Abstract: A voltage regulator for a flyback-type high voltage supply having: a pulse transformer with its secondary interconnected in series with the primary of a flyback transformer; a control circuit for sensing the generation of a flyback pulse, a reference voltage, and a feedback voltage signal appearing at the output of the flyback transformer; and a switch for selectively applying energy to the primary of the pulse transformer while uniformly maintaining the flow of current through the primary of the flyback transformer.

Abstract: A television receiver includes a frequency multiplexed video processor which processes chrominance and luminance signals in response to synchronously detected composite video information. The composite video signal is separated into a plurality of frequency spectra which are individually processed utilizing digital electronic circuitry to achieve high performance and cost effectiveness. A comb filter is operative within one of the processors to provide separation of the luminance and chrominance information within the chrominance signal bandpass to maintain high frequency luminance signal components. A separate processor and bandpass filter are operative to provide separate control of the luminance peaking within the system. Conventional luminance and chrominance processing converts the output signals of the multiplexed processor to RGB video signals which are applied to a conventional cathode ray tube display having a conventional deflection system associated therewith.

Abstract: A television receiver includes a frequency multiplexed video processor which processes chrominance and luminance signals in response to synchronously detected composite video information. The composite video signal is separated into a plurality of frequency spectra which are individually processed utilizing digital electronic circuitry to achieve high performance and cost effectiveness. A comb filter is operative within one of the processors to provide separation of the luminance and chrominance information within the chrominance signal bandpass to maintain high frequency luminance signal components. A separate processor and bandpass filter are operative to provide separate control of the luminance peaking within the system. Separation of chrominance band signals from the luminance signal prior to video clamping provides a burst-free backporch for improved video clamping in a digital video processor.

Abstract: An adaptive oscillator control system for use in television receivers or monitors includes a phase locked loop together with a static phase error correction system which responds to long term error signals of significant magnitude within the phase locked loop to adjust the free-running frequency of the oscillator. An oscillator range control includes a processor having a plurality of established oscillator frequency ranges which are identified by oscillator range code numbers. A measuring counter and clock circuit cooperate to count the number of clock signals occurring during the horizontal sync reference signal period to establish a frequency reference number. A first frequency approximation is provided based upon the oscillator range code number or a known standard scan frequency. A frequency detector examines the oscillator output and provides a second frequency approximation to adjust the oscillator frequency until it falls within the appropriate frequency range.

Abstract: A television signal transmission system is used for transmitting an N-level video related data signal. The data signal is processed prior to transmission such that the majority of N-level symbols comprise a non-negative level for facilitating receiver lock-up. An in-phase pilot component may be added to the transmission by D.C. offsetting the processed signal to further facilitate receiver lock-up. The processed signal is precoded by a modulo-N filter and postcoded by a complementary linear filter in the receiver to reduce interfering NTSC components. In the absence of interfering NTSC components, a complementary modulo-N postcoding filter may be used in the receiver to provide improved signal to noise performance.

Abstract: A dual purpose receiver can receive and process either 525-line NTSC signals or 787.5-line HDTV signals without the use of costly interlace-to-progressive scan conversion circuitry. The 525-line signal can either be stored a line at a time and repeated twice to create a 1575-line format, or it can also interpolate values based on the two adjacent received lines to create a form of averaging in the 1575-line format. The invention is not restricted to use with NTSC/HDTV systems.

Abstract: A three beam, in-line, color CRT electron gun is disclosed for use in high resolution tubes with self convergent yokes. The dynamic quadrupole and main lenses of the gun are complementary to provide emitted beams that are radially symmetrical and of like size and shape, and of constant horizontal dimension and focal length throughout the deflection cycle, thus letting the yoke provide for the correct beam focus upon deflection. Vertical emitted-beam dimension is balanced against the yoke compressive force and the increased deflected beam throw distance to provide well-controlled spot sizes.

Abstract: A production system is disclosed for registering flat tension masks to screen bearing face panels in the manufacture of cathode ray tubes. Both the panel and mask are supported in modules with identical registration features at loading stations and alternately conveyed to an assembly station with a top mounted laser welder for welding the mask to panel rails. A lift assembly up loads the modules into the assembly station where they are registered with the same registration elements. Screen location on the panel is interrogated by panel module associated cameras that view spaced fiducial marks on the panel previously located with respect to the screen. Mask interrogation is also accomplished by a camera array. Early screen interrogation enables the mask to be preliminarily positioned very close to final positioning.

Abstract: A multiple frequency scan oscillator control system includes a phase locked loop operative upon a scan oscillator to provide phase and frequency synchronization thereof to a periodic reference signal. A static phase error correction is operative to provide adjustment of the free-running or static frequency of the scan oscillator. An error amplifier includes a pair of intercoupled differential amplifier configurations one having a constant current source and the other having a frequency dependent current source which responds to a frequency dependent bias current to alter amplifier gain. A threshold detection circuit includes a differential amplifier pair coupled to a pair of switching circuits for establishing a threshold action in response to system error voltage to indicate large magnitude error voltages and signal the need for free-running frequency adjustment of the oscillator.

Abstract: A color cathode ray tube is disclosed that includes a glass faceplate having on its inner surface a centrally disposed, rectangular screen. On each of opposed sides of the screen is plurality of discrete ceramic mask support segments to which are secured a tensed foil shadow mask. A process for fabrication is also disclosed.

Abstract: A reset control circuit for an EAROM includes a zener diode coupled across the input of a voltage regulator which supplies operating voltage for the EAROM. The breakdown voltage of the zener diode is greater than the output voltage of the regulator. During turn-on, the reset voltage, which is taken from the zener diode, is held below the low point of its active region until the operating voltage has been established. During turn-off, the operating voltage is maintained until the reset voltage has become inactive, i.e. has dropped below its reset low voltage. The sequencing of operating voltage and reset voltage protects the data in the EAROM.

Abstract: An apparatus and method for differentially stretching a flat tension mask to register apertures in the mask with an undedicated screen on a CRT faceplate. Stretching is accomplished biaxially on the mask with a plurality of separate clamping elements along all four sides of the mask. Various methods and means are disclosed for applying a fixed ratio of forces to the clamps to maintain strain in the mask substantially uniform across the entire mask, such as a "wiffle tree" linkage and selected spring rate springs. Growth of the mask during stretching is accommodated by allowing the clamps to move laterally or perpendicular to the stretching forces. Fragile slit aperture masks are stretched with clamps having tangential component stretching forces. Individual and/or groups of clamps can be controlled independently of others to correct for localized mask or screen defects. The clamps move in unison toward the mask to a clamp engagement position where they are precisely aligned in a starting position.

Abstract: A television signal receiver includes a comb filter having a plurality of spaced nulls for reducing undesired co-channel interference. The depth of the nulls is established in response to a control signal representing the strength of the undesired co-channel interference to provide an optimized tradeoff between interference attenuation and signal-to-noise degradation. The control signal is preferably generated in response to a received reference signal such as a pseudo random channel equalization code. The output of the comb filter is characterized by an intersymbol interference component which is canceled is an intersymbol interference filter which is also responsive to the control signal.

Abstract: A peaking system for a compressed digital video signal includes a transform coder for converting 8.times.8 blocks of video pixels into corresponding groups of transform coefficients and supplying the coefficients to an image classifier where the coefficients are classified according to their perceptual nature or image types, e.g. edge, flat area, texture, etc. of the video represented thereby. Control signals for horizontal and vertical perceptual classifications are developed and applied to a peaking filter for selectively peaking the video signal in accordance with the horizontal and vertical control signals. A receiver operates to recover the selectively peaked compressed video signal. In another embodiment, the transmitter supplies the video signal with the developed control signals for use by a receiver in selectively peaking the recovered video signal in accordance with the control signals.

Abstract: A television receiver for displaying a 4.times.3 aspect ratio color video signal on a 16.times.9 aspect ratio surface where the digitized luma and chroma signals have a 4:2:2 or a 4:1:1 relationship of Y, R-Y and B-Y samples. A signal having an equal number of luma and chroma samples is developed by generating additional chroma samples by averaging chroma sample values over a group of two (or four for a 4:1:1 signal) successive real values. The luma and chroma samples are compressed by twenty-five percent to form a converted color signal for display. In one version this is accomplished by discarding pixels when writing into a line memory. In another version this is accomplished by reading the pixels out of a line memory at 4/3 the write clock frequency.

Abstract: A laser based accelerometer system uses small motion induced shifts in frequency to measure the motion of an object without contact thereof. This technique is particularly useful for determining the vibratory and velocity characteristics of objects that are otherwise inaccessible for direct motion measurement by contact sensors.

Abstract: A system for standardized printing of CRT screens is disclosed. A preferred embodiment utilizes a standardized photoexposure stencil made without the use of a shadow mask aperture pattern and projection printing. The stencil is then placed in proximity to the screening surface during exposure. Front panel and mask support topography preparation methods and apparatus are disclosed, as are means and methods for compensating for variations among panel assemblies utilized in standardized printing of the screens. The system thereby produces high resolution screens which may accept interchangeable shadow masks.

Abstract: A programmable circuit for sampling an IR signal is responsive to a clock signal and a plurality of programmable factors which establish the characteristics of the sampling pattern. The circuit provides successive groups of samples whose resolution, phase and periodicity are established by the programmable factors such that IR signals characterized by different formats may be conveniently accommodated by the same hardware.

Abstract: An audio subsystem for use in an HDTV broadcast system includes a sampler for sampling an analog audio signal at a sampling rate of 3H, where H is the NTSC horizontal scanning frequency. The sampled audio signal is formatted into repetitive blocks which are supplied to a compressor at a rate comprising an integral multiple of the data transmission frame rate of the HDTV system. An HDTV signal including the compressed audio blocks and a compressed video signal is transmitted and received by an HDTV receiver. The receiver reproduces a wideband video signal for display at a horizontal scanning rate of NH, where N is an integer equal to or greater than two, and an expanded digital audio signal at a sampling rate of 3H for driving a speaker system.

Abstract: A drop-out correction circuit for use in a VCR includes a generator for developing a gating signal identifying selected horizontal lines of a video signal containing spatially non-correlated encoded data. A control signal developed in response to a drop-out detection signal and the gating signal is applied to a drop-out corrector for providing a drop-out corrected signal at an output terminal except during the occurrence of said selected lines. A noise cancellation circuit operative except during the selected horizontal lines may be coupled to the output of the drop-out corrector.