Erasing of information signal from an optical disk

Details Erasing of information signal from an optical disk Erasing of information signal from an optical disk

G - Physics

11

B

352/32.1

G11B 7/00 (2006.01) G11B 19/04 (2006.01) H04N 5/76 (2006.01) H04N 5/85 (2006.01)

Patent

CA 1308482

ABSTRACT OF THE DISCLOSURE 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 informations 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.

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