Dynamic information storage or retrieval – Condition indicating – monitoring – or testing – Including radiation storage or retrieval
Reexamination Certificate
1997-04-21
2001-05-01
Young, W. R. (Department: 2753)
Dynamic information storage or retrieval
Condition indicating, monitoring, or testing
Including radiation storage or retrieval
C369S059160
Reexamination Certificate
active
06226247
ABSTRACT:
TECHNICAL FIELD
The invention relates to a data recording apparatus and method and a data reproducing apparatus which are applied when read data of, for example, a CD-ROM is recorded to another data recording medium and when data is reproduced from a data recording medium.
BACKGROUND ART
As an external storage device of a computer, an optical disc drive has several advantages such as large capacity and high speed access. The use of a CD-ROM [or CD-I (CD-Interactive)] drive and an MO (magnetooptic disc as one of erasable discs) is rapidly spreading. As a device other than those drives, an MD (minidisc; erasable disc) having a disc diameter of 2.5 inches has also been proposed. Further, a DVD (Digital Video Disc) is also being developed as a video storage medium.
The DVD is a recordable/reproducible optical disc like a read only disc, MO disc, or phase change type disc having the same diameter as that of a CD and is a disc in which video information compressed by an MPEG or the like can be reproduced or recorded/reproduced. In a DVD, the recording density is improved by improvements in digital modulation and an error correction coding together with the advancement of a short wavelength of a laser beam and the increase in NA of an objective lens. Even in the case of a single-layer disc, a data storage capacity is extremely large to be about 3.7 Gbytes. In a manner similar to that the CD and MD have initially been developed as digital audio discs and are also subsequently used as an external storage medium of a computer, it is also expected that the DVD of a larger capacity is used as an external storage medium of a computer.
It is considered that data read out from the CD-ROM and data from a hard disc drive are recorded by using a storage medium of a large capacity such as a DVD or the like. Hitherto, in case of the external storage medium of the computer, since a sector size (512 bytes, 2 kbytes, etc.) of 128 bytes×2
i
is a main stream, the data of the CD-ROM is also ordinarily recorded by such a sector size.
Upon recording/reproduction of data, a reliability (magnitude of an error rate) of the data is peculiar to the recording medium and the operation to select processes upon recording in consideration of it is not performed. In case of data in which a high reliability is required, however, it is necessary to further perform a protection by an error correction code upon recording. Thus, a redundancy of data increases and a recording capacity substantially decreases. Even when a significance of data is high, it is also necessary to strongly take a countermeasure for errors. Further, as in case of the CD-ROM, since there is a possibility such that data to be recorded has a plurality of formats (called modes), it is desirable to take a countermeasure for the errors in consideration of the formats.
It is, therefore, an object of the invention to provide a data recording apparatus and method and a data reproducing apparatus which can change a recording process in accordance with a reliability of data or the like.
DISCLOSURE OF INVENTION
To accomplish the above object, according to the invention, there is provided a data recording apparatus for recording digital data to a data recording medium, comprising:
input means for receiving data to which a first error correction code was added and instruction information;
sector segmenting means for selectively executing an error correction using the first error correction code to the inputted data and converting the data into data comprising sectors each having a predetermined size;
coding means for adding a second error correction code to perform an error correction to the sector segmented data to the data outputted from the sector segmenting means;
modulating means for performing a predetermined digital modulation to the data to which the second error correction code was added;
recording means for recording the modulated data to the data recording medium; and
means to which the instruction information is inputted and which controls the sector segmenting means so as to selectively add the first error correction code to the data from the input means on the basis of the instruction information.
According to the invention, there is also provided a data recording apparatus for recording digital data to a data recording medium, comprising:
input means for receiving data and instruction information from an outside;
sector segmenting means for selectively adding a first error correction code to perform an error correction to the inputted data to the data and converting into data constructed by one of a plurality of kinds of sectors of different sizes;
coding means for adding a second error correction code to perform an error correction to the sector segmented data to the data outputted from the sector segmenting means;
modulating means for performing a predetermined digital modulation to the data to which the second error correction code was added;
recording means for recording the modulated data to the data recording medium; and
means to which the instruction information is inputted and which controls the sector segmenting means so as to selectively add the first error correction code to the data from the input means on the basis of the instruction information.
Further, according to the invention, there is provided a data reproducing apparatus for reproducing data from a data recording medium on which predetermined data has been converted into data of a plurality of kinds of sector structures and recorded on the basis of instruction information, comprising:
means for reproducing the data from the data recording medium;
demodulating means for performing a digital demodulation to the reproduced data;
correcting means for performing an error correction by using a first error correction code included in the data to the demodulated data;
means for desegmenting the data from the correcting means every sector and outputting;
means for detecting identification information corresponding to the instruction information from the data reproduced by the reproducing means; and
means for controlling the output means so as to desegment one of the data having the plurality of kinds of sector structures into data having a predetermined size on the basis of the detected identification information.
According to the invention, there is further provided a data recording method of recording digital data onto a data recording medium, comprising the steps of:
receiving data and instruction information from an outside;
selectively adding a first error correction code to perform an error correction to the received data to the data and converting into data constructed by one of a plurality of kinds of sectors of different sizes;
adding a second error correction code to perform an error correction to the sector segmented data to the sector segmented data;
performing a predetermined digital modulation to the data to which the second error correction code was added;
recording the modulated data onto the data recording medium; and
receiving the instruction information and selectively adding the first error correction code to the data from input means on the basis of the instruction information.
According to the foregoing invention, there are selected: processes such that CD-ROM data which was coded by an error correction code of, for example, a CD-ROM is received, the error correction code is decoded and sector segmented into 2-kbyte sectors by instruction information in consideration of a reliability, a significance, a recording capacity, or a mode which is required, and the segmented sectors are recorded; and processes such that a format of the CD-ROM data is stored and sector segmented. The data recorded as mentioned above is reproduced from a recording medium and is subjected to a sector desegmenting process corresponding to the process upon recording and is outputted as CD-ROM data.
In accordance with instruction information, there are selected: processes such that data of a 2-kbyte sector constructed by user data of bytes which are integer times as large
Sako Yoichiro
Toyama Katsumi
Limbach & Limbach L.L.P.
Sony Corporation
Young W. R.
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