Patents by Inventor Shuangxia Zhu

Shuangxia Zhu 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).

  • Transceiver parameter solution space visualization to reduce bit error rate
    Patent number: 10372521
    Abstract: Techniques and mechanisms provide a solution space visualization of bit error rates (BER) for combinations of parameter settings of transceivers. Different types of visualizations may be generated.
    Type: Grant
    Filed: June 30, 2017
    Date of Patent: August 6, 2019
    Assignee: ALTERA CORPORATION
    Inventors: Shuangxia Zhu, Yongliang Lu, Zhi Y. Wong
  • TRANSCEIVER PARAMETER SOLUTION SPACE VISUALIZATION TO REDUCE BIT ERROR RATE
    Publication number: 20170300375
    Abstract: Techniques and mechanisms provide a solution space visualization of bit error rates (BER) for combinations of parameter settings of transceivers. Different types of visualizations may be generated.
    Type: Application
    Filed: June 30, 2017
    Publication date: October 19, 2017
    Inventors: Shuangxia Zhu, Yongliang Lu, Zhi Y. Wong
  • Transceiver parameter solution space visualization to reduce bit error rate
    Patent number: 9727402
    Abstract: Techniques and mechanisms provide a solution space visualization of bit error rates (BER) for combinations of parameter settings of transceivers. Different types of visualizations may be generated.
    Type: Grant
    Filed: February 6, 2015
    Date of Patent: August 8, 2017
    Assignee: Altera Corporation
    Inventors: Shuangxia Zhu, Yongliang Lu, Zhi Y. Wong
  • Generating a quadrature seek signal from a discrete-time tracking error signal and a discrete-time RF data signal in an optical storage device
    Patent number: 5914922
    Abstract: In an optical disk storage device wherein user data is demodulated from a light beam reflecting off data pits in tracks of an optical disk storage medium, a quadrature seek signal is generated indicative of the light beam crossing tracks of the optical disk during a seek operation. The quadrature seek signal is generated from a discrete-time tracking error signal (TES) and a discrete-time RF baseband signal. The discrete-time TES is generated according to the mode of operation, compact disk (CD) or digital video disk (DVD). In CD mode the TES is generated as the difference between E and F tracking photodiodes, and in DVD mode the TES is generated using a discrete-time differential phase detector (DPD). To generate the discrete-time RF baseband signal, the RF data signal (generated as the sum A+B+C+D of a four quadrant photodiode) is sampled at the channel rate and the RF data samples passed through a discrete-time envelope detector.
    Type: Grant
    Filed: December 12, 1997
    Date of Patent: June 22, 1999
    Assignee: Cirrus Logic, Inc.
    Inventors: Louis Supino, Jim Graba, Shuangxia Zhu, Paul M. Romano
  • High pass filter with coefficient switching to improve settling time
    Patent number: 5777909
    Abstract: A high pass filter is provided utilizing a digital filter with coefficients that can be switched to provide for two responses, a fast response and a slow response. A first response is provided by an accumulator block (38) disposed between the output and a summing junction (30) on the input of the digital filter. A multiplexer (40) selects between this accumulator block (38) and a slow response accumulator block (42). The switching is effected with a zero crossing detect circuit (26). When the first and faster response brings the DC level down to a value that is close to zero, the second and slower response is selected to basically lock it to zero.
    Type: Grant
    Filed: December 29, 1995
    Date of Patent: July 7, 1998
    Assignee: Crystal Semiconductor Corporation
    Inventors: Ka Leung, Sarah Shuangxia Zhu