VALIDITY CHECK METHOD FOR A DIGITAL DISPLACEMENT DETECTOR AND A DETECTOR HAVING A VALIDITY CHECK SYSTEM

摘要

A checking process for data supplied by a digital detector with coded tracks. This detector is designed to supply two words of the same format: one word A in Gray code and one word D in Gray code complemented and shifted back by a half coding point. The apparatus includes the numerical deviation is checked between the two words supplied by detector correspondingly to the geometric shift provided by means of conversion levels in natural binary code complementation code as well as an adder and a coincidence gate supplying a validation signal.