Absolute-type pseudorandom shaft encoder with any desired resolution

Abstract

It is shown how to use a 2n−1 length pseudorandom binary sequence to develop an absolute-type shaft encoder having any t resolution, where 2n−1−1<t<2n−1. The shaft encoder rotating device has only two concentric code-track and 2n−1 reading heads. A sequential code-conversion method is used to translate the pseudorandom patterns into natural binary code.