Patents by Inventor Ka Chun Kenneth Lee

Ka Chun Kenneth Lee 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).

  • Digital filter for sub-band synthesis
    Patent number: 6917913
    Abstract: In a MPEG audio decoding process, an IDCT (Inverse Discrete Cosine Transform) process that generates time domain samples from frequency domain samples using a very limited number of prestored cosine coefficients is performed. Only the cosine coefficients that satisfy cos(?*(i/64)) where i=0-32 are prestored. The cosine coefficients for i=33-63 are calculated using the prestored coefficients by changing a sign of a corresponding symmetrical one of the stored coefficients, respectively. Then, sixty-four time domain samples (Vi) are generated from thirty-two frequency domain samples (Sk) according to the equation V i = ? k = 0 31 ? cos ? ( ( ? / 64 ) ? ( i + 16 ) ? ( 2 ? k + 1 ) ) × S k where i=0 to 63, using only the prestored cosine coefficients and the calculated cosine coefficients.
    Type: Grant
    Filed: March 12, 2001
    Date of Patent: July 12, 2005
    Assignee: Motorola, Inc.
    Inventors: Kwok Wah Law, Ka Chun Kenneth Lee
  • Digital filter for sub-band synthesis
    Publication number: 20020173967
    Abstract: In a MPEG audio decoding process, an IDCT (Inverse Discrete Cosine Transform) process that generates time domain samples from frequency domain samples using a very limited number of prestored cosine coefficients is performed. Only the cosine coefficients that satisfy cos(&pgr;*(i/64)) where i=0-32 are prestored. The cosine coefficients for i=33-63 are calculated using the prestored coefficients by changing a sign of a corresponding symmetrical one of the stored coefficients, respectively.
    Type: Application
    Filed: March 12, 2001
    Publication date: November 21, 2002
    Applicant: Motorola, Inc.
    Inventors: Kwok Wah Law, Ka Chun Kenneth Lee
  • HUFFMAN DECODER WITH REDUCED MEMORY SIZE
    Publication number: 20020093438
    Abstract: In a Huffman decoder, a data structure for storing Huffman codes includes a first field for storing a 0-way code and a second field for storing a 1-way code. A first flag is associated with the first field and indicates whether the first field stores an index adjustment or a Huffman code result. A second flag is associated with the second field and indicates whether the second field stores an index adjustment or a Huffman code result.
    Type: Application
    Filed: January 16, 2001
    Publication date: July 18, 2002
    Applicant: Motorola, Inc.
    Inventors: Kwok Wah Law, Ka Chun Kenneth Lee
  • Huffman decoder with reduced memory size
    Patent number: 6411226
    Abstract: In a Huffman decoder, a data structure for storing Huffman codes includes a first field for storing a 0-way code and a second field for storing a 1-way code. A first flag is associated with the first field and indicates whether the first field stores an index adjustment or a Huffman code result. A second flag is associated with the second field and indicates whether the second field stores an index adjustment or a Huffman code result.
    Type: Grant
    Filed: January 16, 2001
    Date of Patent: June 25, 2002
    Assignee: Motorola, Inc.
    Inventors: Kwok Wah Law, Ka Chun Kenneth Lee