Patents by Inventor Eizo Katayama

Eizo Katayama 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).

  • Modulator and demodulator (MODEM)
    Patent number: 7006261
    Abstract: A MODEM can shorten the processing time of an interface disposed between a data terminal equipment (DTE) and the MODEM. The MODEM stores an object program of a procedure in a memory and switches an operational mode of the MODEM automatically corresponding to the prescribed procedure thereby executing the procedure corresponding to the current operational mode. The MODEM further comprises a timer which monitors the transits time between a completed procedure and the next procedure, and the MODEM starts the process of a specified operational mode based on a mode-setting-instruction of the procedure as well as monitoring the transitions time by using the timer, and executing a next specified operational mode when the timer times out, thereby allowing the MODEM to perform the various operational mode switches.
    Type: Grant
    Filed: December 10, 1999
    Date of Patent: February 28, 2006
    Assignee: Panasonic Communications Co., Ltd.
    Inventors: Mikio Mizutani, Nobuhiko Noma, Eizo Katayama, Genzo Takagi, Yoshihiro Noguchi, Mitsuhiro Araki
  • Modulator and demodulator (MODEM)
    Patent number: 6038252
    Abstract: A MODEM can shorten the processing time of an interface disposed between a data terminal equipment (DTE) and the MODEM. The MODEM stores an object program of a procedure in a memory and switches an operational mode of the MODEM automatically corresponding to the prescribed procedure thereby executing the procedure corresponding to the current operational mode. The MODEM further comprises a timer which monitors the transits time between a completed procedure and the next procedure, and the MODEM starts the process of a specified operational mode based on a mode-setting-instruction of the procedure as well as monitoring the transitions time by using the timer, and executing a next specified operational mode when the timer times out, thereby allowing the MODEM to perform the various operational mode switches.
    Type: Grant
    Filed: June 30, 1998
    Date of Patent: March 14, 2000
    Assignee: Matsushita Graphic Communication Systems, Inc.
    Inventors: Mikio Mizutani, Nobuhiko Noma, Eizo Katayama, Genzo Takagi, Yoshihiko Noguchi, Mitsuhiro Araki
  • Modulator and demodulator (MODEM)
    Patent number: 5946348
    Abstract: A MODEM can shorten the processing time of an interface disposed between a data terminal equipment (DTE) and the MODEM. The MODEM stores an object program of a procedure in a memory and switches an operational mode of the MODEM automatically corresponding to the prescribed procedure thereby executing the procedure corresponding to the current operational mode. The MODEM further comprises a timer which monitors the transits time between a completed procedure and the next procedure, and the MODEM starts the process of a specified operational mode based on a mode-setting-instruction of the procedure as well as monitoring the transitions time by using the timer, and executing a next specified operational mode when the timer times out, thereby allowing the MODEM to perform the various operational mode switches.
    Type: Grant
    Filed: June 13, 1996
    Date of Patent: August 31, 1999
    Assignee: Matsushita Graphic Communication Systems, Inc.
    Inventors: Mikio Mizutani, Nobuhiko Noma, Eizo Katayama, Genzo Takagi, Yoshihiko Noguchi, Mitsuhiro Araki
  • Digital signal detection circuit
    Patent number: 5661709
    Abstract: A digital signal detection circuit includes a threshold value calculator calculating a threshold value from assumptive sampled values corresponding to various data patterns of a regenerated signal. The regenerated signal is obtained by regenerating data recorded on a recording medium by a regenerating head. The detection circuit also includes a Viterbi decoder carrying out Viterbi decoding of the regenerated signal with the threshold value determined by the threshold value calculator as a constant. The threshold value calculator variably controls the threshold value using a decoded output of the Viterbi decoder and a regenerated signal corresponding to the decoded output of the Viterbi decoder.
    Type: Grant
    Filed: July 30, 1996
    Date of Patent: August 26, 1997
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Genzo Takagi, Yoshihiro Noguchi, Eizo Katayama, Mitsuhiro Araki, Yoshinori Takahashi
  • Method for recording data on non-defective sectors of an optical disk
    Patent number: 4839879
    Abstract: An optical disc is subdivided into a plurality of concentric tracks. The tracks are further subdivided into a plurality of sectors. A method for recording data on such an optical disc includes the steps of designating some of the sectors as preliminary sectors and the remaining sectors as user sectors, identifying defective user sectors, and recording data corresponding to the defective sectors on the preliminary sectors.
    Type: Grant
    Filed: August 27, 1987
    Date of Patent: June 13, 1989
    Assignee: Matsushita Graphic Communication Systems, Inc.
    Inventors: Kaname Sawada, Kazuo Suzuki, Shinji Hasunuma, Eizo Katayama, Motoyasu Ohno, Tsukasa Kanazawa, Keiji Ueki
  • Door alarm controlled by operation of door lock
    Patent number: 4035791
    Abstract: A burglar alarm device comprises a door lock fixed on a door, a switch closed by a locking operation of the door lock, a door switch closed by an opening operation of the door, an electric circuit which retains an energized state caused by a closing operation of the door switch when the first-mentioned switch is closed and an alarm controlled by the electric circuit.
    Type: Grant
    Filed: May 16, 1975
    Date of Patent: July 12, 1977
    Inventor: Eizo Katayama