Patents by Inventor Leonardus J. M. Ruitenburg

Leonardus J. M. Ruitenburg 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).

  • Synchronous demodulation circuit for a carrier-modulated television signal
    Patent number: 4929905
    Abstract: In a synchronous demodulation circuit for an IF television signal, having a passive carrier regenerator (37, 39), a quadrature component unwantedly demodulated by a synchronous in-phase demodulator (15) is compensated for by multiplying the output signal of this demodulator by the integrated (63) output signal of a synchronous in-phase demodulator (25) and by adding (79) the product obtained to the product of the output signal of a synchronous quadrature demodulator (19) and the integrated (65) output signal of a synchronous quadrature demodulator (29).
    Type: Grant
    Filed: March 6, 1989
    Date of Patent: May 29, 1990
    Assignee: U.S. Philips Corporation
    Inventor: Leonardus J. M. Ruitenburg