Patents by Inventor Theodoor M. M. Kremers

Theodoor M. M. Kremers 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: 4485401
    Abstract: A compatible television system for high-definition and for standardized low-definition television. In a transmitter (1) in the system, a high-definition video signal (VS1) is generated which is split into a contour signal (HVC2) which on display shows details in the horizontal and vertical directions, and a low-definition video signal (VS6). The low-definition video signal (VS6) is converted into a low-definition video signal (VS7) in conformity with the standard. The contour signal (HVC2) is also converted, but is transmitted periodically over several picture periods (HVC3). Both these converted signals are transmitted or stored, respectively, in two separate signal channels (3,4), each suitable for standard low-definition television. In a receiver (2) the standard video signal (VS7) can be utilized directly for low-definition display by a standard display device (8).
    Type: Grant
    Filed: September 10, 1982
    Date of Patent: November 27, 1984
    Assignee: U.S. Philips Corporation
    Inventors: Sing L. Tan, Leendert J. van de Polder, Theodoor M. M. Kremers
  • Patent number: 4411001
    Abstract: A hybrid D-PCM transmission system includes a transmitter in which an information signal x(n) is converted into a DPCM signal d(n) and an error reduction circuit in which this information signal x(n), or an estimated version thereof, is quantized and encoded to provide an error reduction signal y(n) which is added to the DPCM signal d(n), resulting in a sum signal s(n). In an associated receiver, a locally obtained error reduction signal y'(n) is subtracted from this sum signal s'(n) and the difference signal d'(n) thus produced is converted into a local version x'(n) of the information signal. This last-mentioned information signal is quantized in a local error reduction circuit and encoded to produce the local error reduction signal y'(n). In the transmitter, means are also provided for producing a quantization error signal component q(n) which is added to the sum signal s(n) for transmission.
    Type: Grant
    Filed: September 24, 1981
    Date of Patent: October 18, 1983
    Assignee: U.S. Philips Corporation
    Inventors: Marinus C. W. Van Buul, Theodoor M. M. Kremers