Patents by Inventor Leif W. Otto

Leif W. Otto 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: 5781065
    Abstract: A biphase stable FPLL includes a lock switch, operated in response to a frequency lock condition, that forces a predetermined voltage on the input of the third multiplier to guarantee that the loop locks up in a phase that produces a desired polarity of demodulated signal. A frequency lock indicator operates the lock switch to force the predetermined voltage on the third multiplier irrespective of the actual lock up phase of the loop. If the lock up phase is wrong, the voltage reversal causes the VCO to slip 180.degree. in phase and the loop locks up in its other bistable state.
    Type: Grant
    Filed: August 13, 1996
    Date of Patent: July 14, 1998
    Assignee: Zenith Electronics Corporation
    Inventors: Victor G. Mycynek, Leif W. Otto
  • Patent number: 5052047
    Abstract: A channel converter system includes a local oscillator for converting an input RF television channel frequency signal to an intermediate frequency and for remodulating the intermediate frequency signal to produce a channel output signal at the same frequency. Video processing is accomplished between the input converter and the output remodulator. For baseband decoding, another oscillator demodulates the intermediate frequency signal and remodulates the processed video signal to the intermediate frequency signal.
    Type: Grant
    Filed: April 10, 1990
    Date of Patent: September 24, 1991
    Assignee: Zenith Electronics Corporation
    Inventor: Leif W. Otto