Patents by Inventor Jianhao Chen

Jianhao Chen 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: 11677360
    Abstract: A multi-path audio amplification system that provides an output drive signal to electromechanical output transducers provides improved undistorted headroom, reduced path switching noise, and/or improved frequency response performance. Multiple signal amplification paths receive an audio input signal and have corresponding multiple output stages that have differing output impedances. A mode selector selects an active one of the multiple signal amplification paths is selected to supply the output drive signal. Outputs of the multiple output stages are coupled to the electromechanical transducer to provide the output drive signal and at least one of the multiple signal amplification paths includes an equalization filter for filtering the audio input signal to compensate for phase or gain differences referenced from the input to the outputs of the multiple output stages due to interaction between the differing output impedances and an impedance of the electromechanical transducer.
    Type: Grant
    Filed: November 8, 2021
    Date of Patent: June 13, 2023
    Assignee: CIRRUS LOGIC, INC.
    Inventors: Leyi Yin, John L. Melanson, Eric Lindemann, Amar Vellanki, Jianhao Chen, Venugopal Choukinishi, Wai-Shun Shum, Xiaofan Fei
  • Publication number: 20220329216
    Abstract: A multi-path audio amplification system that provides an output drive signal to electromechanical output transducers provides improved undistorted headroom, reduced path switching noise, and/or improved frequency response performance. Multiple signal amplification paths receive an audio input signal and have corresponding multiple output stages that have differing output impedances. A mode selector selects an active one of the multiple signal amplification paths is selected to supply the output drive signal. Outputs of the multiple output stages are coupled to the electromechanical transducer to provide the output drive signal and at least one of the multiple signal amplification paths includes an equalization filter for filtering the audio input signal to compensate for phase or gain differences referenced from the input to the outputs of the multiple output stages due to interaction between the differing output impedances and an impedance of the electromechanical transducer.
    Type: Application
    Filed: November 8, 2021
    Publication date: October 13, 2022
    Inventors: Leyi Yin, John L. Melanson, Eric Lindemann, Amar Vellanki, Jianhao Chen, Venugopal Choukinishi, Wai-Shun Shum, Xiaofan Fei
  • Publication number: 20030083507
    Abstract: This invention relates to a method of preparing a compound type where at least one of R′ or R″ is a carbosyl group (I) by treating a compound of formula (II) with a Group I(a) or Group II(a) metal halide, with an aprotic dipolar amide-based solvent and water.
    Type: Application
    Filed: October 9, 2002
    Publication date: May 1, 2003
    Applicant: SmithKline Beecham Corporation
    Inventors: Kevin Webb, Wilford Mendelson, Jianhao Chen
  • Patent number: 6452022
    Abstract: This invention relates to a method of preparing a compound type where at least one of R′ or R″ is a carboxyl group (I) by treating a compound of formula (II) with a Group I(a) or Group II(a) metal halide, with an aprotic dipolar amide-based solvent and water.
    Type: Grant
    Filed: November 8, 2001
    Date of Patent: September 17, 2002
    Assignee: SmithKline Beecham Corporation
    Inventors: Kevin Webb, Wilford Mendelson, Jianhao Chen
  • Publication number: 20020082440
    Abstract: This invention relates to a method of preparing a compound type where at least one of R′ or R″ is a carboxyl group (I) by treating a compound of formula (II) with a Group I(a) or Group II(a) metal halide, with an aprotic dipolar amide-based solvent and water.
    Type: Application
    Filed: November 8, 2001
    Publication date: June 27, 2002
    Applicant: SmithKline Beecham Corporation
    Inventors: Kevin Webb, Wilford Mendelson, Jianhao Chen
  • Patent number: D981572
    Type: Grant
    Filed: December 12, 2022
    Date of Patent: March 21, 2023
    Assignee: Shenzhen Zhenlang E-commerce Co., Ltd.
    Inventor: Jianhao Chen