Information storage medium, information recording apparatus, and information reproduction apparatus

• US 20070065096A1
• Filed: 11/16/2006
• Published: 03/22/2007
• Est. Priority Date: 09/12/2001
• Status: Abandoned Application

• Current Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Original Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Inventors: Ando, Hideo, Noda, Chosaku
• Application Number:
  US11/600,129
• Publication Number:
  US 20070065096A1
• Time in Patent Office: Days
• US Class Current: 386/208
• CPC Class Codes: G11B 20/10009 Improvement or modification of read or write signals
• CPC Class Codes: G11B 20/10055 using partial response filtering when writing the signal to the medium or reading it therefrom
• CPC Class Codes: G11B 20/10296 using the Viterbi algorithm
• CPC Class Codes: G11B 20/1217 on discs
• CPC Class Codes: G11B 20/1426 conversion to or from block codes or representations thereof
• 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 2020/1457 wherein DC control is performed by calculating a digital sum value [DSV]
• 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 27/3027 used signal is digitally coded

Abstract

An information storage medium according to an embodiment of this invention has an area for storing predetermined data modulated according to the (d, k; m, n) modulation rule. The predetermined data includes at least one SYNC code in a predetermined recording unit, and the number of “1”s included in a predetermined number of a series of channel bits at an arbitrary position in the SYNC code is not more than a half the predetermined number.

Claims

1. An information storage medium comprising:

a data area being configured to store predetermined data in predetermined recording units,

wherein a part of the predetermined data is modulated according to a (d, k;

m, n) modulation rule,

the (d, k;

m, n) modulation rule modulates m-bit source data into n-channel bit data, so that modulated channel bit patterns satisfy conditions that a minimum d pieces of 0s successively arranged and a maximum of k pieces of 0s successively arranged,

the predetermined data includes a plurality of SYNC codes in the predetermined recording units,

a number of is included in a predetermined number of a series of channel bits at an arbitrary position in the SYNC code is not more than a half the predetermined number,

each of the plurality of SYNC codes includes a fixed code and a variable code,

wherein the fixed code includes k or more sequences of 0s successively arranged and d+1 sequences of 0s successively arranged,

wherein the variable code is one of a first pattern (SY0), a second pattern SY1), a third pattern (SY2), and a fourth pattern (SY3),

combinations of the variable codes of three successive SYNC codes in the predetermined recording units are different from one another, and the SYNC code is comprised of 24 channel bits, SYNC frame data subsequent to the SYNC code is comprised of 1092 channel bits, four types of SYNC codes including the first pattern, the second pattern, the third pattern, and the fourth pattern, respectively, are defined, each of the predetermined recording units is called one sector, and the third pattern is arranged in each of sixteenth and twenty-second positions from an initial position of said one sector.

2. A medium according to claim 1, wherein all patterns contained in the SYNC code satisfy a condition that a number of Is included in a series of N channel bits is not more than INT[N/(d+1)]

where INT[X] is an integer value obtained by dropping digits after the decimal point of X, and

N is given by N={(d+1).times.INT[9/(d+1)]}+1.

3. A medium according to claim 1, wherein nor less than 66% of patterns contained in the SYNC code satisfy a condition that a number of 1s included in a series of (N−

1) channel bits is not more than INT[(N−

1)/(d+1)]−

1

where INT[X] is an integer value obtained by dropping digits after the decimal point of X, and

N is given by N={(d+1).times.INT[9/(d+1)]}+1.

4. A medium according to claim 1, wherein the predetermined data stored in said information storage medium is modulated according to a (1, k;

m, n) modulation rule, and

all patterns contained in the SYNC code satisfy a condition that a number of Is included in a series of 9 channel bits is not more than 4.

5. A medium according to claim 1, wherein the predetermined data stored in said information storage medium is modulated according to a (1, k;

m, n) modulation rule, and

not less than 66% of patterns contained in the SYNC code satisfy a condition that a number of 1s included in a series of 8 channel bits is not more than 3.

6. An information storage medium comprising:

a data area being configured to store predetermined data in predetermined recording units,

wherein a part of the predetermined data is modulated according to a (d, k;

m, n) modulation rule,

the (d, k;

m, n) modulation rule modulates m-bit source data into n-channel bit data, so that modulated channel bit patterns satisfy conditions that a minimum d pieces of 0s successively arranged and a maximum of k pieces of 0s successively arranged, and

the predetermined data includes a plurality of SYNC codes in the predetermined recording units.