EP0420179A2 — Data recording/reproducing method and device

Claim 1

Independent Claim 155 words

An information recording device for recording information on a recording medium by forming a status transition pattern, comprising: modulation means (7) for converting the information to be recorded into recording data in the form of a run-length-limited code in accordance with a predetermined conversion rule; storage means (8) for storing a sync (synchronization) signal to be inserted into said recording data; switching means (9) for inserting the sync signal in accordance with a predetermined format; NRZI conversion means (10) for NRZI-converting said recording data; and writing means (2) for writing a status transition pattern (25) on the recording medium on the basis of the NRZI-converted recording data; wherein said storage means stores a code train capable of deciding that the sync signal includes a code not existing in the conversion rule of converting information into a run-length-limited code during reproduction using a leading edge data (26) or trailing edge data (27) relative to the pattern.

Claim 2

Dependent Claim 155 words

An information recording device for recording information on a recording medium by forming a status transition pattern, comprising: modulation means (7) for converting the information to be recorded into recording data in the form of a run-length-limited code in accordance with a predetermined conversion rule; storage means (8) for storing a sync (synchronization) signal to be inserted into said recording data; switching means (9) for inserting the sync signal in accordance with a predetermined format; NRZI conversion means (10) for NRZI-converting said recording data; and writing means (2) for writing a status transition pattern (25) on the recording medium on the basis of the NRZI-converted recording data; wherein said storage means stores a code train capable of deciding that the sync signal includes a code not existing in the conversion rule of converting information into a run-length-limited code during reproduction using a leading edge data (26) or trailing edge data (27) relative to the pattern.

Claim 3

Dependent Claim 154 words

An information reproducing device for reproducing the information recorded on a recording medium (1), comprising: means for detecting signals indicative of positions of the leading edge and trailing edge of the status transition pattern recorded on the recording medium; means (13) for separating said detected signals into a leading edge data corresponding to the leading edge of said transition pattern and a trailing edge data corresponding to the trailing edge data thereof; means (16, 17) for detecting sync signals inserted in the information recorded on the recording medium on the basis of said leading edge data and said trailing edge data, respectively; and means (18) for correcting a change in the relative positional relationship between the leading edge data and trailing edge data by causing the re-synchronization positions based on the detected sync signals to agree with each other, and composing the leading edge data and the trailing edge data to provide reproduced data.

Claim 4

Dependent Claim 154 words

An information reproducing device for reproducing the information recorded on a recording medium (1), comprising: means for detecting signals indicative of positions of the leading edge and trailing edge of the status transition pattern recorded on the recording medium; means (13) for separating said detected signals into a leading edge data corresponding to the leading edge of said transition pattern and a trailing edge data corresponding to the trailing edge data thereof; means (16, 17) for detecting sync signals inserted in the information recorded on the recording medium on the basis of said leading edge data and said trailing edge data, respectively; and means (18) for correcting a change in the relative positional relationship between the leading edge data and trailing edge data by causing the re-synchronization positions based on the detected sync signals to agree with each other, and composing the leading edge data and the trailing edge data to provide reproduced data.

Claim 5

Dependent Claim 34 words

An information reproducing device according to claim 2, wherein the sync signal is a code train which can be decided not to exist in the conversion rule of converting information into the run-length-limited code.

Claim 6

Independent Claim 110 words

A method for recording information on a recording medium (1) in the form of a status transition pattern, comprising the steps of: converting the first information train to be recorded into a code train in the form of a run-length-limited code in accordance with a predetermined conversion rule; inserting a sync signal in said code train at regular intervals to provide a second information train; physically forming a status transition pattern on the recording medium so that its leading edge and trailing edge correspond to said second information train; and preparing, as said sync signal, a code not existing in the conversion rule of converting information into said run-length-limited code.

Claim 7

Independent Claim 110 words

A method for recording information on a recording medium (1) in the form of a status transition pattern, comprising the steps of: converting the first information train to be recorded into a code train in the form of a run-length-limited code in accordance with a predetermined conversion rule; inserting a sync signal in said code train at regular intervals to provide a second information train; physically forming a status transition pattern on the recording medium so that its leading edge and trailing edge correspond to said second information train; and preparing, as said sync signal, a code not existing in the conversion rule of converting information into said run-length-limited code.

Claim 8

Dependent Claim 93 words

An information recording method according to claim 4, wherein in the case where a combination of a first code train and a second code train in which the second code train with a minimum or maximum run-length in the run-length-limited code follows immediately after the first code train with a maximum or minimum run-length is not included in the conversion rule of converting information into a run-length-limited code, as said sync signal, a sync signal which includes repetition of the second code train immediately after repetition of the first code train is used.

Claim 9

Dependent Claim 119 words

An information recording method according to claim 4, wherein in the case where a combination of code trains in which the code train with a minimum run-length in the run-length-limited code follows immediately after the code train a maximum run-length is not included in the conversion rule of converting information into a run-length-limited code, as said sync signal, a sync signal which includes repetition of the above minimum run-length code train following immediately after the code train having a length equal to the repetition of maximum run-length code train and consisting of a code train longer than the maximum run-length code train in a front part and another code train shorter than it in a rear part is used.

Claim 10

Dependent Claim 110 words

An information recording method according to claim 4, wherein a first sync signal and a second sync signal as said sync signal are changed according to the status of the place immediately before the place where the sync signal is to be inserted, and said first sync signal is not included in the conversion rule of converting information into the run-length-limited code and has a first code train with an odd number of intermediate inverted code(s), and said second sync signal is also not included in the conversion rule of converting information into the run-length-limited code and has no intermediate inverted code or has an even number of inverted codes.

Claim 11

Dependent Claim 34 words

An information recording method according to claim 4, wherein said run-length-limited code is a 2 - 7 (two-to-seven) code, and said sync signal includes either of the following code trains a. "10000000100000001001001" b. "10000000010000001001001"

Claim 12

Dependent Claim 56 words

An information recording method according to claim 4, wherein said sync signal is equal, in the number of its inverted parts, i.e. logic '0's, to that in a code train in which code trains are combined to provide a maximum total run-length in the run-length-limited code, and includes a code train longer than that code train.

Claim 13

Dependent Claim 56 words

An information recording method according to claim 4, wherein said sync signal is equal, in the number of its inverted parts, i.e. logic '0's, to that in a code train in which code trains are combined to provide a minimum total run-length in the run-length-limited code, and includes a code train shorter than that code train.

Claim 14

Independent Claim 121 words

A method for recording/reproducing information on a disk comprising the steps of: rotating the disk at a fixed speed, said disk comprising a large number of tracks formed thereon, each of said tracks divided into a plurality of sectors; converting the information to be recorded on a sector on the disk into a first code train in accordance with a predetermined conversion rule; predetermining as a sync signal the pattern not existing in said conversion rule; inserting said pattern at regular intervals in said first code train to provide a second code train; NRZI-converting said second code train; and driving a head in accordance with said NRZI converted signal to form a physical pattern consisting of successive pits on the sector.

Claim 15

Independent Claim 121 words

A method for recording/reproducing information on a disk comprising the steps of: rotating the disk at a fixed speed, said disk comprising a large number of tracks formed thereon, each of said tracks divided into a plurality of sectors; converting the information to be recorded on a sector on the disk into a first code train in accordance with a predetermined conversion rule; predetermining as a sync signal the pattern not existing in said conversion rule; inserting said pattern at regular intervals in said first code train to provide a second code train; NRZI-converting said second code train; and driving a head in accordance with said NRZI converted signal to form a physical pattern consisting of successive pits on the sector.

Claim 16

Dependent Claim 34 words

An information recording/reproducing method according to claim 11, further comprising the step of reproducing the information, wherein said sync signal inserted in said second code train is used for re-synchronization in reproducing the information.

Claim 17

Dependent Claim 34 words

An information recording/reproducing method according to claim 12, wherein said run-length-limited code is a 2 - 7 (two-to-seven) code, and said sync signal includes either of the following code trains a. "10000000100000001001001" b. "10000000010000001001001"

Data recording/reproducing method and device

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