The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 06, 1977
Filed:
Apr. 02, 1976
Steven Morrison, Baltimore, MD (US);
George A Williams, Ellicott City, MD (US);
Westinghouse Electric Corporation, Pittsburgh, PA (US);
Abstract
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 signal having a discontinuity or transition point wherein an incremental change in the input angle at a predetermined value causes a step function in the duration of said oscillation angle control signal. The discontinuity in the oscillation angle control signal is eliminated by control circuits within a selected range of input angles where the error effects due to transformations on either side of the discontinuity are avoided. Another feature of the invention is that the discontinuity in the oscillation angle control signal may be shifted away from or in response to a previous vector transformation having an input angle close to the discontinuity to avoid recurrent vector transformations on either side of the oscillation angle control signal discontinuity due to slight incremental fluctuations in the input angle.