Patents by Inventor Leonard Kowal

Leonard Kowal 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: 4366451
    Abstract: A chrominance subcarrier regeneration network having high stability, the network being adapted for use in a video tape recorder and including a phase detector for comparing the phase of a gated subcarrier burst of a video signal with that of a subcarrier regenerated signal to develop an error signal; a voltage controlled oscillator driven by the error signal to develop a corrected signal at a frequency substantially below that of the subcarrier burst; and a crystal oscillator, mixer and filter for translating the frequency and filtering the corrected signal to develop the regenerated signal.
    Type: Grant
    Filed: November 12, 1981
    Date of Patent: December 28, 1982
    Inventor: Leonard Kowal
  • Patent number: 4292648
    Abstract: An improved color corrector is disclosed which is of the type that separates the color burst component from a color video signal and uses the color burst in a phase locked loop to generate a continuous color subcarrier signal that is used to provide frequency and phase error correction of the chroma component of the color video signal. The corrector uses a wide bandwidth phase locked loop and has means for adding a color corrected chroma component from a present horizontal line of the video signal to a color corrected chroma component delayed by one horizontal line to cancel other circuit induced phase errors that are present due to the use of the wide bandwidth phase locked loop and the gating of the color burst thereto using a horizontal sync related burst gate signal.
    Type: Grant
    Filed: April 9, 1979
    Date of Patent: September 29, 1981
    Assignee: Ampex Corporation
    Inventor: Leonard Kowal
  • Patent number: 4164758
    Abstract: An improved noise suppression apparatus for reducing noise contamination of a video enhancement signal including a first circuit for developing a first signal proportional to the absolute value of the enhancement signal, a peak clipper for limiting the excursion of the first signal to a predetermined level and a multiplier responsive to the enhancement signal and the clipped first signal for developing a noise reduced video enhancing signal.
    Type: Grant
    Filed: August 30, 1977
    Date of Patent: August 14, 1979
    Inventor: Leonard Kowal