Patents by Inventor Sung Wan Yoon

Sung Wan Yoon 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).

  • Transcoder for speech codecs of different CELP type and method therefor
    Patent number: 7472056
    Abstract: A transcoder for use between speech codecs using different Code-Excited Linear Prediction (CELP) type and a method therefor are disclosed. The transcoder includes a decoding unit of an input CELP codec, a transcoding filter, a transcoding filter design unit, and an encoding unit of an output CELP codec. By substituting a post-filter and a perceptual weighting filter of a prior art with one transcoding filter, the calculation amount of the transcoder is reduced, and speech quality decoded at a receiving end is improved.
    Type: Grant
    Filed: December 30, 2003
    Date of Patent: December 30, 2008
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Jongmo Sung, Hyun Woo Kim, Do Young Kim, Jin Kyu Choi, Sung Wan Yoon, Hong Goo Kang, Ki Seung Lee, Dae Hee Youn
  • Method for searching codebook
    Patent number: 7096181
    Abstract: A method for searching a codebook which predicts a residual element of an input voice signal includes combining each track of the input signal, forming track units including at least two tracks, and determining a pulse code for each track. The method further includes calculating energy for each track using an energy formula including a vector dot product, arranging or selecting codewords in a small track energy order, and searching or selecting an optimal pulse for a single- or double-pulse track of the selected codeword.
    Type: Grant
    Filed: October 23, 2002
    Date of Patent: August 22, 2006
    Assignee: LG Electronics Inc.
    Inventors: Sung Kyo Jung, Yong Soo Choi, Sung Wan Yoon, Kyung Tae Kim, Dae Hee Youn
  • Device and method for estimating harmonics in voice encoder
    Publication number: 20030204543
    Abstract: The present invention relates to methods and devices for estimating harmonics that reduce the calculation amount and can be used very effectively in a low transmission rate voice encoder by adjusting a harmonic interval with centering on a multiple of a basic frequency or extracting a peak so that the error between an original signal spectrum and estimated harmonic spectrum is reduced.
    Type: Application
    Filed: April 30, 2003
    Publication date: October 30, 2003
    Applicant: LG ELECTRONICS INC.
    Inventors: Sung Wan Yoon, Yong Soo Choi, Dae Hee Youn
  • Method for searching codebook
    Publication number: 20030078771
    Abstract: A method for searching a codebook which predicts a residual element of an input voice signal includes combining each track of the input signal, forming track units including at least two tracks, and determining a pulse code for each track. The method further includes calculating energy for each track using an energy formula including a vector dot product, arranging or selecting codewords in a small track energy order, and searching or selecting an optimal pulse for a single- or double-pulse track of the selected codeword.
    Type: Application
    Filed: October 23, 2002
    Publication date: April 24, 2003
    Applicant: LG Electronics Inc.
    Inventors: Sung Kyo Jung, Yong Soo Choi, Sung Wan Yoon, Kyung Tae Kim, Dae Hee Youn