Erasing of information signal from an optical disk

摘要

A control circuit for controlling the erasing of an information signal recorded on an optical disk such that the information signal is erased except for the vertical blanking interval and for the interval corresponding to the address signal of the information on the disk. The rest of the information signal including the horizontal synchronizing signal is erased either continuously or intermittently or is not erased. The circuit produces a control signal which assumes a first logical state for enabling the erasing and a second logical state for disabling the erasing responsive to a horizontal synchronizing signal, a vertical synchronizing signal and a command signal commanding the erasing of a particular information signal on the disk.