Abstract:
Described is a crossbar having a return network of switches arranged and connected in a manner so as to return messages which encounter blocked message pathways. It is particularly suited to truly non-blocking network designs, which are also described.
Abstract:
An integrating analog-to-digital converter system in which alternating and different combinations of signals are integrated, and which are selected for such integration both periodically and through an integrating result reaching a reference value in the periods. A digit count is provided as a system output indicating the time duration of integration of a selected signal combination in each period.
Abstract:
The output of a condition sensing bridge is linearized by providing a feedback from the output to the bridge supply which feedback is in the linear form of VB = KVO + VX where VB is the bridge supply voltage, K is a proportionality constant, VO is the bridge output and VX is the feedback offset voltage.
Abstract:
A contrast enhancement filter (24) for color displays, particularly adapted for color CRT tubes (10) of the shadow mask type. A transparent plate (40) has applied thereon absorptive areas (42), each area dyed with a primary color corresponding to the color dots (46) of the CRT display face and a plurality of such color areas (42) randomly disposed over each color dots (46). Since the absorption areas (42) are spacially independent, each color area (42) acts independently of the others. The filter (24) provides bandpass efficiency comparable to monochrome filters, and has a broad viewing range essentially independent of angle of vision. In a further embodiment, colored oriented fiber-optic elements (58, 60, 62) are disposed over the phosphor dots (50, 52, 54) in a predetermined array, allowing the filter plate (56) to replace a conventional faceplate and filter combination structure, while providing a selective viewing angle of high contrast. The filter (24) is suitable for any light-responsive display screen, also including liquid crystal elements.
Abstract:
The vector generator employs a digital accumulator for each vector component. The accuracy of generated vectors is optimized by presetting the fractional portions of the accumulators to a value of either 1/2 or to 1/2 less 1 LSB. Accumulation of errors over concatenated vectors is eliminated by employing high enough fractional resolution relative to the maximum vector length so that error accumulation on any single vector is limited to the fractional portions of the accumulators, and by setting the fractional portions of the accumulators, on the last clock cycle of each vector, to a value of 1/2 or to 1/2 less 1 LSB. Also, by setting/presetting the fractions to only 1/2 less 1 LSB, and by enabling the carry input to a given accumulator on only the first clock cycle of vectors that have certain orientations, then symmetry is forced or favored in complex symbology that is generated by concatenated vectors.
Abstract:
L'invention concerne un procédé et un appareil permettant d'obtenir un réseau amélioré de détecteurs. Les détecteurs sont connectés électriquement d'un substrat à un autre par l'intermédiaire de connexions à "bosse" avoisinantes. On évite qu'ils subissent une distorsion lors du durcissement d'une résine époxy unissant les deux substrats en plaçant les détecteurs de sorte que l'époxy ne coule pas adjacente aux détecteurs.
Abstract:
A cold shield for an array of detectors of predetermined shape comprising a first cover of radiation blocking material formed with parallel rows of apertures and lying a first distance away from the detectors and a second cover of radiation blocking material formed with a plurality of apertures of generally the predetermined shape therethrough and lying a second distance, smaller than the first distance, away from the detectors so as to minimize background radiation from reaching the detectors while permitting desired radiation approaching the array from any of a plurality of angles to reach the detectors.
Abstract:
In order to insure the accuracy of information transmitted over a network, the initiation of the message must be unambiguously identified. In the present invention, the intermessage spacing consists of a series of identical logic signals that exceeds a minimum value distinguishing this interval from a message character. The message character has predefined length, with a start bit position and a stop bit position logic signal bounding the character that have the same predetermined logic signals for every message character. The character has at least one additional non-data bit position that has a first logic signal for the initial character of a message and the complementary logic signal for the remaining characters in the message.
Abstract:
A fixture for assisting in determining the location of a center of gravity of a torpedo, including a cradle (11) suspended pendulously in a base (10) or a support. The cradle has a pair of rollers (23, 24) grooved to receive the torpedo, and provided with means (27) for manually rotating the rollers to displace the torpedo axially until the cradle becomes level in the base when the location of the center of gravity may be observed or marked on the torpedo.
Abstract:
An inertial control system for providing vertical velocity and vertical position information for an aircraft is described. Vertical velocity is determined as a function of vertical acceleration of the aircraft and a correction signal. The vertical acceleration correction signal is derived from a function of the barometric altitude and an altitude error signal. The altitude error signal is derived from the difference between the inertially determined vertical position and the barometric altitude. The vertical acceleration correction signal is derived from the altitude error signal and its integral multiplied by variable values which are a function of the time differentiation of the barometric altitude. Vertical position of the aircraft is determined as a function of the derived vertical velocity corrected by a vertical velocity correction signal.