Patents Represented by Attorney, Agent or Law Firm R. H. Kurdyla
  • Patent number: 4642696
    Abstract: A television receiver includes a kinescope and a current sensing transistor for conveying amplified video signals to the kinescope, and for providing at a sensing output terminal an output signal related to the magnitude of kinescope current conducted during given sensing intervals. A clamping circuit clamps the sensing output terminal during normal image intervals, and unclamps the sensing output terminal during the sensing intervals. The clamping circuit facilitates interfacing the sensing transistor with utilization circuits which process the sensed output signal, and assists to maintain a proper operating condition for the sensing transistor.
    Type: Grant
    Filed: July 25, 1985
    Date of Patent: February 10, 1987
    Assignee: RCA Corporation
    Inventor: John B. George
  • Patent number: 4642690
    Abstract: In a video signal processing and display system such as a television receiver employing digital video signal processing techniques, viewer generated control signals for normally controlling the brightness and/or contrast of a displayed image are utilized in analog rather than digital form for controlling the magnitude of the video signal.
    Type: Grant
    Filed: August 27, 1984
    Date of Patent: February 10, 1987
    Assignee: RCA Corporation
    Inventor: Werner Hinn
  • Patent number: 4642691
    Abstract: An input filter for coupling television signals from a signal source such as an antenna to an RF signal processing stage includes series resonant input and output sections shunting the signal path. The input section forms a trap at the video IF frequency. The output section resonates at a frequency other than the sound IF frequency, below the band of television signal frequencies to be processed by the RF signal processing stage. The filter serves to attenuate unwanted stray signals such as video and sound IF components otherwise capable of interfering with and distorting the input television signals.
    Type: Grant
    Filed: February 28, 1985
    Date of Patent: February 10, 1987
    Assignee: RCA Corporation
    Inventor: Dursun Sakarya
  • Patent number: 4641194
    Abstract: In a digital video signal processing system including a kinescope for displaying a video image, a video signal digital-to-analog converter receives input digital video signals and provides high level output analog video signals with a magnitude suitable for directly driving an intensity control electrode (e.g., cathode) of the kinescope.
    Type: Grant
    Filed: August 27, 1984
    Date of Patent: February 3, 1987
    Assignee: RCA Corporation
    Inventor: Werner Hinn
  • Patent number: 4639786
    Abstract: An IF signal filter in the IF sound channel of a television receiver exhibits peak amplitude responses which are unsymmetrical and slightly offset from the nominal picture and sound carrier frequencies by an amount dictated by the amount of tilt introduced by the tuner and the IF signal processing section. As a result, a filtered IF signal applied to a sound demodulating system exhibits a substantially symmetrical characteristic with respect to both the sound and picture carrier frequencies, yielding reduced audio buzz and harmonic distortion.
    Type: Grant
    Filed: October 23, 1985
    Date of Patent: January 27, 1987
    Assignee: RCA Corporation
    Inventors: Gregory G. Tamer, David E. Hollinden
  • Patent number: 4639785
    Abstract: In a television receiver, a non-saturating kinescope driver amplifier arrangement includes an input current limiter circuit coupled between a source of video signal and a current responsive signal input of a feedback kinescope driver amplifier. The limiter circuit, e.g., including a diode limiter, limits the magnitude of input signal currents applied to the current input of the amplifier to prevent the amplifier from exhibiting a saturated conductive state.
    Type: Grant
    Filed: March 26, 1984
    Date of Patent: January 27, 1987
    Assignee: RCA Corporation
    Inventors: James C. Tallant, II, Robert P. Parker
  • Patent number: 4635118
    Abstract: A DC coupled system for automatically controlling the peaking content of a video signal includes a frequency selective peaking amplifier, a source of control voltage for controlling the conduction of the amplifier, and an interface circuit including a high output impedance current source network for coupling the control voltage to the amplifier. The interface circuit prevents the amplifier from being loaded excessively by the impedance of the source of control voltage, and assists to assure that the amplifier exhibits negligible gain for DC conditions.
    Type: Grant
    Filed: January 28, 1985
    Date of Patent: January 6, 1987
    Assignee: RCA Corporation
    Inventors: Ram S. Batra, Kenneth A. Pitcher
  • Patent number: 4633321
    Abstract: A television receiver with a planar faceplate kinescope includes an automatic kinescope bias (AKB) control system wherein the kinescope electron gun is energized to induce a cathode output current, representative of the kinescope black image current level, in response to an auxiliary drive signal applied to the electron gun during AKB operating intervals. The auxiliary signal exhibits an amplitude for inducing the cathode current only during horizontal trace intervals encompassed by the interval when the auxiliary signal occurrs.
    Type: Grant
    Filed: April 23, 1985
    Date of Patent: December 30, 1986
    Assignee: RCA Corporation
    Inventor: James C. Tallant, II
  • Patent number: 4633320
    Abstract: In a digital video signal processing system including an image reproducing kinescope and a digital-to-analog converter (DAC), excessive kinescope beam current are automatically limited in response to a control signal which varies a reference voltage for the DAC such that the peak-to-peak amplitude of analog video signals from the DAC is reduced. A version of the control signal is applied to the output of the DAC with a magnitude and polarity for substantially negating unwanted shifts of the video signal black level during the beam current limiting mode.
    Type: Grant
    Filed: March 8, 1984
    Date of Patent: December 30, 1986
    Assignee: RCA Corporation
    Inventor: Donald H. Willis
  • Patent number: 4631591
    Abstract: A video monitor includes an image displaying kinescope which exhibits a temperature dependent conduction characteristic that results in declining light output and image brightness during an initial warm-up period, from a time soon after the system is initially energized to a time several minutes later when steady-state operation is reached. To counteract the declining kinescope light output during the warm-up interval, a compensation circuit having a time constant characteristic which approximates the kinescope conduction characteristic during the warm-up interval causes the kinescope to exhibit increasing light output and image brightness during the warm-up interval. Thus substantially uniform light output is produced over the warm-up interval.
    Type: Grant
    Filed: February 8, 1985
    Date of Patent: December 23, 1986
    Assignee: RCA Corporation
    Inventor: Wayne Lee
  • Patent number: 4631595
    Abstract: In a television receiver including a kinescope, a kinescope driver stage includes a video amplifier with an associated feedback path. A first emitter follower transistor couples amplified video signals from the amplifier output to the kinescope. A second emitter follower transistor, included in the feedback path for maintaining the continuity thereof, couples amplified video signals to the kinescope when a normally nonconductive diode coupled between the outputs of the emitter follower transistors is rendered conductive in the presence of large video signal amplitude transitions sufficient to render the first follower transistor nonconductive.
    Type: Grant
    Filed: July 25, 1985
    Date of Patent: December 23, 1986
    Assignee: RCA Corporation
    Inventor: John B. George
  • Patent number: 4625233
    Abstract: In a chrominance signal demodulating system a locally regenerated chrominance subcarrier signal is phase shifted to produce R-Y, G-Y and B-Y phase subcarrier signals, which are applied to respective color difference signal demodulators together with the chrominance signal to be demodulated for producing demodulated R-Y, G-Y and B-Y color image difference signals. The subcarrier signal is at the "I" phase and is processed by an automatic flesh tone correction network responsive to chrominance signal phases in the vicinity of I phase.
    Type: Grant
    Filed: June 26, 1985
    Date of Patent: November 25, 1986
    Assignee: RCA Corporation
    Inventor: Leopold A. Harwood
  • Patent number: 4622589
    Abstract: In a television receiver with a kinescope driver stage for providing video drive signals to an image displaying kinescope, a control circuit couples an auxiliary character information signal to a reference input of the driver stage, separate from a source of reference bias potential also coupled to the reference input of the driver stage. The intensity of displayed character information is related to the control circuit biasing, which is derived from a pre-existing local source of alternating current signal.
    Type: Grant
    Filed: April 15, 1985
    Date of Patent: November 11, 1986
    Assignee: RCA Corporation
    Inventor: Isaac M. Bell
  • Patent number: 4620220
    Abstract: A color television receiver includes a comb filter responsive to detected video signals for providing a wideband combed chrominance signal, which is coupled to chrominance processing circuits via a composite filter including plural mutually interactive resonant sections. An input resonant section of the filter serves to remove very high frequency interference signals including comb filter switching components from the chrominance signal path, and also coacts with the other filter sections to provide an amplitude characteristic having a sense to compensate for an oppositely directed amplitude characteristic associated with the detected video signals, over the passband of the wideband chrominance signals.
    Type: Grant
    Filed: June 28, 1983
    Date of Patent: October 28, 1986
    Assignee: RCA Corporation
    Inventors: Saiprasad V. Naimpally, Wesley W. Murphy, III
  • Patent number: 4612576
    Abstract: A video processing and display system includes an image displaying kinescope, an AC coupled kinescope driver stage, and a system for automatically controlling the kinescope bias. During image blanking intervals the kinescope grid electrode is excited to induce a cathode output pulse related to the magnitude of the kinescope black current level. A DC restoration circuit responds to the induced pulse and provides to the kinescope a bias control signal related to the magnitude of the induced pulse, for maintaining a desired kinescope black current bias.
    Type: Grant
    Filed: October 1, 1984
    Date of Patent: September 16, 1986
    Assignee: RCA Corporation
    Inventor: Werner Hinn
  • Patent number: 4612577
    Abstract: A television receiver includes an interface network for selectively coupling either a standard broadcast television signal, or auxiliary analog or digital video signals, to an image display device. The interface network includes a keyed circuit for clamping the auxiliary signals. A pulse for keying the clamping circuit exhibits one timing characteristic when analog auxiliary signal are selected for display, and a different timing characteristic when a digital auxiliary signal is selected for display.
    Type: Grant
    Filed: June 26, 1985
    Date of Patent: September 16, 1986
    Assignee: RCA Corporation
    Inventor: Ronald T. Keen
  • Patent number: 4603319
    Abstract: In a digital video signal processing system including an image displaying kinescope, a digital-to-analog signal converter (DAC) comprises a VMOS transistor arrangement with a gate electrode, a drain electrode from which output analog signals are provided, and plural source areas with associated source electrodes which receive input digital signals. The source areas are binarily scaled to reduce effective output capacitance and power consumption. The DAC is also suitable for directly driving a high level cathode electrode of the kinescope.
    Type: Grant
    Filed: August 27, 1984
    Date of Patent: July 29, 1986
    Assignee: RCA Corporation
    Inventor: Werner Hinn
  • Patent number: 4602278
    Abstract: In a television receiver, apparatus for non-linearly processing a vertical detail signal includes a plurality of cascaded amplifier stages responsive to an input vertical detail signal and which exhibit linear and limiting operating regions. Vertical detail signals from the amplifiers are translated and combined with a linear version of the input vertical detail signal. The combined vertical detail signal exhibits a characteristic wherein small amplitude excursions within a first amplitude range are cored, moderate amplitude excursions within a second amplitude range are amplified with a given non-zero gain, and large amplitude excursions within a third amplitude range are pared (attenuated).
    Type: Grant
    Filed: November 28, 1983
    Date of Patent: July 22, 1986
    Assignee: RCA Corporation
    Inventors: Dalton H. Pritchard, Donald J. Sauer
  • Patent number: 4600950
    Abstract: A video signal processing and display system includes an image displaying kinescope, a kinescope driver amplifier, and a system for automatically controlling the kinescope bias in response to a sensed signal representative of the kinescope black current level. The sensed signal is developed across a relatively small value sensing resistor coupled in series with a load resistor between a source of operating potential and the video output terminal of the driver amplifier, in the order named.
    Type: Grant
    Filed: October 1, 1984
    Date of Patent: July 15, 1986
    Assignee: RCA Corporation
    Inventor: Werner Hinn
  • Patent number: 4599642
    Abstract: A color television receiver with luminance and chrominance signal channels includes an automatic kinescope beam current limiter, an automatic white level drive control network, and an automatic black level bias control network. A switching network is timed to operate such that a control signal developed by the beam current limiter is coupled to the luminance channel during normal picture intervals, but is decoupled from the luminance channel during both white level drive control intervals and black level bias control intervals. The beam limiter control signal is continuously coupled to the chrominance channel, independent of the operation of the switching network, to permit chrominance output bias offset errors produced by beam limiter action to be sensed and compensated for by the automatic bias control network.
    Type: Grant
    Filed: March 2, 1984
    Date of Patent: July 8, 1986
    Assignee: RCA Corporation
    Inventor: Donald H. Willis