Patents by Inventor Josephus A. H. M. Kahlman

Josephus A. H. M. Kahlman 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).

  • Color video system with digital audio pulse width modulation
    Patent number: 4660097
    Abstract: A method of encoding a recording signal which includes a composite color video signal and a digital audio signal, for recording the same on and reading it from an optical video disc is disclosed. The color video signal is frequency-modulated on a carrier wave in the customary manner, while the audio signal pulse-width modulates the carrier wave.
    Type: Grant
    Filed: December 2, 1985
    Date of Patent: April 21, 1987
    Assignee: U.S. Philips Corporation
    Inventors: Kornelis A. Schouhamer Immink, Ronaldus M. Aarts, Josephus A. H. M. Kahlman
  • Apparatus for time base correction
    Patent number: 4642702
    Abstract: A method is described on encoding a recording signal comprising a composite color video signal and a digital audio signal, for recording said signal on and reading it from an optical video disc. The color video signal is frequency-modulated on a carrier in the customary manner, while the audio signal is added to said frequency-modulated signal as a pulse-width-modulated digital signal.
    Type: Grant
    Filed: July 13, 1984
    Date of Patent: February 10, 1987
    Assignee: U.S. Philips Corporation
    Inventors: Josephus A. H. M. Kahlman, Adrianus H. Hoogendijk
  • Apparatus for furnishing data signals from an optically readable record carrier at the same frequency as the associated subcode signals
    Patent number: 4631714
    Abstract: A compact-disc-digital-audio player may be adapted to read optical audio discs in which digital information is stored by controlling the time-base correction circuit in this player by means of a clock signal whose frequency is not a constant reference frequency but a frequency which is locked to the time base of the signal being read. As a result of this both the data signal and the subcode will have the same time base without the necessity of modifying the integrate circuits available for the compact-disc digital-audio player.
    Type: Grant
    Filed: November 17, 1983
    Date of Patent: December 23, 1986
    Assignee: U.S. Philips Corporation
    Inventors: Josephus A. H. M. Kahlman, Constant P. M. J. Baggen