EP0419239A2
Expired / Lapsed
EP
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Information-recording method and medium
Assignee: Sony Corp
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Filing: 1990-09-19
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Granted: —
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Expires: 2010-09-19
Abstract
Abstract A method of recording information is provided, in which a first signal is recorded along the length of a recording track previously formed on a recording medium. On the recording track, a second signal is pre-recorded by offsetting the track in its width direction. During the recording of the first signal, the points of transition of the first signal are positioned so as to be spaced apart from, and therefore unaffected by, the points of transition of the second signal. Also, by including a clock synchronisation signal in the first signal, PLL capture may be achieved accurately in a shorter time. In addition, the unit of phase shift between the channel clock of the first signal and the channel clock of the second signal is set to be shorter than the channel clock bit. A data recording method and an optical data recording method are also provided, which may be suitable applied to a magneto-optical disc or the like. The data are previously modulated by a modulation system satisfying a predetermined rule of modulation and include connection bits between adjacent units of the modulated data by way of further modulation. Control information is recorded by offsetting the track along its width, while the points of transition of the track along its width coincide with the recording region for the connecting bits, since the latter are not part of the main signal information.
Inventors
- 👤 Tamotsu Yamagami
- 👤 Yoichiro Sako
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-29 15:08
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/08; G11B7/09; G11B7/0938; G11B7/24; G11B7/2407; G11B7/24073; G11B7/24082; G11B11/00; G11B11/10; G11B11/105; G11B11/1055; G11B11/10576; G11B11/10578
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
120 words
A method of recording information comprising the steps of: pre-forming on an optical recording medium a recording track which is elongate in a length direction and has at intervals along its length portions which are offset in a width direction perpendicular to the length direction; recording a first information signal along the length direction of the recording track, there being points of transition between successive portions of the first information signal; wherein the offset portions of the recording track constitute points of transition of a second information signal; and further comprising the step of arranging the points of transition of the first information signal so that they are spaced apart from the points of transition of the second information signal.
Claim 2
Independent Claim
120 words
A method of recording information comprising the steps of: pre-forming on an optical recording medium a recording track which is elongate in a length direction and has at intervals along its length portions which are offset in a width direction perpendicular to the length direction; recording a first information signal along the length direction of the recording track, there being points of transition between successive portions of the first information signal; wherein the offset portions of the recording track constitute points of transition of a second information signal; and further comprising the step of arranging the points of transition of the first information signal so that they are spaced apart from the points of transition of the second information signal.
Claim 3
Dependent Claim
25 words
A method according to claim 1 wherein a portion of the first information signal has a predetermined pattern for synchronisation of the first information signal.
Claim 4
Dependent Claim
55 words
A method according to claim 1 or 2 wherein the first information signal is recorded in accordance with a recording clock of a given duration and so that there is a phase shift between the respective points of transition of the first and second information signals, the phase shift being shorter than said given duration.
Claim 5
Independent Claim
21 words
A method according to anyone of claims 1 to 3 comprising the step of forming the recording track as a signal.
Claim 6
Independent Claim
21 words
A method according to any one of the preceding claims comprising the step of forming the recording track as concentric circles.
Claim 7
Independent Claim
122 words
A method of recording information comprising the steps of: pre-forming on an optical recording medium a recording track which is elongate in a length direction and has at intervals along its length portions which are offset in a width direction perpendicular to the length direction; recording a first information signal along the length direction of the recording track; modulating the first information signal and employing in the modulation redundant bits at spaced apart regions so as to satisfy a predetermined modulation rule; wherein the offset portions of the recording track constitute points of transition of a second information signal; and further comprising the step of arranging said spaced apart regions so that they include the points of transition of the second signals.
Claim 8
Independent Claim
122 words
A method of recording information comprising the steps of: pre-forming on an optical recording medium a recording track which is elongate in a length direction and has at intervals along its length portions which are offset in a width direction perpendicular to the length direction; recording a first information signal along the length direction of the recording track; modulating the first information signal and employing in the modulation redundant bits at spaced apart regions so as to satisfy a predetermined modulation rule; wherein the offset portions of the recording track constitute points of transition of a second information signal; and further comprising the step of arranging said spaced apart regions so that they include the points of transition of the second signals.
Claim 9
Dependent Claim
17 words
A method according to claim 6 comprising the step of forming the recording track as a spiral.
Claim 10
Dependent Claim
17 words
A method according to claim 6 comprising the step of forming the recording track as concentric circles
Claim 11
Dependent Claim
155 words
An optical recording medium carrying recorded data which are readable by optical means, said optical recording medium comprising: a pre-formed recording track which is elongate in a length direction and has at intervals along its length portions which are offset in a width direction perpendicular to the length direction; a recordable region in the track; a first signal recorded along the track length in the recordable region, said first signal being modulated in modulation units having a predetermined period and a maximum transition interval to satisfy a predetermined modulating rule and including redundancy bits between consecutive units of modulated dots, by way of further modulation; periodic signals having a period bearing an integer ratio to said predetermined period; and a sync signal which is constituted by said offsets and undergoes a transition at an interval longer than the period of said periodic signals, said interval being a predetermined integer multiple of said maximum transition interval.
Claim 12
Dependent Claim
155 words
An optical recording medium carrying recorded data which are readable by optical means, said optical recording medium comprising: a pre-formed recording track which is elongate in a length direction and has at intervals along its length portions which are offset in a width direction perpendicular to the length direction; a recordable region in the track; a first signal recorded along the track length in the recordable region, said first signal being modulated in modulation units having a predetermined period and a maximum transition interval to satisfy a predetermined modulating rule and including redundancy bits between consecutive units of modulated dots, by way of further modulation; periodic signals having a period bearing an integer ratio to said predetermined period; and a sync signal which is constituted by said offsets and undergoes a transition at an interval longer than the period of said periodic signals, said interval being a predetermined integer multiple of said maximum transition interval.
Claim 13
Dependent Claim
14 words
An optical recording medium according to claim 9 and which is a magneto-optical disc.
Claim 14
Dependent Claim
21 words
An optical recording medium according to claim 9 or 10 wherein the recording track is in the form of a spiral.
Claim 15
Dependent Claim
21 words
An optical recording medium according to claim 9 or 10 wherein the recording track is in the form of concentric circles.
References Cited (Backward Citations)
No citation records indexed.
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