Patents by Inventor Yoshifumi SHIRAKI

Yoshifumi SHIRAKI 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).

  • SOUND MEASUREMENT METHOD
    Publication number: 20230288247
    Abstract: An optical phase modulation amount measurement technology using sound without being affected by noise included in an average light intensity is provided.
    Type: Application
    Filed: July 28, 2020
    Publication date: September 14, 2023
    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Kenji ISHIKAWA, Yoshifumi SHIRAKI, Takehiro MORIYA, Kenichi HITACHI, Atsushi ISHIZAWA, Katsuya OGURI
  • Receiving apparatus, receiving method, and program
    Patent number: 11228369
    Abstract: A sampling frequency required for symbol timing recovery is made smaller than that of the related art. A receiver 1 performs visible light communication with a transmitter 8. A received signal generating unit 112 measures an intensity of an electrical signal corresponding to an optical signal received from a transmitter 8 at a predetermined time interval to generate a sequence of received signals. A parameter estimation unit 12 uses a distribution of received signals estimated from the sequence of received signals to estimate any one or more parameters of a maximum luminance value, a synchronization shift, and a steady noise level, the one or more parameters including at least the maximum luminance value.
    Type: Grant
    Filed: August 8, 2019
    Date of Patent: January 18, 2022
    Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Yoshifumi Shiraki, Takehiro Moriya, Yutaka Kamamoto, Takashi Sato
  • RECEIVING APPARATUS, RECEIVING METHOD, AND PROGRAM
    Publication number: 20210306070
    Abstract: A sampling frequency required for symbol timing recovery is made smaller than that of the related art. A receiver 1 performs visible light communication with a transmitter 8. A received signal generating unit 112 measures an intensity of an electrical signal corresponding to an optical signal received from a transmitter 8 at a predetermined time interval to generate a sequence of received signals. A parameter estimation unit 12 uses a distribution of received signals estimated from the sequence of received signals to estimate any one or more parameters of a maximum luminance value, a synchronization shift, and a steady noise level, the one or more parameters including at least the maximum luminance value.
    Type: Application
    Filed: August 8, 2019
    Publication date: September 30, 2021
    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Yoshifumi SHIRAKI, Takehiro MORIYA, Yutaka KAMAMOTO, Takashi SATO