Patents by Inventor Kwok-Leung Chan

Kwok-Leung Chan 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).

  • Patent number: 10892583
    Abstract: An expandable and upgradeable universal socket, including a socket body and a function module. The function module is replaceable and upgradeable, and is detachably fixed to the socket body. A power circuit of the function module is separably connected to a power circuit of the socket body to enable the function modules to plug and play. A space is provided in the socket body to accommodate the functional module, and a surface of the socket body is provided with a function area corresponding to the function module. Various expanded function modules can be matched and arranged in the reserved space. Small electronic components can be accommodated in the socket bottom box, and the number of external power transformers are reduced, which saves space, reduces exposed wires and beautifies the appearance. There is no need to replace the entire socket when upgrading the socket, which is environmentally friendly and energy saving.
    Type: Grant
    Filed: September 10, 2019
    Date of Patent: January 12, 2021
    Inventor: Kwok Leung Chan
  • Patent number: 8898056
    Abstract: The present invention relates to blind source separation. More specifically certain embodiments relate to the blind source separation using frequency domain processes. Aspects of the invention relate to methods and systems for receiving a set of frequency-domain first signals, and then separating the set of frequency-domain first signals into a set of frequency-domain second signals. The frequency-domain second signals may have a set of separated frequency-domain second signal elements corresponding to individual frequencies wherein each frequency-domain second signal element is assigned an identifier. The identifier may indicate which of the set of frequency-domain second signals includes the frequency-domain second signal element. Some aspects also include reordering the identifiers corresponding to at least one frequency to improve coherence of the frequency-domain second signals and to produce a set of frequency-domain third signals.
    Type: Grant
    Filed: February 27, 2007
    Date of Patent: November 25, 2014
    Assignee: QUALCOMM Incorporated
    Inventors: Kwok-Leung Chan, Erik Visser
  • Patent number: 8175291
    Abstract: Systems, methods, and apparatus for processing an M-channel input signal are described that include outputting a signal produced by a selected one among a plurality of spatial separation filters. Applications to separating an acoustic signal from a noisy environment are described, and configurations that may be implemented on a multi-microphone handheld device are also described.
    Type: Grant
    Filed: December 12, 2008
    Date of Patent: May 8, 2012
    Assignee: QUALCOMM Incorporated
    Inventors: Kwok-Leung Chan, Erik Visser, Hyun Jin Park, Jeremy Toman
  • Publication number: 20090254338
    Abstract: The present invention relates to blind source separation. More specifically it relates to the blind source separation using frequency domain processes.
    Type: Application
    Filed: February 27, 2007
    Publication date: October 8, 2009
    Applicant: QUALCOMM Incorporated
    Inventors: Kwok-Leung Chan, Erik Visser
  • Publication number: 20090164212
    Abstract: Systems, methods, and apparatus for processing an M-channel input signal are described that include outputting a signal produced by a selected one among a plurality of spatial separation filters. Applications to separating an acoustic signal from a noisy environment are described, and configurations that may be implemented on a multi-microphone handheld device are also described.
    Type: Application
    Filed: December 12, 2008
    Publication date: June 25, 2009
    Applicant: QUALCOMM Incorporated
    Inventors: Kwok-Leung Chan, Erik Visser, Hyun Jin Park, Jeremy Toman
  • Publication number: 20080208538
    Abstract: Methods, apparatus, and systems for source separation include a converged plurality of coefficient values that is based on each of a plurality of M-channel signals. Each of the plurality of M-channel signals is based on signals produced by M transducers in response to at least one information source and at least one interference source. In some examples, the converged plurality of coefficient values is used to filter an M-channel signal to produce an information output signal and an interference output signal.
    Type: Application
    Filed: February 26, 2008
    Publication date: August 28, 2008
    Applicant: QUALCOMM INCORPORATED
    Inventors: Erik Visser, Kwok-Leung Chan, Hyun-Jin Park
  • Patent number: 4747128
    Abstract: This invention is a telephone privacy protector to be interposed between a common exchange line and each one of at least two telephones sharing the line. The device includes a voice connecting circuit connected between a respective phone and the line; a control circuit operatively engaging the connecting circuit, and having an on- and an off-state, and a trigger having a threshold voltage responsive to the line voltage controllingly engaging the control circuit to trigger it into its on-state to provide a voice connection between the telephone and the common line in response to the line voltage exceeding said threshold voltage.
    Type: Grant
    Filed: May 22, 1986
    Date of Patent: May 24, 1988
    Inventors: Kwok-Leung Chan, Shiu-Pong Lee