Apparatus for reproducing designated information from a recorded disc

Abstract From the Canadian patent

An apparatus for reproducing designated information from a digitally recorded disc uses a stepping motor which moves an optical pick-up device radially across the disc to the designated location using a predetermined number of stepping pulses representing the distance of the optical head to the designated location. A motor control circuit generates the stepping pulses in response to a driving signal comprising a predetermined number of driving pulses and a direction signal, the polarity of which corresponds to radially inward or outward movement of the pick-up device relative to the disc. A counter counts the driving pulses so that the actual count in the counter represents the distance of …