Abstract: A device for providing a substantially flat light field to a light imaging medium includes a transparent disc and an optical system. The surface of the disc is made opaque and light is coupled to the optical system through the edge of the disc by reflection from the internal surface of the disc. The intensity of light passing through the disc to the optical system decreases as the distance from the coupling edge increases. The combined effects of the disc and the optical system result in a substantially flat light field.

Abstract: A peaking circuit for use in a digital video signal processing system includes a digital peak detector which produces a peak magnitude whenever the slope of the video signal changes polarity. The peak magnitudes, and the absences of peaks are summed in an accumulator over a field period. The accumulated peaks are applied to a gain calculating circuit which develops a peaking control signal having three regimes. For low valued accumulated peaks the gain or peaking control signal is constant and relatively large. For high valued accumulated peaks the gain is constant and negative. In between the gain is in inverse porportion to the value of the accumulated peaks.

Abstract: A device for orienting an object on a flat surface includes two levers which are pivotably coupled to the surface at pivot points between the ends of the levers. An actuating device is supported by and coupled between one end of the levers. The other ends of the levers are free to urge the object into the desired orientation and location upon energization of the actuating device.

Abstract: A method of sealing an electron gun mount of a cathode-ray tube to a back section thereof comprises the steps of applying a glass frit between an edge of the back section and the mount where the sealing is to be effected, heating the glass frit to a temperature sufficient to cause the frit to become vitreous, thereby sealing the mount to the back section, and flowing a gas containing a reducing agent past the electron gun during the heating step.

Abstract: A cathode-ray tube has a rectangular faceplate panel sealed to a funnel thereof along an edge of a sidewall of the panel, and has an internal magnetic shield disposed therein proximate an inner surface of the sidewall and extending backward along an inner surface of the funnel. The magnetic shield has at least one opening disposed in at least one corner thereof for allowing dispersal of getter material therethrough and onto the inner surfaces of the sidewall and the funnel adjacent the edge.

Abstract: In processing comb filtered video signals it is desirable to separate lower frequency vertical detail signal from comb filtered chrominance and recombine it with the comb filtered luminance signal. System response is enhanced if the vertical detail is non-linear processed before it is recombined with luminance. To core, peak and pare digital vertical detail signal, the signal is passed through an absolute value circuit and then applied to a first signal combiner wherein a first reference value is subtracted from the magnitudes of the input signals. The differences are applied to a polarity discriminator which passes difference values of only one polarity. The one polarity differences are scaled and applied to one input port of a signal combining circuit. The one polarity differences are also applied to a third signal combining circuit wherein a second reference value is subtracted from the one polarity differences to produce a double difference value.

Abstract: The base for an electron tube has pin apertures configured to bias the pins inwardly against the base to help retain the base on the tube and to decrease the possibility of the connector pins being bent outwardly, away from the longitudinal axis of the tube.

Abstract: Apparatus for generating a burst gate pulse from composite video includes a threshold detector for generating output pulses on consecutive positive and negative going burst signal cycles. Output signal from the threshold detector is applied to a digital correlator which generates a control signal when a predetermined signal sequence is produced by the detector. The control signal energizes a counter to count clock pulses synchronized with the burst signal to generate a burst gate pulse have a width equal to a predetermined number of burst signal cycle periods.

Abstract: A method for sealing a mount including a wafer in a neck of a stationary cathode-ray tube comprises positioning a first tier of burner tips completely around the neck such that the burner tips are aimed nonradially along directions tangent to a first circle, the plane of the first circle being aligned along the wafer. The first tier of burner tips is split into at least first and second radial segments, each segment being connected to means for moving the segment toward and away from the neck. The first tier of burner tips, while remaining stationary, provide a vortical pattern of flames around the neck. The radial segments are then removed from around the stationary neck sufficiently to allow the tube to proceed along a conveyor line.

Abstract: A frame comb filter system having circuitry to minimize motion-induced artifacts in the reproduced image includes a line comb filter to extract a relatively high frequency luminance correction signal from frame comb filtered chrominance signal. This luminance correction signal, however, includes undesirable signal components due to vertical chrominance transitions even in the absence of motion. The system therefore includes circuitry to selectively recombine the high frequency luminance correction signal with frame comb filtered luminance signal only when motion occurs.

Abstract: A punch and pad for forming a square planar shadow mask have curved outer edges. A pair of dies respectively receiving the punch and pad have straight inner edges. The dies clamp a flat shadow mask blank and the punch is lowered to only partially form the shadow mask. The mask is then unclamped and the punch is fully lowered towards the pad to complete the forming of the mask without wrinkles.

Abstract: A system is described in which the audio subcarrier components are attenuated relative to the other components of composite television signals by an inexpensive IF filter. This filter incidentally produces quadrature distortion between the two color difference signal components of the composite television signals. The disclosed invention includes a differentiator, responsive to at least one of the color difference signals, that derives signals proportional to the quadrature distortion components present in the other color difference signal. These distortion components are then subtracted from the other color difference signal to produce a signal that is substantially free of quadrature distortion. The differentiator and subtracter are advantageously realized in the form of a simple FIR filter.

Abstract: Output weighted FIR filters usually consist of a tapped delay line, weighting circuits coupled to the taps for weighting delayed samples and adder circuitry for combining the weighted samples. In designing such circuitry, tradeoffs are made between device complexity and the desired filter transfer function. FIR filters employing shift-and-add weighting circuits may have the resolution of their weighting circuits significantly enhanced with slight added circuit complexity by providing a parallel tapped delay line to which scaled input samples are applied. The scaled and non-scaled signal samples from the parallel tapped delay lines are both made available to the weighting circuits. The availability of both such samples for shifting and adding, nominally increases the number of possible weighting coefficients realizable from the weighting circuits more than two fold and thus, improves the design flexibility of the filter significantly.

Abstract: A digital video signal processing system is described wherein analog video signal is sampled by a sampling clock phase locked to burst and the digital video samples are processed with a clock phase locked to horizontal sync. The respective sampling phases of the sampling clock are encoded and concatenated with the digital video samples for purposes of synchronously demodulating the color difference signals of composite video. Burst clock to line locked clock sample conversion is accomplished in a FIFO memory.

Abstract: A successive approximation analog-to-digital converter (ADC) which uses pipeline processing techniques is disclosed. Each stage of the ADC uses a switched capacitor both as a sample and hold element and as a voltage subtracter. An analog potential is developed at terminal one of the capacitor and then the potential applied to the other terminal is changed by switching in or switching out a source of reference potential. The resulting analog value at the first end of the capacitor is the difference between the input value and reference potential. This value is applied to the next ADC stage. The polarity of this analog difference value determines the value of the digital bit signal produced by the stage.

Abstract: An apparatus for centering a shadow mask frame in a faceplate panel includes a fixed plate and a slidable plate. A set of blades is rotatably mounted in the fixed plate. The blades are coupled to the slidable plate by coupling members whereby motion between the plates simultaneously rotates the blades. The blades extend into a space between the frame and the panel and urge the frame into a centered orientation in the panel.

Abstract: The identification of permissible variations in a CCD image perimeter as blemishes is avoided by sequentially considering the adjacent pixels of a selected plurality of pixels. Pixel motions are defined between adjacent pixels and can be either straight or diagonal. Diagonal pixel motions are recorded as straight when the first and last pixel motions are diagonal in opposite directions and the intervening pixel motions are straight.

Abstract: An apparatus for removing undesirable particles from a kinescope panel/mask frame assembly includes a plurality of thumper arms. The arms have a cam follower at one end and a thumper at the other end. Cams on a rotatable shaft engage the cam followers to raise the thumpers above the panel. The cams include inset portions to disengage the cams and cam followers. The cams and cam followers face in opposite directions so that the thumpers alternately impact the panel. During the thumping, charged air is passed across the panel/mask frame assembly to charge the assembly and any particles adhering to the assembly because of static charge. The like charges cause the particles to be repelled from the assembly. The combination of the charged airflushing and thumping disengages particles from the assembly which otherwise could cause blocked apertures or shorted electron guns.

Abstract: A system for uniformly dispensing a frit material onto the seal edge of a CRT funnel includes a motor for rotating the funnel. The motor also drives a pulse generator which provides a selected number of input pulses for each increment of rotation. The input pulses are provided to two programmable BCD counters. One counter controls the funnel motor and is programmed to change the motor speed around the funnel corners. The other counter controls the feed screw dispenser and is programmed to maintain the ratio of motor speeds within a selected range of values.

Abstract: A CRT has a spring for mounting the shadow mask assembly of the CRT onto a stud of the CRT panel. The spring has a circular flange contered on a stud receiving hole. Thus the stud hole is always straight up and at a fixed distance from a locator of an insertion machine regardless of any tilt of the spring, and therefore the shadow mask assembly is always correctly inserted into the panel.