Patents by Inventor Ho Yiu MAK

Ho Yiu MAK 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).

  • Publication number: 20240185822
    Abstract: The ultra-low frequency acoustic absorber (10) includes a hollow housing (12) having opposed first and second open ends (22, 24), and a plurality of metallic mesh layers (16) stacked within the housing (12). In order to secure the plurality of metallic mesh layers (16) within the hollow housing (12), first and second mesh covers (18, 20) may cover the first and second open ends (22, 24) of the hollow housing (12), respectively. At least one spacer (14) may be provided to form a gap between the housing (12) and a support surface, such as a hard wall (W) or the like. The at least one spacer (14) may have a length sufficient to space the ultra-low frequency acoustic absorber (10) at the position of optimal absorption based on an acoustic soft 10 boundary condition (ASBC).
    Type: Application
    Filed: April 21, 2022
    Publication date: June 6, 2024
    Inventors: Ping SHENG, Ho Yiu MAK, Xiaonan ZHANG, Zhen DONG
  • Patent number: 11905703
    Abstract: A soft boundary structure is implemented using a resonator structure capable of receiving sound or vibration, establishing resonance coupled with received sound or vibration, and creating a reflection with a pi phase factor. A soft boundary is located on or closely adjacent the resonator structure. The soft boundary cooperates with the resonator structure to attenuate the sound or vibration.
    Type: Grant
    Filed: December 23, 2019
    Date of Patent: February 20, 2024
    Assignee: THE HONG KONG UNIVERSITY OF SCIENCE AND TECHNOLOGY
    Inventors: Ping Sheng, Ho Yiu Mak, Xiaonan Zhang, Zhen Dong
  • Publication number: 20210381231
    Abstract: A soft boundary structure is implemented using a resonator structure capable of receiving sound or vibration, establishing resonance coupled with received sound or vibration, and creating a reflection with a pi phase factor. A soft boundary is located on or closely adjacent the resonator structure. The soft boundary cooperates with the resonator structure to attenuate the sound or vibration.
    Type: Application
    Filed: December 23, 2019
    Publication date: December 9, 2021
    Inventors: Ping SHENG, Ho Yiu MAK, Xiaonan ZHANG, Zhen DONG
  • Patent number: 10991358
    Abstract: An active sound barrier has at least one passive sound absorber at or near a boundary location. A microphone provides an output to a frequency division module, in which a plural of frequencies are filtered to provide outputs corresponding to frequency segments of the receiving transducer output at respective ones of the frequencies. An active driving circuit drives plural speakers or output transducers at respective ones of the frequencies, with at least a subset of the speakers or output transducers at or close to the barrier. The speakers or output transducers cooperate with the passive sound absorber to reduce noise across a wide frequency band as well as to effect an electrically switchable soft boundary.
    Type: Grant
    Filed: December 31, 2019
    Date of Patent: April 27, 2021
    Assignees: THE HONG KONG UNIVERSITY OF SCIENCE AND TECHNOLOGY, HONG KONG BAPTIST UNIVERSITY
    Inventors: Ping Sheng, Zhen Dong, Xiaonan Zhang, Jie Pan, Ho Yiu Mak, Guancong Ma
  • Publication number: 20200211527
    Abstract: An active sound barrier has at least one passive sound absorber at or near a boundary location. A microphone provides an output to a frequency division module, in which a plural of frequencies are filtered to provide outputs corresponding to frequency segments of the receiving transducer output at respective ones of the frequencies. An active driving circuit drives plural speakers or output transducers at respective ones of the frequencies, with at least a subset of the speakers or output transducers at or close to the barrier. The speakers or output transducers cooperate with the passive sound absorber to reduce noise across a wide frequency band as well as to effect an electrically switchable soft boundary.
    Type: Application
    Filed: December 31, 2019
    Publication date: July 2, 2020
    Inventors: Ping SHENG, Zhen DONG, Xiaonan ZHANG, Jie PAN, Ho Yiu MAK, Guancong MA