Patents by Inventor Johannes C. Seltenrijch

Johannes C. Seltenrijch 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).

  • Video signal coding by video signal polarity reversal on the basis of brightness level comparison
    Patent number: 4340906
    Abstract: A method and means for coding and decoding video signals by repetitive video signal polarity reversal includes the steps of comparing the brightness level of a predetermined time period of the video signal with the brightness level of the video signal over the previous predetermined time period. The polarity of the video signal is inverted or reversed if the difference in brightness level between successive predetermined time periods exceeds a given value.
    Type: Grant
    Filed: May 14, 1980
    Date of Patent: July 20, 1982
    Assignee: Oak Industries Inc.
    Inventors: Pieter den Toonder, Johannes C. Seltenrijch, Graham S. Stubbs, Pieter J. Fondse, Howard F. Jirka
  • Method of coding audio and video signals
    Patent number: 4336553
    Abstract: An audio and video signal coding system in which the normal sync pulses in the horizontal and vertical blanking intervals are suppressed, and clock and control data as well as digital audio data is inserted therein. The data, both audio information and clock data in the horizontal blanking interval is further distorted by the application of a periodic waveform and/or voltage level enhancement of certain portions of the horizontal blanking interval.
    Type: Grant
    Filed: May 14, 1980
    Date of Patent: June 22, 1982
    Assignee: Oak Industries
    Inventors: Pieter den Toonder, Johannes C. Seltenrijch, Graham S. Stubbs, Richard G. Merrell