Abstract: There is provided an improved switching arrangement for controlling the interaction of magnetic bubble domain propagation loops in order to provide a large, serial storage loop which is fault tolerant and has improved operating characteristics. The switch provides on-chip correction capability and, as well, enhanced switching capability to render defective loops or propagation path portions separable in a positive manner.

Abstract: A monolithic multiple magnetic layer composite comprising a substrate of a magnetic-wave-inactive material and a layer of magnetic-wave-active material deposited on each of the two opposing sides of the substrate. The composition and, consequently, the internal magnetization of each layer of magnetic-wave-active material is different from that of the other layer. The composite can be used in a magnetostatic surface wave delay line having a ground plane and means for providing a uniform bias magnetic field for the composite. Along with the geometrical parameters of the composite and the delay line, the internal magnetizations of the two layers of magnetic-wave-active material are preselected to provide a time-delay versus frequency characteristic for the delay line which is either approximately linearly dispersive or nondispersive.

Abstract: A knob adapted for mounting on a control shaft of a control device permits push-pull and rotary functions of the device to be selected. A rotatable skirt section through which the shaft extends covers unselected indicia on a display panel. A window on a portion of the skirt permits only a selected indicia to be seen. Upwardly extending arm members are attached to the skirt section, and are slidably received within channels of an overlying knob section. The overlying knob section is slidable upwardly and downwardly upon the upstanding arm members, but engages the arm members when the knob is rotated to facilitate rotational selection of the control functions. A spring biasing means is provided to maintain the skirt portion in a position adjacent the display panel to reduce the escape angle from under the skirt of light which may be provided within the display panel to illuminate the indicia, and to reduce paralax in viewing the selected indicia.

Abstract: A circuit for generating a smooth signal for use in linearizing an ARINC specified radio altimeter signal, includes an operational amplifier circuit having a piecewise linear transfer function. A time varying periodic signal is added to the radio altimeter signal at the input of the amplifier circuit, and the signal thus produced is filtered to thereby generate a smooth, linear representation of the altimeter signal. In one embodiment, the smoothed signal is differentiated to generate a signal representing the rate of change of the smoothed, linear signal, or altitude.

Abstract: This is a consolidated memory element allowing two simultaneously occurring independent accesses to take place. As disclosed, the apparatus contains both a random address mode and a sequential address mode to allow the simultaneous modes of (1) random read/sequential read, (2) random read/sequential write, (3) random write/sequential read.

Abstract: A method and apparatus for independently controlling a CWFM radio altimeter to reduce interference from another nearby altimeter employs a high-Q filter outside the bandpass of the signals which are developed and decoded for altitude indication to detect an approaching interference signal received from the other altimeter and produce an output to a threshold detector. When the output of the filter exceeds a predetermined level, the threshold detector causes the transmitted frequency of the altimeter to be stepped.In one embodiment, a digital counter is provided to cyclically count up and down at a desired sawtooth modulation frequency. The output of the counter is applied to a digital-to-analog converter to produce an output used to control the frequency of the transmitted signal. Additionally, the output of the counter is conducted to inputs of an adder having a preset add number therein.

Abstract: Apparatus for controlling the data exchange among redundant computation channels for use such as in a digital flight control system includes a register into which a tic is entered when selected data is written into a main memory, the position of the tic in the register corresponding positionally to the address of the main memory at which the data is being written. Subsequently, the tic containing register is searched, and when a tic is found, the data is retrieved from the main memory. The data thus retrieved is multiplexed in sets with raw sensor data and transmitted to the other redundant channels in serial format. The tic register in one embodiment is a RAM addressable concurrently with the main memory.

Abstract: In a laser gyro, laser optics adjustment means comprising a mirror within the laser optics of the gyro and mounted upon a three-terminal duo-mode bimorph device for duo-mode modulation of the laser optics. A two-stage differential amplifier is responsively coupled to a source of two mutually phase-coded reference signals for separately dithering each mode of the duo-mode bimorph device, each stage being further responsive to a mutually exclusive one of a first and second synchronously detected photodetector output of the laser gyro whereby closed loop control of the laser optics is effected.

Abstract: There is described a bubble domain field access device component for providing continuous generation of a stream of bubble domains. The device is in the nature of a passive generator which is preferably constructed using one-level processing. The device uses multiple chevrons (chevron columns) which have the advantages of inherent redundancy, reduced gap tolerances and wide propagation margin. The structure comprises, generally, a rectangular seed plate arranged as a 90.degree., multiple-chevron, corner portion.

Abstract: A system for detecting one or more keywords in continuous speech is disclosed wherein a speech processor extracts a plurality of analog speech parameters from the input continuous speech, an STV (Spectral Time Vector) generator circuit selectively converts the plurality of analog speech parameters into digitized spectral parameters, an asynchronous correlation circuit continuously correlates sequences of the digitized spectral parameters with stored reference mask templates representative of subelements (dyads or triads) of one or more desired keywords in order to produce continuous correlation data, and a decision function circuit is responsive to the correlation data for developing an occurrence decision output for each desired keyword that is detected.

Abstract: A passive replicator comprising a plurality of elongated bars interposed between an input propagation path and a plurality of output propagation paths.

Abstract: An intensity control system for a cathode ray tube (CRT) is disclosed. The system provides precise intensity control for a CRT whose control characteristics are only slowly varying. Precise intensity control is provided by measuring the cathode ray tube beam current. The beam current is set at a desired value without producing an image on the tube face. Thus, tube intensity can be set without fogging photoresponsive media which is in position for exposure by images on the cathode ray tube screen. The intensity may be set to a value determined by a manually adjustable intensity control. The intensity is preferably set by iterative threshold comparison of the actual beam current with the value corresponding to the setting of the intensity control. A unique threshold comparison circuit provides precise comparison between the reference level set by the intensity control and the actual beam current.

Abstract: Noise such as hum (whose components are self-correlated over a long time-interval) is estimated (separated) from Signal such as speech (whose components are self-correlated only over a short time-interval) by using a time-domain transversal filter, whose tap-weight coefficients may be fixed (Wiener filter) or variable (Adaptive filter). A combiner combines the estimated noise and original input signal to develop an output speech signal free of noise. The output speech may by further applied to a spectrum shaper to restore a natural shape.

Abstract: Single crystals consisting of various compositions from the quaternary silicate system Al.sub.2 O.sub.3 --CaO--MgO--SiO.sub.2 are grown from the melt. The physical and chemical properties of the single crystal silicates, including akermanite (Ca.sub.2 MgSi.sub.2 O.sub.7), cordierite (Mg.sub.2 Al.sub.4 Si.sub.5 O.sub.18), and mullite (Al.sub.6 Si.sub.2 O.sub.13), make the silicates useful, for example, as substrates for epitaxial semiconductor films.

Abstract: An improved dynamic logic gate compatible with a four-phase, major-minor clocking scheme and a six-phase metal oxide semiconductor (MOS) system. The gate evaluates only during an in-between clock phase, which phase corresponds to the interval of time between the occurrence of first and second major clock phases.

Abstract: There is provided an efficient semi-transparent reflector (transflector) which reflects direct light under normal, ambient light conditions but permits back lighting of a display, such as an LCD display, under dark ambient light conditions. Such a "transflector" is inexpensive to manufacture and provides an efficient device in which the pattern and body color of the reflector can easily be changed.

Abstract: An adjustable digital filter combines the functions of a conventional digital filter and a conventional equalizer and permits elimination of the additional delay stages conventionally required for the equalizer. Reduced complexity and expense are attained, along with improved performance, since the elimination of "delay-and-add" stages required by prior art equalizers permits detection and correction of error with less delay than the prior art. Hence, improved performance is realized along with reduced cost.

Abstract: A digital character generator method and system encode characters based on a normalized quad in accordance with coordinates of initial starting points of outlines of the character and variational parameters defining changes in those outlines such as slope and curvature. All characters of all formats are encoded for a maximum point size display. Vertical scaling factors permit character generation at any desired point size display. Horizontal scaling factors are employed both for transforming computations based on the encoded parameters for the normalized quad to a desired point size of display and also to adapt cyclic computations to the stroking density of a display CRT.

Abstract: Monolithic acoustoelectric signal storage device and means for generating a surface acoustic wave on piezoelectric material and propagating the wave into a storage region of the device. An electric field applied across a storage structure in the storage region of the device interacts with the electric field associated with the surface acoustic wave to produce a holographic replica of the wave in a spatially varying distribution of charge trapped at a solid dielectric-dielectric interface. The stored waveform may then be read out at a later time or, in nonlinear signal processing applications, the electric field of a subsequently generated surface acoustic wave may be propagated into the storage region to interact with the trapped charge to produce an output signal.

Abstract: An MOS device and a method for making such device where an insulating layer over the gate region is formed at critical temperatures results in hardening the device against high energy particle and electromagnetic radiation effects. A layer of chromium on top of the gate insulating layer is used to enhance the hardening, and diffusion of a portion of the chromium layer into the insulating layer maintains a high degree of control over ionization damage.