Patents by Inventor Yasutoshi Hirano

Yasutoshi Hirano 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: 7777554
    Abstract: A temperature detector includes a plurality of temperature sensors each configured to generate a voltage signal in accordance with sensed temperature and output the voltage signal, a plurality of storage circuits corresponding to the respective temperature sensors and each configured to store a signal level input to the storage circuit and output the stored signal level in response to a control signal, and a control circuit configured to exclusively select one of the voltage signals output from the respective temperature sensors, compare the selected voltage signal with a predetermined reference voltage, and store the selected voltage signal into the corresponding storage circuit sequentially in response to the control signal.
    Type: Grant
    Filed: July 6, 2007
    Date of Patent: August 17, 2010
    Assignee: Ricoh Company, Ltd.
    Inventor: Yasutoshi Hirano
  • Publication number: 20080049811
    Abstract: A temperature detector includes a plurality of temperature sensors each configured to generate a voltage signal in accordance with sensed temperature and output the voltage signal, a plurality of storage circuits corresponding to the respective temperature sensors and each configured to store a signal level input to the storage circuit and output the stored signal level in response to a control signal, and a control circuit configured to exclusively select one of the voltage signals output from the respective temperature sensors, compare the selected voltage signal with a predetermined reference voltage, and store the selected voltage signal into the corresponding storage circuit sequentially in response to the control signal.
    Type: Application
    Filed: July 6, 2007
    Publication date: February 28, 2008
    Inventor: Yasutoshi Hirano
  • Patent number: 6970984
    Abstract: A signal processing apparatus includes a digital signal processor (DSP) including an internal memory part storing a program to carry out, an external memory part storing all programs to carry out in the DSP, a clock signal generating part for generating and outputting a clock signal to the DSP, and a clock signal control part for controlling to output said clock signal to the DSP. More particularly, the clock signal control part forwards the programs outputted from the external memory part to the internal memory after the clock signal generating part stops outputting the clock signal to the DSP.
    Type: Grant
    Filed: September 19, 2001
    Date of Patent: November 29, 2005
    Assignee: Ricoh Company, Ltd.
    Inventor: Yasutoshi Hirano
  • Publication number: 20020038409
    Abstract: A signal processing apparatus includes a digital signal processor (DSP) including an internal memory part storing a program to carry out, an external memory part storing all programs to carry out in the DSP, a clock signal generating part for generating and outputting a clock signal to the DSP, and a clock signal control part for controlling to output said clock signal to the DSP. More particularly, the clock signal control part forwards the programs outputted from the external memory part to the internal memory after the clock signal generating part stops outputting the clock signal to the DSP.
    Type: Application
    Filed: September 19, 2001
    Publication date: March 28, 2002
    Applicant: Ricoh Company, Ltd.
    Inventor: Yasutoshi Hirano
  • Patent number: 5831687
    Abstract: In a color video signal processing method, color difference component signals are converted into RGB component signals by a digital to digital conversion so as to reduce a size of a processing unit used for the conversion. An analog composite signal is converted into analog color difference component signals. The analog color difference component signals are then converted into digital color difference component signals. The digital color difference component signals are converted into digital RGB component signals by a digital to digital conversion based on an approximation method. Finally, the digital RGB component signals are converted into analog RGB component signals. The digital-to-digital conversion may be performed in accordance with equations in which each factor is a fractional number having a denominator of a power of 2.
    Type: Grant
    Filed: August 22, 1996
    Date of Patent: November 3, 1998
    Assignee: Ricoh Company, Ltd.
    Inventors: Yasutoshi Hirano, Takashi Michiyoshi