Patents by Inventor Roger Cheng

Roger Cheng 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).

  • Data transmission system
    Patent number: 6571393
    Abstract: A data transmission system is proposed, for example for video-on-demand, internet or multimedia applications, in which a number of subscribers in a building are connected to a central server through at least in part twisted pair cables within the building. Compensation for the channel distortion caused by the use of twisted pair cables is provided by the use of pre-emphasis filters in the outgoing data lines from the server. The required coefficients for the pre-emphasis filters are established by first characterizing the distortion properties of a channel by the use of a test signal.
    Type: Grant
    Filed: May 27, 1998
    Date of Patent: May 27, 2003
    Assignee: The Hong Kong University of Science and Technology
    Inventors: Tsz-Mei Ko, Ming Liou, Kwan-Fai Cheung, Roger Cheng, Bo Hu, Donghui Qu