Patent EP0414518A2 successfully refreshed from Google Patents.
EP0414518A2
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EP
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Optical recording medium and method of and apparatus for recording and reproducing information therein
Assignee: Sony Corp
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Filing: 1990-08-22
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Granted: —
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Expires: 2010-08-22
Abstract
Abstract An optical recording medium for storing optically readable data includes at least one preformed recording track of predetermined width and extending in a predetermined recording direction, the recording track having a recordable region extending in the recording direction thereof for recording data containing clock signal components, the recording track being provided with predetermined offset portions extending in the direction of the width thereof representing offset recorded data, the offset portions being formed such that the offset recorded data has a frequency upon scanning the recording track related by an integral ration with respect to the clock signal components of the data. When principal information signals are recorded on the track of the recording medium, clock signals are produced with the use of the offset recorded data and, when the principal information signals are reproduced from the recording medium, the offset recorded data are used for accessing, so that record and reproduced clocking may be produced from signals wholly apart from the principal information signals recorded in the recording track. In addition, by providing offset portions of the recording tracks, it is possible to record information outside of the recordable region of the recording track. In one embodiment, the phases of clock components of the principal information signals are recorded therewith so that when these signals are reproduced, a phase locked loop produces reproduced clocking signals having a frequency based upon the offset data signals and a phase determined by the signals recorded in the recordable region. This serves to reduce the time required for frequency and phase capturing and eliminates the need to provide a lengthy clock capturing preamble region in the recording track.
Inventors
- 👤 Yoichiro Sako
- 👤 Tamotsu Yamagami
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 20:43
CPC Classifications
G; G11; G11B; G11B27/00; G11B27/10; G11B27/19; G11B27/24; G11B20/00; G11B20/10; G11B20/12; G11B20/1217; G11B20/1251; G11B27/28; G11B27/30; G11B27/3027; G11B7/00; G11B7/004; G11B7/007; G11B7/0079; G11B7/08; G11B7/09; G11B7/0938; G11B11/00; G11B11/10; G11B11/105; G11B11/1055; G11B11/10576; G11B11/10578; G11B2220/00; G11B2220/20; G11B2220/21; G11B2220/215; G11B2220/218; G11B2220/25; G11B2220/2525; G11B2220/2537; G11B2220/2545
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
101 words
An optical recording medium for storing optically readable data, comprising at least one preformed recording track of predetermined width and extending in a predetermined recording direction, said recording track having a recordable region extending in said recording direction thereof for recording data containing clock signal components, said recording track being provided with predetermined offset portions extending in the direction of the width thereof representing offset recorded data, said offset portions being formed such that said offset recorded data has a frequency upon scanning said recording track related by an integral ratio with respect to the clock signal components of the data.
Claim 2
Dependent Claim
101 words
An optical recording medium for storing optically readable data, comprising at least one preformed recording track of predetermined width and extending in a predetermined recording direction, said recording track having a recordable region extending in said recording direction thereof for recording data containing clock signal components, said recording track being provided with predetermined offset portions extending in the direction of the width thereof representing offset recorded data, said offset portions being formed such that said offset recorded data has a frequency upon scanning said recording track related by an integral ratio with respect to the clock signal components of the data.
Claim 3
Dependent Claim
57 words
An optical recording medium according to claim 1, wherein said recording track has a tracking error signal recorded therewith having a tracking error signal frequency upon scanning said track and wherein the frequency of the offset recorded data is distinguishably higher than the tracking error signal frequency of the tracking error signal obtained upon scanning said track.
Claim 4
Dependent Claim
31 words
An optical recording medium according to claim 2, wherein said offset recorded data includes predetermined frame sync signals each identifying a respective frame constituting an information recording unit of said data.
Claim 5
Dependent Claim
25 words
An optical recording medium according to claim 3, wherein said offset recorded data includes predetermined address information for addressing a predetermined number of said frames.
Claim 6
Dependent Claim
27 words
An optical recording medium according to claim 4, wherein said address information includes block address information for indicating a block constituting a respective plurality of said frames.
Claim 7
Dependent Claim
35 words
An optical recording medium according to claim 4, wherein said offset recorded data includes predetermined block leading edge information for identifying a leading edge of a corresponding block of frames recorded in said recording track.
Claim 8
Dependent Claim
32 words
An optical recording medium according to claim 6, wherein said offset recorded data includes predetermined information associated with each frame indicating whether said frame is the leading frame of the corresponding block
Claim 9
Dependent Claim
22 words
An optical recording medium according to any one of claims 1 to 7, wherein the optical recording medium is a magneto-optical disc.
Claim 10
Independent Claim
103 words
A method of recording principal information signals along a recording direction of a recording track provided in an optical recording medium, comprising the steps of: providing an optical recording medium having at least one recording track having predetermined offset regions extending in the direction of the width of said recording track, said offset regions being formed to provide offset recorded data including a clock signal component having a frequency bearing an integral ratio with respect to a clock frequency of said principal information signals; and recording said principal information signals with the use of clock signals obtained by reproducing the offset recorded data.
Claim 11
Independent Claim
103 words
A method of recording principal information signals along a recording direction of a recording track provided in an optical recording medium, comprising the steps of: providing an optical recording medium having at least one recording track having predetermined offset regions extending in the direction of the width of said recording track, said offset regions being formed to provide offset recorded data including a clock signal component having a frequency bearing an integral ratio with respect to a clock frequency of said principal information signals; and recording said principal information signals with the use of clock signals obtained by reproducing the offset recorded data.
Claim 12
Dependent Claim
50 words
A method according to claim 9, wherein said step of recording said principal information signals comprises recording said principal information signals with the use of a recording head controlled on the basis of said offset recorded data so that said recording head is thereby positioned to record the principal information.
Claim 13
Dependent Claim
40 words
A method according to claim 9 or 10, wherein the step of recording said principal information signals includes recording phase capturing signals thereof in a predetermined region on the recording track of said recording medium along the recording direction thereof.
Claim 14
Independent Claim
95 words
A method of reproducing principal information signals recorded along a recording direction of a recording track formed in an optical recording medium, said recording track having predetermined portions offset with respect to a width thereof representing offset recorded data including clock signal components having a frequency bearing an integral ratio with respect to a clock frequency of said principal information signals, comprising the steps of: reproducing said offset data signals; producing clock signals with the use of the reproduced offset data signals; and reproducing said principal information signals with the use of said clock signals.
Claim 15
Independent Claim
95 words
A method of reproducing principal information signals recorded along a recording direction of a recording track formed in an optical recording medium, said recording track having predetermined portions offset with respect to a width thereof representing offset recorded data including clock signal components having a frequency bearing an integral ratio with respect to a clock frequency of said principal information signals, comprising the steps of: reproducing said offset data signals; producing clock signals with the use of the reproduced offset data signals; and reproducing said principal information signals with the use of said clock signals.
Claim 16
Dependent Claim
51 words
A method according to claim 12, wherein said step of reproducing said principal information signals comprises reproducing said principal information signals with the use of a reproducing head controlled on the basis of said offset data signals so that said reproducing head is thereby positioned to reproduced the principal information signals.
Claim 17
Dependent Claim
62 words
A method according to claim 12 or 13, wherein the recording track has signals of a predetermined pattern recorded along the recording direction thereof, and wherein the step of producing said clock signals comprises producing said clock signals having a frequency determined on the basis of said offset data signals and having a phase determined by said signals of a predetermined pattern.
Claim 18
Dependent Claim
112 words
Apparatus for recording principal information signals along a recording direction of a recording track provided in an optical recording medium, the recording medium having at least one recording track having predetermined offset regions extending in the direction of the width of said recording track, said offset regions being formed to provide offset recorded data including a clock signal component having a frequency bearing an integral ratio with respect to a clock frequency of said principal information signals; the apparatus comprising: means for reproducing the offset recorded data; means for deriving clock signals from the reproduced offset recorded data and means for recording said principal information signals uding the clock signals so derived.
Claim 19
Dependent Claim
112 words
Apparatus for recording principal information signals along a recording direction of a recording track provided in an optical recording medium, the recording medium having at least one recording track having predetermined offset regions extending in the direction of the width of said recording track, said offset regions being formed to provide offset recorded data including a clock signal component having a frequency bearing an integral ratio with respect to a clock frequency of said principal information signals; the apparatus comprising: means for reproducing the offset recorded data; means for deriving clock signals from the reproduced offset recorded data and means for recording said principal information signals uding the clock signals so derived.
Claim 20
Dependent Claim
97 words
Apparatus for reproducing principal information signals recorded along a recording direction of a recording track formed in an optical recording medium, said recording track having predetermined portions offset with respect to a width thereof representing offset recorded data including clock signal components having a frequency bearing an integral ratio with respect to a clock frequency of said principal information signals, comprising: means for reproducing said offset data signals; means for producing clock signals with the use of the reproduced offset data signals; and means for reproducing said principal information signals with the use of said clock signals.
Claim 21
Dependent Claim
97 words
Apparatus for reproducing principal information signals recorded along a recording direction of a recording track formed in an optical recording medium, said recording track having predetermined portions offset with respect to a width thereof representing offset recorded data including clock signal components having a frequency bearing an integral ratio with respect to a clock frequency of said principal information signals, comprising: means for reproducing said offset data signals; means for producing clock signals with the use of the reproduced offset data signals; and means for reproducing said principal information signals with the use of said clock signals.
References Cited (Backward Citations)
No citation records indexed.
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