Title:
INFORMATION RECORDING MEDIUM AND INFORMATION RECORDING AND REPRODUCING DEVICE USING IT
Document Type and Number:
Japanese Patent JP2002197801
Kind Code:
A
Abstract:
To provide a recording and reproducing device adopting a recording coding system including a DC component that facilitates setting of a threshold value for data reproduction (binarization).
A VFO(variable frequency oscillator) pattern where a ratio of periods for mark and space parts differs from each other is recorded on a VFO area used for phase locking of a clock. In the case of reproducing the VFO area, a phase of a PLL(phase lock loon) is locked and an average of reproduction signals for this period is obtained. When the VFO period is finished, the average is stored. The value is used for a threshold value for binarization of the reproduction signals.
Inventors:
YAMAKAWA HIDEYUKI
KATAYAMA YUKARI
KATO TAKATOSHI
MAEDA TAKESHI
MIYAMOTO JIICHI
NAKAMURA ATSUSHI
KATAYAMA YUKARI
KATO TAKATOSHI
MAEDA TAKESHI
MIYAMOTO JIICHI
NAKAMURA ATSUSHI
Application Number:
JP2000391284A
Publication Date:
July 12, 2002
Filing Date:
December 22, 2000
Export Citation:
Assignee:
HITACHI LTD
MATSUSHITA ELECTRIC IND CO LTD
MATSUSHITA ELECTRIC IND CO LTD
International Classes:
G11B20/12; G11B7/005; G11B7/007; G11B20/14; (IPC1-7): G11B20/12; G11B7/005; G11B7/007; G11B20/14
Attorney, Agent or Firm:
Kenjiro Take