| Patent Number |
Title Of Patent |
Date Issued |
| RE33547 |
Graded facsimile image signal coding system |
March 5, 1991 |
| A graded facsimile image signal coding system is disclosed which is provided with means for distributing a multi-graded facsimile picture signal, represented by 2.sup.n gradation levels, into n bit planes corresponding to n digits; initial encoding means for detecting, from picture e |
| RE32291 |
System for coding information change picture elements in facsimile signal |
November 18, 1986 |
| A system for coding information change picture elements in a facsimile signal, which is employed for coding the address of each information change picture element assuming information different from that of an immediately preceding picture element on each scanning line. A distance be |
| 6493390 |
Motion compensation image encoding device |
December 10, 2002 |
| A motion detecting device for enhancement of the image quality at ultra-low bit rates is disclosed, which permits quantization of the prediction error with the highest possible degree of accuracy, taking into account the amount of information which is generated by a motion vector generat |
| 6489988 |
Method and apparatus for detecting synchronization shift between original image and reproduced i |
December 3, 2002 |
| This invention aims to provide a method and apparatus for detecting a synchronization shift in which the synchronization shift between an original image and a reproduced image can be accurately detected even if noises are generated by a video codec or the like. An original image sent |
| 6414942 |
Traffic generator and method of determining a traffic generating function |
July 2, 2002 |
| A traffic generator for sending a pseudo-traffic onto a packet-switched network to evaluate the network performance and a traffic generating function determining method of optimizing generating functions (mathematical models) for a pseudo-traffic are provided. A traffic analysis unit |
| 6403391 |
Semiconductor light emitting device and method for manufacturing the same |
June 11, 2002 |
| At least a one conductivity type nanostructure PS layer whose thickness is controlled, and the opposite conductivity type nanostructure PS layer and a one conductivity type mesostructure PS layer arranged in contact with both these sides are comprised. Since the one conductivity type |
| 6385314 |
Transmission device control system equipped with high-efficiency coding scheme in communication |
May 7, 2002 |
| A control system for transmission devices equipped with a high-efficiency coding scheme in a communication network which avoids degradation of the quality of an acoustic signal for transmission and permits an efficient transfer of the acoustic signal. The control system has a structure i |
| 6377373 |
Optical transmission system |
April 23, 2002 |
| In an optical transmission, system, a trunk cable having two pairs of optical fibers is provided between first and second trunk stations to use one of the two pairs of the optical fibers for communication between the first and second trunk stations and the other for communication with fi |
| 6332123 |
Mouth shape synthesizing |
December 18, 2001 |
| A picture synthesizing apparatus, and method for synthesizing a moving picture of a person`s face having mouth-shape variations from a train of input characters, wherein the method steps comprise developing from the train of input character a train of phonemes, utilizing a speech synthes |
| 6331907 |
Multi-wavelength light source and discrete-wavelength-variable light source |
December 18, 2001 |
| In a light source for generating light containing multiple wavelengths substantially uniform in intensity, a wavelength demultiplexing element 10 (for example, waveguide-type wavelength selecting filter) demultiplexes input light into a plurality of wavelengths .lambda.1 through .lambda. |
| 6327060 |
Optical transmission system, optically branching apparatus and optical signal processing apparat |
December 4, 2001 |
| In an optical transmission system, an optical transmission line has up and down systems and loops back a supervisory light between the up and down systems. Trunk stations are provided at both ends of the optical transmission line and one or more optically branching units are provided |
| 6285477 |
Multi-wavelength light source and discrete-wavelength-variable light source |
September 4, 2001 |
| In a light source for generating light containing multiple wavelengths substantially uniform in intensity, a wavelength demultiplexing element 10 (for example, waveguide-type wavelength selecting filter) demultiplexes input light into a plurality of wavelengths .lambda.1 through .lambda. |
| 6259673 |
Route selection method |
July 10, 2001 |
| If an error range is specified with regard to the cost beforehand, a route satisfying all of a plurality of QoS conditions at a low cost and having a cost in the error range is selected as an optimum route. Such a route selection method is provided.At step S1, a plurality of QoS conditio |
| 6243421 |
Apparatus for decoding coded video data with reduced memory size |
June 5, 2001 |
| An apparatus for decoding coded video data is provided which is capable of decreasing the storage size of its frame memory while attenuating the drift noise and minimizing lowering of the resolution during the reconstruction of the coded video data. The apparatus comprises a data siz |
| 6219163 |
Multi-wavelength light source and discrete-wavelength-variable light source |
April 17, 2001 |
| In a light source for generating light containing multiple wavelengths substantially uniform in intensity, a wavelength demultiplexing element 10 (for example, waveguide-type wavelength selecting filter) demultiplexes input light into a plurality of wavelengths .lambda.1 through .lambda. |
| 6215566 |
Multi-wavelength light source and discrete-wavelength-variable light source |
April 10, 2001 |
| In a light source for generating light containing multiple wavelengths substantially uniform in intensity, a wavelength demultiplexing element 10 (for example, waveguide-type wavelength selecting filter) demultiplexes input light into a plurality of wavelengths .lambda.1 through .lambda. |
| 6201599 |
Optical transmission line monitoring apparatus |
March 13, 2001 |
| An apparatus for monitoring and measuring condition of a plurality of optical transmission lines individually according to this invention comprises at least one reflecting means having a predetermined reflection bandwidth arranged on each of said optical transmission lines; an optical |
| 6185020 |
Apparatus for detecting a fault location in an optical fiber line |
February 6, 2001 |
| Disposing optical fiber gratings 10a each reflecting a wavelength .lambda.1 which is different from a signal wavelength .lambda.s along an optical fiber line 10 at suitable intervals and positions. The wavelength .lambda.s of signal light is not reflected by the grating 10a, but tran |
| 6181449 |
Wavelength division multiplexed optical processing device and optical communication transmission |
January 30, 2001 |
| A wavelength division multiplexed optical processing device and an optical communication transmission path which are capable of significantly improving the transmission characteristic of wavelength division multiplexed optical signals. A wavelength division multiplexed optical proces |
| 6166687 |
Method for determining position of mobile earth station in satellite communication system |
December 26, 2000 |
| A method is disclosed for uniquely determining the position of a mobile earth station in a mobile satellite communication system which employs a non-geostationary satellite with a multi-spot beams. A given point of a preknown position on the earth surface is defined as the center coordin |
| 6160649 |
Optical power measuring system terminal station and repeater therefor |
December 12, 2000 |
| An oscillator oscillates at a predetermined reference frequency, and a reference signal light sender generates light (reference signal light) of a specific wavelength deeply modulated by output from the oscillator. A frequency divider frequency-divides the output from the oscillator into |
| 6141449 |
Coding mode determination system |
October 31, 2000 |
| This invention provides a mode determination system for maximizing the coding efficiency by minimizing the amount of generated encoded information. An intra-frame picture signal X of 16 pels 16 lines is divided into four sub-blocks of 8 pels.times.8 lines by a DCT block dividing unit |
| 6134523 |
Coding bit rate converting method and apparatus for coded audio data |
October 17, 2000 |
| Coding bit rate converting method and apparatus for coded audio data are disclosed to convert input coded audio data to output coded data of a coding bit rate lower than a target coding bit rate. A control output is taken out when the frame size of the input coded audio data is larger th |
| 6111937 |
Apparatus and method for automatically determining whether a telephone service user speaks the l |
August 29, 2000 |
| This invention is characterized by providing an apparatus for automatically discriminating service users which can prevent troubles from occurring between the service provider and users because of difference in language. When the service provider has a call from a user, the service provi |
| 6091538 |
Gain equalizing apparatus |
July 18, 2000 |
| An equalizing apparatus for equalizing gains of wideband wavelength-division multiplexed light and for improving the S/N ratio comprises a plurality of optical amplifyer for optically amplifying light in different wavelength groups, respectively; and multiplexer for multiplexing opti |
| 6088383 |
Spread-spectrum signal demodulator |
July 11, 2000 |
| A spread spectrum signal demodulator receives a received signal including a plurality of spread spectrum signals, and comprises at least one signal strength suppressing means, which reduces a correlation signal outputted from a first correlation detecting means or replica signals until t |
| 6084997 |
Coupled waveguide structure |
July 4, 2000 |
| The coupled waveguide structure comprises first and second rectangular waveguides, disposed closely. The aspect ratio of the first waveguide is substantially inverse in number to that of the second waveguide. |
| 6052734 |
Method and apparatus for dynamic data rate control over a packet-switched network |
April 18, 2000 |
| An amount of data to be distributed to each receiving terminal is dynamically controlled for each receiving terminal in response to a congestion of each of plural receiving terminals. When a determination of an RR (Reception Report) returned from the receiving terminal results in a v |
| 6026389 |
Video query and editing system |
February 15, 2000 |
| A video query and editing system which is capable of querying images without fast-forward and playback operations, to specify an editing start or end point easily, and to lower editing cost of compressed data. An edit control window is displayed (11) first, and then a file for query and |
| 6025879 |
System for moving object detection in moving picture |
February 15, 2000 |
| A system for detecting a moving object in a moving picture, which can detect a moving object by block directly with a highly-accurate, simple process without completely decoding the compressed moving picture data. The picture block coding mode, the motion compensation mode and the motion |
| 6011587 |
Packet video bitrate conversion system |
January 4, 2000 |
| An H. 261 encoder outputs coded video data together with a mode selection signal and a judging signal as to discarding or not of a packet. A packetizer receives the output signal from the H. 261 encoder and separately packetizes motion data and DCT data in the input coded data. A gat |
| 5978529 |
Gain equalizer and optical amplifying transmission line |
November 2, 1999 |
| This invention provides the gain equalizer positioned to an optical amplifying transmission line for equalizing gains of said optical amplifying transmission line, comprising a plurality of first optical filters varying transmittance periodically in at least predetermined wavelength |
| 5978122 |
Noise suppression method for wavelength division multiplexing transmission system |
November 2, 1999 |
| A method of suppressing noise and improving the optical transmission characteristic of a wavelength division multiplexing transmission system provides lights for suppressing noise from the light sources (NS1 and NS2) which are multiplexed on the wavelength division multiplexed signal. |
| 5969669 |
Method for determining position of mobile earth station in satellite communication system |
October 19, 1999 |
| A method is disclosed for uniquely determining the position of a mobile earth station in a mobile satellite communication system which employs a non-geostationary satellite with a multi-spot beams. A given point of a preknown position on the earth surface is defined as the center coordin |
| 5966228 |
Optical transmission system and optical repeater |
October 12, 1999 |
| An optical transmission system comprises transmission optical fibers 14 connected between an optical transmission terminal 10 and an optical receiving terminal 12 via optical amplifying repeaters 16, and equalizing fiber 18 each connected in each equalizing interval. The equalizing fiber |
| 5960063 |
Telephone speech recognition system |
September 28, 1999 |
| A telephone speech recognition system is provided which has a high level of speech recognition without affecting from various conditions of a telephone line. The system comprises speech analyzers (4) and (5), and reference speech model storages (7) to (9) corresponding to line connec |
| 5952683 |
Functional semiconductor element with avalanche multiplication |
September 14, 1999 |
| A functional semiconductor element, which is designed to perform an ultrafast amplifying, bistable, similar functional operation by initiating and stopping an avalanche multiplication in one of i-type layers of what is called a triangular barrier diode (TBD) structure having an n-i-p-i-n |
| 5940197 |
Optical add-drop device |
August 17, 1999 |
| The self-oscillation frequencies of injection-locked laser devices 5-1 through 5-M are preset to the frequency of the signal light to be transmitted by the optical add-drop device, and the self-oscillation frequencies of the injection-locked laser devices 6-1 through 6-N are preset t |
| 5937126 |
Optically amplifying/repeating transmission system and optical amplifier |
August 10, 1999 |
| An optical transmission system for optical transmission with the capacity of 100 Gb/S over a distance of 9,000 km or more includes an light sending station for outputting an optical signal in the band of 1.55 .mu.m, and an light receiving station connected to the light sending station by |
| 5930015 |
Optical access system |
July 27, 1999 |
| An optical access system is disclosed in which subscribers' terminals and optical coupler-splitters of nodes are maintenance-free and required control is effected on the part of the central office alone. At a first position, down-link optical digital signals are generated, which are made |
| 5926300 |
Optical add-drop multiplexer |
July 20, 1999 |
| The present invention is directed towards an optical ADM apparatus provided with a narrow band-pass filter which is capable of minimizing declination of the transmission characteristics. An optical transmission prohibiting element composed of an optical isolator and a fiber grating is co |
| 5912911 |
Optical short pulse reshaping device |
June 15, 1999 |
| An optical short pulse reshaping device capable of effectively eliminating noise from or reshaping of input optical short pulses of a pulse width of picosecond order shorter than a carrier life time. The device comprises: a semiconductor laser element, means for injecting an electric cur |
| 5912756 |
Light receiving device |
June 15, 1999 |
| To enable the filtering of a light signal without using an optical bandpass filter, the present invention provides the following construction: a light signal transmitted through an optical fiber enters an injection-locked laser device which is locked to the wavelength of the light signal |
| 5903375 |
Surveillance method of optical communication line |
May 11, 1999 |
| To enable the surveillance of a long-distance optical fiber line that a method using the reflection lights and Rayleigh backscatter lights cannot cover, a plurality of optical reflection elements P1-Pn are interposed in the optical fiber line at each specific distance. Each of the optica |
| 5898763 |
Equipment for facsimile call service of telephone exchange |
April 27, 1999 |
| An equipment for facsimile call service of a telephone exchange which can apply an unique charging system to a facsimile call by distinguishing the facsimile call from ordinary speech calls, notify a caller of cause when occurring a failure in transmitting the facsimile call, and advise |
| 5898719 |
Optical frequency stabilizer |
April 27, 1999 |
| In an optical frequency stabilizing device for stabilizing optical frequencies of transmission lasers even when optical frequency reference is shut off, an optical shutter 44 is normally held in its open state to pass optical frequency reference light from an optical network to an in |
| 5898714 |
Optical pulse generator |
April 27, 1999 |
| An optical pulse generator, capable of generating ultrashort optical pulses suitable for optical soliton transmission, includes a DFB laser 10 for continuous laser oscillation, an electroabsorbtion modulator 12 for creating a sequence of optical pulses of the pulse width 14.6 ps from |
| 5898502 |
Optical wavelength monitoring apparatus |
April 27, 1999 |
| In an optical wavelength monitoring apparatus for easily monitoring wavelength deviation, light introduced from a laser source 10 to an optical transmission line 12 is divided by directional couplers 14, 20. Optical output of the directional coupler 14 is converted into an electrical |
| 5892881 |
Method and apparatus for transmitting dubbing data of digital VTR |
April 6, 1999 |
| An encoding control unit obtains a quantization step size and a video encoding rate Rc on the basis of various kinds of conditions including a transmission time and image quality specified through an input unit by a user, and property of image contents from a signal compression processin |
| 5892608 |
Optical receiver device for dark soliton lightwave |
April 6, 1999 |
| An optical transmitter which reverses the ON-OFF state of the optical intensity of a bright soliton lightwave and generates a dark soliton lightwave having an optical phase shift, an optical receiver for the dark soliton lightwave, and a superfast, high-capacity optical transmission |
