Optical disk device

Abstract

A write type optical disk device with the PRML mode allows accuracy in the trial writing to be improved accompanied with the high speed processing while assuring the readout compatibility. A readout signal that has been A / D converted at timing that interposes the edge has its phase compensated with the even numbered FIR filter. The level at the edge point and the absolute values thereof are accumulated respectively so as to provide a circuit for detecting the edge shift and jitter. Coping with the high speed processing, the edge shift of the readout signal is detected at the position where the edge shift is around zero, thus improving the accuracy in learning of trial writing.

Description

technical field [0001] The present invention relates to an optical disc recording device which forms recording marks having different physical properties from other parts on a recording medium and records information. Background technique [0002] Optical disk media such as DVD-RAM and DVD-RW using rewritable phase-change optical recording materials are widely used. Recently, a Blu-ray Disc with a larger capacity corresponding to high-definition broadcast video using a blue laser has also been commercialized. In the future, it is desired to realize an optical disc device capable of recording / reproducing DVD and Blu-ray Disc with a single drive. When recording information on these high-density optical discs, rationalization of the power and pulse conditions of recording laser light generally called "trial writing" is important. [0003] In the evaluation of the quality of a signal recorded on an optical disk, jitter in which the deviation between a data edge and a clock edg...

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Problems solved by technology

On the other hand, its disadvantage is that since the target signal is generated as the coincidence of the impulse responses, the asymmetry of the target signal is zero except in special cases when the asymmetry of the signal recorded on the optical disc is not zero , the error between the target signal and the reproduced signal becomes larger

In JP-A-2003-6864, there is no mention of common FIR filter tap coefficients and frequency characteristics in the trial writing process.

In addition to this point, in the trial writing of the method of selecting the recording condition to meet the target signal of PRML, there is the following problem: the jitter may not be well maintained in the device other than the above-mentioned device, that is, insufficient consideration is given. regeneration swap

[0021] Issue 2: Consider not degrading the system performance of the regenerative system at the same time

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