and the response signal received, a corrected value and an updated value can be provided.

8. 发明专利

JPH05304337A 失效
公开(公告)号：JPH05304337A
公开(公告)日：1993-11-16
申请号：JP9003392
申请日：1992-03-12
申请人： BRITISH TELECOMM
发明人： FUIRITSUPU JIYON FUIDEIMENTO , RESURII DEBITSUDO UESUTOBURUTS , ANDORIYUU UIRIAMU NERUSON
IPC分类号： G02B6/122 , G02B6/12 , H01L21/205 , H01L21/306 , H01L33/00 , H01S3/06 , H01S5/00 , H01S5/12 , H01S5/22 , H01S3/18
摘要： PURPOSE: To enable manufacturing by a simple process and improve the oscillation efficiency of an obtd. ridge waveguide laser element by forming ridges, using a metallic layer as a mask and also forming regions swollen from bases. CONSTITUTION: This method comprises forming planar wiring layers 7, 8 on bases 1, 3, 4, 5, which form dielectric layers 9-11 first on this surface and then resist films thereon. There are provided windows through the resist films, the dielectric layers 9-11 are etched through the windows to expose planar semiconductor layer 8, and the dielectric layers 9-11 are removed in forms creeping along the resist films, metallic layers 14, 15 are deposited in the form of windows on the exposed surface of the semiconductor layer 8. The resist films are removed and metals deposited thereon, and the planar semiconductor layers 7, 8 are etched, using the metallic layers 14, 15 as masks so as to leave ridges 7", 8" swollen from the surfaces of the bases 1, 3, 4, 5 at these regions.

9. 发明专利

JPH05249321A 失效
公开(公告)号：JPH05249321A
公开(公告)日：1993-09-28
申请号：JP21290591
申请日：1991-07-29
申请人： BRITISH TELECOMM
发明人： MAIKERU HARII RIIBU , SUTEFUAN ANSONII KIYASHIDEI
IPC分类号： G02B6/46 , G02B6/04 , G02B6/44 , H02G1/08 , G02B6/00
摘要： PURPOSE: To easily lay optical fibers and to facilitate the addition and maintenance of the optical fibers by forming tubular ductlets in a power cable and housing the optical fibers therein. CONSTITUTION: A pipeline 11 has the ductlets 12 for forming tubular progressing paths along the longitudinal direction and the optical fibers 12 are loosely housed in the ductlets 12. The pipeline 11 has a core 13 at its central part. The pipeline 11 is formed of an extrusion molded material and the ductlets 12 are formed at the time of extrusion molding. To insert the optical fibers 14 into the ductlets 12, the front ends of the optical fibers 14 to be inserted are inserted into the ductlets 12 and the flow of a gaseous medium is formed at the flow velocity higher than a progression speed to progress the optical fibers 14 inserted into the ductlets 12. As a result, the damage of the optical fibers 14 is prevented and even if joints are branched at the pipeline 11, there is no need for providing the optical fibers 14 with the joints.

10. 发明专利

JPH03205928A VEHICLE COMMUNICATION SYSTEM 失效
公开(公告)号：JPH03205928A
公开(公告)日：1991-09-09
申请号：JP11730290
申请日：1990-05-07
申请人： BRITISH TELECOMM
发明人： JIYON RENAADO ADAMUSU , BINSENTO JIYOSEFU SUKINAA
IPC分类号： H04B7/26 , H04L12/56 , H04Q11/04 , H04W36/12 , H04W92/20
摘要： PURPOSE: To obtain a vehicle telephone system having an improved ability by providing a control interface unit and locally processing control information. CONSTITUTION: When the users 30 and 31 of vehicle telephone sets respectively communicate with the users 46 and 45 of other telephone sets, digital speed signals and other information are sent to a control interface 13a which generates control information and packeted speed information, pass through a route block 41 through switches 50 and 52, and reach a base station 23 through a control interface 23a. The interface 13a generates packeted speed destination addresses and causes switches 50-52 to decide the method for routing calls so as to secure reception at proper destinations. Therefore, passages are set with the minimum delay and minimum processing load.

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