Patents by Inventor Alexios Alexandropoulos

Alexios Alexandropoulos 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).

  • Laser diode current driving apparatus
    Patent number: 11196229
    Abstract: A driver circuit for a laser diode is configured to pass a current. The circuit includes a charge-pump configured to generate an output boosted positive supply rail voltage. At least one switch is configured to couple the output of the charge-pump to a terminal of the laser diode and to isolate the positive supply rail from the terminal of the laser diode when the charge-pump is enabled.
    Type: Grant
    Filed: June 13, 2019
    Date of Patent: December 7, 2021
    Assignee: STMICROELECTRONICS (RESEARCH & DEVELOPMENT) LIMITED
    Inventors: Denise Lee, Graeme Storm, Aravind Venugopalan Nair Jalajakumari, Alexios Alexandropoulos
  • SINGLE-PHOTON AVALANCHE DIODE-BASED LIGHT COMMUNICATION DEVICES
    Publication number: 20210126708
    Abstract: A method of processing a visible light communication (VLC) signal using a single-photon avalanche diode (SPAD) includes detecting photons of a VLC signal at a SPAD detector, counting the photons detected by the SPAD detector to generate a combined VLC signal comprising a data signal and an ambient signal, extracting the ambient signal from the combined VLC signal, subtracting the ambient signal from the combined VLC signal to generate the data signal, and outputting the data signal as a bitstream.
    Type: Application
    Filed: December 30, 2019
    Publication date: April 29, 2021
    Inventors: Ellen Couper, Neale Dutton, Alexios Alexandropoulos
  • Single-photon avalanche diode-based light communication devices
    Patent number: 10992384
    Abstract: A method of processing a visible light communication (VLC) signal using a single-photon avalanche diode (SPAD) includes detecting photons of a VLC signal at a SPAD detector, counting the photons detected by the SPAD detector to generate a combined VLC signal comprising a data signal and an ambient signal, extracting the ambient signal from the combined VLC signal, subtracting the ambient signal from the combined VLC signal to generate the data signal, and outputting the data signal as a bitstream.
    Type: Grant
    Filed: December 30, 2019
    Date of Patent: April 27, 2021
    Assignee: STMICROELECTRONICS (RESEARCH & DEVELOPMENT) LIMITED
    Inventors: Ellen Couper, Neale Dutton, Alexios Alexandropoulos
  • LASER DIODE CURRENT DRIVING APPARATUS
    Publication number: 20190393674
    Abstract: A driver circuit for a laser diode is configured to pass a current. The circuit includes a charge-pump configured to generate an output boosted positive supply rail voltage. At least one switch is configured to couple the output of the charge-pump to a terminal of the laser diode and to isolate the positive supply rail from the terminal of the laser diode when the charge-pump is enabled.
    Type: Application
    Filed: June 13, 2019
    Publication date: December 26, 2019
    Inventors: Denise Lee, Graeme Storm, Aravind Venugopalan Nair Jalajakumari, Alexios Alexandropoulos
  • Directional speaker system and method
    Patent number: 10284994
    Abstract: A directional loudspeaker system has a loudspeaker arrangement configured to generate N audio signals. A time-of-flight sensor arrangement is configured to detect a location of a user. A controller is configured to use information from the time-of-flight sensor arrangement about the location of the user to control the delay such that the N audio signals constructively interfere at the location of the user.
    Type: Grant
    Filed: March 24, 2017
    Date of Patent: May 7, 2019
    Assignee: STMICROELECTRONICS (RESEARCH & DEVELOPMENT) LIMITED
    Inventor: Alexios Alexandropoulos
  • DIRECTIONAL SPEAKER SYSTEM AND METHOD
    Publication number: 20180091916
    Abstract: A directional loudspeaker system has a loudspeaker arrangement configured to generate N audio signals. A time-of-flight sensor arrangement is configured to detect a location of a user. A controller is configured to use information from the time-of-flight sensor arrangement about the location of the user to control the delay such that the N audio signals constructively interfere at the location of the user.
    Type: Application
    Filed: March 24, 2017
    Publication date: March 29, 2018
    Inventor: Alexios Alexandropoulos