Class 708/809 - Coordinate conversion or vector resolver

Subclass of Class 708 - Electrical computers: arithmetic processing and calculating
Definition: Subject matter wherein the computer converts from one coordinate
No. of patents: 30
Last issue date: 02/12/2008

Number	Title	Issue Date
7330326	Recordable disk rotational speed error correction circuit An error correction circuit for determining an error in rotational speed of a recordable disk of a disk drive includes a sinusoidal error calculation portion adapted to generate a true oscillation error signal, and a summation portion adapted to combine the true osc...	02/12/2008
7123175	Angle detection apparatus computing phase differences between first and second phase angles A resolver use angle detection IC subjected to a phase lock operation so as to follow not an angle θ(t) for detection, but a phase angle ωot±θ(t) having an offset of a frequency ωot in the phase lock units. For this reason, when the excitation frequency ωot is...	10/17/2006
6943713	Process and device for the sequential addressing of the inputs of a multiplexer of a data acquisition circuit The systematic, and possibly repeated, acquisition of several distinct quantities for exploitation by a user system by utilizing a multiplexer with staged architecture without all inputs hard-wired. Each multiplexer stage is addressed by an elementary counter chaine...	09/13/2005
5986604	Survey coordinate transformation optimization A system for selecting an optimal transformation T(G2;G1) between a first ellipsoid E1 (e.g., WGS 84) in a first global coordinate system G1, relative to which the survey measurements are made, and a second ellipsoid E2 (e.g., NAD 27) in a second global c...	11/16/1999
5581485	Analog vector distance measuring and vector quantization architecture A distance measuring circuit includes an array of non-volatile analog storage cells arranged in rows and columns, input circuits to apply complementary analog voltages to pairs of row lines, and current measurement circuits connected to the column lines. ...	12/03/1996
5452238	Method for solving geometric constraint systems A method, useful in computer-aided design, for finding possible configurations of a system having a collection of geometric entities and constraints. The method represents the geometric entities in terms of degrees of freedom and systematically satisfies ...	09/19/1995
4920506	Ultra-high speed two-dimensional coordinate transform processor An ultra-high speed two-dimensional coordinate transform processor (10) contains layers having conducting lines representing coordinate lines in coordinate systems. Layers in a first set have conducting lines representing a first coordinate system. Layers...	04/24/1990
4481601	Method and circuitry for approximating the magnitude of a vector A magnitude signal representing the approximate magnitude of a control parameter vector for the control of multi-phase electrical apparatus is developed from the Cartesian coordinate signals of the vector. Signals representing one or both coordinates of a...	11/06/1984
4434437	Generating angular coordinate of raster scan of polar-coordinate addressed memory Graphics for television display which emphasize circles, ellipses, circular or elliptical arcs, and the radii of circles or ellipses are conveniently stored in image memories addressable in polar coordinates. Television images which are to be rotated are ...	02/28/1984
4410953	Angle comparison device Apparatus for providing an analogue output which is a trigonometrical function of the sum of an analogue angle input θ and a digital angle input $c; comprises multiplying means for multiplying sines and cosines of the two angles to produce signals rep...	10/18/1983
4405895	Angle digitizing method An angle digitizer receives signal representing the sine and cosine of the angle to be digitized. The voltages are fed to orthogonal pairs of input terminals. Between each two input terminals is a set of equivalued resistors to form a resistor ring. At th...	09/20/1983
4360889	Rotary position indicating circuit A circuit for indicating angular position of a rotary member comprising a resolver including an amplitude stabilized sine-cosine generator coupled to quadrature windings of the resolver for providing a d.c. signal which varies as a linear function of the ...	11/23/1982
4340939	Solid-state resolver apparatus including digital angle modifier A resolver apparatus for receiving simultaneously a vectorial input signal and an angular input signal. The apparatus comprises a first resolver, a second resolver and a digital angle modifier consisting of a memory and an adder. The angular input signal ...	07/20/1982
4335443	Electronic angle resolver The circuit of the angle resolver compares a first angle to a second angle and produces an output voltage which is an analog representation of the angular difference between the two. One of the angles, which might be a controlled variable is represented b...	06/15/1982
4335444	Multiple pulse-width multiplier For forming ##EQU1## in a pulse width multiplier, two input voltages bi are summed at the input of an inverter and are added, after each passes through a separate switch and proportional stage, at the input of a smoothing stage, to the ...	06/15/1982
4306296	Converter for changing Cartesian vector variables into polar vector variables A coordinate converter useful for field-oriented control of a rotating-field machine includes a divider, a first adder, a multiplier and a second adder by which the magnitude of the vector and the tangent of the half-angle relative to one axis can be dete...	12/15/1981
4293923	System for simulating the operating characteristics of electric machines The invention concerns the analog simulation of the parameters and the operating characteristics of three-phase rotating machines. The system comprises a unit for transforming the three-phase armature currents of a machine into equivalent diphase currents...	10/06/1981
4285048	Space variant signal processor A correlation method and apparatus for electrical signal transmission and ception of coded waveforms are disclosed which makes use of a coordinate transformation of the original waveform prior to transmission, effecting an inverse coordinate transformatio...	08/18/1981
4250559	Coordinate converter for changing polar vector variable into Cartesian vector variables A coordinate converter distinguished by low cost of hardware and useful for the field-oriented control of a rotating-field machine contains two multipliers, an adder and a subtraction element in a logic circuit. Optionally, two proportional elements can b...	02/10/1981
4190895	Method and apparatus for rotating cartesian coordinate signals A method and apparatus for rotating cartesian coordinate signals x, y about an angle θ°. The apparatus converts the x, y signals into polar coordinate signals ς, $c; and then changes the angle $c; by θ°.Theapparatus then converts the resulting ...	02/26/1980
4104730	Boresight adjustment for a harmonic oscillator coordinate converter A harmonic oscillator coordinate converter in combination with analog and digital circuits is described which may accept signals indicative of a measured angle and of a misalignment angle to provide coordinate conversions of a vector through the measured ...	08/01/1978
4095145	Display of variable length vectors A variable length vector display system allows visual indication of the sd and direction of aircraft or moving vehicles, maintaining a constant illumination on the face of a cathode ray tube independent of the vector length or vector movement. The vector...	06/13/1978
4051350	Position measuring device The invention concerns a position measuring device used for measuring the position of a vessel equipped with three hydrophones arranged at the apexes of a triangle in relation to a transmitting beacon on the sea bed. Measuring of the differences in the tr...	09/27/1977
4047014	Coordinate converter An electronically controlled coordinate converter for transforming vectors from a first coordinate system to a second coordinate system through an input angle is provided using a harmonic oscillator which is responsive to an oscillation angle control sign...	09/06/1977
4026031	Surface measurement instruments A method of determining the coordinates of the center of curvature of the curved surface of a workpiece on a surface measurement instrument of the type having a workpiece table rotatably mounted on a main spindle, and a sensor for contacting the surface o...	05/31/1977
4017726	Four quadrant rate taker and synchronizer An apparatus for extracting signals, proportional to data relative to a given variable, from two data modulated signals which mutually define the variable. Each signal is followed-up with a linear integrate/clamp circuit, the outputs of which are cross mu...	04/12/1977
4002827	Polar coordinate format to a cartesian coordinate format scan converter A slow scan radar signal is converted from a polar coordinate format to a cartesian coordinate format to permit the radar signal to be displayed on a television type display device. The radar signal, in analog form, is converted to a digital signal, place...	01/11/1977
3974367	Solid-state resolver apparatus A solid-state resolver apparatus comprising cascaded coarse and fine-angle resolvers. The fine-angle resolver includes first and second averaging means for averaging input and output signals, first and second multipliers for multiplying a digital angular ...	08/10/1976
3973190	Infralow frequency transfer function analyzer An infralow frequency controlled-member transfer function analyzer comprises an electromechanical infralow frequency generator, a rotary transformer mechanically coupled to the output shaft of the electromechanical infralow frequency generator, a matching...	08/03/1976
3963912	Signal resolving apparatus A multiplier circuit arrangement comprises two parallel paths for the same signal, one of the paths being associated with signal level adjusting means; and means responsive to imbalance of d.c. components including any in said parallel paths, th imbalance...	06/15/1976

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Class 708/809 - Coordinate conversion or vector resolver