Patents by Inventor Nobukazu Koizumi
Nobukazu Koizumi has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 7423984Abstract: A digital subscriber line transmission (xDSL), system includes a transmitting side which transmits training symbols by adding some data that is contained in a training symbol sequence onto at least one of the beginning and the end of this symbol sequence and then transmits the training symbol sequence. A receiving side removes the data that has been added onto the training symbol sequence and executes training processing. The length of the training symbol sequence and of a transmit symbol sequence at time of normal communication is set in such a manner that the symbol sequence will not fall within an interval in which effects of near-end crosstalk from a neighboring line are received. The data added to the training symbol sequence specifies an interval in which effects of the crosstalk are received.Type: GrantFiled: June 23, 2005Date of Patent: September 9, 2008Assignee: Fujitsu LimitedInventors: Kazutomo Hasegawa, Hidetake Asahina, Seiji Miyoshi, Nobukazu Koizumi, Yutaka Awata
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Patent number: 7417792Abstract: An optical amplification device is disclosed that performs feedback control to maintain an amplification gain to be a constant based on measured power of input light and power of output light. The device includes a feedback control coefficient switching unit configured to, when performing the feedback control on a difference from an object amplification gain, distinguish a state of increasing or decreasing the number of frequencies of the input light and a steady state by making comparison and determination whether an amplitude of at least one of the power of the input light and the power of the output light is in a predetermined range, and switch the feedback control coefficient. Therefore, it is possible to reduce variation of the power of the output light caused by noise in the steady state without affecting operations of increasing and decreasing a number of frequencies of a light signal.Type: GrantFiled: March 15, 2005Date of Patent: August 26, 2008Assignee: Fujitsu LimitedInventors: Kazuhiko Hatae, Nobukazu Koizumi, Masato Oota
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Patent number: 7388711Abstract: An optical amplifier is provided with a controlling unit for controlling a gain of the optical amplifier based on input light power and output light power of the optical amplifier, as well as a gain control amount variable unit for changing the gain control amount of the optical amplifier by the controlling unit according to at least one of the input light power and the output light power. Thereby, optical communication, which can follow the change in the input power of the optical amplifier in high speed and also is stable, can be realized, without causing the occurrence of an oscillation phenomenon, the large size of the optical amplifier, and the increase in power consumption and heating.Type: GrantFiled: November 29, 2006Date of Patent: June 17, 2008Assignee: Fujitsu LimitedInventors: Masato Oota, Nobukazu Koizumi, Yohei Koganei
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Patent number: 7386037Abstract: A digital subscriber line communicating system having a central office and a remote terminal connected through a telephone line, the transmitting side including a sliding window transmitting unit for transmitting DMT symbols according to the sliding window through the telephone line to the receiving side, and the receiving side including a sliding window receiving unit for receiving DMT symbols according to the sliding window from the transmitting side, the sliding window indicating the phase of cross-talk condition due to a TCM-ISDN transmission at the receiving side, whereby TCM cross-talk can be reduced without largely departing from the standard system.Type: GrantFiled: November 12, 2004Date of Patent: June 10, 2008Assignee: Fujitsu LimitedInventors: Seiji Miyoshi, Yutaka Awata, Hiroyasu Murata, Nobukazu Koizumi, Takashi Sasaki
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Patent number: 7336627Abstract: A digital subscriber line transmission (xDSL) system includes a transmitting side which transmits training symbols by adding some data that is contained in a training symbol sequence onto at least one of the beginning and the end of this symbol sequence and then transmits the training symbol sequence. A receiving side removes the data that has been added onto the training symbol sequence and executes training processing. The length of the training symbol sequence and of a transmit symbol sequence at time of normal communication is set in such a manner that the symbol sequence will not fall within an interval in which effects of near-end crosstalk from a neighboring line are received. The data added to the training symbol sequence specifies an interval in which effects of the crosstalk are received.Type: GrantFiled: September 27, 2000Date of Patent: February 26, 2008Assignee: Fujitsu LimitedInventors: Kazutomo Hasegawa, Hidetake Asahina, Seiji Miyoshi, Nobukazu Koizumi, Yutaka Awata
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Patent number: 7303943Abstract: In a method of manufacturing an electric device, moisture in a film substrate is reduced by heating the film substrate at a temperature in the range of 80° C. to 100° C. Thereafter, an IC is mounted on the film substrate.Type: GrantFiled: October 7, 2004Date of Patent: December 4, 2007Assignees: Seiko Instruments Inc, Toray Advanced Film Co., Ltd., Maruwa CorporationInventors: Tsutomu Matsuhira, Hideaki Adachi, Keiichiro Hayashi, Tadahiro Nishigawa, Nobukazu Koizumi
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Patent number: 7295620Abstract: A digital subscriber line communicating system having a central office and a remote terminal connected through a telephone line, the transmitting side comprising a sliding window transmitting-unit for transmitting DMT symbols according to the sliding window through the telephone line to the receiving side, and the receiving side comprising a sliding window receiving unit for receiving DMT symbols according to the sliding window from the transmitting side, the sliding window indicating the phase of cross-talk condition due to a TCM-ISDN transmission at the receiving side, whereby TCM cross-talk can be reduced without largely departing from the standard system.Type: GrantFiled: August 13, 2004Date of Patent: November 13, 2007Assignee: Fujitsu LimitedInventors: Seiji Miyoshi, Yutaka Awata, Hiroyasu Murata, Nobukazu Koizumi, Takashi Sasaki
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Patent number: 7286495Abstract: A digital subscriber line transmission (xDSL)-, system includes a transmitting side which transmits training symbols by adding some data that is contained in a training symbol sequence onto at least one of the beginning and the end of this symbol sequence and then transmits the training symbol sequence. A receiving side removes the data that has been added onto the training symbol sequence and executes training processing. The length of the training symbol sequence and of a transmit symbol sequence at time of normal communication is set in such a manner that the symbol sequence will not fall within an interval in which effects of near-end crosstalk from a neighboring line are received. The data added to the training symbol sequence specifies an interval in which effects of the crosstalk are received.Type: GrantFiled: June 23, 2005Date of Patent: October 23, 2007Assignee: Fujitsu LimitedInventors: Kazutomo Hasegawa, Hidetake Asahina, Seiji Miyoshi, Nobukazu Koizumi, Yutaka Awata
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Publication number: 20070124129Abstract: The present invention provides a circuit evaluation method for evaluating a digital circuit which is mounted to, and operated in, a system apparatus, comprising: a first step for preparing first emulation logic which emulates an operation of the digital circuit; a second step for preparing second emulation logic which emulates an operation of an analog section through which passes a signal input to, and output from, the digital circuit in a state of being mounted to the system apparatus; and a third step for evaluating an operation of the digital circuit in a state of being mounted to the system apparatus by making the first and second emulation logic operate in a programmable logic circuit.Type: ApplicationFiled: February 17, 2006Publication date: May 31, 2007Applicant: FUJITSU LIMITEDInventors: Yasuo Ohtomo, Nobukazu Koizumi
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Publication number: 20070070492Abstract: An optical amplifier is provided with a controlling unit for controlling a gain of the optical amplifier based on input light power and output light power of the optical amplifier, as well as a gain control amount variable unit for changing the gain control amount of the optical amplifier by the controlling unit according to at least one of the input light power and the output light power. Thereby, optical communication, which can follow the change in the input power of the optical amplifier in high speed and also is stable, can be realized, without causing the occurrence of an oscillation phenomenon, the large size of the optical amplifier, and the increase in power consumption and heating.Type: ApplicationFiled: November 29, 2006Publication date: March 29, 2007Applicant: Fujitsu LimitedInventors: Masato Oota, Nobukazu Koizumi, Yohei Koganei
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Publication number: 20070038660Abstract: A design support apparatus is provided with a first managing part to manage design documents that become input information to design processes, an extracting part to extract at least one of specification undetermined items, inspecting items of results and caution items for design, from the design documents managed by the first managing part, and a display part to display a list of items extracted by the extracting part.Type: ApplicationFiled: November 18, 2005Publication date: February 15, 2007Applicant: FUJITSU LIMITEDInventors: Noriyasu Nakayama, Yutaka Awata, Nobukazu Koizumi
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Patent number: 7173984Abstract: A digital subscriber line communicating system having a central office and a remote terminal connected through a telephone line, the transmitting side including a sliding window transmitting unit for transmitting DMT symbols according to the sliding window through the telephone line to the receiving side, and the receiving side including a sliding window receiving unit for receiving DMT symbols according to the sliding window from the transmitting side, the sliding window indicating the phase of cross-talk condition due to a TCM-ISDN transmission at the receiving side, whereby TCM cross-talk can be reduced without largely departing from the standard system.Type: GrantFiled: August 13, 2004Date of Patent: February 6, 2007Assignee: Fujitsu LimitedInventors: Seiji Miyoshi, Yutaka Awata, Hiroyasu Murata, Nobukazu Koizumi, Takashi Sasaki
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Patent number: 7167509Abstract: A digital subscriber line communicating system for communicating between a transmitting side and a receiving side tough a communication line, the system including a hyperframe counter for periodically counting a predetermined number of continuous transmitting data symbols constituting a hyperframe synchronized with a timing signal, and a decoder for discriminating, based on the count value of the hyperframe counter, whether a transmitting data symbol belongs to a FEXTR, or a NEXTR. A sequencer is provided for initializing the status during an initialization period before starting usual communication. The initialization period includes an activation and acknowledgement sequence, a transceiver training sequence, a channel analysis sequence, and an exchange sequence. According to a single bitmap mode, the initialization is carried out by transmitting modulated symbols through only inside of the sliding window.Type: GrantFiled: March 2, 2005Date of Patent: January 23, 2007Assignee: Fujitsu LimitedInventors: Kazutomo Hasegawa, Seiji Miyoshi, Yutaka Awata, Takashi Sasaki, Nobukazu Koizumi
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Patent number: 7158290Abstract: An optical amplifier is provided with a controlling unit for controlling a gain of the optical amplifier based on input light power and output light power of the optical amplifier, as well as a gain control amount variable unit for changing the gain control amount of the optical amplifier by the controlling unit according to at least one of the input light power and the output light power. Thereby, optical communication, which can follow the change in the input power of the optical amplifier in high speed and also is stable, can be realized, without causing the occurrence of an oscillation phenomenon, the large size of the optical amplifier, and the increase in power consumption and heating.Type: GrantFiled: December 13, 2004Date of Patent: January 2, 2007Assignee: Fujitsu LimitedInventors: Masato Oota, Nobukazu Koizumi, Yohei Koganei
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Publication number: 20060257793Abstract: This printed wiring board manufacturing method comprises the steps of providing a large number of through holes (for a through-hole) in a substrate made of an insulating material of which both sides are coated with a copper foil; making the inside of the through holes electrically conductive, coating the substrate with a photosensitive dry film, and developing and hardening the photosensitive dry film as a plating resist; and copper-plating the inside of the through holes and the opening periphery thereof. The manufacturing method further comprises the steps of coating the copper-plated area with a metal protective film, eliminating the photosensitive dry film; forming a circuit pattern; and conducting an overlaying treatment as a post-processing step.Type: ApplicationFiled: December 27, 2005Publication date: November 16, 2006Applicant: Maruwa CorporationInventor: Nobukazu Koizumi
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Patent number: 7126995Abstract: A digital subscriber line communicating system having a central office and a remote terminal connected through a telephone line, the transmitting side having a sliding window transmitting unit for transmitting DMT symbols according to the sliding window trough the telephone line to the receiving side, and the receiving side having a sliding window receiving unit for receiving DMT symbols according to the sliding window from the transmitting side, the sliding window indicating the phase of cross-talk condition due to a TCM-ISDN transmission at the receiving side, whereby TCM cross-talk can be reduced without largely departing from the standard system.Type: GrantFiled: August 13, 2004Date of Patent: October 24, 2006Assignee: Fujitsu LimitedInventors: Seiji Miyoshi, Yutaka Awata, Hiroyasu Murata, Nobukazu Koizumi, Takashi Sasaki
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Patent number: 7088783Abstract: A digital subscriber line communicating system having a central office and a remote terminal connected through a telephone line, the transmitting side including a sliding window transmitting unit for transmitting DMT symbols according to the sliding window through the telephone line to the receiving side, and the receiving side including a sliding window receiving unit for receiving DMT symbols according to the sliding window from the transmitting side, the sliding window indicating the phase of cross-talk condition due to a TCM-ISDN transmission at the receiving side, whereby TCM cross-talk can be reducedType: GrantFiled: August 13, 2004Date of Patent: August 8, 2006Assignee: Fujitsu LimitedInventors: Seiji Miyoshi, Yutaka Awata, Hiroyasu Murata, Nobukazu Koizumi, Takashi Sasaki
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Patent number: 7072386Abstract: A digital subscriber line communicating system for communicating between a transmitting side and a receiving side through a communication line, comprising a hyperframe counter for periodically counting a predetermined number of continuous transmitting data symbols constituting a hyperframe synchronized with a timing signal, and a decoder for discriminating, based on the count value of the hyperframe counter, whether a transmitting data symbol belongs to a FEXTR or a NEXTR. A sequencer is provided for initializing the status during an initialization period before starting usual communication. The initialization period includes an activation and acknowledgement sequence, a transceiver training sequence, a channel analysis sequence, and an exchange sequence. According to a single bitmap mode, the initialization is carried out by transmitting modulated symbols through only inside of said sliding window.Type: GrantFiled: June 18, 1999Date of Patent: July 4, 2006Assignee: Fujitsu LimitedInventors: Kazutomo Hasegawa, Seiji Miyoshi, Yutaka Awata, Takashi Sasaki, Nobukazu Koizumi
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Publication number: 20060079026Abstract: A method of manufacture is provided in which position deviations during mounting are eliminated, and in which fine connections on the order of a 30 ?m pitch can be stabilized. A low cost device can thus be realized by cost reductions that accompany smaller ICs. Mounting is performed in a state where moisture in a polyimide film of a film substrate has been substantially dried, or mounting is performed after conditioning under a fixed environment. Further, patterning of the film substrate is performed after similar drying processing or conditioning.Type: ApplicationFiled: October 7, 2004Publication date: April 13, 2006Inventors: Tsutomu Matsuhira, Hideaki Adachi, Keiichiro Hayashi, Tadahiro Nishigawa, Nobukazu Koizumi
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Patent number: 7024442Abstract: A processing apparatus includes a memory capable of storing data, a butterfly arithmetic unit for performing butterfly computation processes, and a bit-reversed order shuffle processing unit for writing results obtained by butterfly computation processes performed by the butterfly arithmetic unit at addresses in the memory after bit-reversed order shuffle instead of writing the results at addresses in the memory in processing order. The data written by the bit-reversed order shuffle processing unit are discrete fast Fourier transform results.Type: GrantFiled: November 20, 2001Date of Patent: April 4, 2006Assignee: Fujitsu LimitedInventors: Yoshinobu Yamamoto, Nobukazu Koizumi, Atsushi Sakurai