Abstract: A character generator in a receiver provides a character signal in raster scan form for display with a received video signal. An oscillator, not synchronized with the horizontal synchronizing component of the video signal, supplies a clock signal to the generator for controlling timing of character elements. A control unit provides a control signal representative of a time difference between the clock signal and the horizontal synchronizing component. A delay unit, interposed in the clock signal path, selectively imparts delay to the clock signal in response to the control signal for reducing line-to-line variations in the timing of displayed character elements.

Abstract: In a television receiver, a demultiplexer for a high definition multiplexed analog component television signal provides samples of each component signal. A group of samples for each component signal is selected according to the aspect ratio of the television receiver display, and according to the aspect ratio of the picture contained in the high definition multiplexed analog signal so that the selected group is the one that provides picture information which fits the aspect ratio of the display. The selected samples for one scan line are first stored during the active scan line time and then read out sequentially during the subsequent scan line time. The stored samples of each component signal are read out sequentially during substantially the same time period to provide the required Y, U, V signals. A similarly designed demultiplexer may be used to process an extended aspect ratio frequency multiplexed signal such as a high definition NTSC-formatted signal.

Abstract: An apparatus is disclosed which presents a high impedance to unwanted RF signals which may be otherwise coupled to jumper wires which traverse the boundary between RF shielded areas. Specifically, a conductor for connecting two circuits separated by a shield wall is surrounded by a ferrite material which is positioned to extend through an aperture of the RF shield.

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.

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.

Abstract: A flat-field television image having reduced visibility of horizontal scan lines is generated by receiving first and second fields of interlaced video and progressively generating a scanned image within a time for one incoming field. The progressive scanned image is formed from "real" and interpolated lines of luminance. In this arrangement the interpolated line is formed by weighting samples from time-successive lines. To improve the vertical detail of a progressively scanned image vertical detail information which may be obtained from the chrominance channel is combined with both "real" and interpolated lines, or one to the exclusion of the other, to enhance the image displayed.

Abstract: The television receiver displays the picture information of an interlaced signal, such as a baseband NTSC signal, in a non-interlaced scanning format. The NTSC signal is comb filtered in a line comb filter to extract a luminance representative component signal. When no motion occurs in the picture scene, vertical detail is added and substracted, respectively, from the luminance representative component signal to form first and second enhanced luminance signals, respectively. During each horizontal line interval of the NTSC signal, the corresponding portions of the first and the second signals contain luminance information capable of being displayed in consecutive non-interlaced scan lines, respectively, of the interlaced display. When motion is detected, vertical detail enhancement is diminished so that artifacts that may be more pronounced in the presence of motion, become less visible.

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.

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.

Abstract: A timing signal generator applies timing signals to a wide aspect ratio (1.77:1) imager in a non-interlaced HDTV system for causing the imager video output signal to exhibit a line rate of 45,000 Hz and a field rate of 60 Hz such that at each step in post production conversion of the video signal to a lower definition distribution standard the conversion equipment operates in a line locked mode thereby ensuring that fractional pixels are not produced during the conversion steps and greatly simplifying the timing of such functions as line-rate, frame-rate and aspect-ratio conversions.

Abstract: A television apparatus for displaying the picture information of an interlaced signal, such as a baseband NTSC signal, in a non-interlaced scanning format is described. When no picture change occurs, the picture information of the first and the second fields of the NTSC signal are displayed in alternate scan lines of the display of the apparatus, respectively, to form a picture frame during one vertical scanning interval. A signal, indicative that a picture change occurs in a section of the picture frame, is generated when a picture change occurs. The picture change indicative signal causes the displayed picture information in that section of the picture frame to be derived from one field of the NTSC signal.

Abstract: An HDTV television system is described for use in providing a compatible HDTV signal and an improved NTSC signal generated at a sample rate which conforms with the world studio standard. The system includes an HDTV camera and frame store. Two interlaced HDTV fields are stored in the HDTV frame store for further processing. The signals are supplied to two branched. In a first branch the samples from the frame store are anti-aliasing filtered, cropped and selected to generate a world-standard digital component source of an "improved" NTSC signal. In a second branch the samples from the HDTV frame store are aspect ratio compressed and scanned in a zig-zag pattern to generate an 11 MHz HDTV signal which is compatible with standard definition television receivers in use today.

Abstract: A television receiver/monitor includes a progressive scan processor including memories for time compressing a video input signal and doubling the line rate to reduce visible line structure when the double line-rate signal is displayed. The memories are controlled to provide a video compression factor (2.5:1) greater than the display line rate increase (2:1) to provide a display retrace time (10.8 micro-seconds) substantially equal to the blanking interval (11.0 micro-seconds) of the video input signal thereby decreasing display power losses and horizontal drive requirements.

Abstract: A digital TV system reduces the data rate by transmitting or recording only bytes representing half of the sampled pixels. Steering bits are also transmitted that tell which of the transmitted bytes are the closest match to the untransmitted bytes so the pixels represented by the later can be reconstructed. The steering or control bits are repeated for subsequent omitted bytes unless it no longer indicates a match within a selected tolerance or threshold.

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.

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).

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.

Abstract: Brightness control apparatus for a color video monitor employing AC coupled video output driver stages is disclosed. A keyed amplifier provides a brightness determinative output pulse with an amplitude related to the setting of a brightness control coupled to the amplifier. The brightness pulse is coupled via separately adjustable brightness tracking circuits to control inputs of video signal clamps respectively associated with each of the color video signal paths between the driver stages and an image display device.

Abstract: In a video signal processing system including an image displaying kinescope and a kinescope driver stage, a version of signals processed by the driver stage and video output signals from the driver stage are combined to produce a resultant high frequency signal respresentative of high frequency components deficient in the video output signal. The resultant signal is applied to an input of the driver stage to compensate for the high frequency deficiency otherwise manifested by the video output signal.

Abstract: A brightness control circuit in a video signal processing system includes an amplifier and an adjustable brightness control coupled to the amplifier input, which also receives keying pulses via a resistor-capacitor input circuit. Output pulses from the amplifier exhibit a brightness determinative amplitude related to the setting of the brightness control. To maintain a substantially constant waveshape for the output pulses as the brightness control is adjusted, a shaping capacitor is coupled between the input and output of the amplifier.