Patents by Inventor Su-Chin Hsieh

Su-Chin Hsieh 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).

  • Optimized filter parameters design for digital IF programmable downconverter
    Patent number: 6993464
    Abstract: The present invention discloses a method for finding an optimized filter parameters design to meet input specifications and hardware constraints in accordance with a typical single channel digital IF programmable downconverter. Said typical single channel digital IF programmable downconverter comprises four stages, including a high speed down-sampling stage, a spectral shaping stage, a rate matching stage and an oversampling stage. According to input specifications, said method firstly determines a number of Halfband interpolation filters used in said oversampling stage, secondly obtains optimized parameters for a CIC decimation filter and a Halfband decimation filter in said high speed down-sampling stage, using as many Halfband decimation filters as possible. Then determine if it is necessary to use re-sampling FIR filter for rate matching.
    Type: Grant
    Filed: December 3, 2002
    Date of Patent: January 31, 2006
    Assignee: Chunghwa Telecom Co., Ltd.
    Inventors: Che-Sheng Chiu, Kai-An Tang, Su-Chin Hsieh, Chiung-Jang Chen
  • Optimized filter parameters design for digital IF programmable downconverter
    Publication number: 20040107078
    Abstract: The present invention discloses a method for finding an optimized filter parameters design to meet input specifications and hardware constraints in accordance with a typical single channel digital IF programmable downconverter. Said typical single channel digital IF programmable downconverter comprises four stages, including a high speed down-sampling stage, a spectral shaping stage, a rate matching stage and an oversampling stage. According to input specifications, said method firstly determines a number of Halfband interpolation filters used in said oversampling stage, secondly obtains optimized parameters for a CIC decimation filter and a Halfband decimation filter in said high speed down-sampling stage, using as many Halfband decimation filters as possible. Then determine if it is necessary to use re-sampling FIR filter for rate matching.
    Type: Application
    Filed: December 3, 2002
    Publication date: June 3, 2004
    Inventors: Che-Sheng Chiu, Kai-An Tang, Su-Chin Hsieh, Chiung-Jang Chen