Patents by Inventor Sang Kwang Lee

Sang Kwang 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).

  • Publication number: 20090125310
    Abstract: An apparatus and method for embedding and extracting a capturing-resistant audio watermark based on discrete wavelet transform, and a copyright management system using the same are provided. The apparatus for embedding a wavelet based audio watermark includes: a framing unit for dividing an input audio signal into small signals with a regular length; a discrete wavelet transform unit for calculating an mean value of wavelet coefficients by transforming the small signals based on a discrete wavelet transform; and an embedding unit for changing the calculated mean value according to a watermark where a synchronization signal is inserted and inserting the watermark into the audio signal.
    Type: Application
    Filed: June 11, 2007
    Publication date: May 14, 2009
    Inventors: Seungjae Lee, Sang Kwang Lee, Jin Soo Seo, Young Ho Suh, Yong Seok Seo, Seon Hwa Lee, Won Gyum Kim, Wonyoung Yoo, Sung Hwan Lee, Hye Won Jung, Young Suk Yoon