Patents by Inventor William P. Lafay

William P. Lafay 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: 6476878
    Abstract: The method, apparatus, and system for controlling audio anomalies by using a mute switch 51 to prevent output of an auxiliary audio signal 21 in a television signal 20 with an auxiliary audio signal 21, such as a NICAM audio signal or dual language audio signal, adjacent to a first audio signal 22. The mute switch 51 operation is a function of the type of receiver 19 receiving television signal 20 and a function of verifying the presence of an auxiliary audio signal 21 in television signal 20. The present invention controls audio anomalies such as audio whistle and audio pop.
    Type: Grant
    Filed: October 21, 1998
    Date of Patent: November 5, 2002
    Assignee: Scientific-Atlanta, Inc.
    Inventors: William P. Lafay, Robert C. Cheng, Benny Hsu, Martin Taylor
  • Patent number: 6272226
    Abstract: An apparatus and method is provided for transmitting “masked” stereo audio signals in a signal distribution network such as a cable television system within the bandwidth constraints of conventional frequency allocation schemes. In various embodiments, left and right stereo audio signal components (L+R and L−R) are used to amplitude modulate a carrier using independent sideband (ISB) modulation without the transmission of a pilot signal. A jamming signal or low bandwidth data signal may be transmitted in place of the normal pilot tone. Various aspects of the invention contemplate the use of Hilbert transforms to perform the ISB modulation and demodulation.
    Type: Grant
    Filed: April 2, 1997
    Date of Patent: August 7, 2001
    Assignee: Scientific-Atlanta, Inc.
    Inventors: Raheel Khan, William P. Lafay
  • Patent number: 5068893
    Abstract: Networks which remove the jamming signal from the television signal supplied to subscribers for a premium T.V. channel in a cable (CATV) or other subscription television system utilizes surface accoustic wave (SAW) devices arranged to provide a broadband all pass response across the entire band covered by all of the transmitted television channels except for a notch at the frequency of the jamming signal. The narrow band response of the filter in the premium channel is such that the notch presents insertion loss at the jamming signal frequency and over a frequency range to accommodate shifts in the frequency response of the SAW devices with respect to the frequency of jamming signal, which insertion loss is about 100 times the insertion loss at the picture carrier frequency of the television signal, even though the picture carrier and the jamming signal frequency may be within about 200 KHz apart from each other.
    Type: Grant
    Filed: May 9, 1988
    Date of Patent: November 26, 1991
    Assignee: Scientific Atlanta, Inc.
    Inventors: Lamar E. West, William P. Lafay, Majid Ghanouni, Alex M. Cook, Jr.
  • Patent number: 4748667
    Abstract: Scrambling and descrambling systems utilizing jamming signals provide improved pictures with minimal distortion due to ghosts and artifacts. The television signal is combined with a jamming signal or signals located preferably in the vestigial sideband (VSB) of the modulated picture carrier and at about a null in the spectrum of the modulation of the picture carrier by the horizontal sync. The jamming signal or signals also preferably are placed between the harmonic components of the horizontal sync which define the horizontal sync spectrum and at frequencies which comply with governmental regulations respecting frequency locations of strong signals of CATV purposes. The jamming signals are generated by phase locking to the horizontal sync signals of the television signals or to a submultiple of the horizontal sync frequency.
    Type: Grant
    Filed: November 4, 1986
    Date of Patent: May 31, 1988
    Assignee: Scientific Atlanta
    Inventors: James O. Farmer, Anatoly Kozushin, Herman A. Kruse, William P. LaFay, Christopher P. Lewis, Frank R. Little, Jr., Leo Montreuil, Leo J. Thompson, Lamar E. West, Jr., Joseph G. Mobley, II