Abstract: A circuit is provided for encoding digital data to be recorded on high-density magnetic storage media. The circuit converts serial data to modified phase modulation encoded serial data with time encoding or write precompensation.

Abstract: A cathode-ray tube including feedback means capable of producing a feedback signal indicative of the position, in at least two dimensions, of a scanning electron beam. The feedback means comprises a plurality of feedback elements disposed at selected locations within the tube enclosure. With a shadow-mask type CRT, the elements are formed on the gun-side surface of the shadow mask itself. With other kinds of CRT's, the elements are formed either on an interior supporting member or on the interior surface of the display medium. In one embodiment, the elements are formed of a phosphorescent material. In other embodiments, the elements are formed of materials capable of producing, upon excitation by a scanning electron beam, signals of visual or electrical character. The signals thus produced may be employed in a closed-loop correction system to accomplish automatic convergence and/or geometric adjustment of a displayed image.

Abstract: A circuit including a conventional digital-to-analog converter (DAC) and a charge pump for producing an analog representation of an input waveform defined by an input digital bit stream, the analog representation being relatively free of spurious aberrations usually present in the output of a conventional DAC. The charge pump and an associated integrator are used to produce a first approximation of the input waveform and the DAC and an associated detuned slew-rate filter are used to maintain the first approximation in long-term conformance with a more accurate second approximation. Spurious aberrations in the second approximation are integrated over several steps of the input bit stream, thereby minimizing their adverse impact on the relatively true first approximation.

Abstract: This disclosure describes an electrical connector for joining microcircuit or microcircuit modules, such as leadless integrated or hybrid circuit carriers to utilization means, such as printed or etched circuit boards or similar means. The electrical contacts through which the microcircuit and utilization means are connected are formed and etched in place on an elastomeric material, precisely located; the material acting as a restoring force to maintain connection. The connector when used in a system maintains transmission line mediums in a single environment.

Abstract: A system and method for receiving an input bit stream defining a non-interlaced video image and for producing concurrently an output bit stream defining an interlaced representation of such image. Intermediate storage of every other input raster line in a first-in/first-out oriented memory permits the output of the interlaced signal to be interleaved with the receipt of the non-interlaced input, and the interleaving of the input and output operations permits the use of a memory module having a capacity less than that required to store a complete raster line of input information. Provision is also made for synchronizing the output operation to U.S. or European standards.

Abstract: A substantially transparent interference shield wherein a flexible material employed to form an interlayer laminating a thin metal screen between two panels of glass is extended beyond the periphery of the panels a distance less than the screen so as to provide the necessary support permitting the shield to be mounted in a surrounding frame solely by clamping engagement of the extended screen. Provision is also made for the additional encapsulation within the flexible material of a resilient gasket employed to enhance electrical contact between the screen and the frame.

Abstract: A system and method of same for converting an electrical signal defining a refreshed raster-scan image of n differentiable components, for example, colors, into a permanent hard-copy representation of such image in terms of the cumulative sum of such components. Successive segments of a raster-scan image are scrolled across the display screen of a cathode-ray tube whose target structure comprises n adjacent strips of different phosphor materials so as to successively expose a sensitized medium scrolled at the same rate adjacent the screen to each component of each segment of the image, thereby producing in such medium a copy of such image.

Abstract: A circuit within a cathode-ray tube electromagnetic deflection system for correcting side pincushion distortion and regulating picture width independent of changes in the video line rate. The circuit employs a predistorted AC reference signal and a second DC reference signal in a closed-loop manner to cause a deflection current to describe precisely an ideal waveform defining simultaneously both pincushion correction and picture width regulation.

Abstract: A circuit, including a dual-mode amplifier, for producing a controlled current through an inductance; in particular, the inductive yoke of a cathode-ray tube electromagnetic deflection system. A diode coupled to a fly-back capacitor operates automatically to connect the capacitor in parallel resonant connection with the yoke whenever the voltage induced in the yoke exceeds a predetermined value, thereby switching the circuit from a linear mode to a non-linear mode. In a repetitive beam-sweeping environment, the circuit operates in the linear mode during forward scan time and in the non-linear mode during reverse retrace time. In the more general case, the circuit switches from linear operation to non-linear operation whenever the rate of change of a single input signal exceeds a predetermined design rate.

Abstract: A matrix multiplier is disclosed for rotating, scaling, shearing, and stretching, three-dimensional calligraphic images. This system has particular application to incremental vector generators. The transformations are performed in real time and at the drawing rate of the display device (CRT, plotter, etc.). Complex curved images are transformed as quickly as straight lines. This system reduces matrix multiplication to incremental additions distributed along each line of an image as it is drawn.

Abstract: This disclosure describes an electrical connector for joining microcircuit or microcircuit modules, such as leadless integrated or hybrid circuit carriers to utilization means, such as printed or etched circuit boards or similar means. The electrical contacts through which the microcircuit and utilization means are connected are formed and etched in place on an elastomeric material, precisely located; the material acting as a restoring force to maintain connection. The connector when used in a system maintains transmission line mediums in a single environment.

Abstract: A circuit within an image-forming system for enhancing the gray scale quality of a refreshed raster-scan presentation by causing the raster lines of successive frames of such presentation to be successively interlaced whether such frames are of single- or double-field composition. Also disclosed is a hard-copy device employing such a circuit.

Abstract: A device and method for producing a digital signal representative of the position of a moveable control stick relative to one or more reference planes. The device includes means for detecting the location of a shadow cast by a portion of the control stick extending between one or more light-emitting elements and one or more light-sensitive elements, and means for generating a digital signal representative of the detected location. With the light-emitting or light-sensitive elements oriented in a planar array, the signal thus generated is representative of the position of the control stick relative to the plane of the array.

Abstract: A means and method for accessing a digital memory system in a manner permitting the transfer of a two-byte information signal into and out of a storage area defined by any two logically adjacent memory bytes. Provision is also made for maintaining a preselected locational integrity between the bytes forming the information signal.

Abstract: A beam-index display system wherein a control signal representative of the position of an electron beam within a beam-index cathode-ray tube is employed to control concurrently both the generation and selection of video drive signals for transmission to the beam-producing apparatus of the tube.

Abstract: A system and method for varying the phase of an index-related control signal produced within a beam-index display system in a manner compensating for the effects of cross-modulating the index signal with the video drive signals. Provision is made for monitoring the magnitudes of selected video drive signals and for shifting the phase of the control signal in a manner compensating for the effects of such drive signals on the index signal from which the control signal is derived.

Abstract: A system for controlling the amplitude of a drive signal applied to a stepping motor in a manner minimizing the effects of resonance on the resultant angular velocity of the motor shaft. Means are provided for comparing a desired motor drive frequency against one or more known resonant frequencies and, responsive to such comparison, for producing a motor drive signal at an amplitude predetermined to minimize oscillatory fluctuations in the motor shaft velocity.

Abstract: A circuit and method for receiving and sequentially decrementing the x and y coordinates of a desired cursor location so as to produce in a raster-scan display system a cross-hair cursor the component parts of which extend the full height and width of the display area.

Abstract: This disclosure describes an electrical connector for joining microcircuit or microcircuit modules, such as leadless integrated or hybrid circuit carriers to utilization means, such as printed or etched circuit boards or similar means. The electrical contacts through which the microcircuit and utilization means are connected are formed and etched in place on an elastomeric material, precisely located; the material acting as a restoring force to maintain connection. The connector when used in a system maintains transmission line mediums in a single environment.

Abstract: Electrographic paper is fed over a segmented platen where its dielectric surface receives image defining electrostatic charges deposited by styli bearing directly and successively upon it. The styli are integral to an endless belt moving laterally to the surface. Voltage pulses corresponding to the input information are applied to the segmented platen to produce the electrostatic charges. The latent image charged surface is progressively fed to an image toning and fixing cycle to produce a hard copy.