Abstract: A low distortion light source comprising a light emitting diode and a compensating diode connected in parallel with respect to a D.C. bias current and in anti-series with respect to an A.C. signal source. The compensating diode is selected to have a forward resistance similar to the forward resistance of the LED. Adjusting the D.C. bias current through the diodes to be approximately equal matches the forward resistance characteristics and substantially reduces the undesired intermodulation products.

Abstract: A television picture on a television test and measurement instrument adds a vertical sweep generator, and if necessary a horizontal sweep generator, to a conventional instrument. Vertical and horizontal sweep triggers are generated by a sync processor of the instrument from an input video signal to drive the respective sweep generators. A vertical sweep signal from the vertical sweep generator is input to a switch together with the input video signal. The output of the switch drives a vertical deflection circuit such that when the input video signal is output from the switch the instrument is in standard waveform monitor mode, and when the vertical sweep signal is output from the switch the instrument is in a picture mode to provide a raster scan image of the input video signal on a display.

Abstract: Dimensioned sketches are analyzed using graph theoretical concepts to determine whether dimension constraints are sufficient to define unique geometry and are nonredundant.

Abstract: A two phase shift register comprises four serial registers each having an input section, a transfer section, and a lead-in section disposed between the input section and the transfer section. The input sections provide respective sequences of charge samples, the four sequences being offset in phase relative to each other by 90.degree. within the cycle of a clock signal. At least one of the serial registers comprises a first lead-in gate pair and a second lead-in gate pair over the lead-in section, the second lead-in gate pair being between the first lead-in gate pair and the transfer section. The first lead-in gate pair and the second lead-in gate pair are each driven at the frequency of the clock signal, the drive signal applied to the second lead-in gate pair being retarded in phase relative to that applied to the first lead-in gate pair by 90.degree. within the cycle of the clock signal.

Abstract: A probe for testing a circuit board having a plurality of test points distributed in a predetermined pattern over a main surface of the board comprises a locating member having a plurality of passages therein, the passages being distributed in a pattern corresponding substantially to the predetermined pattern. Probe elements extend in the passages respectively, the probe elements being movable independently of one another in the respective passages. Flexible conductors are connected to the probe elements. When the locating member is in confronting relationship with the main surface of the circuit board and the passages are in register with the test points and pressure is applied to the probe elements, the probe elements are brought into pressure contact with the test points.

Abstract: A sample and hold network is provided having an analog multiplier that multiplies the analog input signal by a sinusoidal strobe signal to produce a multiplied signal. The multiplied signal is filtered by a bandpass differentiating filter and is combined in a differential amplifier with the analog input signal to yield a periodically sampled and held version of the analog input signal. The bandpass differentiating filter attenuates or eliminates undesirable DC and frequency components.

Abstract: A memory device having a plurality of addressable memory locations, each of which can be defined uniquely by an address having an X component and a Y component. The locations correspond respectively to grid points in a rectangular array at a pitch dX in the X direction and a pitch dY in the Y direction is loaded with data values at locations corresponding to grid points lying substantially on a line from a location (X.sub.0 +e*dX, Y.sub.0 +f*dY) to a location (X.sub.0 +p*dX, Y.sub.0 +q*dY), where X.sub.0, Y.sub.0) is a grid point and e, f, p, and q are integers. The memory device is loaded by a method which includes(a) setting s=floor (p/q)______________________________________ PInc = p - sq -q NInc = p -sq AErr.sub.0 = PInc ______________________________________(b) for each value of i in the range from 0 to q-1, executing ______________________________________ If AErr.sub.i >= 0 then X.sub.i+i : = X.sub.i + (s + 1)dX AErr.sub.i+1 : = AErr.sub.i + PInc else X.sub.i+1 : = X.sub.i + sdX AErr.sub.

Abstract: Removal of dissolved copper from solution according to the present invention involves treatment of waste solutions such as electroless copper overflow solutions with aluminum particles under reaction conditions promoting precipitation of dissolved copper from solution as metallic copper. Copper plating solutions having high concentrations of dissolved copper are inactivated in overflow reservoir (12) by addition of an inactivating agent from reservoir (14) to prevent plating of metallic copper onto vessels and conduits during collection, storage and/or transport of the solution. Inactivation of the copper plating solution is followed by precipitation of dissolved copper from solution as metallic copper in reaction vessel (20) by addition of aluminum particles from reservoir (24).

Abstract: An interferometer comprises an optical system for generating an interference pattern of a predetermined configuration in a focal plane of the interferometer, and a detector device for measuring the distribution of optical power over the focal plane. The detector device comprises a body of semiconductor material having first and second opposite main surfaces, one of which surfaces lies substantially in the focal plane of the interferometer. The body of semiconductor material has a region of a first conductivity type and a channel of a second, opposite conductivity type at the first surface thereof and bounded by the region of the first conductivity type. The configuration of the channel conforms substantially to the predetermined configuration of the interference pattern. The semiconductor material responds to electromagnetic radiation in a given spectral region by generating charge carriers. Charge carriers that are created in or diffuse into the channel are confined in the channel.

Abstract: Segments of memory are allocated to a stack cache as needed to accommodate additional continuation frames during execution of a program. When a continuation is captured, flags in all segments of the stack cache are set to indicate the signals are shared by a captured continuation, the top segment of the stack cache is copied, and the copy is made the top continuation frame of the stack cache. To invoke a continuation, the top segment of the invoked continuation is copied into the current stack cache segment. When the stack cache is ready to underflow into a segment shared by a captured continuation, the shared segment is copied and the stack cache underflows into the copy.

Abstract: A data transfer synchronization method and circuit allows data to be transferred between two synchronous systems running asynchronously with each other in a way that does not require the receiving system clock to be running twice as fast as the source system clock. Data is clocked into a first set of flip-flops by the clock signal of the source system. The source system clock signal is also used to toggle a toggle flip-flop. The receiving system clock signal is used to clock a first clock bit flip-flop coupled to detect the state of the toggle flip-flop. A delayed version of the receiving system clock signal is used to clock the output of the first set of flip-flops into a second set of flip-flops. The normal (undelayed) receiving system clock signal is used to clock the output of the second set of flip-flops into a third set of flip-flops.

Abstract: X-ray attenuating polycrystalline ceramic materials having at least 20 wt. percent cerium oxide are disclosed. In addition, the materials can include one or more X-ray attenuating substances selected from the group including compounds of strontium, zirconium, yttrium, niobium, molybdenum, neodymium and tungsten. The materials can be formed in strong, non-porous bodies such as cathode ray tube funnels.

Abstract: A plate-like body (e.g., a silicon wafer) at least about 0.5 mm thick that is to be thinned is reinforced by applying to one main surface, in adhesive relationship thereto, a coating of a finely divided material which is fused to form a hard mechanically supportive coating. The body is thinned from the second main surface to a thickness less than about 250 .mu.m. For a silicon body, the mechanically supportive coating comprises at least about 18% silicon.

Abstract: A signal processing method for identifying the type of a stored, digitized acquired signal according to a selected operating mode applies a hierarchy of tests to the stored data. The tests applied are determined by the selected operating mode--SPUR, PULSE or CW. Tests for threshold and width are applied in all operating modes, tests for left and right maximum values are applied in the PULSE mode, and a bandwidth test is additionally applied in the CW mode. Thus other signals than CW can be identified.

Abstract: A print medium sheet feeding system for an ink jet printer having a print head with a planar array of jets is provided by clamping the leading edge of a paper after it is passed through a printing zone to a rotating assembly of parallel disks. The sheet is pulled through the printing zone by rotating the disk with the clamp being carried with the rotating drum. A platen may be provided which has a flat surface in the printing zone forming a tangent to the outer surface of the rotating disks. Alternatively, the platen may be removed and the sheet held in tension between the clamp and a nip region formed by a spring plate held against a restraining plate. In an alternative embodiment, the sheet is initially clamped against the drum by the combination of a lever arm which is selectively engageable with the drum for rotation therewith and an attached actuating arm having a plate which secures a sheet to the drum surface.

Abstract: A display system comprises a data base memory for storing data representing a picture, a display device for displaying the picture, and manipulation means for causing the display device to display a cursor at a position which is under user control. The picture is composed of objects and each object is represented in the data base memory by a segment which represents both the object and the position of the object in the picture. A pointer, which divides the address domain of the display device into at least two regions, is generated. The manipulation means provides a signal which identifies the region of the pictures in which the cursor is positioned, and this signal is compared with the contents of the data base memory to facilitate selection of an object which lies in the identified region of the picture.

Abstract: A motion controller for the head carriage of an ink jet printer comprises a target signal generator providing constant velocity reference input to a servo loop controller. Also, two levels of current are applied to the drive motor during direction reversal, a lower one during deceleration of the carriage, and a higher one during acceleration of the carriage. The timing of the two current levels is determined by inputting a rectified velocity signal into a slope detector. A comparator converts the output of the slope detector into a binary signal for controlling the motor current level.

Abstract: A temperature-compliant tube for fiber optic components is inserted into the exit port of an hermetically sealed package and extends into the interior of the package. An optical fiber extends through the temperature-compliant tube and is attached to a substrate interior of the package for coupling to an optical component mounted on the substrate. The optical fiber is hermetically sealed to the interior end of the temperature-compliant tube. The thermal coefficients of expansion and lengths for the temperature-compliant tube, the optical fiber between the substrate and the interior end of the tube, and the package body between the substrate and the exterior end of the exit port are tailored to provide zero differential expansion to enable the fiber optic components to be cycled over a wide temperature range without misalignment of the fiber relative to the optical component or mechanical failure of the fiber.

Abstract: A circuit board is fabricated from first and second composite sheets, each composed of a substrate of dielectric material and at least one conductor run adhered to the substrate. The substrate of the second composite sheet is formed with a through hole adjacent to the conductor run of that sheet. The second composite sheet is adhered to the first composite sheet, with the conductor run of the first sheet exposed through the hole in the second sheet. Conductive material is introduced into the hole and provides an electrically-conductive connection between the conductor runs of the two sheets.

Abstract: A mounting and aligning apparatus for a fiber optic cable is formed of segments interconnected by integrally formed shoulders that are rotated with respect to each other so as to be orthogonal. Apertures are formed in each segment normal to the surfaces of the segments and co-existent with a central axis for insertion of the fiber optic cable. The integrally formed shoulders are stressed past the elastic limit of the material used to produce a starting bias point for the adjustment of the fiber optic cable. Machine screws are used to open and close the relative distance between adjacent segments thereby permitting the alignment of the fiber optic cable with a source of laser light.