Dynamic information storage or retrieval – Storage medium structure – Optical track structure
Patent
1991-04-22
1996-12-24
Psitos, Aristotelis
Dynamic information storage or retrieval
Storage medium structure
Optical track structure
3692754, G11B 700
Patent
active
055879012
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to an optical recording medium on a pre-formed recording track of which the reproduce-only information other than the main information recorded along the track direction is recorded by offsetting the track along its width, a method for recording the information on the optical recording medium, and a method for reproducing the information from the optical recording medium.
BACKGROUND ART
In an optical recording medium on which the information can be recorded, such as a magneto-optical disc, it has been known to provide a helical groove or concentric grooves for tracking in advance on the disc, with the inside of the pre-formed groove or pre-groove or the land between the adjoining pre-grooves being used as a recording track, and to record and/or reproduce the information photomagnetically on or from the recording track along the track direction. That is, the pre-groove is detected optically and the main information is recorded and/or reproduced along the direction of the recording track under application of tracking servo.
In this case, it has been known to record alternately the control information, such as sync signals or addresses, referred to sometimes in this specification as reproduce-only information, and the recording data information per se, on the recording track along the track direction, and to execute data supervision on the basis of the sync signals, addresses etc. of the control information. That is, synchronization of a frame or segment as a unit of data recording is taken by the sync signals, and data are recorded and/or reproduced on the frame-by-frame or sector-by-sector basis with the aid of the address information. As the format for these sync signals and addresses, a so-called CD (compact disc) format, for example, is used in view of interchangeability.
The conventional CD format is explained briefly by referring to FIG. 7.
In this figure, each block or sector as an information recording unit consists of 98 frames of from 0th to 97th frames. The period of each frame is 588T, that is, 588 times the channel clock period T. Each frame is provided with recording regions for frame sync signals, subcode and data inclusive of parity data. A 24T (24 channel bit) frame sync signals region and a 14T subcode region are provided at the leading end of each frame and interconnected by 3T connection bits. In the remaining 544T region, there are arrayed 32 symbols or 32 bytes of sampled data and parity data modulated by the so-called eight-to-fourteen modulation (EFM) system. The frame sync signals include two successive 11T transition intervals to provide an out-of-rule pattern not found in EFM. The 14T subcode region corresponds to one 8-bit symbol.
If an uninitialized optical disc, that is an optical disc on which no data are written, is used, the disc needs to be formatted, that is, sync signals or address information necessary for recording and/or reproduction on or from the optical disc, need to be written along the track direction in the form of, for example, photomagnetic signals.
In the Japanese Patent KOKAI Publication No. 63-87682 (1988), there is disclosed a technique in which the timing code as the address information is included in wobbling signal components of a groove previously formed with wobbling along the track width for tracking (pregroove). For the wobbling signal, a signal which is obtained by frequency modulation of the sinusoidal carrier signal with a frequency of 22.05 kHz, with an absolute time code having a frequency sufficiently lower than that of the carrier signal, is employed. During groove formation on the disc, the groove is wobbled along the track width by the frequency modulated signal for forming the pre-groove in which the absolute time information is included in the wobbling signal. This is abbreviated to ATIP (absolute time in pregroove). During recording/reproduction of the recording data or main data, tracking error signals are obtained from the signals reproduced from the pregroove, while the absolute time codes are
REFERENCES:
patent: 4375088 (1983-02-01), de Haan et al.
patent: 4464714 (1984-08-01), Huijser et al.
patent: 4907216 (1990-03-01), Rijnsburger
patent: 5077721 (1991-12-01), Sako et al.
"Principles of Optical Disc System", Adam Hilgar Ltd. Bristol and Boston, pp. 210-227.
Sako Yoichiro
Yamagami Tamotsu
Yamamoto Masanobu
Psitos Aristotelis
Shaw, Jr. Philip M.
Sony Corporation
Tran Thang V.
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