Patent US5708640A successfully refreshed from Google Patents.
US5708640A
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US
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Information reproducing method and apparatus
Assignee: Hitachi Ltd
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Filing: 1996-03-11
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Granted: 1998-01-13
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Expires: 2016-03-11
Abstract
Abstract An information reproducing apparatus, in which information is recorded in correspondence to the leading edge and the trailing edge of each mark and a deviation of a relative position between leading edge data and trailing edge data is corrected using each synchronization signal (sync signal), is provided with leading edge pattern A, B detector circuits and trailing edge pattern A, B detector circuits for detecting a sync signal together with data before or after the sync signal which is limited to one or a plurality of predetermined patterns due to intersymbol correlation with the sync signal.
Inventors
- 👤 Yasushi Fukuda
- 👤 Youichi Saigou
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 10:17
CPC Classifications
G; G11; G11B; G11B27/00; G11B27/10; G11B27/19; G11B27/28; G11B27/30; G11B27/3027; G11B20/00; G11B20/10; G11B20/14; G11B20/1403; G11B20/1423; G11B20/1426; G11B7/00; G11B7/004; G11B7/005
Claims Analysis
Total Claims: 29
Claim 1
Independent Claim
134 words
A method of reproducing information from an information recording medium on which said information is recorded as state transition patterns, comprising the steps of: reading information from said information recording medium, said information including an information signal and synchronization (sync) signals inserted in at least one location in said information signal, wherein possible patterns taken by part of said information signal before or after said sync signal are limited to a predetermined number, which is at least one or more, due to intersymbol interference with said sync signal; detecting, from said read information, a pattern which coincides with said sync signal and any of said predetermined number of patterns of the part of said information signal; and reproducing said read information signal with a detection timing of said coincident pattern used as a reference.
Claim 2
Independent Claim
134 words
A method of reproducing information from an information recording medium on which said information is recorded as state transition patterns, comprising the steps of: reading information from said information recording medium, said information including an information signal and synchronization (sync) signals inserted in at least one location in said information signal, wherein possible patterns taken by part of said information signal before or after said sync signal are limited to a predetermined number, which is at least one or more, due to intersymbol interference with said sync signal; detecting, from said read information, a pattern which coincides with said sync signal and any of said predetermined number of patterns of the part of said information signal; and reproducing said read information signal with a detection timing of said coincident pattern used as a reference.
Claim 3
Dependent Claim
43 words
A method according to claim 1, wherein said information signal is recorded on said recording medium in accordance with an edge recording method wherein the leading edge and the trailing edge of said state transition pattern are each made to correspond to "1"
Claim 4
Dependent Claim
22 words
A method according to claim 1, wherein said information signal is 1-7 modulated and recorded as it is on said recording medium.
Claim 5
Dependent Claim
43 words
A method according to claim 1, wherein possible patterns taken by said sync signal are limited to a predetermined number, which is at least one or more, due to intersymbol interference with part of said information signal before or after said sync signal.
Claim 6
Independent Claim
138 words
An apparatus for reproducing information from an information recording medium on which said information is recorded as state transition patterns, comprising: means for reading said information from said recording medium, said information including an information signal and sync signals inserted at at least one location in said information signal, wherein possible patterns taken by part of said information signal before or after said sync signal are limited to a predetermined number, which is at least one or more, due to an intersymbol interference with said sync signal; means for detecting, from said read information, a pattern which coincides with said sync signal and any of said predetermined number of patterns of the part of said information signal; and demodulating means for reproducing said read information signal with a detection timing of said coincident pattern used as a reference.
Claim 7
Independent Claim
138 words
An apparatus for reproducing information from an information recording medium on which said information is recorded as state transition patterns, comprising: means for reading said information from said recording medium, said information including an information signal and sync signals inserted at at least one location in said information signal, wherein possible patterns taken by part of said information signal before or after said sync signal are limited to a predetermined number, which is at least one or more, due to an intersymbol interference with said sync signal; means for detecting, from said read information, a pattern which coincides with said sync signal and any of said predetermined number of patterns of the part of said information signal; and demodulating means for reproducing said read information signal with a detection timing of said coincident pattern used as a reference.
Claim 8
Dependent Claim
43 words
An apparatus according to claim 5, wherein said information signal is recorded on said recording medium in accordance with an edge recording method wherein the leading edge and the trailing edge of said state transition pattern are each made to correspond to "1".
Claim 9
Dependent Claim
19 words
An apparatus according to claim 5, wherein said information signal is 1-7 modulated and recorded on said recording medium.
Claim 10
Dependent Claim
36 words
An apparatus according to claim 5, wherein state transition patterns of said sync signal are limited to a predetermined number of state transition patterns due to an intersymbol interference, said predetermined number being at least one.
Claim 11
Independent Claim
151 words
An apparatus for reproducing information from a recording medium on which said information is recorded as state transition patterns, comprising: an optical head unit, wherein said information includes an information signal and sync signals inserted at at least one location in said information signal, and possible patterns taken by part of said information signal before or after said sync signal are limited to a predetermined number, which is at least one or more, due to intersymbol interference with said sync signal; a detector circuit connected to said optical head unit for detecting a pattern which coincides with said sync signal and any of said plurality of number of patterns of the part of said information signal from said information read by said optical disk unit; and a demodulator circuit connected to said detector circuit for reproducing said information signal with a detection timing of said coincident pattern used as a reference.
Claim 12
Independent Claim
151 words
An apparatus for reproducing information from a recording medium on which said information is recorded as state transition patterns, comprising: an optical head unit, wherein said information includes an information signal and sync signals inserted at at least one location in said information signal, and possible patterns taken by part of said information signal before or after said sync signal are limited to a predetermined number, which is at least one or more, due to intersymbol interference with said sync signal; a detector circuit connected to said optical head unit for detecting a pattern which coincides with said sync signal and any of said plurality of number of patterns of the part of said information signal from said information read by said optical disk unit; and a demodulator circuit connected to said detector circuit for reproducing said information signal with a detection timing of said coincident pattern used as a reference.
Claim 13
Dependent Claim
43 words
An apparatus according to claim 9, wherein said information signal is recorded on said recording medium in accordance with an edge recording method wherein the leading edge and the trailing edge of said state transition pattern are each made to correspond to "1".
Claim 14
Dependent Claim
22 words
An apparatus according to claim 9, wherein said information signal is 1-7 modulated and recorded as it is on said recording medium.
Claim 15
Dependent Claim
41 words
An apparatus according to claim 9, wherein possible patterns taken by said sync signal are limited to a predetermined number, which is at least one or more, due to intersymbol interference with said information signal before or after said sync signal.
Claim 16
Independent Claim
174 words
A method of reproducing an information signal from a recording medium on which information is recorded as state transition patterns, comprising the steps of: reading information from said recording medium, said information including an information signal and sync signals inserted at at least one location in said information signal, wherein possible patterns taken by said sync signal are limited to a predetermined number, which is at least one or more, due to intersymbol interference with the information signal before or after said sync signal, and possible patterns taken by part of said information signal before or after said sync signal are limited to a predetermined number, which is at least one or more, due to intersymbol interference with said sync signal; detecting a pattern which coincides with a pattern made up of any one of said predetermined number of patterns taken by said sync signal and the part of said information signal from said read information; and reproducing said read information signal with a detection timing of said coincident pattern used as a reference.
Claim 17
Independent Claim
174 words
A method of reproducing an information signal from a recording medium on which information is recorded as state transition patterns, comprising the steps of: reading information from said recording medium, said information including an information signal and sync signals inserted at at least one location in said information signal, wherein possible patterns taken by said sync signal are limited to a predetermined number, which is at least one or more, due to intersymbol interference with the information signal before or after said sync signal, and possible patterns taken by part of said information signal before or after said sync signal are limited to a predetermined number, which is at least one or more, due to intersymbol interference with said sync signal; detecting a pattern which coincides with a pattern made up of any one of said predetermined number of patterns taken by said sync signal and the part of said information signal from said read information; and reproducing said read information signal with a detection timing of said coincident pattern used as a reference.
Claim 18
Dependent Claim
42 words
A method according to claim 13, wherein said information is recorded on said recording medium in accordance with an edge recording method wherein the leading edge and the trailing edge of said state transition pattern are each made to correspond to "1".
Claim 19
Dependent Claim
19 words
A method according to claim 13, wherein said information is 2-7 RLL modulated and recorded on said recording medium.
Claim 20
Independent Claim
178 words
An apparatus for reproducing an information signal from a recording medium on which information is recorded as state transition patterns, comprising: means for reading information from said recording medium, said information including an information signal and sync signals inserted at at least one location in said information signal, wherein possible patterns taken by said sync signal are limited to a predetermined number, which is at least one or more, due to intersymbol interference with an information signal before or after said sync signal, and possible patterns taken by part of said information signal before or after said sync signal are limited to a predetermined number, which is at least one or more, due to intersymbol interference with said sync signal; means for detecting a pattern which coincides with a pattern made up of any one of said predetermined number of patterns taken by said sync signal and the part of said information signal from said read information; and reproducing means for demodulating said read information signal with a detection timing of said coincident pattern used as a reference.
Claim 21
Independent Claim
178 words
An apparatus for reproducing an information signal from a recording medium on which information is recorded as state transition patterns, comprising: means for reading information from said recording medium, said information including an information signal and sync signals inserted at at least one location in said information signal, wherein possible patterns taken by said sync signal are limited to a predetermined number, which is at least one or more, due to intersymbol interference with an information signal before or after said sync signal, and possible patterns taken by part of said information signal before or after said sync signal are limited to a predetermined number, which is at least one or more, due to intersymbol interference with said sync signal; means for detecting a pattern which coincides with a pattern made up of any one of said predetermined number of patterns taken by said sync signal and the part of said information signal from said read information; and reproducing means for demodulating said read information signal with a detection timing of said coincident pattern used as a reference.
Claim 22
Dependent Claim
41 words
An apparatus according to claim 16, wherein said information is recorded on said recording medium in accordance with an edge recording method wherein the leading edge and the trailing edge of said state transition pattern are made to correspond to "1".
Claim 23
Dependent Claim
19 words
An apparatus according to claim 16, wherein said information is 2-7 RLL modulated and recorded on said recording medium.
Claim 24
Independent Claim
190 words
An apparatus for reproducing an information signal from a recording medium on which information is recorded as state transition patterns, comprising: an optical head unit, said information including an information signal and sync signals inserted at at least one location in said information signal, wherein possible patterns taken by said sync signal are limited to a predetermined number, which is at least one or more, due to intersymbol interference with said information signal before or after said sync signal, and possible patterns taken by part of said information signal before or after said sync signal are limited to a predetermined number, which is at least one or more, due to intersymbol interference with said sync signal; a detector circuit connected to said optical head unit for detecting a pattern coincident with a pattern including any one of said predetermined number of patterns taken by said sync signal and the part of said information signal from said read information; and a reproducing circuit connected to said optical head unit and said detector circuit for demodulating said read information signal with a detection timing of said coincident pattern used as a reference.
Claim 25
Independent Claim
190 words
An apparatus for reproducing an information signal from a recording medium on which information is recorded as state transition patterns, comprising: an optical head unit, said information including an information signal and sync signals inserted at at least one location in said information signal, wherein possible patterns taken by said sync signal are limited to a predetermined number, which is at least one or more, due to intersymbol interference with said information signal before or after said sync signal, and possible patterns taken by part of said information signal before or after said sync signal are limited to a predetermined number, which is at least one or more, due to intersymbol interference with said sync signal; a detector circuit connected to said optical head unit for detecting a pattern coincident with a pattern including any one of said predetermined number of patterns taken by said sync signal and the part of said information signal from said read information; and a reproducing circuit connected to said optical head unit and said detector circuit for demodulating said read information signal with a detection timing of said coincident pattern used as a reference.
Claim 26
Dependent Claim
42 words
An apparatus according to claim 19, wherein said information is recorded on said recording medium in accordance with an edge recording method wherein the leading edge and the trailing edge of said state transition pattern are each made to correspond to "1".
Claim 27
Dependent Claim
19 words
An apparatus according to claim 19, wherein said information is 2-7 RLL modulated and recorded on said recording medium.
Claim 28
Dependent Claim
368 words
An information reproducing apparatus comprising: a recording medium on which information is recorded as state transition patterns, said information including an information signal and a sync pattern inserted at at least one location in said information signal, wherein said sync pattern is limited to one or a plurality of kinds due to intersymbol interference with an information signal before or after said sync pattern, and the information signal before or after said sync pattern is limited to one or a plurality of kinds due to intersymbol interference with said sync pattern; means for reproducing said information signal and said sync pattern from said recording medium; means for separating reproduced signals into leading edge data and trailing edge data; means for previously storing a leading edge sync signal pattern and a trailing edge sync signal pattern; means for comparing each sync signal pattern in said leading edge data and said trailing edge data separated from said reproduced signals with said previously stored leading edge sync signal pattern and trailing edge sync signal pattern and for detecting a leading edge sync signal and a trailing edge sync signal, respectively, when coincidence therebetween is determined; means for performing a correction so as to match a synchronization position indicated by said detected leading edge sync signal with a synchronization position indicated by said trailing edge sync signal and for generating composite data from said leading and trailing edge sync signals; means for previously storing one or a plurality of leading edge sync signal patterns and trailing edge sync signal patterns each including said sync pattern and an information signal before or after said sync pattern; and means for comparing each sync signal pattern in said leading edge data and said trailing edge data separated from said reproduced signals with each of said previously stored one or plurality of leading edge sync signal patterns and trailing edge sync signal patterns and for detecting a leading edge sync signal and a trailing edge sync signal when said reproduced sync signal patterns in said leading edge data and said trailing edge data coincide with any of said stored leading edge sync signal patterns and with any of said stored trailing edge sync signal patterns, respectively.
Claim 29
Dependent Claim
368 words
An information reproducing apparatus comprising: a recording medium on which information is recorded as state transition patterns, said information including an information signal and a sync pattern inserted at at least one location in said information signal, wherein said sync pattern is limited to one or a plurality of kinds due to intersymbol interference with an information signal before or after said sync pattern, and the information signal before or after said sync pattern is limited to one or a plurality of kinds due to intersymbol interference with said sync pattern; means for reproducing said information signal and said sync pattern from said recording medium; means for separating reproduced signals into leading edge data and trailing edge data; means for previously storing a leading edge sync signal pattern and a trailing edge sync signal pattern; means for comparing each sync signal pattern in said leading edge data and said trailing edge data separated from said reproduced signals with said previously stored leading edge sync signal pattern and trailing edge sync signal pattern and for detecting a leading edge sync signal and a trailing edge sync signal, respectively, when coincidence therebetween is determined; means for performing a correction so as to match a synchronization position indicated by said detected leading edge sync signal with a synchronization position indicated by said trailing edge sync signal and for generating composite data from said leading and trailing edge sync signals; means for previously storing one or a plurality of leading edge sync signal patterns and trailing edge sync signal patterns each including said sync pattern and an information signal before or after said sync pattern; and means for comparing each sync signal pattern in said leading edge data and said trailing edge data separated from said reproduced signals with each of said previously stored one or plurality of leading edge sync signal patterns and trailing edge sync signal patterns and for detecting a leading edge sync signal and a trailing edge sync signal when said reproduced sync signal patterns in said leading edge data and said trailing edge data coincide with any of said stored leading edge sync signal patterns and with any of said stored trailing edge sync signal patterns, respectively.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-01-12 | 2001-07-14 | 2002-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-01-12 | 2005-07-14 | 2006-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-01-12 | 2009-07-14 | 2010-01-13 | $7700.00 | Window Closed / Lapsed |