Patents by Inventor Gerhard R. Ristau

Gerhard R. Ristau 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).

  • Multimedia terminal with an encoder for converting analog video data to compressed digitized video data
    Patent number: 5949441
    Abstract: A multimedia terminal for adapting audio-video signals into a digital data network is provided. The terminal comprises a video decoder, a video encoder, a frame buffer, and a host processor coupled to the frame buffer. The frame buffer has a plurality of memory fields, a system time clock that is switchable from a free running clock to being locked to the analog video signals and a frame buffer logic control circuit which controls the flow of data in and out of the memory fields. The frame buffer is able to operate in two distinct modes.
    Type: Grant
    Filed: August 1, 1997
    Date of Patent: September 7, 1999
    Assignee: International Business Machines Corporation
    Inventor: Gerhard R. Ristau