Patents by Inventor Richard B. Angell

Richard B. Angell 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).

  • Patent number: 5189516
    Abstract: A multiple video preview system for a production video switcher or digital effects device compresses a plurality of input video signals taken from various points along a video path through the switcher or effects device. The compressed input video signals are stored in a display memory in respective designated regions. The display memory is read out in a raster scan manner. The readout of a portion of the display memory occurs simultaneously with the storing of the compressed input video signals occurs in another portion of the display memory to provide a realtime video output signal that includes each input video signal in a compressed form. The video output signal is input to a monitor to display the input video signals simultaneously.
    Type: Grant
    Filed: April 23, 1990
    Date of Patent: February 23, 1993
    Assignee: The Grass Valley Group, Inc.
    Inventors: Richard B. Angell, Kirk M. Gramcko
  • Patent number: 5166797
    Abstract: A video production switcher comprises a background mixer, a program bus for connecting a selected video source to the program input of the background mixer, and a downstream key mixer and a preview mixer each having a background input and a key fill input. The key fill inputs of the downstream key mixer and the preview mixer are each connected to receive the same key fill video signal. Each of the latter mixers combines the signal present at its background input with the signal present at its key fill input in dependence on the signal present at its control input. A preview selector connects the background input of the preview mixer selectively either to a second video source, or to the program bus, or to a third video source, and a key control switch connects the transition control input of the preview mixer selectively either to a reference potential level or to a key signal source.
    Type: Grant
    Filed: December 26, 1990
    Date of Patent: November 24, 1992
    Assignee: The Grass Valley Group, Inc.
    Inventor: Richard B. Angell