Patent ID: 7245568
Filing Date: 2007-07-17
Classification: G11B

Abstract:
1. A disc recording and reproducing device, comprising: a resuming section which resumes, after writing of record data on a disc is interrupted, writing of the record data, which is continuous to the record data of which writing is interrupted, at an additional data region just after an end of a recorded data region that is a region of the record data already recorded on the disc; a first reproduction synchronization signal output section which reproduces the record data recorded on the recorded data region, sequentially extracts a synchronization signal from the reproduced record data, and outputs a first reproduction synchronization signal with a frame having a predetermined length that is sequentially structured by the sequentially extracted synchronization signal; a reliability judging section which only detects a frame having a period that is in accordance with a predetermined standard from the first reproduction synchronization signal, and outputs the frame as a reliability synchronization signal; a synchronization signal phase retaining section which outputs, based on the frame contained in the reliability synchronization signal, a retained phase signal that retains a phase of the frame of the reliability synchronization signal; a second reproduction synchronization signal output section which reproduces the record data recorded on the additional data region, sequentially extracts the synchronization signal from the reproduced record data, and outputs a second reproduction synchronization signal with a frame having a predetermined length that is sequentially structured by the sequentially extracted synchronization signal; and a phase difference measuring section which measures a displacement of frames between the second reproduction synchronization signal and the retained phase signal, as a phase difference.