Showing papers on "Offset (computer science) published in 1971"

Moiré Contour-Sum Contour-Difference, and Vibration Analysis of Arbitrary Objects

Abstract: A grid is projected onto an object and focused into a viewing camera which is offset from the angle of illumination. When the image is superimposed by double exposure or by filtering with the image of another object, contour-difference moire fringes appear. By the use of two offset projectors, measurements of contour sums or contour doubling may be accomplished. The properties, limitations, sensitivity, and procedures are analyzed and discussed. The method lends itself to image enhancement and is extended to the study of vibration analysis in real time. In the latter application, time-average moire fringes appear according to the zeroth-order Bessel function, which contains the modal amplitude function in its argument.

Redundant offset recording

Abstract: Information is recorded on a record medium for recovery without loss due to a defect of the medium by recording the same information in each of two tracks with a longitudinal offset; and upon detection of an error while reading from one track, switching to reread the same item of information from the other track.

Real-time network decomposition and subnetwork interfacing

Abstract: NEW METHODS OF DECOMPOSING NETWORKS AND INTERFACING THE RESULTING SUBNETWORKS ARE BEING DEVELOPED AS PART OF THE CONTINUING RESEARCH AND DEVELOPMENT EFFORT TO IMPROVE REAL- TIME URBAN TRAFFIC CONTROL. THE BASIC CONCEPTS AND ALTERNATIVES ARE INTRODUCED IN THIS PAPER. NETWORK DECOMPOSITION MAY BE REQUIRED WHEN THE NETWORK GEOMETRY IS NOT UNIFORM AND/OR WHEN THE TRAFFIC CHARACTERISTICS WITHIN AN AREA ARE NOT UNIFORM. DECOMPOSITION IS NOT SUCCESSFUL UNLESS TWO TASKS ARE ACCOMPLISHED: (A) SUBNETWORK DETERMINATION ACCORDING TO CERTAIN CRITERIA AND (B) INTERFACING THE VARIOUS SUBNETWORKS. THE TWO GENERAL WAYS IN WHICH SUBNETWORKS MAY BE DEFINED ARE FIXED DEFINITION AND REAL-TIME SUBNETWORK DEFINITION. FIXED SUBNETWORKS ARE DEFINED FROM GEOMETRICAL AND OTHER CONSIDERATIONS. REAL-TIME SUBNETWORK DEFINITION IS BASED ON TRAFFIC DYNAMICS. TO DEFINE SUCCESSFULLY SUBNETWORKS IN REAL TIME, TWO ELEMENTS MUST BE PRESENT: (A) A CRITERION BY WHICH IT CAN BE DETERMINED THAT AN INTERSECTION IS A "CANDIDATE" FOR CONSIDERATION AS PART OF A SEPARATE SUBNETWORK AND (B) A PROCEDURE BY WHICH THESE CANDIDATE INTERSECTIONS CAN BE GROUPED INTO A WORKABLE SUBNETWORK. THE PROPOSED CRITERION FOR CANDIDACY IS OFFSET ERROR -THE DIFFERENCE BETWEEN A REALIZABLE AND AN IDEALIZED OFFSET. AMONG THE GROUPING PROCEDURES ARE TWO GENUINELY REAL-TIME METHODS (RECTANGULAR SUBSET AND CONNECTIBLE SET) AND ONE PSEUDO REAL-TIME METHOD. INTERFACING SUBNETWORKS CAN BE A DIFFICULT TASK. IN THE SPECIAL CASE WHERE THE TWO AREAS HAVE THE SAME SIGNAL CYCLE, INTERFACING IS ACCOMPLISHED VIA A "DELTA OFFSET." THIS DELTA OFFSET IS A VOLUME-WEIGHTED AVERAGE OF THE OFFSET CHANGES DESIRED ACROSS THE INTERFACE. WITH UNEQUAL CYCCLES, A MATCHING AND RESYNCHRONIZATION TECHNIQUE MIGHT BE EMPLOYED, OR INTERFACING CAN BE ACCOMPLISHED THROUGH A TRANSITION ZONE WHERE THE SIGNALS ARE TRAFFIC-ACTUATED RATHER THAN OPERATED ON ANY SPECIFIC CYCLE. /AUTHOR/

Offset-compensated emitter-follower

Abstract: A simple voltage-follower circuit is described. It is essentially an emitter-follower, whose offset voltage between input and output terminals is of the same magnitude as the input offset voltage of a bipolar integrated differential amplifier.

Offset feed control

Abstract: This disclosure describes a hydraulic feed control for reciprocative machines which rotate and feed a tool-bit into a workpiece.

First Slip Times Versus Static Phase Error Offset for the First- and Passive Second-Order Phase-Locked Loop

Abstract: Static phase error offsets occur in first-order and passive second-order phase-locked loops, whenever the rest frequency of the local oscillator and the carrier are different prior to acquisition. The effect of the offset is to degrade performance and in particular to decrease the mean time to first slip. This paper studies first slip times via computer simulation. The mean time to first slip is displayed graphically as a function of signal-to-noise ratio (SNR) for various static phase error offsets and values of the damping parameter.

Numerical control servo drive signal generating system

Abstract: In a numerical control system the following error or distance to the end point is expressed as a binary number. This binary number is inspected and if above a certain value an offset number is added in order to obtain a desired transfer characteristic from digital to analog converter to which the digital number is to be applied. This new binary number is converted into an analog voltage which is used to drive the servo motor of a numerical control, point to point, or contouring, system. Depending upon the magnitude of the binary number to be converted, the digital to analog converter is switched between different resolutions to generate a smooth dynamic response and to provide high gain for small binary numbers.

Multi-projector image composing head

Abstract: The invention discloses a structure wherein a plurality of projectors are provided to project on a common focal plane images arranged in desired relative size and position to provide a composite image on a focal plane. From the composite image photographic plates may be derived. The various projectors are mounted to permit independent operation of the various projectors along parallel laterally offset lines and makes possible arrangements of separate material for use in preparing a composite picture in desired form.

Control system including a limiter having fixed offsets

Abstract: A control system having redundant channels and including limiting means whereby maximum and minimum limits for redundant control signals are a function of a desired offset.

Offset carrier recording system & method

Abstract: An offset carrier longitudinal scan recording and reproducing system for television signals wherein an amplitude modulated video signal is derived from a television receiver and converted to an offset carrier with a full upper sideband and an attenuated vestigial lower sideband. A direct or offset carrier audio signal may be recorded on the same channel with the offset carrier video signal. During monitoring and playback, the offset carrier is heterodyned to a television broadcast frequency or intermediate frequency and coupled into the television receiver. The same receiver may simultaneously supply video I.F. and audio F.M. signals for recording, and monitor offset carrier audio and video signals supplied to the recording head to facilitate recording adjustments.

Machine tool motor control with position offset

Abstract: A numerically controlled machine tool in which dimensional information is programmed with reference to a cutting tool centerline, or with reference to a cutting tool of standard dimension, provision being made for correcting such dimensional information by means of a position offset facility coupled to the numerical control so that dimensional information is modified in a sense to provide an indication of a desired position that accommodates a specific cutting tool dimension or other offset requirement, circulating register means being provided for circulating data with respect to a plurality of axes, and common arithmetic circuitry serving to process the data for the respective axes as the data circulates from the circulating register means through the common arithmetic circuitry.

Offset-voltage temperature-coefficient in dual m.o.s.f.e.t. source followers

Abstract: A technique is given for predicting the approximate temperature coefficient of offset voltage of a differential m.o.s.f.e.t. source-follower arrangement incorporated in a unity-gain buffer amplifier set up for zero offset at room temperature. The prediction is dependent on only one measurement, using a bridge-circuit technique, and takes account of possible power-law differences in the nominally matched dual m.o.s.f.e.t.s.

Device for forging crankshafts and the like

Abstract: A device for forging crankshafts having a plurality of throws disposed in different angular positions by carrying out the method consisting in upsetting one portion of a cylindrical initial blank either plain or formed with swellings, by exerting two oppositely directed efforts on the zone heated to the forging temperature, and by applying an effort perpendicular to the aforesaid oppositely directed efforts, in offsetting the intermediate portion of the initial bar. The offset portion constituting a crankpin, and the upset portions constituting two cheeks of the crankshaft to be forged.

An approximation to offset circle probabilities.

Abstract: If a weapon system is fired at a circular target and the impact point is distributed as a bivariate normal random variable, it is not particularly difficult to determine hit probability if the expected impact point is at target center. If, for some reason, the expected impact point is offset, the problem of determining hit probabilities becomes quite complex Herein is developed a method to approximate such a hit probability .