Patents by Inventor Nobuyoshi Ukaji

Nobuyoshi Ukaji 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).

  • Automatic gain control circuit
    Patent number: 7557866
    Abstract: An AGC control section (110) has a first operation mode for controlling the gain of a variable gain amplifier (103) to maintain the amplitude of the sync signal measured by a sync signal amplitude measuring circuit (108) at a constant value, and a second operation mode for preventing the gain from being increased even when the amplitude of the sync signal measured by the video signal processing circuit (109) is smaller than the predetermined first reference value and reducing the gain of the variable gain amplifier (103) only when the amplitude of the video signal exceeds a predetermined second reference value. During operation in the first operation mode, when the amplitude of the sync signal is smaller than the predetermined first reference value and the amplitude of the video signal is greater than the predetermined second reference value, the mode is switched to the second operation mode.
    Type: Grant
    Filed: April 6, 2004
    Date of Patent: July 7, 2009
    Assignee: Asahi Kasei EMD Corporation
    Inventors: Hideaki Sasahara, Nobuyoshi Ukaji, Ken Ishihara
  • Automatic gain control circuit
    Publication number: 20060203128
    Abstract: An AGC control section (110) has a first operation mode for controlling the gain of a variable gain amplifier (103) to maintain the amplitude of the sync signal measured by a sync signal amplitude measuring circuit (108) at a constant value, and a second operation mode for preventing the gain from being increased even when the amplitude of the sync signal measured by the video signal processing circuit (109) is smaller than the predetermined first reference value and reducing the gain of the variable gain amplifier (103) only when the amplitude of the video signal exceeds a predetermined second reference value. During operation in the first operation mode, when the amplitude of the sync signal is smaller than the predetermined first reference value and the amplitude of the video signal is greater than the predetermined second reference value, the mode is switched to the second operation mode.
    Type: Application
    Filed: April 6, 2004
    Publication date: September 14, 2006
    Inventors: Hideaki Sasahara, Nobuyoshi Ukaji, Ken Ishihara