ANGULAR POSITION AND ROTATIONAL VELOCITY DETECTION USING "PERFECT WORD"

A precision temporal pulse 10 indicating accurate rotational velocity and precise angular position of a object rotating about an axis is generated. A "perfect word" 12 binary code sequence is applied to a binary code track 16 of an encoding disk 13. Binary code bits are synchronously detected as they pass through a code reader 22, that synchronously generates a bit by bit replica of the sequence of bits detected by the reader 22. The bits are stored in a shift register 28, and are synchronously compared to a stored reference value by logic circuitry. A temporal pulse is generated when the logic circuitry has identified that the stored value is equal to the reference value.