Dynamic information storage or retrieval – Binary pulse train information signal – Including sampling or a/d converting
Reexamination Certificate
2000-10-10
2004-03-09
Hindi, Nabil (Department: 2655)
Dynamic information storage or retrieval
Binary pulse train information signal
Including sampling or a/d converting
Reexamination Certificate
active
06704263
ABSTRACT:
The invention relates to a method of preventing recording on a disc like recording medium of the optically rewritable type, the method comprising applying a pre-groove on the disc like recording medium adapted to write data therein in accordance with a first write strategy, reserving a program calibration area (PCA) for optimum power control (OPC) and/or a program memory area (PMA) for temporarily storing a table of content (TOC) on said disc like recording medium.
The invention further relates to a recording apparatus adapted for recording digital information signals on a disc like recording medium of the optically rewritable type, said apparatus comprising input means for receiving digital information signals, encoding means for coding the received digital information signals for recording on the disc like recording medium, writing means for writing optically detectable marks representing the encoded information signals on the disc like recording medium in accordance with a first write strategy, address determining means for locating on the disc like recording medium a program calibration area (PCA) to be used for a optimum power control (OPC) procedure and/or a program memory area (PMA) to be used for temporarily storing a table of content (TOC).
The invention also relates to a disc like recording medium of the optically rewritable type.
A disc like recording medium of the optically type is disclosed for instance in European Patent 390 268 (PHN13148), which is incorporated by reference herein. Such a disc which allows recording apart from playback may be referred to as a CD-Recordable (CD-R), a CD-Erasable (CD-E) or a CD-Rewritable (CD-RW).
As the name implies, CD-RW is a media and recording system that allows the user to erase previously recorded information and then to record new information in its place, making short-term storage feasible on CD media. This is accomplished by means of a new CD-RW media using “phase change” technology that allows a recording laser beam to change the media material from amorphic to crystalline by means of a shift in power.
The first generation of CD-RW discs are designed for speed applications covering a range of 1 times-4 times the nominal speed of a conventional CD-ROM disc, being approximately 150 kbs. The next generation CD-RW discs however will designed for high speed applications ranging from 4 times-10 times this nominal speed. Because of the typical behavior of phase change materials, these discs need a new write strategy, which is not suited for recording at lower speeds. Furthermore, the existing write strategies defined for 1×, 2× and 4×recording speed, do not work on these new discs.
Some of the existing CD-RW recorders, designated to operate with the lower speed ranges, are recognizing the new high speed discs and reject them. But others will accept these discs and make recordings on them according to one of the existing write strategies, for instance default at 2×speed. These recordings will result in unreadable signals, thereby destroying previously recorded information.
In consequence, amongst other things, it is an object of the invention to obviate the above-mentioned disadvantages. According to one of its aspects a method according to the invention is characterized by making one or both of said areas untraceable for recording devices adapted to write data on a disc like recording medium in accordance with a second, different write strategy.
As both areas are needed by a recorder, hiding these areas for existing recorders, designed to operate with low speeds, will result in rejecting of the disc.
With a method comprising applying absolute time reference (ATIP) information in the pre-groove on the disc like recording medium, start locations of said areas are being determined by a fixed time offset relative to a subsequent Lead-in area, an advantageous embodiment thereof is characterized by introducing an ATIP time code jump to ATIP time codes before the start of the Lead-in area. The Pre Groove of a CD-RW disc contains an Absolute Time Reference in the Pre Groove. As the locations of the PCA and PMA areas are determined by a fixed offset relative to the Start time of the Lead-in areas, these areas are made untraceable.
Further advantageous embodiments of a method according to the invention are disclosed in the description, as well as embodiments of a disc like recording medium and recording apparatus according to the invention.
REFERENCES:
patent: 5226027 (1993-07-01), Bakx
patent: 5305296 (1994-04-01), Kono
patent: 6411574 (2002-06-01), Su et al.
Heemskerk Jacobus P. J.
Nijboer Jakob G.
Hindi Nabil
Koninklijke Philips Electronics , N.V.
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