Recording and/or replay device and method

Abstract

The purpose of the invention is to accurately and surely detect convex region presetting depression signal with in optical disc of convex region presetting depression set with address information while recording channel swing with a prescribed frequency independently of the time of recording or reproducing. Solution of the invention is: in a (A+B) signal and a (C+D) signal for detecting a radial push-pull signal, multiplying the (A+B) signal by a presetting coefficient k; or multiplying the presetting coefficient p, q by one or two of the (A+B) signal and the (C+D) signal. The presetting coefficient k or p, q is suitably made variable in accordance with an error rate when the convex region presetting depression is decoded, the lens shift amount of an objective lens of an optical pickup 2, and a level of convex region presetting depression signal and swing signal with respect to a signal level of sum signal. Thus, the convex region presetting depression signal on the optical disc could be accurately and surely detected independently of the time of recording or reproducing.

Description

field of invention [0001] The present invention relates to a DVD reproducing device and a DVD recording device suitable for recording and reproducing optical discs such as DVD-R and DVD-RW, or a recording and / or reproducing device and method suitable for a DVD recording and reproducing device. Background of the invention [0002] Generally, in a recordable optical recording medium, in order to be able to record desired information, address information etc. are pre-recorded in the form of pre-pits, and in order to generate a clock signal for recording and playback operations, set A recording track that wobbles at a predetermined frequency. [0003] As such an optical recording medium, for example, a DVD-R (Digital Versatile Disc-Recordable Recordable Digital Versatile Disc) capable of recording approximately seven times the information of a CD (Compact Disc) is known. In this DVD-R, together with the concave pregroove in the area where information such as video data and audi...

AI Technical Summary

Problems solved by technology

[0011] Therefore, in optical discs such as DVD-R and DVD-RW, the land pre-pit (LPP) is a binary value obtained by binarizing the radial push-pull signal (differential signal) by comparing it with a predetermined threshold value. However, in the prior art, adjustment is made so that the amplitude ratios of the two input signals used to calculate the radial push-pull signal (differential signal) become equal, however, in such a method, In the land

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