OPTICAL DISC APPARATUS AND OPTICAL DISC PROVIDED WITH QUALITY ESTIMETOR FOR GENERATING QUALITY VALUE OF RECORDING QUALITY OF OPTICAL DISC

• US 20170262338A1
• Filed: 11/18/2016
• Published: 09/14/2017
• 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
• Granted Patent: US 10,521,297 B2
• Time in Patent Office: 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 predetermined block, the optical disc apparatus comprising:

an information divider that 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 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 control data that includes a value indicating the amount of the data included in each of the blocks;

and 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.

3. An optical disc apparatus that records and reproduces data onto and from an optical disc, the optical disc including a first space into which user data is recorded, and a second space into which management information different from the user data is recorded in units of a predetermined block, the optical disc apparatus comprising:

an error-correction encoder circuit that error-correction-encodes the user data in units of a first block in the first space, and error-correction-encodes the management information in units of a second block, the second block having a length shorter than a length of the unit of the first block, and having a redundancy degree higher than a redundancy degree of the unit of the first block; and

a recorder that converts the error-correction-encoded user data or management information into a recording signal, and records the recording signal into the optical disc.

4. An optical disc which user data and management information are recorded into and reproduced from, the optical disc comprising:

a first space, which the user data error-correction-encoded in units of a first block is recorded into and reproduced from; and

a second space, which the management information is recorded into, the management information being error-correction-encoded in units of a second block, the second block having a length shorter than a length of the unit of the first block, and having a redundancy degree higher than a redundancy degree of the unit of the first block.