Patents by Inventor James J. Gibson

James J. Gibson 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: 5258928
    Abstract: A processing system requiring adaptive selection of ones of a family of transfer functions is implemented with a single transfer function element arranged to perform a transfer function representative of the family of functions. Respective ones of the family of transfer functions are realized by selectively offsetting signal applied to the transfer function element, and selectively offsetting and scaling signal provided by the transfer function element.
    Type: Grant
    Filed: December 20, 1990
    Date of Patent: November 2, 1993
    Assignee: RCA Thomson Licensing Corporation
    Inventors: Joel W. Zdepski, James J. Gibson
  • Patent number: 5255078
    Abstract: An impulse noise detector for detecting impulse noise in video signal includes a band pass filter for passing a band of video signal frequencies centered in the spectral region of video signals which exhibit a relative energy minimum. The band pass filtered signal is applied to a vertical comb filter. A threshold detector is coupled to the output connection of the comb filter for detecting the occurrences of impulse noise.
    Type: Grant
    Filed: June 29, 1992
    Date of Patent: October 19, 1993
    Assignee: RCA Thomson Licensing Corporation
    Inventor: James J. Gibson
  • Patent number: 5229847
    Abstract: In one embodiment an encoded compatible widescreen television signal includes first and second auxiliary carriers amplitude modulated with side panel chrominance information. The first and second auxiliary carriers exhibit a significant phase shift (e.g., 90.degree.) relative to a chrominance subcarrier modulated with main panel information, and exhibit phase reversal from field to field. In another embodiment, a phase shifted, amplitude modulated and field phase modulated auxiliary carrier is derived from a modulated chrominance subcarrier.
    Type: Grant
    Filed: July 12, 1991
    Date of Patent: July 20, 1993
    Assignee: General Electric Company
    Inventor: James J. Gibson
  • Patent number: 5177611
    Abstract: High definition or enhanced television signals include supplementary information which is double-sideband modulated in quadrature with the picture carrier, and passed through an inverse Nyquist filter before being combined with a conventional vestigial sideband modulated main video signal. A receiver which recovers both the main video signal and the supplementary information processes the received video signal through an IF filter having a vestigial sideband frequency response characteristic. Two synchronous detectors recover in-phase and quadrature phase signal components from the filtered television signals, these recovered signals each include quadrature crosstalk distortion components from the other signal. The crosstalk from the supplementary signal into the main signal is canceled by filtering the recovered quadrature signal and adding the result to the recovered in-phase signal.
    Type: Grant
    Filed: July 31, 1990
    Date of Patent: January 5, 1993
    Assignee: RCA Licensing Corporation
    Inventors: James J. Gibson, Krishnamurthy Jonnalagadda
  • Patent number: 5155580
    Abstract: In a television signal processing system of the type which encodes an auxiliary carrier modulated with auxiliary image information in line format, which carrier is placed within the spectral band of standard television signal components, and wherein the modulated auxiliary carrier tends to interfere with the standard television signal, the interference is minimized by spatially variably attenuating the auxiliary image information. The attenuation function is selected to apply greater attenuation to the auxiliary image information at the extremities of the lines than toward the center of the lines.
    Type: Grant
    Filed: January 7, 1991
    Date of Patent: October 13, 1992
    Assignee: General Electric Company
    Inventors: James J. Gibson, Robert N. Hurst, Jr., Jack S. Fuhrer, Terrence R. Smith
  • Patent number: 5103310
    Abstract: The present invention is directed to an improved solution to the problem of interference in the picture displayed by a standard NTSC receiver that results from a received television signal that includes a quadrature-amplitude modulated additional-information constituent passing through the Nyquist filter of the standard receiver (this additional-informaton constituent being intended for use only by wide-screen and/or extended-definition television receivers). This solution, in accordance with each of several different embodiments, employs means at the transmitter that includes frequency-dependent attenuation means operating at baseband frequencies to modify the relative amplitudes of each frequency component of the lower and upper sidebands of the transmitted television signal that defines the additional-information constituent in a manner to compensate for the attenuation characteristics of the Nyquist filter of a standard NTSC receiver.
    Type: Grant
    Filed: July 20, 1990
    Date of Patent: April 7, 1992
    Assignee: General Electric Company
    Inventors: James J. Gibson, Theodor M. Wagner, Frank B. Lang
  • Patent number: 5075774
    Abstract: High definition or enhanced television signals include supplementary information which is double-sideband modulated in quadrature with the picture carrier, and passed through an inverse Nyquist filter before being combined with a conventional vestigial sideband modulated main video signal. A receiver which recovers both the main video signal and the supplementary information processes the received video signal through an IF filter having a vestigial sideband frequency response characteristic. Two synchronous detectors recover in-phase and quadrature phase signal components from the filtered television signals, these recovered signals each include quadrature crosstalk distortion components from the other signal. The crosstalk from the supplementary signal into the main signal is canceled by filtering the recovered quadrature signal and adding the result to the recovered in-phase signal.
    Type: Grant
    Filed: July 31, 1990
    Date of Patent: December 24, 1991
    Assignee: RCA Licensing Corporation
    Inventors: James J. Gibson, Krishnamurthy Jonnalagadda
  • Patent number: 5063446
    Abstract: Apparatus for converting a signal having a substantially continuous frequency spectrum to a signal having its energy concentrated at multiples of the line frequency of a video signal, includes circuitry for apportioning the signal into two intermediate signals including, in part, mutually exclusive portions of the original signal and inverting the polarity of portions of the signal. The two intermediate signals are thereafter used to quadrature phase modulate a carrier of multiple line frequency to generate a signal for combining with a video signal for transmission.
    Type: Grant
    Filed: August 11, 1989
    Date of Patent: November 5, 1991
    Assignee: General Electric Company
    Inventor: James J. Gibson
  • Patent number: 5053858
    Abstract: In a transmitter/encoder system for processing a widescreen television signal having main panel and side panel information, side panel luminance information and side panel "Q" color difference information modulate one phase of a quadrature modulated 3.58 MHz auxiliary subcarrier, other than the standard NTSC chrominanced subcarrier, having a field reversing phase characteristics. the other (quadrature) phase of the auxiliary subcarrier is modulated with side panel wideband "I" color difference information. The "I" modulated component is filtered by an inverse Nyquist slope filter which mirrors the filter characteristics of Nyquist slop filter used at a receiver/decoder to achieve a desired flat amplitude response when the signal component containing the side panel luminannce and "Q" color difference information is demodulated.
    Type: Grant
    Filed: April 16, 1990
    Date of Patent: October 1, 1991
    Assignee: General Electric Company
    Inventors: Joshua L. Koslov, Michael A. Isnardi, James J. Gibson
  • Patent number: 4958230
    Abstract: Apparatus for augmenting a television signal with auxiliary signal includes circuitry for modulating a picture carrier with baseband video signal to generate a vestigial sideband television signal. Auxiliary signal is modulated on a further carrier of such frequency that the upper sidebands of the modulated further carrier, representing the auxiliary information, (1) occupy the frequency spectrum of the vestigial sideband of the vestigial sideband television signal and (2) occur clustered at odd multiples of half line frequency. The sidebands of the modulated further carrier are added to the vestigial sideband television signal in frequency interleaved fashion in the vestigial sideband spectral region.
    Type: Grant
    Filed: August 11, 1989
    Date of Patent: September 18, 1990
    Assignee: General Electric Company
    Inventors: Krishnamurthy Jonnalagadda, James J. Gibson, Theodor M. Wagner