Patent ID: 6778476
Filing Date: 2004-08-17
Classification: G11B

Abstract:
An information playback apparatus which plays back a land address and a groove address, from a recording medium on which a land and a groove are formed adjacently each other such that the land address is recorded on the land and the groove address is recorded at a position of the groove displaced from the land address in a direction along which the land and the groove extend, comprising:information readout means for reading out information recorded on the recording medium, by scanning the land or the groove; detection means for detecting the land address or the groove address included in the information read out by the information readout means to produce a detection signal and output the detection signal; masking means for masking, the detection signal produced while the information readout means passes the land adjacent to an area in which the groove address is recorded in case that the information readout means scans the land, and the detection signal produced while the information readout means passes the groove adjacent to an area in which the land address is recorded in case that the information readout means scans the groove, within the detection signal supplied from the detection means to produce a synchronism detection signal; and decoding means for decoding the information read out by the information readout means in response to the synchronism detection signal produced by the masking means to produce the land address or the groove address.