Record carrier, playback device and method of recording information

• US RE44,659 E1
• Filed: 05/30/2008
• Issued: 12/24/2013
• Est. Priority Date: 01/27/1999
• Status: Expired due to Term

• Current Assignee: Koninklijke Philips N.V.
• Original Assignee: Koninklijke Philips N.V.
• Inventors: Spruit, Johannes H. M., Van Den Enden, Gijsbert Joseph, Linnartz, Johan P. M. G., Talatra, Johan C.
• Primary Examiner(s): TRAN, THANG V
• Application Number:
  US12/129,756
• Time in Patent Office: 2,034 Days
• Field of Search: 369/275.4, 369/275.2, 369/44.13, 369/47.27, 369/47.28, 369/47.19, 369/47.22, 369/47.43, 369/47.48, 369/53.31, 369/53.35, 369/124.02, 369/124.04, 369/124.07, 369/44.26, 369/111, 369/59.12, 369/59.23
• US Class Current: 369/47.19
• 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 20/00405 the key being stored by varying characteristics of the recording track, e.g. by altering the track pitch or by modulating the wobble track
• CPC Class Codes: G11B 20/00586 said format change concerning the physical format of the recording medium
• CPC Class Codes: G11B 20/1419 to or from biphase level coding, i.e. to or from codes where a one is coded as a transition from a high to a low level during the middle of a bit cell and a zero is encoded as a transition from a low to a high level during the middle of a bit cell or vice versa, e.g. split phase code, Manchester code conversion to or from biphase space or mark coding, i.e. to or from codes where there is a transition at the beginning of every bit cell and a one has no second transition and a zero has a second transition one half of a bit period later or vice versa, e.g. double frequency code, FM code
• 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 2220/218 Write-once discs
• CPC Class Codes: G11B 2220/2545 CDs
• CPC Class Codes: G11B 2220/2562 DVDs [digital versatile discs]; Digital video discs; MMCDs; HDCDs
• CPC Class Codes: G11B 27/24 by sensing features on the record carrier other than the transducing track ; sensing signals or marks recorded by another method than the main recording
• CPC Class Codes: G11B 27/3027 used signal is digitally coded
• CPC Class Codes: G11B 7/004 Recording, reproducing or erasing methods; Read, write or erase circuits therefor magneto-optical systems G11B11/105
• CPC Class Codes: G11B 7/007 Arrangement of the information on the record carrier, e.g. form of tracks , actual track shape, e.g. wobbled, or cross-section, e.g. v-shaped; Sequential information structures, e.g. sectoring or header formats within a track
• 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
• CPC Class Codes: G11B 7/24082 Meandering

Abstract

A record carrier has substantially parallel tracks having first variations of a first physical parameter and second variations of a second physical parameter of the track. The first variations represent information recorded on the record carrier, this information being recoverable by a controllable type of data processing. A modulation pattern of the second variations represents a code for controlling the type of data processing. In respect of a code track that includes the modulation pattern, the modulation pattern in the left neighboring track is aligned to the modulation pattern in the right neighboring track. Thereby crosstalk due to the second variations is decreased, and at least two tracks have the same modulation pattern. The playback device has a demodulator (50) and a control unit (56) for retrieving the code from at least two tracks.

Claims

1. A record carrier comprising substantially parallel tracks having:

first variations of a first physical parameter of the track tracks, the first variations representing information recorded on the record carrier, said information being recoverable by a controllable type of data processing; and

second variations of a second physical parameter of the track tracks, a modulation pattern of the second variations representing a code for controlling said type of data processing,

characterized in that, with respect to a code track

a series of laterally adjacent tracks, each comprising said modulation pattern, the series of tracks including;

a code track, a left neighboring track on the left of and laterally adjacent to the code track, and a right neighboring track on the right of and laterally adjacent to the code track, athe modulation pattern in athe left neighboring track is laterally aligned to awith the modulation pattern in athe right neighboring track, the laterally aligned modulation patterns continuing the lateral alignment and said modulation pattern unchanged substantially over the entire circumferential length of the code track.

6. The record carrier as claimed in claim 1, wherein the tracks constitute a spiral or concentric pattern of tracks, and adjacent tracks in the pattern of tracks exhibit a same number of the second variations.

7. The record carrier as claimed in claim 1, wherein only tracks in a limited area of multiple tracks of the record carrier exhibit said second variations, and a further area of multiple tracks of the record carrier, outside the limited area, do not exhibit said second variations, the limited area and further area of multiple tracks of the record carrier each comprise a different respective consecutive series of multiple laterally adjacent tracks.

8. The record carrier as claimed in claim 7 A record carrier comprising substantially parallel tracks having:

first variations of a first physical parameter of the tracks, the first variations representing information recorded on the record carrier, said information being recoverable by a controllable type of data processing; and

second variations of a second physical parameter of the tracks, a modulation pattern of the second variations representing a code for controlling said type of data processing,

wherein only tracks in a limited area of multiple tracks of the record carrier exhibit said second variations, wherein areas of multiple tracks of the record carrier are each defined by a respective consecutive series of multiple laterally adjacent tracks,

wherein the limited area of multiple tracks comprises a boundary zone area of multiple tracks between an area of multiple tracks not exhibiting second variations and a center area of multiple tracks exhibiting the second variations at a predetermined amplitude, the amplitude of the second variations in the boundary area of multiple tracks increasing from zero to the predetermined amplitude.

2. A record carrier comprising substantially parallel tracks having:

first variations of a first physical parameter of the track tracks, the first variations representing information recorded on the record carrier, said information being recoverable by a controllable type of data processing; and

second variations of a second physical parameter of the track tracks, a modulation pattern of the second variations representing a code for controlling said type of data processing,

characterized in that, with respect to a code tracka series of laterally adjacent tracks, each comprising said modulation pattern, the series of tracks including;

a code track, a left neighboring track on the left of and laterally adjacent to the code track, and a right neighboring track on the right of and laterally adjacent to the code track, athe modulation pattern in athe left neighboring track is laterally aligned to awith the modulation pattern in athe right neighboring track, the laterally aligned modulation patterns continuing the lateral alignment and said modulation patterns unchanged substantially over the entire circumferential length of the code track,

wherein the second variations are displacements of the track in a direction transverse to a longitudinal direction of the track, and displacements of the left neighboring track coincide with displacements of the right neighboring track in the a same direction.

3. The record carrier as claimed in claim 2, wherein the modulation patterns in the code track and the neighboring tracks represent the same code.

4. The record carrier as claimed in claim 3, wherein the modulation pattern in the code track is substantially inverse to the modulation pattern in the left neighboring track.

5. The record carrier as claimed in claim 3, wherein the second variations are periodic, and the modulation pattern comprises phase modulation, and phase differences between modulation patterns in adjacent tracks are limited to a predetermined amount.

9. A playback device for recovering information from a record carrier comprising substantially parallel tracks having first variations of a first physical parameter of the track tracks, the first variations representing information recorded on the record carrier, said information being recoverable by a controllable type of data processing;

and second variations of a second physical parameter of the track tracks, a modulation pattern of the second variations representing a code for controlling said type of data processing, the modulation pattern including multiple modulations per track, in which, with respect to a code track comprising a series of laterally adjacent tracks each comprise said modulation pattern, the series of tracks including;

a code track, a left neighboring track on the left of and laterally adjacent to the code track, and a right neighboring track on the right of and laterally adjacent to the code track, a the modulation pattern in a the left neighboring track is aligned to a with the modulation pattern in a the right neighboring track, the alignment of the multiple modulations per track continuing substantially the entire circumferential length of the code track, the playback device comprising;

reading means for generating a read signal in dependence depending on the first variations;

demodulation means for retrieving the code from the modulation pattern of the second variations; and

data processing means for processing the read signal for recovering the information in dependence depending on the code,

characterized in that the device comprises means for retrieving the code from at least two tracks and comparing at least two of the codes to verify the code.

10. The playback device as claimed in claim 9, in which only tracks in a limited area of multiple tracks of the record carrier exhibit said second variations, and a further area of multiple tracks of the record carrier, outside the limited area, do not exhibit said second variations, wherein the playback device further comprises:

means for locating the limited area, wherein the limited area and the further area of multiple tracks of the record carrier each comprise a respective consecutive series of multiple laterally adjacent tracks.

11. A record carrier comprising substantially parallel tracks having:

first variations of a first physical parameter of the tracks, the first variations representing information recorded on the record carrier, which information is recoverable by means of a controllable type of data processing; and

second variations of a second physical parameter of the tracks, a modulation pattern of the second variations representing a code for controlling said type of data processing,

wherein the record carrier comprises a limited area of multiple tracks where the tracks exhibit the second variations, and a further area of multiple tracks, outside the limited area of multiple tracks, where the tracks do not exhibit the second variations, wherein the limited area and the further area of multiple tracks of the record carrier each comprise a respective consecutive series of multiple laterally adjacent tracks.

13. The record carrier as claimed in claim 11, wherein the record carrier comprises limited area address information stored as data in the track for locating the limited area of multiple tracks.

14. The record carrier as claimed in claim 11, wherein the second variations are displacements of the track in a direction transverse to the longitudinal direction of the track.

15. The record carrier as claimed in claim 11, wherein the tracks constitute a spiral or concentric pattern of tracks, and laterally adjacent tracks in the pattern of tracks exhibit a same number of the second variations.

12. A record carrier comprising substantially parallel tracks having:

first variations of a first physical parameter of the tracks, the first variations representing information recorded on the record carrier, which information is recoverable by means of a controllable type of data processing; and

second variations of a second physical parameter of the tracks, a modulation pattern of the second variations representing a code for controlling said type of data processing,

wherein the record carrier comprises a limited area of multiple tracks where the tracks exhibit the second variations, and a further area of multiple tracks, outside the limited area, where the tracks do not exhibit the second variations, wherein areas of multiple tracks of the record carrier are each defined by a respective consecutive series of multiple laterally adjacent tracks, wherein the limited area of multiple tracks comprises a boundary area of multiple tracks and a center area of multiple tracks, in which the tracks exhibit the second variations at a predetermined amplitude in the center area of multiple tracks, and in which the amplitude of the second variations increases gradually from zero to the predetermined amplitude in the boundary area of multiple tracks.

16. A method of recording information on a record carrier, said method comprising the steps of:

providing the record carrier with substantially parallel tracks,

encoding the information in first variations of a first physical parameter of the tracks, said information being recoverable by a controllable type of data processing,

providing the tracks with second variations of a second physical parameter of the tracks, and

encoding a code for controlling said type of data processing in a modulation pattern of the second variations,

providing the record carrier with a limited area of multiple tracks where the tracks exhibit the second variations, and a further area of multiple tracks, outside the limited area, where the tracks do not exhibit the second variations, wherein the limited area and further area of multiple tracks of the record carrier each comprise a respective consecutive series of multiple laterally adjacent tracks.

17. The method as claimed in claim 16, wherein the record carrier is rotated, and the method further comprises the step of:

controlling the steps of providing the second variations and encoding the code in the modulation pattern of the second variations depending on said rotation.

18. A playback device for recovering information from a record carrier with substantially parallel tracks having first variations of a first physical parameter of the tracks, the first variations representing information recorded on the record carrier, said information being recoverable by a controllable type of data processing;

and second variations of a second physical parameter of the tracks, a modulation pattern of the second variations representing a code for controlling said type of data processing, and a limited area of multiple tracks where the tracks exhibit the second variations, and a further area of multiple tracks, outside the limited area of multiple tracks, where the tracks do not exhibit the second variations, wherein the limited area and the further area of multiple tracks of the record carrier each comprise a respective consecutive series of multiple laterally adjacent tracks, the device comprising;

reading means for generating a read signal depending on the first variations;

demodulation means for retrieving the code from the modulation pattern of the second variations; and

data processing means for processing the read signal for recovering the information depending on the code,

means for locating the limited area of multiple tracks for retrieving the code from the modulation pattern of the second variations of the tracks in the limited area of multiple tracks.

20. The playback device as claimed in claim 18, wherein the playback device further comprises:

means for retrieving from the record carrier limited area address information for locating the limited area of multiple tracks.

19. A playback device for recovering information from a record carrier with substantially parallel tracks, having first variations of a first physical parameter of the tracks, the first variations representing information recorded on the record carrier, said information being recoverable by a controllable type of data processing;

and second variations of a second physical parameter of the tracks, a modulation pattern of the second variations representing a code for controlling said type of data processing, and a limited area of multiple tracks where the tracks exhibit the second variations, and a further area of multiple tracks, outside the limited area, where the tracks do not exhibit the second variations, wherein areas of tracks of the record carrier are each defined by a respective consecutive series of multiple laterally adjacent tracks, the device comprising;

reading means for generating a read signal depending on the first variations;

demodulation means for retrieving the code from the modulation pattern of the second variations; and

data processing means for processing the read signal for recovering the information depending on the code,

means for locating the limited area for retrieving the code from the modulation pattern of the second variations of the tracks in the limited area,

a memory containing predetermined limited area address information for locating the limited area.

21. A playback device for recovering information from a record carrier comprising substantially parallel tracks having:

first variations of a first physical parameter of the tracks, the first variations representing information recorded on the record carrier, said information being recoverable by a controllable type of data processing; and

second variations of a second physical parameter of the tracks, a modulation pattern of the second variations representing a code for controlling said type of data processing, the modulation pattern including multiple modulations per track, in which a series of laterally adjacent tracks, each comprise said modulation pattern, the series of tracks including;

a code track, a left neighboring track on the left of and laterally adjacent to the code track, and a right neighboring track on the right of and laterally adjacent to the code track, the modulation pattern in the left neighboring track is aligned with the modulation pattern in the right neighboring track, the alignment of the multiple modulations per track continuing substantially the entire circumferential length of the code track, the playback device comprising;

a media reader to generate a read signal depending on the first variations;

a demodulator to retrieve the code from the modulation pattern of the second variations; and

an information processor to process the read signal to recover the information depending on the code, and to compare the code from at least two different tracks in order to verify the code.

22. A playback device for recovering information from a record carrier with substantially parallel tracks having first variations of a first physical parameter of the tracks, the first variations representing information recorded on the record carrier, said information being recoverable by a controllable type of data processing;

and second variations of a second physical parameter of the tracks, a modulation pattern of the second variations representing a code for controlling said type of data processing, and a limited area of multiple tracks where the tracks exhibit the second variations, and a further area of multiple tracks, outside the limited area of multiple tracks, where the tracks do not exhibit the second variations, wherein the limited area and the further area of multiple tracks of the record carrier each comprise a respective consecutive series of multiple laterally adjacent tracks, the device comprising;

a media reader to generate a read signal depending on the first variations;

a demodulator to retrieve the code from the modulation pattern of the second variations; and

a data processer to process the read signal to recover the information depending on the code, to locate the limited area of multiple tracks to retrieve the code from the modulation pattern of the second variations of the tracks in the limited area of multiple tracks.

23. A playback device for recovering information from a record carrier with substantially parallel tracks, having first variations of a first physical parameter of the tracks, the first variations representing information recorded on the record carrier, said information being recoverable by a controllable type of data processing;

and second variations of a second physical parameter of the tracks, a modulation pattern of the second variations representing a code for controlling said type of data processing, and a limited area of multiple tracks where the tracks exhibit the second variations, and a further area of multiple tracks, outside the limited area, where the tracks do not exhibit the second variations, wherein areas of tracks of the record carrier are each defined by a respective consecutive series of multiple laterally adjacent tracks, the device comprising;

a media reader to generate a read signal depending on the first variations;

a demodulator to retrieve the code from the modulation pattern of the second variations; and

a data processor to processes the read signal to recover the information depending on the code, and to locate the limited area to retrieve the code from the modulation pattern of the second variations of the tracks in the limited area,

a memory containing predetermined limited area address information for locating the limited area.