INFORMATION RECORDING DEVICE AND METHOD, INFORMATION REPRODUCING DEVICE AND METHOD, RECORDING MEDIUM, PROGRAM, AND DISC RECORDING MEDIUM

• US 20080046794A1
• Filed: 04/18/2007
• Published: 02/21/2008
• Est. Priority Date: 01/25/2002
• Status: Active Grant

• Current Assignee: Koninklijke Philips Electronics N.V. (Koninklijke Philips N.V.), Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation), Sony Corporation (Sony Group Corp.)
• Original Assignee: Koninklijke Philips Electronics N.V. (Koninklijke Philips N.V.), Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation), Sony Corporation (Sony Group Corp.)
• Inventors: Nijboer, Jakob, Schep, Cornelis, Stek, Aalbert, Ishihara, Hideshi, Usui, Makoto, Kobayashi, Shoei, Yamagami, Tamotsu, Senshu, Susumu, Moriya, Mitsurou
• Granted Patent: US 7,975,206 B2
• Time in Patent Office: Days
• US Class Current: 714/752
• CPC Class Codes: G11B 20/00086 Circuits for prevention of unauthorised reproduction or copying, e.g. piracy indicating unauthorised use of record carriers in general G11B23/28; scrambling for television signal recording H04N5/913; network architectures or network protocols for network security H04L63/00; cryptographic mechanisms or cryptographic arrangements for secret or secure communication H04L9/00
• CPC Class Codes: G11B 20/00268 said barcode being recorded in a burst cutting area [BCA]
• CPC Class Codes: G11B 20/1252 for discontinuous data, e.g. digital information signals, computer programme data
• CPC Class Codes: G11B 20/18 Error detection or correction; Testing , e.g. of drop-outs
• 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 2020/122 Burst cutting area [BCA]
• CPC Class Codes: G11B 2020/1222 ECC block, i.e. a block of error correction encoded symbols which includes all parity data needed for decoding pure error correction aspects G11B20/18
• CPC Class Codes: G11B 2020/1287 Synchronisation pattern, e.g. VCO fields specific bit sequences of sync patterns G11B20/1403; A/V synchronisation G11B27/00
• CPC Class Codes: G11B 2220/2537 Optical discs
• CPC Class Codes: G11B 2220/2562 DVDs [digital versatile discs]; Digital video discs; MMCDs; HDCDs
• CPC Class Codes: G11B 7/00736 Auxiliary data, e.g. lead-in, lead-out, Power Calibration Area [PCA], Burst Cutting Area [BCA], control information sector headers or adresses in prepits G11B7/00745; address data in track wobble G11B7/24082

Abstract

An ECC block is constituted by RS(248,216,33). Of a data length of 216 bytes (symbols), only 16 bytes are allocated to BCA data and the remaining 200 bytes are used for fixed data having a predetermined value. Using the fixed data of 200 bytes and the BCA data of 16 bytes, parities of 32 bytes (symbols) are calculated. Only the BCA data of 16 bytes and the parities of the former 16 bytes of the 32-byte parities, that is, a total of 32 bytes only, are recorded in a burst cutting area of an optical disc. In decoding, error correction processing is carried out by using the fixed data of 200 bytes. The unrecorded parities of 16 bytes are processed as having been erased. Thus, the error correction capability in a burst cutting area of an optical disc can be improved.

Claims

1. An information recording device for recording main data onto a disc recording medium having a data area for recording the main data and a burst cutting area for recording auxiliary information, the device comprising:

first acquisition means for acquiring the auxiliary information recorded in the burst cutting area, the auxiliary information being blocked to generate error correction blocks, using an error correcting code that is the same as an error correction code RS (m,n,k) of the main data recorded in the data area, with data having a length d which is smaller than the n and fixed data having the remaining length n-d;

second acquisition means for acquiring the main data;

encryption means for encrypting the main data acquired by the second acquisition means on the basis of the auxiliary information acquired by the first acquisition means;

modulation means for modulating the main data encrypted by the encryption means; and

recording means for recording the main data modulated by the modulation means into the data area on the data recording medium.

2. The information recording device as claimed in claim 1, wherein only a part of parities having a length of k-1 of the error correction blocks is encoded.

3. The information recording device as claimed in claim 2, wherein only parities of (k-1)/2, which are a part of parities having a length of k-1, of the error correction blocks are encoded.

4. The information recording device as claimed in claim 1, wherein the error correcting code RS(m,n,k) is RS(248,216,33).

5. An information recording method for an information recording device which records main data onto a disc recording medium having a data area for recording the main data and a burst cutting area for recording auxiliary information, the device comprising:

a first acquisition step of acquiring the auxiliary information recorded in the burst cutting area, the auxiliary information being blocked to generate error correction blocks, using an error correcting code that is the same as an error correction code RS (m,n,k) of the main data recorded in the data area, with data having a length d which is smaller than the n and fixed data having the remaining length n-d;

a second acquisition step of acquiring the main data;

an encryption step of encrypting the main data acquired by the processing of the second acquisition step on the basis of the auxiliary information acquired by the processing of the first acquisition step;

a modulation step of modulating the main data encrypted by the processing of the encryption step; and

a recording step of recording the main data modulated by the processing of the modulation step into the data area on the data recording medium.

6. A recording medium having a computer-readable program recorded thereon, the program being adapted for an information recording device which record main data onto a disc recording medium having a data area for recording the main data and a burst cutting area for recording auxiliary information, the program comprising:

a first acquisition step of acquiring the auxiliary information recorded in the burst cutting area, the auxiliary information being blocked to generate error correction blocks, using an error correcting code that is the same as an error correction code RS (m,n,k) of the main data recorded in the data area, with data having a length d which is smaller than the n and fixed data having the remaining length n-d;

a second acquisition step of acquiring the main data;

an encryption step of encrypting the main data acquired by the processing of the second acquisition step on the basis of the auxiliary information acquired by the processing of the first acquisition step;

a modulation step of modulating the main data encrypted by the processing of the encryption step; and

a recording step of recording the main data modulated by the processing of the modulation step into the data area on the data recording medium.

7. A program executable by a computer which controls an information recording device for recording main data onto a disc recording medium having a data area for recording the main data and a burst cutting area for recording auxiliary information, the program comprising:

a first acquisition step of acquiring the auxiliary information recorded in the burst cutting area, the auxiliary information being blocked to generate error correction blocks, using an error correcting code that is the same as an error correction code RS (m,n,k) of the main data recorded in the data area, with data having a length d which is smaller than the n and fixed data having the remaining length n-d;

a second acquisition step of acquiring the main data;

an encryption step of encrypting the main data acquired by the processing of the second acquisition step on the basis of the auxiliary information acquired by the processing of the first acquisition step;

a modulation step of modulating the main data encrypted by the processing of the encryption step; and

a recording step of recording the main data modulated by the processing of the modulation step into the data area on the data recording medium.