Patents by Inventor Xi Chun Ma

Xi Chun Ma 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).

  • Active noise cancelling device and method of actively cancelling acoustic noise
    Patent number: 10325584
    Abstract: An active noise cancelling device including a sensor configured to convert acoustic signals into first audio signals and a speaker acoustically coupled to the sensor A control stage is configured to control the speaker based on the first audio signals to cause the speaker to produce cancelling acoustic waves that tend to suppress acoustic noise components in the acoustic signals. The control stage includes sigma-delta modulator digital filters.
    Type: Grant
    Filed: September 23, 2015
    Date of Patent: June 18, 2019
    Assignees: STMicroelectronics S.r.l., STMicroelectronics (Shenzhen) R&D Co. Ltd
    Inventors: Luca Molinari, Xi Chun Ma, Sandro Dalle Feste, Martino Zerbini
  • ACTIVE NOISE CANCELLING DEVICE AND METHOD OF ACTIVELY CANCELLING ACOUSTIC NOISE
    Publication number: 20160171966
    Abstract: An active noise cancelling device including a sensor configured to convert acoustic signals into first audio signals and a speaker acoustically coupled to the sensor A control stage is configured to control the speaker based on the first audio signals to cause the speaker to produce cancelling acoustic waves that tend to suppress acoustic noise components in the acoustic signals. The control stage includes sigma-delta modulator digital filters.
    Type: Application
    Filed: September 23, 2015
    Publication date: June 16, 2016
    Inventors: Luca Molinari, Xi Chun Ma, Sandro Dalle Feste, Martino Zerbini