Importance

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Abstract

An apparatus and method are disclosed for indicating the angular position of an object relative to a reference position in which a plurality of different tracks of indicia are positioned on indicia-supporting media that is adapted for movement with the object. High resolution position words are assembled by merging position information resolved from a plurality of different tracks of indica. The position information is resolved by way of sine wave synthesis in which position information from a pair of tracks having different resolutions is used to generate position information of an intermediate resolution. This intermediate position information is merged with position information from the higher resolution track of the two tracks. The position information from each of the different tracks is merged by comparing several of the most significant bits of the position information from several of the selected tracks with a corresponding number of least significant bits of the position information from others of the selected tracks. Position information of the selected tracks is then corrected as a function of the comparison, and the synchronized position information is combined to form position words indicative of the position of the object relative to the reference position. These position words have a resolution greater than that available by reading the plurality of different tracks of indicia directly.

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First Claim