JPH10149633A - Digital data recording system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reproduce the accurate digital data even when a recording medium is reproduced by a reproducing device having no function for reading fault information by recording the digital data to be recorded on the fault area and the area to be data written next when a recording medium area specified to be recorded is the fault area is discriminated. SOLUTION: When the identification data ID are recorded successively in order of a sector such as (m), (m+1), (m+2)..., when the area that the identification data ID record the sector of (m+5) is a fault sector is judged, the data are recorded on the fault sector. Thereafter, the same identification data ID record again the digital data of the sector of (m+5) on the normal sector next of the fault sector. Even when the fault sector of the regenerative data becomes OK accidentally to be recorded in a memory in the reproducing device, since the next normal sector is produced/recorded, the correct digital data are superscribed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital data recording system for recording digital data on a recording medium such as an optical disk, and more particularly to a measure against a data recording failure area in the recording medium. About what you did.

[0002]

2. Description of the Related Art As is well known, in recent years, not only audio data but also moving image data can be compressed and recorded on an optical disk having a diameter of 12 cm, for example, the same as an audio CD (Compact Disk). ing.

As this type of optical disk, for example, a data read-only CD-ROM (Read Only Memory)
And CD-E (Erasable), etc., which can rewrite data, are available. From information use to karaoke use,
It has become widespread in a wide range of fields.

At present, moving image data corresponding to a movie for about two hours and audio data in eight different languages are recorded at high density by compression encoding on an optical disk having the same diameter as a CD. In addition, an optical disc, commonly called a DVD, has been developed that can record sub-picture data representing subtitles and the like in 32 different languages.

[0005] In the case of this DVD, as in the case of a CD, a DVD-ROM or DVD-RAM (random access memory) is used.
s Memory) has been actively developed.

In such various types of optical discs, the moving picture data strings and the sound data strings that have been compression-encoded are each recorded in a physical unit called a sector. In this case, a sector of moving image data and a sector of audio data are provided on the optical disc.
Each is recorded as a data stream arranged in a time division manner.

FIG. 4 shows the structure of one sector. That is, one sector is composed of 26 frames. In FIG. 4, these frames are sequentially recorded or reproduced in the order of left frame, right frame, left frame, right frame,... From top to bottom.

[0010] Each frame in one sector is composed of a frame 0, a frame 1,...
Numbers are assigned, such as frame 25. Also,
Each frame has a synchronization code SYNC, an identifier ID (Identification Data) indicating a sector, and a parity P.
, A reserve Rsv, and compression-encoded moving image data or audio data.

Here, the above-described CD-E and DVD-RA
In a recording / reproducing apparatus for recording / reproducing digital data on an optical disk capable of rewriting data such as M, first, a digital data string such as moving image data and audio data is divided into sectors and recorded. In this case, whether there is any defect in the recording area on the optical disk where one sector of digital data is to be written, that is, whether one sector of data can be recorded in a desired recording area on the optical disk. It is necessary to judge.

[0010] In this case, the optical disk is inspected for defects in its recording area at the time of manufacture at a factory. When the optical disk is shipped from the factory, a defective sector table indicating the position of the defective part detected by this inspection is recorded. For this reason, the recording / reproducing apparatus determines the defective area by referring to the defective sector table recorded on the optical disk, and does not record data in the defective area.

That is, in the normal state, the recording / reproducing apparatus has, for example, an identifier ID (m), as shown in FIG.
Digital data is sequentially recorded in the recording area of the optical disk in the order of sectors (m + 1), (m + 2),. Then, for example, when the area in which the sector with the identifier ID (m + 5) is to be recorded is indicated by the defective sector table as a defective sector, the recording / reproducing apparatus
The control is performed such that the defective sector is skipped (slid), and the sector having the identifier ID (m + 5) is recorded in the next area.

In this type of data rewritable optical disk, a normal recording area may become a defective sector while recording and reproducing digital data are repeated. Therefore, in the recording / reproducing apparatus, before recording digital data, a reference signal is recorded / reproduced on / from the optical disk, and a new defective sector is detected based on the reproduction result. in this case,
The recording / reproducing apparatus determines the position of the newly detected defective sector,
It is added to the defective sector table.

In order to read and reproduce digital data from the optical disk as described above, the recording / reproducing apparatus converts the digital data recorded on the optical disk into identifiers (m), (m) as shown in FIG. m + 1),
(M + 2),... Are sequentially read and reproduced in the order of sectors. In this case, the recording / reproducing device operates to skip the defective sector specified by the defective sector table and reproduce the data recorded on the optical disk.

By the way, the recording / reproducing apparatus as described above has
It is possible to search for a defective sector at the time of recording and reproduction, and to slip, because it is integrated as a system that records and reproduces digital data on recording media such as CD-E and DVD-RAM. It is something that has become.

However, for example, a CD-ROM or DV
Considering that a reproducing apparatus for a reproduction-only recording medium such as a D-ROM is intended to reproduce a CD-E or a DVD-RAM, this type of reproducing apparatus includes a CD-E or a DVD-RAM.
Since a function of reproducing a defective sector table recorded in a RAM or the like and searching for a position of a defective sector is not originally added, this reproducing apparatus uses a CD-E or DVD-R.
When AM or the like is reproduced, defective sectors are also reproduced without slipping.

Here, this type of reproducing apparatus has a built-in semiconductor memory, and is configured so that digital data read from an optical disk is written into the semiconductor memory in sector units and then reproduced. In this case, the sector-based digital data is written to the semiconductor memory at an address position generated based on the identifier ID added to the sector.

For this reason, there is no problem if the digital data read from the defective sector is definitely determined to be in error and invalidated, but the data contains a sector identifier ID.
Exists, and its identifier I
If the parity check on D happens to be OK,
The reproducing device operates to record the digital data read from the defective sector in the semiconductor memory with the address generated based on the identifier ID and to perform the reproducing process.

However, sector data recorded in a normal recording area having the same identifier ID as the identifier ID read from the defective sector has already been read, and the sector data is an address generated based on the identifier ID. In the case where the data is recorded in the semiconductor memory, there is a problem that the digital data read from the defective sector overwrites the correct digital data recorded in the semiconductor memory.

For example, in FIG. 5, when the reproducing apparatus reads data of a defective sector, an identifier ID of (m + 4) is obtained by accident from the data, and a parity check for the identifier ID of (m + 4) is performed. Suppose OK. Then, the reproducing apparatus operates to write the digital data read from the defective sector into the semiconductor memory with the address generated based on the identifier ID (m + 4) as described above.

However, in this case, the digital data has already been reproduced from the sector with the identifier ID (m + 4) recorded in the normal recording area of the optical disk, and the digital data of the sector is replaced with the identifier ID (m + 4). If the address generated based on this is recorded in the semiconductor memory, the digital data read from the defective sector is overwritten on the area where the correct digital data is recorded on the semiconductor memory, and the regular sector data is written. Will be lost.

[0021]

As described above, CD-
When a reproducing apparatus for reproducing a read-only recording medium such as a ROM or a DVD-ROM reproduces a recordable / reproducible recording medium such as a CD-E or a DVD-RAM, the data is recorded in a defective area of the recordable / reproducible recording medium. Data is also read, so that the data has an adverse effect on the data read from the normal area, and there is a problem that accurate digital data cannot be reproduced.

Therefore, the present invention has been made in view of the above circumstances, and even when reproducing a recording medium that can be recorded and reproduced by a reproducing apparatus that reproduces a read-only recording medium, accurate digital data can be reproduced. It is an object of the present invention to provide a very good digital data recording system capable of recording data in a computer.

[0023]

According to the present invention, there is provided a digital data recording system which divides digital data into sector units on a recording medium on which defect information indicating a defect area is recorded in sector units. It is targeted. Then, in a state in which the area of the recording medium designated for recording digital data based on the defect information is determined to be a defective area, the digital data to be recorded in the defective area is stored in the defective area and the next. The data is recorded in the area where the data is written.

According to the above configuration, the digital data to be recorded in the defect area is recorded in the defect area and the area where the data is to be written next. When the recording medium is reproduced by a reproducing apparatus without the defect, after the digital data read from the defective area is converted into the semiconductor memory, the digital data read from the area where the data writing is performed next to the defective area is written to the same address of the semiconductor memory. Therefore, the digital data read from the defective area is overwritten by the data written later, so that accurate digital data can be reproduced.

[0025]

Embodiments of the present invention will be described below in detail with reference to the drawings. That is, as shown in FIG.
When D is sequentially recorded in the order of (m), (m + 1), (m + 2),..., The identifier ID is (m +
If it is determined that the area for recording the sector 5) is a defective sector, an operation of recording the digital data of the sector with the identifier ID (m + 5) to the defective sector is performed. The digital data of the sector with the same identifier ID (m + 5) is recorded again in the normal sector.

That is, when digital data is recorded on the optical disk, an area designated as a defective sector by referring to the defective sector table is provided with a sector [in this case, the identifier ID is ( m + 5)
Write operation, and then the same sector [identifier I] is added to the normal sector following the defective sector.
D writes (m + 5) sectors] data. In this case, even if a digital data write operation is performed on a defective sector, naturally, there is no compensation that the digital data is correctly written.

It is assumed that an optical disc on which digital data has been recorded by the above-described recording operation is reproduced by a reproducing apparatus for reproducing a read-only optical disk. In this case, the defective sector is reproduced, and from the reproduced data,
The sector ID (m + 5) is read, and
If the parity check for the identifier ID (m + 5) happens to be OK, the reproducing apparatus converts the digital data read from the defective sector to the identifier ID (m + 5).
Is recorded in the semiconductor memory with the address generated based on the.

Thereafter, the reproducing apparatus reproduces a normal sector next to the defective sector, and reads a sector ID (m + 5) from the reproduced data. And the playback device,
When it is confirmed that the parity check is OK for the identifier ID (m + 5) of the read sector, the digital data read from the normal sector next to the defective sector is determined based on the identifier ID (m + 5). The generated address is recorded in the semiconductor memory.

That is, in the area where the digital data read from the defective sector is recorded on the semiconductor memory,
The correct digital data read from the normal sector next to the defective sector will be overwritten, so that the loss of the normal digital data can be prevented.

Further, the same digital data is recorded in the defective sector and the next normal sector, and the data obtained from both sectors is written in the same area of the memory during reproduction. If, for example, missing data is lost in units of frames, there is a possibility that the missing data can be interpolated with data obtained from a defective sector already recorded in the memory, and expect to reduce errors. Can be.

FIG. 2 shows a configuration of a recording system for realizing the above-described recording operation. That is, a defective sector table is read from the optical disk 11 on which digital data is to be recorded, a defective sector position is detected from the defective sector table by the defective sector detection circuit 12, and the detection result is stored in the memory 14 via the memory control circuit 13. doing.

The data to be recorded on the optical disk 11 is taken into the memory 14 via the data input circuit 15 and syndrome calculation is performed by an ECC (Error Correcting Code) adding circuit 16 to add an error correcting code. You. The data to which the error correction code is added is modulated from 8 bits to 16 bits by an 8/16 modulation circuit 17, and then the fixed pattern data output from a fixed pattern generation circuit 19 is selected by a selector circuit 18. Will be added.

Thereafter, the data output from the selector circuit 18 is transmitted to the optical disk 11 by the data writing circuit 20.
Is converted into digital data to be recorded on the optical disk 11 and written on the optical disk 11.

Here, as shown in FIG.
If the recording area on the optical disk 11 on which the data of the sector with (m + 5) is to be recorded is indicated by the defective sector table recorded in the memory 14 as a defective sector, this recording system has the identifier ID (( An operation of recording the data of the (m + 5) sector into the defective sector is executed, and after the recording operation is completed, the operation of recording the data of the sector with the identifier ID (m + 5) in the next normal sector is performed again.

FIG. 3 shows the configuration of the reproducing system. That is, the data read from the optical disc 11 is converted into digital data by the data reading circuit 21, synchronized by the synchronization circuit 22, and synchronized by the 8/16 demodulation circuit 23.
The data is demodulated from bits to 8-bit data and written to the memory 24.

In this case, the digital data output from the 8/16 demodulation circuit 23 is subjected to parity check of the identifier ID by the ID detection parity check circuit 25,
If OK, the address is generated by the address control circuit 26 based on the identifier ID. And 8/1
The digital data output from the 6 demodulation circuit 23 is written into the memory 24 based on the address output from the address control circuit 26.

Thereafter, the digital data read from the memory 24 is subjected to error correction processing by the ECC circuit 27 based on the error correction code, and is taken out via the data output circuit 28. That is, even if the reproducing system does not have a function of reading the defective sector table recorded on the optical disc 11, the data of the defective sector is overwritten with the correct data on the memory 24 as described above, so that accurate digital data is Will be played.

Here, in the above-described embodiment, data having the same content as the slip destination sector is recorded in the defective sector. However, other data may be recorded in the defective sector. It is. For example, by recording data (for example, data of a constant period of a continuous 4T pattern) that can be definitely recognized as an error in a defective sector, when a defective sector is reproduced by a reproducing system,
The data can be judged invalid and invalidated.

Further, in this case, the error data obtained by reproducing the defective sector in the reproducing system is written to the memory, so that the data previously written to the memory is overwritten by the error data and erased. Therefore, there is also an effect that the previous data is not erroneously used. It should be noted that the present invention is not limited to the above-described embodiment, and can be variously modified and implemented without departing from the scope of the invention.

[0040]

As described in detail above, according to the present invention,
To provide an extremely excellent digital data recording system capable of recording data so that accurate digital data is reproduced even when a recording medium that can be recorded and reproduced is reproduced by a reproducing apparatus that reproduces a read-only recording medium. Can be.

[Brief description of the drawings]

FIG. 1 is a view for explaining an embodiment of the present invention;

FIG. 2 is a block diagram showing a configuration of a recording system according to the embodiment;

FIG. 3 is a block diagram showing a configuration of a reproduction system according to the embodiment;

FIG. 4 is a view for explaining the structure of one sector.

FIG. 5 is a diagram illustrating a recording / reproducing operation for a recording medium capable of recording / reproducing.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 ... Optical disk, 12 ... Defective sector detection circuit, 13 ... Memory control circuit, 14 ... Memory, 15 ... Data input circuit, 16 ... ECC addition circuit, 17 ... 8/16 modulation circuit, 18 ... Selector circuit, 19 ... Fixed pattern Generating circuit, 20: Data writing circuit, 21: Data reading circuit, 22: Synchronizing circuit, 23: 8/16 demodulation circuit, 24: Memory, 25: ID detection parity check circuit, 26: Address control circuit, 27: ECC circuit , 28 ... data output circuit.

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification code FI G11B 20/18 572 G11B 20/18 572F

Claims (4)

[Claims] 1. A digital data recording system that divides digital data into sector units on a recording medium on which defect information indicating a defect area in sector units is recorded, and records the digital data based on the defect information. In a state where the area of the recording medium designated for recording is determined to be a defective area, the digital data to be recorded in the defective area is transferred to the defective area and the area where data is to be written next. A digital data recording system characterized by recording each. 2. A digital data recording system which divides digital data into sector units and records the same on a recording medium on which defect information indicating a defective area is recorded in sector units, wherein the digital data is recorded based on the defect information. In a state where the area of the recording medium designated for recording is determined to be a defective area, digital data to be recorded in the defective area is recorded in an area where data writing is performed next to the defective area. And a digital data recording system for recording invalid data upon reproduction in the defective area. 3. The digital data recording system according to claim 2, wherein the data that becomes invalid during reproduction is data having a fixed period. 4. The digital data storage device according to claim 1, wherein the area in which data is written next to the defective area is an area in which data is reproduced next to the defective area. Recording system.