Abstract: A phase multiplexed CCD transversal filter includes N substantially identical parallel-connected CCD's which acquire samples in a predetermined consecutive order over a given clock cycle so that the apparent sampling frequency is equal to N times the clock frequency. The output taps of the CCD's are weighted in a predetermined manner to provide a filter having a predetermined transfer function.

Abstract: A Darlington-connected transistor pair is modified by the addition of a third transistor to form a three-terminal composite transistor wideband amplifier the current gain of which is approximately double that of a single transistor.

Abstract: A method and apparatus for enhancing image details of an object to be recorded. The object, such as the palm of a hand, is bombarded by radiant energy from an ultraviolet light source in such a manner that the object absorbs the radiant energy and emits visible light in the form of fluorescence and phosphorescence. A camera optically scans the object and records image details that have become available due to the fluorescence and phosphorescence. The details of objects having rough or irregular surfaces may be further enhanced by disposing the ultraviolet light source at an angle with respect to the surface of the object so that portions thereof are shaded while other portions of the surface absorb the radiant energy and emit visible light. Appropriate filters may be provided to reduce the effects of extraneous light.

Abstract: A memory preservation and verification system is provided in which memory contents are verified as being valid following an interruption and subsequent reapplication of operating power. A backup power supply is provided to maintain the status of the memory contents during the interruption or loss of a main power supply. First and second mathematically related numbers are generated and stored in memory locations. These numbers are subsequently retrieved and the mathematical relationship therebetween checked to provide the verification of the status of data in the memory.

Abstract: A waveform observing method and apparatus incorporating signal sampling and digital technologies is disclosed. An input signal to be observed is compared with the output from a digital-to-analog converter and the comparison output is used for controlling display means such as a cathode-ray tube. A wideband input signal can be measured with much higher accuracy than the conventional apparatus.

Abstract: A general-purpose oscilloscope system is disclosed wherein waveforms acquired by the vertical and horizontal preamplifier channels can be displayed immediately, or they can be digitized and stored in a memory from where they can be recalled, reconstituted in their analog form and displayed at a later time. The processing system permits simultaneous display of instantaneous and processed waveforms, and includes facilities for processing associated z-axis signals and readout data as well. Access to peripheral equipment, such as a computer or the like, permits the digitized waveforms to be mathematically manipulated and returned to the memory in the processing system for ultimate display. The oscilloscope system can be assembled in a modular manner, whereby the processing unit becomes an integral part of the instrument, or the system can be assembled as a general-purpose oscilloscope without the processing unit, allowing a user to add the processing capability to his system at a later time.

Abstract: An electrical connector apparatus is provided for connection of coaxial transmission lines to etched circuit boards. The apparatus comprises a back plane carrying one or more circuit board edge connectors, a ground plane for engaging a contact on a circuit board plugged into the edge connector, and an arrangement of connector pins which permits most of the edge connector pins to be used for signals while maintaining a high frequency response for subnanosecond pulses.

Abstract: An automatic intensity control circuit is provided for maintaining a constant perceived display brightness in an oscilloscope under varied operating conditions. The circuit includes an averaging circuit, a translation circuit, and a multiplier circuit to develop a cathode-ray tube grid bias control voltage which is inversely proportional to the duty cycle of the time-base sweep gate signal. Two or more such automatic intensity control circuits may be multiplexed for multi-trace oscilloscopes to maintain a constant perceived brightness when alternating between two or more traces.

Abstract: A high performance, wideband instrumentation amplifier includes a main differential amplifier channel which receives an input signal having both differential and common-mode signal components, and a compensation amplifier channel which effectively removes the common mode signal component.

Abstract: A coaxial switch comprising a metallic cylindrical body and cover assembly having a metallic rotor disposed therein includes transmission line portions having a uniform constant impedance characteristic over the lengths thereof. Both double pole, double throw and single pole, multiple throw switch configurations may be provided. The rotor may be driven either manually or electrically.

Abstract: A system for storing waveforms in which each waveform is converted to digital data and stored in a memory sector under the control of a history controller to select the sector and memory counter to select the individual address locations in each sector. When the memory capacity is exceeded, the oldest waveform data is replaced by the newest.

Abstract: An apparent zero delay of a trigger view signal with respect to a normal vertical signal in an oscilloscope is provided by horizontally shifting the trigger view display to coincide with the normal vertical display. This is achieved by injecting a predetermined offset current into the sweep sawtooth output amplifier only when the trigger view signal is being displayed.

Abstract: A digital diagnostic system employs signature analysis for locating faults at the system, module, or circuit component level in electronic equipment. Predetermined correct signatures and diagnostic decision tree information for a particular device under test are stored in system memory. The diagnostic system exercises the device under test to generate signatures which are obtained at various predetermined test points and electronically compared with a stored signature. From the diagnostic decision tree information, a troubleshooting sequence is automatically established which leads directly to a faulty module or component. In-circuit microprocessor emulation may be utilized to generate one or more of the signature signals.

Abstract: An identification system includes means for scanning an identity pattern in a predetermined manner and correlating previously-obtained recognition data with information derived therefrom to determine a positive identification. In obtaining recognition data, the identity pattern is scanned and digitized in a predetermined manner, and then analyzed and sorted to provide prominent information most likely to be recognized in subsequent identity verifications with the original recognition pattern. In this manner, unique recognition data for each identity pattern is stored and is available for rapid retrieval and correlation when the original identity pattern is presented.

Abstract: A high-impedance cascade attenuator device includes a plurality of attenuator stages mounted on a single substrate by means of metallization and thick film processes. The attenuator stages are conventional frequency-compensated voltage dividers designed for high-frequency operation; however, the capacitive compensation is included in the thick film process, and the attenuator components may be trimmed to provide precise impedance ratios so that calibration or circuit adjustments are never required.

Abstract: A cabinet for an electronic apparatus comprises a housing adapted to provide an upright operating position for conventional bench or floor use, and a substantially horizontal operating position for overhead use. The housing includes a control and display panel which is preferably sloped to facilitate user convenience in either operating position. A portion of the housing adjacent the panel is built up to provide an integral handle and means for shading the display from the glare of overhead lights. A detachable hinged cover is provided to protect the control and display panel. Such cover may include accessory items and may provide storage area therefor.

Abstract: A differential amplifier includes an input stage and an output stage which are electrically isolated from each other to permit the input and output portions of the circuit to be operated at different voltage levels. A pair of optical couplers are employed to couple the differential signal from the input stage to the output stage. The output stage comprises a linear gain cell to provide an output signal proportional to the differential signal through the couplers divided by the common-mode signal through the couplers to stabilize gain and minimize D.C. offset drift caused by small changes in physical parameters or temperature.

Abstract: A linear analog multiplier circuit for multiplying electrical quantities comprises a pair of differentially connected nonlinear control devices, for example, transistors, and at least one further semiconductor junction device exhibiting logarithmic characteristics coupled thereto for compensating for the nonlinear properties of the control devices.

Abstract: A method of fabricating a hybrid circuit including a siliceous substrate and thick metal conductors. A thin film barrier layer is provided intermediate the substrate and a vacuum-deposited metal layer, which metal layer is subsequently electroplated to provide the desired metal thickness. The barrier layer, which may suitably be a refractory metal oxide such as the oxides of zirconium, tantalum, titanium, or tungsten, prevents loss of adhesion between the vacuum deposited metal and substrate that occurs during electroplating.