Data recording medium and data recording apparatus for recording identification signal on the data recording medium
AssigneeSony Corporation
InventorsYasuo Iwasaki, Nobuhiro Chiba, Kazumichi Hatate
Life of this patent
Estimating the term…
Abstract
A part of the reference signal used as the reference in recording and reproduction is recorded with the polarity thereof being inverted in a data recording medium or in a data recording apparatus in order to positively reproduce recorded data with a simple configuration. When identification signal NRZI for each sector is repeatedly recorded, for example, a part of this identification signal is recorded with the polarity thereof being inverted.
Claims9
A data recording medium in which an area for recording data is divided into sub-areas in preformatting;
- and in each divided sub-area, an identification-signal recording region for recording an identification signal identifying said divided sub-area is formed and said identification signal is recorded in said preformatting in said identification-signal recording region in a plurality of times of repeated recording, and a region other than said identification-signal recording region is formed in said divided sub-area such that said data is recorded or reproduced;
- said data recording medium having, in said identification-signal recording region, an inversion-recording zone wherein said identification signal is recorded with a polarity thereof being inverted in at least one of said plurality of times of repeated recording in order to reduce a sum of the DC levels of identification signals recorded in said plurality of times of repeated recording.
A data recording apparatus which divides an area for recording data in a data recording medium into sub-areas in preformatting;
- and in each divided sub-area, forms an identification-signal recording region for recording an identification signal identifying said divided sub-area and records said identification signal in said preformatting in said identification-signal recording region in a plurality of times of repeated recording, said data recording apparatus comprising:
- signal generation means for generating at least a signal indicating the start of said divided sub-area, said identification signal, and a signal forming a clock for reproducing said identification signal;
- signal arrangement means for arranging the outputs of said signal generation means in the order of recording said outputs into said data recording medium;
- signal modulation means for modulating the output of said signal arrangement means to a signal suited for recording to said data recording medium;
- polarity-inversion means for receiving the output of said signal modulation means and for selectively inverting the polarity of an identification signal to be recorded, in at least one of said plurality of times of repeated recording according to a control signal in order to reduce the sum of the DC levels of identification signals recorded in said plurality of times of repeated recording;
- recording means for recording the output of said polarity-inversion means into said data recording medium;
- and
- control means for controlling said signal generation means and said signal arrangement means, and for forming said control signal which controls said polarity-inversion means.
Dependencies are inferred from the claim text.