EP0403224A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Method of reading recorded information from information storage medium with tracks
Assignee: Pioneer Corp
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Filing: 1990-06-12
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Granted: —
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Expires: 2010-06-12
Abstract
Abstract The same track on an optical disk (1) is read at least twice by an optical pickup (3) at a speed rich is at least twice a standard speed to store the read information into a memory (7) at a time of the first reading corresponding to a memory periodic interval (Mn). When an erroneous track jump has occurred, the optical pickup (3) is returned to the track on which the erroneous track jump has occurred and the read information from the track is stored into the memory (7) during and empty interval (En).
Inventors
- 👤 Eiji C/O Pioneer Electronic Corp. Muramatsu
- 👤 Takanori C/O Pioneer Electronic Corp. Maeda
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-03 19:19
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/004; G11B7/005; G11B27/00; G11B27/36; G11B7/08; G11B7/09; G11B7/0946; G11B2220/00; G11B2220/20; G11B2220/25; G11B2220/2537; G11B2220/2545; G11B2220/2587
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
160 words
A method of reading recorded information from an information storage medium (1) in which the information is recorded in spiral tracks on a time-series basis at a standard speed, characterized in that said method comprising the steps of: reading each of the tracks at least twice at respective reading periodic intervals while the information storage medium (1) is rotated at a speed which is at least twice the standard speed, and storing the read information into a memory (7) at a former one of said reading periodic intervals, repeatedly at periodic intervals of the standard speed; reading again any track, from which a track jump has occurred, at a reading periodic interval next to the reading periodic interval in which the track jump has occurred, and storing the read information into said memory (7); and reading the stored information from said memory (7) continuously on a time-series basis at said standard speed to output information signals to a reproduction device.
Claim 2
Independent Claim
160 words
A method of reading recorded information from an information storage medium (1) in which the information is recorded in spiral tracks on a time-series basis at a standard speed, characterized in that said method comprising the steps of: reading each of the tracks at least twice at respective reading periodic intervals while the information storage medium (1) is rotated at a speed which is at least twice the standard speed, and storing the read information into a memory (7) at a former one of said reading periodic intervals, repeatedly at periodic intervals of the standard speed; reading again any track, from which a track jump has occurred, at a reading periodic interval next to the reading periodic interval in which the track jump has occurred, and storing the read information into said memory (7); and reading the stored information from said memory (7) continuously on a time-series basis at said standard speed to output information signals to a reproduction device.
Claim 3
Dependent Claim
56 words
A method according to claim 1, wherein said information storage medium (1) has a jump command position (J) for generating a jump command to jump an information reading means (3) and a memory position (M) for storing read information into said memory (7), said memory position (M) being angularly spaced from said jump command position (J).
Claim 4
Dependent Claim
94 words
A method according to claim 1, wherein when each of the tracks is read at least twice, a pulse is generated in synchronism with the arrival of a light beam spot for reading the recorded information from the tracks at a jump command position (J) on the information storage medium (3) for generating a jump command to jump the light beam spot, and the generated pulse is sent to a jump command unit (5) to return the light beam spot to the preceding track after having passed through the jump command position (J) twice.
Claim 5
Dependent Claim
79 words
A method according to claim 1, wherein when the track jump occurs from a track to be scanned by a light beam spot of the information reading means (3) to another track, a track search command is issued to return the information reading means to said track to be scanned in response to the first arrival of the light beam spot which is scanning said another track at a jump command position (J) on the information storage medium (1).
Claim 6
Dependent Claim
28 words
A method according to claim 1, wherein each of said reading periodic intervals (Tn) is composed of a memory periodic interval (Mn) and an empty periodic interval (En).
References Cited (Backward Citations)
No citation records indexed.
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