Patents by Inventor Yoshiyuki Hirahata

Yoshiyuki Hirahata 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).

  • Collective housing intercom system
    Patent number: 7792259
    Abstract: Irrespective of the distance of a line through which a video signal is taken by the camera of a main entrance station, a satisfactory image having not deterioration but excellent visibility is displayed in a monitor of a residential master station. A distance decision unit of a residential master station for displaying a video signal taken by a camera of an main entrance station in a monitor decides the distance of the line length of a master station line in terms of the voltage drop of the DC power supply fed from a controller to the residential master station. A level compensation unit of the residential master station compensates the level of the video signal in accordance with the decided distance. A distance decision unit of the main entrance station decides the distance of the line length of an entrance line in terms of the voltage drop of the DC power supply fed from the controller to the main entrance station.
    Type: Grant
    Filed: August 16, 2006
    Date of Patent: September 7, 2010
    Assignee: Aiphone Co., Ltd.
    Inventors: Seiya Yamakawa, Yoshiyuki Hirahata
  • Collective housing intercom system
    Publication number: 20070189483
    Abstract: Irrespective of the distance of a line through which a video signal is taken by the camera of a main entrance station, a satisfactory image having not deterioration but excellent visibility is displayed in a monitor of a residential master station. A distance decision unit of a residential master station for displaying a video signal taken by a camera of an main entrance station in a monitor decides the distance of the line length of a master station line in terms of the voltage drop of the DC power supply fed from a controller to the residential master station. A level compensation unit of the residential master station compensates the level of the video signal in accordance with the decided distance. A distance decision unit of the main entrance station decides the distance of the line length of an entrance line in terms of the voltage drop of the DC power supply fed from the controller to the main entrance station.
    Type: Application
    Filed: August 16, 2006
    Publication date: August 16, 2007
    Applicant: Aiphone Co., Ltd.
    Inventors: Seiya Yamakawa, Yoshiyuki Hirahata