Patents by Inventor Hisayuki Maruyama

Hisayuki Maruyama 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).

  • Patent number: 5706422
    Abstract: A plurality of different fault locating functions are provided in a communication system comprising a plurality of terminals connected to a data transmission channel. The functions are at different levels, respectively, ranging from a level for rapid fault location to a level for reliable and sure fault location. Upon detection of an occurrence of a fault, one fault locating function is performed. If the fault is not located accurately located, another fault locating function of a level for more reliable is performed, thus the functions are performed sequentially in the order from the level for rapid location to the level for more deliberate and reliable location. Preferably, the channel is reconfigured to avoid the fault, according to the fault located by the functions of the respective levels. With this arrangement, a fault which does most possibly occur can be located quickly, while another fault difficult to locate can be located accurately.
    Type: Grant
    Filed: July 16, 1996
    Date of Patent: January 6, 1998
    Assignees: Hitachi Ltd., Hitachi Process Computer Engineering, Inc.
    Inventors: Hisayuki Maruyama, Jushi Ide, Seiichi Yasumoto, Sadao Mizokawa, Ken Onuki, Toshio Ishihara, Masato Satake, Toshihiko Uchiyama
  • Patent number: 5497374
    Abstract: A data transmission method and system of a token passing type capable of periodically transmitting cyclic data produced in a station to other stations while enabling a packet data communication with high efficiency and without disturbing the periodicity of the cyclic communication. A token circulation time is set to be shorter than a cycle time for production of the cyclic data where no packet data to be transmitted. Also each station will pass an acquired token immediately to the next station if the station has no data to be transmitted. Thus, at least one station can have a token at least two times during the cycle time to transmit the cyclic data and the packet data. Upper limits may be set to capacities of the cyclic data and the packet data which are capable of being transmitted each time the token is acquired.
    Type: Grant
    Filed: September 2, 1994
    Date of Patent: March 5, 1996
    Assignees: Hitachi, Ltd., Hitachi Process Computer Engineering, Inc.
    Inventors: Hisayuki Maruyama, Sadao Mizokawa, Seiichi Yasumoto, Ken Onuki, Hisao Ogawa, Junji Fukuzawa, Toshihiko Uchiyama, Toshiyuki Murakami, Osamu Anbo, Masato Satake
  • Patent number: 5426638
    Abstract: A data transmission method and system of a token passing type capable of periodically transmitting cyclic data produced in a station to other stations while enabling a packet data communication with high efficiency and without disturbing the periodicity of the cyclic communication. A token circulation time is set to be shorter than a cycle time for production of the cyclic data where no packet data is to be transmitted. Also each station will pass an acquired token immediately to the next station if the station has no data to be transmitted. Thus, at least one station can receives a token at least two times during the cycle time to transmit the cyclic data and the packet data. Upper limits may be set to capacities of the cyclic data and the packet data which are capable of being transmitted each time the token is acquired.
    Type: Grant
    Filed: March 19, 1990
    Date of Patent: June 20, 1995
    Assignees: Hitachi, Ltd., Hitachi Process Computer Engineering, Inc.
    Inventors: Hisayuki Maruyama, Sadao Mizokawa, Seiichi Yasumoto, Ken Onuki, Hisao Ogawa, Junji Fukuzawa, Toshihiko Uchiyama, Toshiyuki Murakami, Osamu Anbo, Masato Satake
  • Patent number: 5414739
    Abstract: A transmission system which includes a plurality of reproduction nodes connected to each other in a cascade connection via a communication line. Each node includes a timing extraction circuit for extracting a timing signal from a signal received via the communication line, a discriminating circuit for converting the received signal into a digital signal according to the timing signal, and a processing circuit for processing, based on the timing signal, the digital signal outputted from the discriminating circuit and outputting the processed digital signal to the communication line. The timing extraction circuit includes a signal delay unit for supplying the timing signal with a signal delay time greater than a delay time occurring in the processing circuit.
    Type: Grant
    Filed: November 12, 1992
    Date of Patent: May 9, 1995
    Assignees: Hitachi, Ltd., Hitachi Cable, Ltd.
    Inventors: Naoya Kobayashi, Yoshitaka Takasaki, Sadao Mizokawa, Hisayuki Maruyama, Hiroshi Mabuchi, Eiichi Amada
  • Patent number: 5210632
    Abstract: A signal transmission system comprising an apparatus which inhibits the repeating in the opposite direction during reception and transmission of frames and which monitors the number of frames which were outputted in one direction from a repeater and the number of frames which were returned from such direction, whereby a destruction and circulation of the frame are inhibited without reducing response speed of a signal.
    Type: Grant
    Filed: May 22, 1990
    Date of Patent: May 11, 1993
    Assignees: Hitachi, Ltd., Hitachi Cable Ltd., Hitachi Process Computer Engineering, Inc.
    Inventors: Toshiyuki Murakami, Sadao Mizokawa, Hisayuki Maruyama, Masato Satake, Masanori Kogawa, Naomasa Hanano