Abstract: A graphics display unit providing rapid filling of predetermined areas of the display screen with one or more predefined repetitive patterns stored in the undisplayed portion of a frame buffer memory. The picture processor in executing a display list will encounter commands to load the predefined patterns(s) into the undisplayed portion of the frame buffer memory. The pattern is copied or replicated from there across the entire width of the frame buffer, with the final replication of the pattern being truncated. The display control unit fills the predetermined shapes or areas of the image to be displayed with the pattern(s) thusly loaded into the frame buffer memory, by copying sections of the scan lines of the replicated pattern up into the displayed section of the frame buffer specifically defining the shape to be filled-in. Pattern alignment between contiguous areas to be filled in with that pattern, is provided.

Abstract: An oscilloscope displays a menu consisting of set of field codes and one configuration code set grouped with each field code. Each field code represents an oscilloscope operating parameter while each configuration code represents an alternative oscilloscope operating mode associated with the operating parameter. A configuration cursor is displayed underlining one configuration code in each field thereby indicating the current operating configuration of the oscilloscope. The configuration of the oscilloscope may be changed by first rotating a first control knob, mounted on the oscilloscope front panel, to locate a field selection cursor under a selected field code and then by rotating a second control knob to move the associated configuration cursor under the desired configuration code. The configuration of each field may be altered by selective operation of the two control knobs in this manner.

Abstract: A regulated high voltage supply derives two regulated high voltages from a single winding of a transformer. The higher voltage supply is primary side pass regulated, and the lower voltage supply is secondary side offset regulated. The two regulating circuits for the two regulated high voltage supplies interact with each other to correct an error in either high voltage supply.

Abstract: A grounding and supporting metal mesh provides connection between a circuit board with a cavity and a housing. The mesh is in the form of a spring made by interconnected torsional members. The mesh is plated with a metal which is compatible with the ground planes of the circuit board and housing.

Abstract: A propagation delay time controller comprises a phase locked ring oscillator and a bias signal generator for controlling the propagation delay time of logic elements on an integrated circuit. The logic elements are of a type in which propagation delay time is a function of an applied bias signal. The ring oscillator, comprising representative logic elements on the controlled integrated circuit, oscillates with a frequency dependent on the propagation delay time of the oscillator logic elements. The bias signal generator compares the oscillator output voltage with a known, pulsed reference signal and generates a bias signal proportional to the integral of the phase difference between the oscillator and reference signal pulses. The bias signal is applied to all logic elements in the ring oscillator and to all other logic elements on the integrated circuit to be controlled.

Abstract: The present disclosure of the invention is directed to rectangular wave pulse generators. The rectangular wave pulse generators comprise a circuit for providing a train of voltage pulses each having a trailing edge and a leading edge, at least one of said edges being of generally ramp-like form, a comparator having a first input to which said train of voltage pulses is applied, as second input to which a d.c. voltage level is applied and an output at which is developed a signal having one or two voltage levels dependent upon whether or not the voltage level of the train of voltage pulses exceeds said d.c. voltage level, whereby the comparator provides at its output a periodic rectangular wave signal having at least one transistion of which the phase is dependent upon said d.c. voltage level.

Abstract: A stepping motor generates first and second voltages each varying in accordance with a sinusoidal function having a period proportional to the period of rotation of the motor's rotor, the first and second voltages being in quadrature with each other. A control device generates from the first and second voltages a signal representative of a number that is proportional to the square root of the sum of the squares of the first and second voltages. This signal is used to modify the energizing current provided to the phase windings of the stator, in order to reduce fluctuations in torque and shaft angular velocity.

Abstract: A high-speed electro-optical light gate (40) includes a pair of matched variable optical retarders (54 and 56) positioned between a pair of light polarizing filters (42 and 44) to promote rapid switching between optical transmission states for light rays of the wavelength to which the variable optical retarders are tuned. The projections (62 and 66) of the optic axes of the variable optical retarders are orthogonally aligned so that the response time characteristics of the transitions between optical transmission states of the light gate reflect only the turn-on time response characteristic of the variable optical retarders. A field sequential color display system (78) incorporates a switchable color filter (80) which utilizes the alignment configuration of the variable optical retarders of the light gate to provide light output states of white light and light of three different colors to form an image in full color.

Abstract: Pixel information for a graphics display apparatus is stored in a bit map memory which may be considered as grouped into a number of bit planes corresponding to different separable surfaces or color patterns to be displayed by the apparatus. Information from a computer data bus is written into the proper surface by shifting a predetermined number of bit positions and write protecting information in the bit map memory representing surfaces other than the one it is desired to change.

Abstract: A method and apparatus for measuring characteristics of a component color video signal. In one embodiment the luminance component of a color video signal is applied to the vertical input of a cathode ray tube display device and a chrominance component is applied to the horizontal input. The resultant dots and transitions therebetween produced by the display trace provide an indication of component bandwidth, amplitude and relative time between components. All components can be compared simultaneously by alternately applying one chrominance component with the luminance component, and the other chrominance component with an inverted luminance component. In another embodiment one chrominance component is applied to the vertical input and the other is applied to the horizontal input. Delay circuits are provided for use with a time-division multiplexed video signal to compare time multiplexed components simultaneously. A graticule is provided for relating the display trace to a standard display.

Abstract: A method and system for reconstruction of chroma component segments in a line sequential chroma format television system. Filtering of a received line sequential chroma signal is employed to reconstruct missing chroma components and to attenuate phantom frequency components greater than one half the spatial sampling rate. Digital and analog filters are disclosed for implementation of such post filtering. The luminance component of the line sequential signal is delayed at the transmitter to synchronize the reconstructed chroma segment with its corresponding luminance segment with the use of minimal hardware at the receiver. Horizontal offset chroma sampling is used along with such post filtering to decrease transmission bandwidth requirements without sacrificing horizontal resolution at the receiver.

Abstract: An improved loop coupled YIG resonator has a coupling loop of three sections, a loop section partially encircling a YIG resonator, and two straight end sections. The end sections together with a ground plane enclosing one end of the resonator cavity form a transmission line, the characteristic impedance of which is determined by the distance of the end section above the ground plane. The characteristic impedance is chosen to match the transmission line input to which the coupling loop is connected.

Abstract: A dynamic signal shaper for a cathode ray tube display system is described. In some cathode ray tubes an electromagnetic lens is driven by a correction signal derived from the beam deflection signals. The required correction signal is proportional to the product of the squares of the horizontal and vertical deflection signals. The described signal shaper incorporates means for making the constant of proportionality independently adjustable for beam deflections in each corner of cathode ray tube screen.

Abstract: A device for controlling the output voltage range of a digital-to-analog (D/A) converter of the type wherein the converter output voltage range is proportional to the magnitude of an applied bias current. The device comprises means to sample and store a selected converter output voltage, means to produce a variable current of magnitude proportional to the stored converter output voltage, and a source of constant current. The constant current and the variable current are summed and applied to the converter as the bias current. The converter output voltage range is dependent on the variable portion of the applied bias current which is in turn dependent on the stored, selected converter output voltage.

Abstract: A comparator includes a source degenerated latching differential amplifier and an input differential amplifier interconnected in stacked fashion and connected with the input amplifier having inverting and non-inverting outputs coupled respectively for positive feedback to the inverting and non-inverting inputs of the latching amplifier. Means are provided to limit the relative difference between the signals at the inverting and non-inverting inputs to the latching amplifier so that when the latching amplifier is activated a minimum current will always be present in both sides of the samplifier. Means are provided to selectively apply or not apply a common bias current to the latching amplifier such that on application thereof, the positive feedback from the input amplifier outputs causes the latching amplifier to drive the highest input amplifier output to a high voltage level limit and to drive the lowest input amplifier output to a low voltage level limit.

Abstract: A resonator is initially charged by applying a drive signal offset from the expected resonant frequency of the resonator for a selected period of time. After the drive signal is removed from the resonator a period counter is used to count the period of the output signal of the resonator as it rings down. For low-Q resonators an amplifier is included to amplify the resonator output signal before being applied to the period counter to increase the number of cycles of that signal which are within the dynamic range of the period counter.

Abstract: An integrated circuit package comprises at least two integrated circuit chips each having a plurality of contact pads arranged in a first pattern on the interconnect face of the chip, and an elastic sheet-form interconnect member. The interconnect member has at least two main face areas, associated with the chips respectively, and comprises dielectric material and conductor runs supported by the dielectric material in mutually electrically insulated relationship and having termination points arranged in at least two second patterns at the main face areas respectively and corresponding with the first patterns respectively. The interconnect face of each is in confronting relationship with the associated main face area of the interconnect member, and the contact pads of the chip and the termination points of the associated main face area are in mutually registering relationship. A metallurgical bond is formed between each contact pad and the corresponding termination point.

Abstract: A method for digitally measuring waveforms is provided in which absolute and relative amplitudes and time information of electrical signals is electronically determined. A pair of cursors, which are operable in both independent and tracking modes, are used to provide alignment with reference points and selected measurement points so that the voltage difference between the cursors may be utilized by a digital voltmeter to provide the measurement data.

Abstract: A surface mountable microwave IC package uses printed transmission lines on a printed circuit board in lieu of plumbing between milled packages. A backside co-planar waveguide is connected to a topside microstrip line by a through-hole in a carrier substrate. To compensate for inductance added by the hole and transmission line ends, a gap is adjusted to provide compensation capacitance. Hermetic sealing of the package is assured by brazing a lead frame over the through-hole and using a solder sealed lid. The lid provides both a hermetic seal and shielding.

Abstract: A method of structuring vectorized data obtained by scanning a drawing or other document comprising the steps of displaying on a computer controlled display screen a template image comprising template lines and nodes corresponding to the acquired image data and selecting portions of the acquired image data to be designated for inclusion in a restructured image data set by using a screen cursor to select the corresponding template lines displayed on the screen. Inclusion designations are subsequently and selectively removed as desired from portions of the acquired image data from the structured data set by using the cursor to select the corresponding lines and nodes on the screen. When the desired portions of the acquired data set are selectively designated for inclusion in the restructured data set, all remaining designated data is copied into the restructured image data.