Patents by Inventor Yuling Khang

Yuling Khang 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).

  • Circuits and methods for reducing pop noise in class D amplifiers
    Patent number: 8265303
    Abstract: In one embodiment the present invention includes a method for starting up a class D amplifier. The method comprises increasing, gating, and driving. The increasing includes increasing a duty cycle of a pulse train from a first duty cycle to a second duty cycle. The gating includes gating a signal based on the increasing of the duty cycle. The gating results in a gated signal. The driving includes driving an output signal from the gated signal to charge an output capacitor. The output capacitor is coupled to a speaker. The increasing of the duty cycle contributes to the charging of the output capacitor such that switching sounds detectable by the human ear are reduced.
    Type: Grant
    Filed: March 11, 2009
    Date of Patent: September 11, 2012
    Assignee: PacificTech Microelectronics, Inc.
    Inventors: Hongbo Zhang, Vincent Fong, Jing Xu, Yuling Khang
  • Circuits and Methods for Reducing Pop Noise in Class D Amplifiers
    Publication number: 20100232628
    Abstract: In one embodiment the present invention includes a method for starting up a class D amplifier. The method comprises increasing, gating, and driving. The increasing includes increasing a duty cycle of a pulse train from a first duty cycle to a second duty cycle. The gating includes gating a signal based on the increasing of the duty cycle. The gating results in a gated signal. The driving includes driving an output signal from the gated signal to charge an output capacitor. The output capacitor is coupled to a speaker. The increasing of the duty cycle contributes to the charging of the output capacitor such that switching sounds detectable by the human ear are reduced.
    Type: Application
    Filed: March 11, 2009
    Publication date: September 16, 2010
    Applicant: PacificTech Microelectronics, Inc.
    Inventors: Hongbo Zhang, Vincent Fong, Jing Xu, Yuling Khang