# US 7,613,983 B2 · Error correction device of optical disk unit

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- Number: US 7,613,983 B2
- Document ID: US7613983B2
- Status: Granted
- Kind: B2
- Application number: 11/473,180
- Filed: 2006-06-23
- Published: 2007-01-11
- Granted: 2009-11-03
- Earliest claimed: 2005-06-24
- Assignees: Kabushiki Kaisha Toshiba
- Inventors: Katsutoshi Moriyama; Yusuke Ikeda; Tomoyuki Maekawa
- Web page: https://patentgrep.com/patent/US7613983B2

## CPC

- G11B 20/1833: {by adding special lists or symbols to the coded information (G11B20/1806, G11B20/1866 take precedence)}
- G11B 20/1403: {characterised by the use of two levels}
- G11B 2020/1268: {Address in pregroove [ADIP] information}
- G11B 2020/1274: {stored in pre-pits, i.e. in embossed pits, ROM marks or prepits}
- G11B 2220/2562: DVDs [digital versatile discs]; Digital video discs; MMCDs; HDCDs
- G11B: INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER (recording measured values in a way that does not require playback through a transducer G01D9/00; recording or playback apparatus using mechanically marked tape, e.g. punched paper tape, or using unit records, e.g. punched or magnetically marked cards G06K; transferring data from one type of record carrier to another G06K1/18; circuits for coupling output of reproducer to radio receiver H04B1/20; gramophone pick-ups or like acoustic electromechanical transducers or circuits therefor H04R)

## Abstract

An error correction device for an optical disk reproduction unit for reproducing recorded information from an optical disk recorded with a code row data added with an error code in the same direction as a sequence of recorded information in the recording portion of the optical disk, and recorded guide information recorded in an inerasable state as a guide for recording the code row data before the code row data is recorded, wherein a prepit decoder as a first position detection portion is configured to detect a physical configurational singular point in the recorded guide information as a first position, a second position generating portion is configured to generate a second position replacing the first position detected by the prepit decoder with the code row data position, and an error correction circuit is configured to erase-correct error in the code row data using the second position.

## Claims

### Claim 1

An error correction device of an optical disk reproduction unit for reproducing recorded information from an optical disk recorded with a code row data added with an error code in the same direction as a sequence of recorded information in a recording portion of the optical disk and with recorded guide information recorded in advance in an inerasable state before the code row data is recorded as a recorded guide for recording said code row data in said optical disk, comprising:
a first position detection portion configured to detect a physical configurational singular point in said recorded guide information as a first position;
a second position generating portion configured to generate a second position replacing said first position detected by said first position detection portion with said code row data position; and
an error correction portion configured to erasure-correct said code row data error by using said second position.

### Claim 2 (depends on 1)

The error correction device of the optical disk unit according to claim 1, wherein said optical disk is a recordable digital versatile disk including DVD-R and DVD-RW, and said first position is a prepit recorded in advance as recorded guide information in said digital versatile disk.

### Claim 3 (depends on 1)

The error correction device of the optical disk unit according to claim 1, wherein said first position is said physical configurational singular point artificially formed for said recording portion of said optical disk, and a position of said physical configurational singular point is detected as said first position when said recorded information is reproduced from said optical disk, and said second position is generated by the relative positional relationship between said physical configurational singular point and said code row data.

### Claim 4 (depends on 3)

The error correction device of the optical disk unit according to claim 3, wherein said optical disk is a recordable digital versatile disk including DVD-R and DVD-RW, and said first position is a prepit recorded in advance as recorded guide information in said digital versatile disk.

### Claim 5 (depends on 1)

The error correction device of the optical disk unit according to claim 1, wherein the positional relationship between said physical configurational singular point artificially formed for said recording portion of said optical disk and said code row data obtained by reproducing said optical disk is detected, and based on this detection result, said second position is decided.

### Claim 6 (depends on 5)

The error correction device of the optical disk unit according to claim 5, wherein said optical disk is a recordable digital versatile disk including DVD-R and DVD-RW, and said first position is a prepit recorded in advance as recorded guide information in said digital versatile disk.

### Claim 7 (depends on 1)

The error correction device of the optical disk unit according to claim 1, wherein, when said first position is located between said code row data and a code row data in its vicinity, said second position comprises said second position information generating portion taken as a position including even the code row data in front and in rear replacing said first position with the position of said code row data.

### Claim 8 (depends on 7)

The error correction device of the optical disk unit according to claim 7, wherein said optical disk is a recordable digital versatile disk including DVD-R and DVD-RW, and said first position is a prepit recorded in advance as recorded guide information in said digital versatile disk.

### Claim 9

An error correction device of an optical disk reproduction unit for reproducing recorded information from an optical disk recorded with a first code row data added with an error code in the same direction as a sequence of recorded information in a recording portion of the optical disk and with recorded guide information recorded in advance in an inerasable state before said first code row is recorded as a recorded guide for recording said first code row data in said optical disk, comprising:
a first position detection portion configured to detect a physical configurational singular point in said recorded guide information as a first position;
a second position generating portion configured to generate a second position replacing said first position detected by said first position detection portion with said first code row data position;
an error detection portion configured to detect a data error of said second position; and
an error measurement portion configured to measure the number of errors detected by said error detection portion,
wherein, when the number of errors measured for a predetermined period by said error measurement portion satisfies a predetermined value, errors of said first code row data are erasure-corrected by using said second position.

### Claim 10 (depends on 9)

The error correction device according to claim 9, wherein said optical disk is DVD-R and DVD-RW disks, and based on whether or not said first detection portion detects a prepit, said second position is generated.

### Claim 11 (depends on 10)

The error correction device according to claim 10, wherein said first detection portion has means for recognizing a bit pattern of the prepit, and said second position generating portion takes a first predetermined position (J) and a second predetermined position (K) as second positions (where, J<K) in case the bit pattern of the prepit detected by said first detection portion is a prepit sync, and takes a second predetermined position (K) as a second position in case the bit pattern of said prepit is a prepit data 1.

### Claim 12 (depends on 10)

The error correction device according to claim 10, wherein said first detection portion has means for recognizing the bit pattern of the prepit and means for recognizing in which frame of an even number sync frame and an odd number sync frame of said first code row data, the prepit detected by said first detection portion exists,
wherein said second position generating portion takes a first predetermined position (J) and a second prepit position (K) as second positions in case the prepit detected by said first detection portion exists in the even number sync frame of said first code row data, and moreover, the bit pattern of the prepit detected by said first detection portion is a prepit sync,
wherein said second position generating portion takes a second predetermined position (K) as a second position in case the prepit detected by said first detection portion exists in the even number sync frame of said first code row data, and moreover, the bit pattern of the prepit detected by said first detection portion is a prepit data 1,
wherein said second position generating portion takes a third predetermined position (L) as a second position in case the prepit detected by said first detection portion exists in the odd number sync frame of said first code row data, and moreover, the bit pattern of the prepit detected by said first detection portion is a prepit sync, and
wherein said second position generating portion takes a fourth predetermined position (M) as a second position (where, J<K<L<M) in case the prepit detected by said first detection portion exists in the odd number sync frame of said first code row data, and moreover, the bit pattern of the prepit detected by said first detection portion is a prepit data 1.

### Claim 13 (depends on 9)

The error correction device according to claim 9, wherein the error detection portion for detecting the error of said second position data detects the error position from said first code row data.

### Claim 14 (depends on 13)

The error correction device according to claim 13, wherein said optical disk is DVD-R and DVD-RW disks, and said second position is generated based on the information as to whether or not said first detection portion detects the prepit.

### Claim 15 (depends on 14)

The error correction device according to claim 14, wherein said first detection portion has means for recognizing the bit pattern of the prepit, and
wherein said second position generating portion takes a first predetermined position (J) and a second predetermined position (K) as second positions (where, J<K) in case the bit pattern of the prepit detected by said first detection portion is a prepit sync, and takes a second predetermined position (K) as a second position in case the bit pattern of said prepit is a pit data 1.

### Claim 16 (depends on 14)

The error correction device according to claim 14, wherein said first detection portion has means for recognizing the bit pattern of the prepit and means for recognizing in which frame of the even number sync frame and the odd number sync frame of said first code row data, the prepit detected by said first detection portion exists,
wherein said second position generating portion takes a first predetermined position (J) and a second prepit position (K) as second positions in case the prepit detected by said first detection portion exists in the even number sync frame of said first code row data, and moreover, the bit pattern of the prepit detected by said first detection portion is a prepit sync,
wherein said second position generating portion takes a second predetermined position (K) as a second position in case the prepit detected by said first detection portion exists in the even number sync frame of said first code row data, and moreover, the bit pattern of the prepit detected by said first detection portion is a prepit data 1,
wherein said second position generating portion takes a third predetermined position (L) as a second position in case the prepit detected by said first detection portion exists in the odd number sync fame of said first code row data, and moreover, the bit pattern of the prepit detected by said first detection portion is a prepit sync, and
wherein said second position generating portion takes a fourth predetermined position (M) as a second position (where, J<K<L<M) in case the prepit detected by said first detection portion exists in the odd number sync frame of said first code row data, and moreover, the bit pattern of the prepit detected by said first detection portion is a prepit data 1.

### Claim 17 (depends on 9)

The error correction device according to claim 9, wherein the error detection portion for detecting the error of said second position detects the error position from the second code row data added with an error code in a direction different from said first code row.

### Claim 18 (depends on 17)

The error correction device according to claim 17, wherein said optical disk is DVD-R and DVD-RW disks, and based on whether or not said first detection portion detects a prepit, said second position is generated.

### Claim 19 (depends on 18)

The error correction device according to claim 18, wherein said first detection portion has means for recognizing the bit pattern of the prepit, and
wherein said second generating portion takes a first predetermined position (J) and a second predetermined position (K) as second positions (where, J<K) in case the bit pattern of the prepit detected by said first detection portion is a prepit sync, and takes a second predetermined position (K) as a second position in case the bit pattern of said prepit is a prepit data 1.

### Claim 20 (depends on 19)

The error correction device according to claim 19, wherein said first detection portion has means for recognizing in which frame of the even number sync frame and the odd number sync frame of said first code row data, the prepit detected by said first detection portion exists,
wherein said second position generating portion takes a first predetermined position (J) and a second prepit position (K) as second positions in case the prepit detected by said first detection portion exists in the even number sync frame of said first code row data, and moreover, the bit pattern of the prepit detected by said first detection portion is a prepit sync,
wherein said second position generating portion takes a second predetermined position (K) as a second position in case the prepit detected by said first detection portion exists in the even number sync frame of said first code row data, and moreover, the bit pattern of the prepit detected by said first detection portion is a prepit data 1,
wherein said second position generating portion takes a third predetermined position (L) as a second position in case the prepit detected by said first detection portion exists in the odd sync frame of said first code row data, and moreover, the bit pattern of the prepit detected by said first detection portion is a prepit sync, and
wherein said second position generating portion takes a fourth predetermined position (M) as a second position (where, J<K<L<M) in case the prepit detected by said first detection portion exists in the odd number sync frame of said first code row data, and moreover, the bit pattern of the prepit detected by said first detection portion is a prepit data 1.