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| Number | Title | Issue Date |
| 6493390 | Motion compensation image encoding device 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 gen... | 12/10/2002 |
| 6489988 | Method and apparatus for detecting synchronization shift between original image and reproduced image of video signal 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... | 12/03/2002 |
| 6414942 | Traffic generator and method of determining a traffic generating function 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 prov... | 07/02/2002 |
| 6403391 | Semiconductor light emitting device and method for manufacturing the same 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. Si... | 06/11/2002 |
| 6385314 | Transmission device control system equipped with high-efficiency coding scheme in communication network 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... | 05/07/2002 |
| 6377373 | Optical transmission system 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 th... | 04/23/2002 |
| 6332123 | Mouth shape synthesizing 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 pho... | 12/18/2001 |
| 6331907 | Multi-wavelength light source and discrete-wavelength-variable light source 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 wavel... | 12/18/2001 |
| 6327060 | Optical transmission system, optically branching apparatus and optical signal processing apparatus 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... | 12/04/2001 |
| 6285477 | Multi-wavelength light source and discrete-wavelength-variable light source 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 wavel... | 09/04/2001 |
| 6259673 | Route selection method 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 st... | 07/10/2001 |
| 6243421 | Apparatus for decoding coded video data with reduced memory size 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 a... | 06/05/2001 |
| 6219163 | Multi-wavelength light source and discrete-wavelength-variable light source 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 wavel... | 04/17/2001 |
| 6215566 | Multi-wavelength light source and discrete-wavelength-variable light source 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 wavel... | 04/10/2001 |
| 6201599 | Optical transmission line monitoring apparatus 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 ... | 03/13/2001 |
| 6185020 | Apparatus for detecting a fault location in an optical fiber line Disposing optical fiber gratings 10a each reflecting a wavelength λ1 which is different from a signal wavelength λs along an optical fiber line 10 at suitable intervals and positions. The wavelength λs of signal light is not reflected by the grating 10... | 02/06/2001 |
| 6181449 | Wavelength division multiplexed optical processing device and optical communication transmission path 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 divisi... | 01/30/2001 |
| 6166687 | Method for determining position of mobile earth station in satellite communication system 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... | 12/26/2000 |
| 6160649 | Optical power measuring system terminal station and repeater therefor 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 th... | 12/12/2000 |
| 6141449 | Coding mode determination system 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×8 lines by a... | 10/31/2000 |
| 6134523 | Coding bit rate converting method and apparatus for coded audio data 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 in... | 10/17/2000 |
| 6115156 | Demultiplexer device for wavelength-division multiplexed optical fiber communication A demultiplexer device is used in a wavelength-division multiplexed optical fiber communication line to achieve efficient dispersion compensation and loss compensation as well as a reduction of active devices such as optical amplifiers. The demultiplexer ... | 09/05/2000 |
| 6111937 | Apparatus and method for automatically determining whether a telephone service user speaks the language of the service 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 ca... | 08/29/2000 |
| 6091538 | Gain equalizing apparatus 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 mult... | 07/18/2000 |
| 6088383 | Spread-spectrum signal demodulator 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... | 07/11/2000 |
| 6084997 | Coupled waveguide structure 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.... | 07/04/2000 |
| 6052734 | Method and apparatus for dynamic data rate control over a packet-switched network 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 rece... | 04/18/2000 |
| 6025879 | System for moving object detection in moving picture 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... | 02/15/2000 |
| 6011587 | Packet video bitrate conversion system 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 i... | 01/04/2000 |
| 5978122 | Noise suppression method for wavelength division multiplexing transmission system 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 wavelengt... | 11/02/1999 |
| 5978529 | Gain equalizer and optical amplifying transmission line 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 le... | 11/02/1999 |
| 5969669 | Method for determining position of mobile earth station in satellite communication system 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... | 10/19/1999 |
| 5966228 | Optical transmission system and optical repeater 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 equalizi... | 10/12/1999 |
| 5960063 | Telephone speech recognition system 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)... | 09/28/1999 |
| 5952683 | Functional semiconductor element with avalanche multiplication 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 (T... | 09/14/1999 |
| 5940197 | Optical add-drop device 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... | 08/17/1999 |
| 5937126 | Optically amplifying/repeating transmission system and optical amplifier 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 μm, and an light receiving station connected ... | 08/10/1999 |
| 5930015 | Optical access system 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 sign... | 07/27/1999 |
| 5926300 | Optical add-drop multiplexer 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 i... | 07/20/1999 |
| 5912911 | Optical short pulse reshaping device 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, me... | 06/15/1999 |
