Abstract: The error-checking scheme disclosed herein is adapted for use in digital data processing systems, e.g. computers, in which binary data is variously transmitted and/or stored and in which the data source or destination is designated by a binary address. In a preferred embodiment, the data is divided into two fields and a respective parity bit is generated corresponding to each data field. Each data parity bit is then combined with a parity bit corresponding to the binary address to yield a respective combinational parity bit. Each of the resultant combinational parity bits is then sourced with the respective data field. Accordingly, a system sub-component receiving the sourced data with the combinational parity bits can detect any type of single error occurring in either the address or the data.

Abstract: A means and method for generating random permutations on a square having k.sup.2 subsquares based upon a circuitry including a maximal-length sequence generator.

Abstract: A digital correlator which will detect a digital pattern in the presence of noise. In an n bit pseudo-noise (PN) sequence, comparison is made of the input word with m desired PN coded word patterns; a flag is raised when a pattern is detected and identified. In one embodiment all possible (six) PN code words are programmed in a ROM (Read Only Memory). The input word is compared with all six code words in a parallel sequential search mode. In another embodiment, comparison is made of a 31 bit input word with a programmed PN code word in a single parallel comparison.

Abstract: A comparator formed of complementary MOS gates. A variable-fixed word comparator for a word length of N-bits requires only N pairs of complementary MOS devices. A variable-variable word comparator for a word length of N-bits requires only 2 N pairs of complementary MOS devices.

Abstract: An error correction system is provided for a random access memory system of the magnetic core or plated wire type, and which serves to render the memory system immune to the effects of nuclear radiation, and the like. The system of the invention includes circumvent circuitry which serves to limit all currents in the memory access network to safe values during a radiation event, so as to pevent burn-out of the memory and of its associated components. The system of the invention also serves to correct single word errors which can occur to words being written or read during the radiation pulse. The single word error correction is achieved in a first embodiment of the invention by partitioning the fixed data program words in the memory into blocks; by providing an error correction word for each such block, and by reconstructing from the error correction word, the word being read or written during the radiation pulse.

Abstract: A system for controlling the position of a movable element, such as a microscope slide in one embodiment thereof, which system includes a unique high resolution digital-to-analog converter which converts a digital command signal to an analog servo input command for moving the element along an arcuate path in two orthogonal directions and for moving the element in a third orthogonal direction along a linear path. The unique digital-to-analog converter which would be broadly useful in many different applications includes means responsive to selected combinations of the most significant bits of a digital input signal for supplying equally weighted selected combinations of a reference signal and responsive to selected combinations of the least significant bits thereof for supplying binary weight selected combinations of the reference signal, the equally weighted binary weighted combinations being combined to produce the analog output signal.

Abstract: A night visual aircraft system receives flight data from an aircraft simulator, and ground light data from the gaming area data base. A computer within the night visual system organizes this image data by frame in a buffer memory according to a particular format of addresses, sequences, and bit places. The following types of image data are uniquely positioned in the format:A position vector (Vp), defining the changing position of the aircraft with respect to the terrain data origin.Rotational matrix data defining the changing attitude of the aircraft with respect to the axes of the terrain coordinate system.Light source position data defining the position of terrain lights with respect to the origin of the terrain data.Cif data, defining the direction, color, intensity, option code, and defocus (size) of individual lights.

Abstract: The Ships Navigation Aircraft Inertial Alignment System (SNAIAS) Digital t Set checks-out the data link navigation messages between the shipboard navigation system and the aircraft inertial alignment system. The test set monitors alignment and waypoint data, and provides a go/no-go indication of the adequacy of the data. The set receives transmitted UHF data by means of a receiver, or hardwired data from the Alignment Outlet Boxes (AOB) via a cable connector. SNAIAS can also monitor data at other hardwired points along the data distribution path. The test set monitors either the AOB data, the RF data, or sequentially monitors each. The set can generate its own data, inject it into the data path, and monitor the system outputs.

Abstract: In a dynamic disc memory system, servo signal tracks and data tracks are adjacent. The servo track includes a signal having a predetermined frequency. With the system and method of this disclosure, the data recorded on the data track is translated to have a frequency null at the frequency of the servo signal track by translating apparatus to eliminate cross-talk at the servo frequency.

Abstract: A digital circuit for generating an error correction or otherwise characterized signal having a value which changes in accordance with a second signal such as the speed of an airplane (MACH). As a specific example, the generated signal is indicative of the error correction required to the static and derived pilot tube pressure signals which error correction changes non-linearly with respect to the velocity of the airplane. Since, in general, each type of airplane requires its own special correction signal, the apparatus must be readily alterable to a given specific application.

Abstract: A traffic control system having a number of detectors spaced along a roadway being monitored. The detectors are organized in groups, each group being interconnected to a different post. The posts include transmission and reception equipment for communicating with the detectors of that group. A transmission line system has a number of sections with a single section corresponding respectively to a single group of detectors. The sections of the transmission line system are also respectively coupled to the posts. The posts are also organized into groups, each group being interconnected to a control computer. All the control computers are connected to a central computer and an operating center. The various computers can be set to control the traffic in response to the information detected. Also, communications can be carried out, both in code and in clear, between the vehicles using the roadway and the computers or the operating center.

Abstract: Iterative units of an array are programmed for selected processing functions, for unit testing, and for avoidance of defective units, by loading mechanisms which permit a unit to be programmed and then to extend a loading path to an adjacent unit, so that loading paths may be established directly from unit to unit, with the loaded units serving as wires to transmit loading information to a unit to be loaded. After loading, the loading paths may be retracted (disconnected) leaving the loaded units in condition for the performance of desired processing functions. For example, the loaded units may form one or more shift registers, may serve as wires for transmitting test signals to and from a unit to be tested, and may be arranged to avoid defective units.

Abstract: A programmable sequence controller is disclosed which includes a controller memory having at least one read-only memory unit for storing a sequence program comprising a series of instructions each including an operation code and address information. An operation control device is also provided for examining an external input in accordance with an appropriate instruction. An input network permits application of external inputs designated by the address information to the operation control device, and an output network is provided for transmitting a control signal based on the examination result from the operation control device. A program input network including a read-write memory is provided for storing a part of the sequence program, which part is loadable in one read-only memory unit.

Abstract: A control store system provides for automatic detection of errors produced by faults in the circuits of the system during both normal and test operations. The system includes a control store and associated address and control circuits. The address and control circuits include a plurality of control address registers and an incrementing circuit. Each storage location of the control store includes a previously generated parity check bit which represents odd parity for the address corresponding to the next sequential storage location. Each of the control registers couples to a parity check circuit. Each time the contents of a storage location within the control store memory are accessed, the parity check circuit of the register receiving the address contents produced by the incrementing circuit is checked for odd parity to determine whether the information accessed is correct and whether the incrementing circuit, the registers, and associated paths are free of faults.

Abstract: The present invention relates to an apparatus and method for converting an nalog, two dimensional rectangular coordinate input into a digital output measured in range and bearing.

Abstract: An approximation is made in the equation for the desired vertical profile command signal to control the altitude of a drone traveling towards a target such that simple analog circuitry may be utilized instead of complicated computers.

Abstract: The combination of a vehicle such as a tractor having at least one actuatable operation-performing element; a device for monitoring the operational status of the element; and a stored program digital computer including a storage unit and a control unit. The control unit functions by receiving status information from the vehicle and control information from the stored information to supply control instructions to each actuatable element during operation of the vehicle.

Abstract: A submarine cable laying system having an underwater cable laying device towed by a cable laying ship along the sea bottom is disclosed. The underwater cable laying device comprises a cable depressing wheel, a mechanism for elevating and lowering the cable depressing wheel, means detecting passage of repeaters and the like under said cable depressing wheel, and means for detecting the length of a part of the cable having been laid by the cable laying device. The output signals of the two detecting means are sent to a controlling device provided on said cable laying ship, and are so processed that the output signal from the controlling device can control the elevation or lowering of the cable depressing wheel automatically each time the repeaters or the like pass through the cable depressing wheel.

Abstract: Data generally representative of presumed noise in an environment are colted and compared with data from one or more statistically symmetric observations of a selected portion of that environment. The data are ranked in order of magnitude and the rank order is stored in a shift register by associating one of two values to each datum according to its source. A plurality of register outputs are combined in summers to produce a representation of the rank order in terms of a complete orthogonal set of functions corresponding to the two-valued function stored in the register. A plurality of adjustable weight function multipliers are associated with the summers, their values having been determined according to statistical assumptions as to the nature of the underlying suspected signal and presumed noise. The outputs of the multipliers are summed and then are compared to a pre-determined threshold value, indicating the presence or absence of signal in the selected portion of the environment.

Abstract: Measurements of physical attributes such as dielectric film thickness that are susceptible to spectral analysis are accomplished rapidly and accurately by a spectrophotometric system in which a programmed digital computer operating concurrently with the optical scanning means automatically performs the calibrating, normalizing and data reducing functions that otherwise must be carried out as time-consuming human, mechanical or analog electronic operations. The control over the optical data handling operations exercised by the computer eliminates the need for mechanically or electronically adjusting the optical apparatus to meet changing system conditions, whether periodic or aperiodic.