Dynamic information storage or retrieval – Condition indicating – monitoring – or testing – Including radiation storage or retrieval
Patent
1997-08-20
1999-09-21
Hindi, Nabil
Dynamic information storage or retrieval
Condition indicating, monitoring, or testing
Including radiation storage or retrieval
369124, G11B 700
Patent
active
059563079
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a reproducing device and reproducing method for a disk such as a CD-ROM in which coded data are recorded, and particularly to a device and method of reproducing an optical disk in which data are recorded in the constant linear velocity system.
BACKGROUND ART
Recently, as an example of a device for reproducing data recorded on an optical disk, there are a compact disk player (hereinafter, referred to as CD player), a CD-ROM drive device in which a compact disk (hereinafter, referred to as CD) is used a read-only memory, etc. As a CD-ROM drive device becomes popular, the request for providing a CD-ROM drive device with a reproducing function which enables fast access while attaining low-power consumption is growing.
Recording systems for a disk include the constant linear velocity system (hereinafter, referred to as CLV system) which is characterized in high-density recording, and the constant angular velocity system (hereinafter, referred to as CAV system) which is characterized in high-speed search. For example, Japanese Patent Unexamined Publication (Tokkai) No. Hei6-36289 discloses a method in which a disk wherein recording was performed by the CLV system is reproduced under CAV-rotation. Japanese Patent Unexamined Publication (Tokkai) No. Sho62-88170 discloses a method in which a disk wherein recording was performed by the CLV system is reproduced at a linear velocity higher than a specified linear velocity. In the former method, influences of the rotation settlement of a spindle servo can be eliminated, and the pickup-moving time is substantially equal to the access time. The latter is a system in which reproduction can be started even in a period when the CLV rotation settlement has not yet reached the final linear velocity. As the rotation number of a spindle motor is increased to a double speed or a quadruple speed, the effects of these systems are further recognized. For example, results of a technical study on the variable linear velocity reproduction system are reported in NIKKEI ELECTRONICS No. 628 (Feb. 13, 1995), pp. 111 to 119. In the report of NIKKEI ELECTRONICS, the term of variable velocity reproduction is used. In the following description, however, reproduction under the state where the linear velocity has not yet reached the final target is called the variable linear velocity reproduction system.
In a usual CD player or a CD-ROM device, the read clock signal is fixed, and the rotation of a disk is synchronized in phase with the read clock signal. Such a player or device is configured so that data which were once stored in a memory or the like by using the write clock signal synchronized with the regenerative clock signal are read out in synchronization with the read clock signal, thereby absorbing the time fluctuation.
By contrast, in a CD-ROM drive device, it is not particularly necessary to read out data by using a fixed clock signal. Therefore, such a device may be configured so as to read out data in accordance with rotation of a disk. The above-mentioned variable linear velocity reproduction system is a reproduction system which was developed in view of the above.
Prior Art Example 1
Hereinafter, a conventional CD-ROM drive device using the CLV system, and the variable linear velocity reproduction system exemplified by Japanese Patent Unexamined Publication (Tokkai) No. Hei3-36289 will be described.
FIG. 57 is a block diagram showing the configuration of a conventional CD-ROM drive device using the CLV system. The device comprises: a CD-ROM disk (hereinafter, referred to as CD) 1 wherein recording was performed by the CLV system; an optical pickup 5; a binarizing circuit 8 which converts a reproduced signal into a digital signal; an EFM (Eight to Fourteen Modulation code) demodulation circuit 10; a serial-parallel converting circuit 30; a write clock signal generating circuit 31; a PLL (Phase Locked Loop) circuit 9 which extracts a clock signal from a binary signal; a synchronization detecting circuit 11 which extracts a synch
REFERENCES:
patent: 5761163 (1998-09-01), Nakane et al.
patent: 5774435 (1998-08-01), Hirano
Imura Masaharu
Ishibashi Hidefumi
Koudo Toshikazu
Kuno Yoshiki
Mashiko Yasuhisa
Hindi Nabil
Matsushita Electric - Industrial Co., Ltd.
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