Abstract: A record load-unload device has a curved guide device which engages the periphery of a record being inserted into and removed from said load-unload device. A friction drive member engages the edge of the record, and a drive device moves the record along the guide device for inserting and removing a record into and out of the load-unload device.
Abstract: The method of electrophotographically manufacturing a luminescent screen assembly on a substrate of a CRT, according to the present invention, includes the steps of coating the substrate with a conductive layer and overcoating the conductive layer with a photoconductive layer, establishing an electrostatic charge on the photoconductive layer, and exposing selected areas of the photoconductive layer to visible light to affect the charge thereon. Then, the selected areas of the photoconductive layer are developed with triboelectrically charged, dry-powdered, surface-treated screen structure materials. The improved process increases the adherence of the surface-treated materials to the photoconductive layer by contacting the surface-treated materials with a solvent to render the photoconductive layer and the materials tacky.
Abstract: A phase-lock-loop circuit of a two-loop deflection arrangement is located in a first integrated circuit. The phase-lock-loop circuit generates a first signal at 32Xf.sub.H that is capacitively coupled to a tank circuit. A regenerative amplifier stage that is located in a second integrated circuit has an input terminal that is coupled to the tank circuit and an output terminal for producing a second signal. During normal operation, the second signal is synchronized to the first signal. The second signal is utilized in a phase-control-loop circuit of the two-loop deflection arrangement for generating a synchronized deflection current in a deflection winding.
Abstract: A first pair of transistors, Q721 and Q723, operating, each, as an emitter follower, has a relatively low emitter current. The emitter followers drive corresponding base electrodes of transistors of a second pair of transistors, Q148 and Q149, coupled as a differential amplifier. A current gain compensating transistor Q726 has a current gain that tracks current gain variations of each of the transistors of the second pair. A base electrode current of the compensating transistor and a second current i.sub.Q727 that is unaffected by current gain variations are summed. The summed current is coupled via transistors Q722 and Q724 of a current mirror arrangement to first and second junction terminals, 610e and 610f. The junction terminals are coupled between the respective emitter electrodes of the emitter followers and the base electrodes of the second pair.
Abstract: A mixer for mixing first and second signals for providing a difference signal comprises a mixing transistor. The first and second signals are applied between the base and emitter electrodes of the transistor. A non-linear impedance is coupled in series with the emitter electrode. Spurious signal components are reduced in amplitude compared with the difference signal.
Abstract: A bit-serial integrator includes the cascade combination of a bit-serial adder, a first bit-serial register and a second bit-serial register. Input signal is applied to one input of the adder and the output terminal of the second bit-serial register is coupled to a second input of the adder. A transparent latch is coupled to an output of the first bit-serial register and is conditioned to pass a predetermined number of sample bits and then to latch and output a particular sample bit for the duration of a sample period. The output of the latch is an integrated, scaled and truncated representation of the input signal.
Abstract: A processor which expands a compressed video signal is disclosed. The compressed video signal applied to the processor is generated by partitioning a video image into segments and then describing how each segment is filled by using a bilinear equation, that is to say, a linear equation which is a function of a horizontal coordinate X and a vertical coordinate Y. The coefficients of the X and Y coordinates each include integer and fractional parts. The circuitry develops a table of values from the coefficient of the X coordinate by repeatedly adding the coefficient in an accumulator. As each sum is produced, the integer part of the sum is stored. The table of values is developed from the stored integer sums as the difference between alternate sums, where successive alternate pairs of sums are interleaved. For example, the table would include the difference between the first and third sums followed by the difference between the second and fourth sums, then the third and fifth sums and so on.
Abstract: An evaporated material distribution controller includes specially configured portions having shaped edges to maintain the ratio of the thickest and thinnest portions of the layer of material deposited onto a surface within a ratio between 1.5:1.00 and 1.00:1.00.
Abstract: A device for indicating the size of an object, particularly a kinescope, includes a pivotal sensing-indicating arm. A sensing portion of the arm is urged by a lever which centers the kinescope on a temporary holding fixture. An indicating portion of the arm moves in response to the motion of the sensing portion and moves into alignment with one of a plurality of sensors to indicate the size of the object.
Abstract: In a switching power supply for a television apparatus, a switching stage is coupled to a source of DC input voltage and to an energy storage inductance for developing a source of DC supply voltage. Operation of the switching stage generates a switched waveform voltage in the inductance. The primary winding of a flyback transformer is coupled to and energized by the DC supply voltage. A second winding of the flyback transformer is coupled to the inductance and provides a magnetic path, via the flyback transformer, for energy to circulate between the source of DC supply voltage and the energy storage inductance. An auxiliary winding is magnetically coupled to the inductance and to a load circuit, such as a high power audio stage, for transferring at least a portion of the circulating energy to the load circuit. Additionally, the flyback transformer may be used to directly transfer energy to the load circuit.
Abstract: A multicolor filter for a display device includes separate filter elements for individually providing the primary colors of light. The areas of the filter elements are tailored in accordance with the percentages of primary light colors in pure white light, the percentages of primary light in the illuminating source, and the light transmission capabilities of the filter elements. Additionally, the filter elements are configured so that the centroid of the filter elements are within the close proximity of a straight line passing through adjacent filter elements.
Abstract: A high voltage generator of a television receiver includes a high voltage transformer having primary and high voltage windings. The high voltage winding is coupled to an ultor terminal of a picture tube via a high voltage rectifier. Retrace pulses applied to the primary winding are stepped up by the high voltage winding for generating an ultor voltage. A source of supply voltage is coupled to a current resupply terminal of the high voltage winding and produces voltage pulses at the resupply terminal having amplitudes which vary in accordance with ultor voltage loading. An envelope detector is coupled to the resupply terminal for envelope detecting amplitude variations of the voltage pulses to develop a size control signal which follows loading induced variations in ultor voltage. The size control signal is coupled to a scanning current modulator, such as a diode modulator, for modulating the scanning current in a manner that regulates the raster size.
Abstract: Apparatus for approximating a signal k(b) useful in controlling a Broadcast Television Systems Committee (BTSC) expander circuit where k(b)=R(b+1)/(b+51) and b is the root-mean-square (RMS) value of an applied signal. In order to generate the control signal k(b), the signal, b, is scaled by a first coefficient. The signal, b, is squared and scaled by a second coefficient. The scaled signal and the squared and scaled signal are combined with a constant value to produce a signal approximating the signal k(b).
Abstract: A parallel-pipeline video signal processing system is disclosed which includes a statistical decoder, an arithmetic and logic unit and a pixel interpolator which operate in parallel under the control of sequencing circuitry to expand a compressed video signal. The video signal may have been developed using a variety of compression techniques including Huffman-type statistical encoding.
November 16, 1987
Date of Patent:
April 18, 1989
Technology, Inc. 64
Allen H. Simon, David L. Sprague, John M. Keith, Michael F. Patti, Kevin Harney, Lawrence D. Ryan, Nicola J. Fedele, Brian Astle
Abstract: A secondary video signal is sampled, digitized and combined with an in-memory switching signal. The combined digital signal is stored in a random access video memory. The stored signal is read out in synchronism with the synchronizing signal components of a primary video signal. The switching signal is recovered from the output of the memory, and compared with a content code signal to develop a fast switching signal. A video output switch, coupled to receive the primary video signal and the stored secondary video signal and responsive to the fast switching signal, applies an appropriate one of the two input signals to the kinescope to define a secondary inset picture within a large primary picture.
Abstract: A system and method for monitoring the spot-knocking of electron tubes includes individually identifying each tube carrying hanger and each cart which applies a spot-knocking voltage to the tubes. The hangers and tubes sequentially engage a series of anode bus bar segments and the spot-knocking discharges are counted. The counts for each hanger and for each tube are averaged and compared with stored averages to identify faulty tubes, spot-knocking equipment and carts.
Abstract: A device for testing the adherence of a coating to a material includes a cone section and roller for bending the material around the cone section. The bent piece has a sharp bend at one end and a gradual bend at the other end. The proximity to the sharp bend at which flaking of the coating from the substrate occurs is a measure of the adherence of the coating to the material.
May 9, 1988
Date of Patent:
April 11, 1989
RCA Licensing Corp.
Jordan R. Nelson, Gilbert L. Green, Sr., Randall E. McCoy, Richard Williams
Abstract: An antialias filtering and subsampling system incorporates a compound accumulator including three cascade connected accumulator circuits conditioned to integrate and dump the integrated values of n input samples. The integrated values from the three integrators are scaled, delayed and combined to produce substampled values of a signal which has been filtered according to the transfer function [sin(n.pi.ft)/nsin(.pi.ft)].sup.3.