Optical disc apparatus for recording and reproducing data onto and from an optical disc based on an evaluation value

• US 10,223,202 B2
• Filed: 01/08/2018
• Issued: 03/05/2019
• Est. Priority Date: 03/10/2016
• Status: Active Grant

• Current Assignee: Panasonic Intellectual Property Management Co., Ltd. (Panasonic Holdings Corporation)
• Original Assignee: Panasonic Intellectual Property Management Co., Ltd. (Panasonic Holdings Corporation)
• Inventors: Nakata, Kohei, Takagi, Yuji
• Primary Examiner(s): Dorman, Christian M
• Application Number:
  US15/864,161
• Publication Number:
  US 20180129566A1
• Time in Patent Office: 421 Days
• CPC Class Codes: G06F 11/1076 Parity data used in redundant arrays of independent storages, e.g. in RAID systems
• CPC Class Codes: G06F 3/0619 in relation to data integrity, e.g. data losses, bit errors
• CPC Class Codes: G06F 3/064 Management of blocks
• CPC Class Codes: G06F 3/0677 Optical disk device, e.g. CD-ROM, DVD
• CPC Class Codes: G11B 20/10305 signal quality assessment
• CPC Class Codes: G11B 20/10361 digital demodulation process
• CPC Class Codes: G11B 20/1217 on discs
• CPC Class Codes: G11B 20/1833 by adding special lists or symbols to the coded information G11B20/1806, G11B20/1866 take precedence
• CPC Class Codes: G11B 2020/1853 using a product code which has inner and outer parity symbols
• CPC Class Codes: G11B 7/005 Reproducing G11B7/0065 takes precedence
• CPC Class Codes: H03M 13/1515 Reed-Solomon codes
• CPC Class Codes: H03M 13/19 Single error correction without using particular properties of the cyclic codes, e.g. Hamming codes, extended or generalised Hamming codes
• CPC Class Codes: H03M 13/2909 Product codes
• CPC Class Codes: H03M 13/2948 Iterative decoding H03M13/2957 takes precedence
• CPC Class Codes: H03M 13/35 Unequal or adaptive error protection, e.g. by providing a different level of protection according to significance of source information or by adapting the coding according to the change of transmission channel characteristics
• CPC Class Codes: H03M 13/618 Shortening and extension of codes

Abstract

In an optical disc apparatus that records and reproduces data onto and from an optical disc in units of predetermined block, an information divider divides the data so as to reduce an amount of the data included in each of blocks when a recording state of the optical disc does not satisfy a predetermined criterion, and reproduces recording data in units of the block by adding sub-information including a value indicating the amount of the data included in each of the blocks. An error-correction encoder circuit encodes the recording data in a first error-correction code format, and a recorder converts encoded recording data into a recording signal, and records the recording signal onto the optical disc. A quality evaluator circuit produces an evaluation value indicating a recording quality based on a result of reproducing the recording signal recorded on the optical disc.

Claims

1. An optical disc apparatus that records and reproduces data onto and from an optical disc in units of a predetermined block size, the optical disc apparatus comprising:

an information divider that divides the data so as to reduce an amount of valid data included in each of blocks having the predetermined block size when a recording state of the optical disc does not satisfy a predetermined criterion, and generates recording data in units of the predetermined block size by adding invalid data and sub-information including a value indicating the amount of the valid data included in each of the blocks having the predetermined block size such that each of the blocks having the predetermined block size includes the valid data, the invalid data, and the sub-information;

an error-correction encoder circuit that encodes the recording data in a first error-correction code format;

a recorder that converts encoded recording data into a recording signal, and records the recording signal onto the optical disc; and

a quality evaluator circuit that produces an evaluation value indicating a recording quality based on a result of reproducing the recording signal recorded on the optical disc.

2. The optical disc apparatus according to claim 1,

wherein the sub-information includes (i) control data that includes the value indicating the amount of the valid data included in each of the blocks having the predetermined block size, and (ii) an error-correction parity code for the control data used when error-correcting the control data with a second error-correction code format, and

wherein a redundancy degree of the second error-correction code format is higher than a redundancy degree of the first error-correction code format.