JPH097305A - Data recording/reproducing apparatus and method and data recording medium - Google Patents

Abstract

PURPOSE: To enable or facilitate transferring of any of a data for computer storage and a data for a CD-ROM onto the same data recording medium. CONSTITUTION: A 2K byte data for computer storage or a data for a CD-ROM are converted to a sector configuration of a different sector size by formatting circuits 4a and 4b. Then, the results are converted to a data of the same block size by a blocking circuit 6. The data blocked are supplied to sync addition circuits 10a and 10b through an encoder 8 for an error correction code and a digital modulation circuit 9. Outputs of the circuits are supplied to an optical pickup 12 to be recorded into an optical disc 2. The identification of the sector configuration is made possible by headers to be added in the formatting circuits 4a and 4b and a bit pattern of a sync added.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data recording medium having different formats, and more particularly to a data recording / reproducing apparatus and method capable of simplifying signal processing between data recording media having different sector sizes, and a data recording medium. .

[0002]

2. Description of the Related Art As an external storage device of a computer, an optical disk drive has been attracting attention because of its advantages of large capacity and high speed access, and it has already been a CD-ROM (or CD-I
(nteractive)) drive and MO (magneto-optical disc), which is one of the erasable discs, are being adopted rapidly. In addition to these, an MD (mini disk; erasable disk) having a disk diameter of 2.5 inches is also proposed. Furthermore, a DVD (digital video disc) is being developed as a video storage medium.

A DVD is a recordable / reproducible optical disc that is a read-only disc having the same diameter as a CD, or an MO disc or a phase change type disc.
It is a disc that can reproduce or record / reproduce video information compressed by G or the like. In DVD, the recording density is further improved by the progress of the shortening of the wavelength of laser light, the increase of NA of the objective lens, and the improvement of the processing of digital modulation and error correction coding. Even in the case of a single layer disc,
The data storage capacity is enormous, about 3.7 GB. CDs and MDs were originally developed as digital audio discs, and then used as external storage media for computers.
Is also expected to be used as an external storage medium of a computer.

Conventionally, different formats have been defined for each medium such as a magnetic tape, a magnetic disk, a flexible disk and the above-mentioned optical disk, and it cannot be said that compatibility is taken into consideration. Therefore, when the compatibility between the new medium and the existing medium is taken, it is not efficient because it can be dealt with only in the logical area. For example, in the case of an external storage medium of a computer, a sector size of 128 bytes × 2 ⁱ (512 bytes, 2,048 bytes (2 Kbytes), etc.) is the mainstream, while a CD-ROM has 2,352 bytes ( If the sync signal is excluded, a few
40 bytes, excluding sync signal and header,
(2,336 bytes) is one block, and there is a problem that it is difficult for both to physically support each other.

[0005]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
It can be realized by a read-only disc similar to D, a recordable MO disc, or a phase change type disc, and its capacity is greater than that of any existing optical disc.
It has the advantage of being quite large. When such a DVD is newly used as an external storage medium, an existing optical disc medium, in particular, a CD-ROM which has been widely spread and has substantially the same disc size and adopts the same reading method, Considering the compatibility of CD-R
Mutual loading of data between OM and DVD is made easy, and the drive can be shared.
-It is indispensable for utilizing ROM assets.

Therefore, an object of the present invention is to record and record data which can correspond to both a sector containing data of a length that is an integral multiple of 512 bytes and a sector consisting of data of a byte length conforming to the CD format. A reproducing apparatus and method, and a disk medium are provided.

[0007]

To achieve the above object, the present invention provides a data recording apparatus for recording digital data on a data recording medium,
Input means for receiving first data in which the data portion is divided into a length of an integer multiple of 512 bytes and / or second data in which the data portion is divided into a byte length conforming to the CD format; Formatting means for converting the second data into a sector structure, encoding means for performing error correction coding on the data from the formatting means, and for digitally modulating the error correction coded data And a recording means for recording the recording data from the modulating means onto a data recording medium. The present invention is also a recording method for recording data as described above.

Further, according to the present invention, the first data in which the data portion is divided into a length of an integral multiple of 512 bytes and / or the second data in which the data portion is divided into a byte length conforming to the CD format are provided. Converted to sector structure,
Further, in a data reproducing apparatus for reproducing a data recording medium on which data obtained by error correction coding and digital modulation is recorded, a means for reproducing the data from the data recording medium and a digital reproduction of the reproduced data. Means for demodulating, decoding means for error correcting the demodulated data, format decomposing means for cutting out the first data and / or the second data from the error corrected data, the first Data reproducing device and / or second data transmitting means. The present invention is also a reproducing method for reproducing data as described above.

Further, according to the present invention, the data portion is 512
One of a first sector composed of first data divided into a length of an integral multiple of bytes and a second sector composed of second data divided into a byte length according to the CD format Is recorded after being subjected to error correction coding and digital modulation processing, and is recorded with the data in the TOC area.
And the header added for each second sector,
The data recording medium is characterized by identifying the first and second sectors.

Further, according to the present invention, the data portion is 5
First data divided into an integral multiple of 12 bytes,
And the second data whose data portion is divided into byte lengths conforming to the CD format are each converted into a sector structure, and the data obtained by error correction coding and digital modulation processing are recorded in different recording area portions. It is a data recording medium characterized by being recorded.

[0011]

In the physical area, it is possible to correspond to two sectors each having data having an integer multiple of 512 bytes, for example, 2,048 bytes, and a data length corresponding to the CD file, for example, 2,352 bytes. Data and CD-R for computer storage on the same recording medium
Data for OM can be ported.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows an optical disc recording system according to the present invention, and FIG. 2 shows an optical disc reproducing system. In the recording system, recording data is supplied from the input terminal 1 and recorded on the optical disc 2. The recording data is compressed video data, compressed audio data, computer data, and the like. The currently proposed recordable type of DVD (magneto-optical type or phase change type disc) is an example of the optical disc 2.
Note that the recording system of FIG.
The present invention can be applied not only to the above, but also to a mastering system for a read-only disc.

Here, the data structure of the optical disk 2 to which the present invention can be applied, in particular, the data unit for access (recording or reproduction) will be described. First CD-RO
The sector structure of M data will be described. CD-ROM
Is a development of the well-known CD. CD is Figure 3
As shown in, a transmission frame (also referred to as an EFM frame or a C1 frame) has a 1-byte subcode, 24-byte data, and 4-byte C1 parity and 4-byte C1 parity. is there. On the CD, each byte is converted into a code word of 14 channel bits by EFM modulation and recorded via a combined bit (3 channel bits). Furthermore, at the beginning of each transmission frame, 11T (T is the cycle of the channel bit)
The inversion interval of is continuous, and thereafter, a sync of 24 channel bits (meaning a synchronizing signal) is added with 2 channel bits being added.

The sub-code is constructed so that it becomes one unit with a cycle of 98 transmission frames. Therefore, the CD
-In DA (Digital Audio), user data of 24 bytes x 98 = 2,352 bytes is included in a 98 transmission frame. Including the subcode, 25 bytes x 98 = 2,450 bytes. Thus, in the CD-DA format,
There are two types of data sizes, 2,352 bytes and 2,450 bytes.

C based on the transmission format of this CD
The data structure of the D-ROM is specified. That is,
The CD-ROM has an access unit of 2,352 bytes, which is data included in 98 frames of the subcode cycle. Although this access unit is also called a block, it will be called a sector in the following description. FIG.
Indicates the data structure of one sector of the CD-ROM.

In the CD-ROM, mode 0, mode 1,
Mode 2 is specified. In common with these modes, a sync (12 bytes) and a header (4 bytes) indicating sector delimiters are added. In mode 0, data other than these syncs and headers is all "0", and is used as dummy data. FIG. 4 shows the data structure of one sector in mode 1 and mode 2. The header is CD
The sub-code consists of 3 bytes of address information and 1 byte of mode information.

In the data structure of mode 1, user data is 2,048 (2K) bytes, and auxiliary data of 288 bytes is added to enhance the error correction capability. That is, error detection code (4 bytes), space (8 bytes equivalent), P parity (172 bytes), Q
Parity (104 bytes) is added. Mode 1
Is suitable for recording data that requires high reliability, such as character codes and computer data.
In mode 2, 288 bytes of auxiliary data are not added,
Therefore, this mode allows recording of 2,336 bytes of user data. Mode 2 is suitable for recording data such as video data and audio data that can interpolate errors.

Further, the CD-I is standardized as a read-only disc similar to the CD-ROM. FIG.
Indicates the data structure of one sector of CD-I. CD-R
Similar to the OM, a 12-byte sync and a 4-byte header are added, and the mode information in the header is mode 2. In CD-I, an 8-byte subheader is added after the header. The subheader consists of a 2-byte file number, a channel number, a submode, and a data type.

Further, as in the modes 1 and 2 of the CD-ROM, the forms 1 and 2 are defined in the CD-I. In Form 1, a 4-byte error detection code, 172-byte P parity, and 104-byte Q parity are added. There is no space in the mode 1 of the CD-ROM, and the user data area is 2,048 bytes. In the form 2, a reserve area (4 bytes) is provided, and the area of user data is 2,324 bytes.

As described above, the byte length according to the CD format is basically 2,352 bytes, and depending on the handling of additional data (header, subcode, etc.),
2,340 bytes, 2,336 bytes, or 2,45 bytes
There can be 0 bytes.

Next, another example of the sector structure will be described. This is as shown in FIG. 6A.
Data sync (4 bytes) and header (16 bytes) are added to user data of 48 (= 2K) bytes, and error detection code ED for improving reliability.
C (4 bytes) is added. Therefore, the length of one sector is 2,072 bytes.

FIG. 6B shows the header data in more detail. That is, 2 bytes of the error detection code (specifically, CRC) for the header, 1 byte of management information CGMS for managing the copy permission / prohibition, discriminating between the single-layer disc and the multi-layer disc, and the layer included in the disc. The header is composed of the number, 1 byte of the layer indicating the number of the layer in which the data is recorded, 4 bytes of the address, and 8 bytes of the auxiliary data. In this embodiment, a sector ID signal for identifying the sector structure is inserted in the auxiliary data.

On the other hand, the above-mentioned CD-ROM, CD-I,
Since data conforming to the CD format such as CD-DA is 2,352 bytes, for example, this portion is used as user data and a data sync (4 bytes) and a header (12 bytes) are added as shown in FIG. 7A. . Therefore, the length of one sector is 2,368 bytes. CD-
In the case of DA, 2,352 bytes of user data are included in 98 transmission frames. As shown in an enlarged view in FIG. 7B, the header is composed of CRC (2 bytes), copy management information CGMS, layer, address, and auxiliary data (4 bytes). The header of FIG. 7B has the same information as the header shown in FIG. 6B, except that the auxiliary data has a shorter length.

As described above, the lengths of one sector are different, and there is no relation of integer ratio. In this embodiment, when two different sector sizes are A and B, nA and mB (n and m are integers, and n ≠).
The block is defined so that m, n> m) is contained in a data unit (referred to as a block) of a predetermined size. Data is recorded / reproduced (that is, accessed) in block units. For the method of defining n and m, n and m are chosen to be relatively prime. In particular, nA and m
When the sizes of B are close to each other, there are a method of considering to be configured by m = n−1 and a method of configuring by n = 2 ^j (j is a natural number). The method of defining m and n relatively prime is adopted when the block size is minimized. n = 2 ^j
The method defined as is adopted when considering affinity with a computer system.

In the above example, considering only user data, if n = 8 and m = 7 are defined, then 2,048 bytes × 8 = 16,384 bytes 2,336 bytes × 7 = 16,352 bytes, It fits in a block of 16 Kbytes (16,384) bytes.

Further, as described above, considering the sector size to which the data sync and header are added, A '= 2,072 and B' = 2,368.
When n = 8 and m = 7 are selected, the block size is 2,072 × 8 = 2,368 × 7 = 16,576 bytes, and the same common block size can be defined.

The data structure of one block in this case is (148 × 112 = 16,57) as shown in FIG.
By defining a two-dimensional array of 6 bytes) and applying an error correction code to this two-dimensional array, the error correction capability can be enhanced. As the error correction code, the first error correction code (referred to as C1 code) is encoded with respect to 162 bytes in the vertical direction (each column), and 8
A convolutional double code that generates C1 parity from bytes, encodes a second error correction code (referred to as C2 code) to 156 bytes in the diagonal direction, and adds C2 parity of 14 bytes. Can be adopted.

Of course, as the error correction code, other than this, a product code, a block completion type double coding, an LDC (Lon
g Distance Code) or the like may be adopted, and it is also possible to perform encoding using a simple error detection code.

The case where two sectors of different sizes are integrated into a block of the same size will be described more specifically with reference to FIG. FIG. 9A shows a process when the sector size shown in FIG. 6A is a sector of 2,072 bytes (hereinafter referred to as a 2 Kbyte sector). R for this 1 sector
Divide every 148 bytes in the / W direction, 148 × 14 =
A two-dimensional array of 2,072 bytes is formed. Therefore, one sector of this array is included in eight in one block, and one block forms a data structure of eight sectors.

FIG. 9B shows the processing when the sector size shown in FIG. 7A is a sector of 2,368 bytes (hereinafter referred to as a CD sector). This one sector is divided in the R / W direction for every 148 bytes to form a two-dimensional array of 148 × 16 = 2,368 bytes. Therefore, one sector of this array is included in seven in one block, and one block forms a data structure of seven sectors. At the time of recording / reproducing, a counter that counts 2,072 bytes or 2,368 bytes of data is provided, and block boundaries are determined by detecting 7 or 8 sector syncs. Not limited to this method, a block sync other than the sector sync may be added. This block is required when the error correction code is a block completion type, but is not an essential item in the present invention.

In the above description, it is assumed that one sector of data from the computer contains 2 Kbytes of data, but it is sufficient that the sector contains data of an integral multiple of 512 bytes. For example, as a sector structure including 512 × 2 = 1,024 (= 1K) bytes of data, the structure shown in FIG. 10A can be adopted. In this sector, in addition to 1,024 bytes of user data, 2 bytes of data sync, 8 bytes
A byte header and a 4-byte error detection code are included. As shown in FIG. 10B, the header includes CRC (1 byte) for header error detection, copy management information CGMS (1 byte), layer information (1 byte),
It consists of an address (4 bytes) and auxiliary data (1 byte). The meaning of each information is the same as that described above.

When this 1 Kbyte sector is divided into blocks, A = 1,024 (= 1 K) bytes, A ′
Is 1,036 bytes, the block can be similarly formed by n = 16 and m = 7. That is, as shown in FIG.
A two-dimensional array of 8 × 7 = 1,036 bytes is formed, and 16
One block of data is formed by the sector.

Referring back to FIG. 1, a recording system according to an embodiment of the present invention will be described. Digital data from the input terminal 1 is supplied to the switch circuit 5a via the interface 3, for example, SCSI, and is selectively supplied to the formatting circuits 4a and 4b by the switch circuit 5a.
These formatting circuits 4a and 4b divide the received digital data into sectors and add a data sync and a header. That is, the formatting circuit 4a converts the received data into the 2K bi-sector sector structure shown in FIG. 6A, and the formatting circuit 4b
The received data is converted into the sector structure of the CD sector as shown in FIG. 7A.

The switch circuit 5a is the interface 3
Controlled by the ID signal output from the switch circuit 5a corresponding to the data received by the interface 3
Can be switched. For example, when receiving data delimited by 2 Kbytes from the computer, the switch circuit 5a selects the formatting circuit 4a by the ID signal. On the other hand, for example, from the CD-ROM drive 2,
When the data delimited by 352 bytes is received, the switch circuit 5a selects the formatting circuit 4b. In addition, the ID signal is formatted by the formatting circuits 4a and 4b.
And the ID signal is inserted into the header of each sector, for example, as a part of auxiliary data. The output data of the formatting circuits 4a and 4b is the blocking circuit 6
Is supplied to.

Although not shown in FIG. 1, the ID signal is T
It may be supplied to the OC generation circuit to generate TOC data including the ID signal. The TOC (Table Of Contents) data includes control information, directory information, etc. of the disc and is, for example, data recorded on the innermost track, and the TOC data is read when the disc is mounted in the drive. It may be referred to as DIT (Disk Information Table), but this is also similar to TOC data.

Further, not only user data but also this TOC data may be supplied to the input terminal 1, and the TOC data may be converted into a sector structure together with the user data.
In this case, the relationship between the TOC sector composed of TOC data and the user sector composed of user data can be as follows. In the first data structure, the TOC sector is a 2K sector and the user sector is a 2K sector or a CD sector. The second data structure is T
The OC sector is a CD sector and the user sector is a CD sector. This corresponds to the case where the entire data of the CD-ROM is completely recorded on the optical disc 2.
The third one is the first TO with 2K TOC sector.
It is composed of a C sector and a second TOC sector of the CD sector, and the user sector is that of the CD sector. this is,
The entire data of the CD-ROM is recorded as a whole, and the TOC data of the optical disk 2 (for example, DVD) is recorded as 2
This corresponds to the case of configuring as a K sector.

The blocking circuit 6 constitutes a block composed of 7 sectors or 8 sectors. The data from the blocking circuit 6 is supplied to the error correction code encoder 8. The encoder 8 encodes a convolutional double encoding error correction code as shown in FIG. Specific processing of the encoder 8 will be described later.

The output of the encoder 8 is supplied to the digital modulation circuit 9. The digital modulation circuit 9 maps a 1-byte (8-bit) data symbol to a 16-bit codeword in accordance with a predetermined table to generate a modulated output with a small DC component.
Of course, EFM in CD, 8-15 modulation for converting an 8-bit data symbol into a 15-bit codeword, and the like can be adopted as digital modulation. The output of the digital modulation circuit 9 is selectively supplied to the sync addition circuits 10a and 10b via the switch circuit 5b.

The sync adding circuits 10a and 10b are provided with sync signals (sector sync, additional sync S1, C1 sync S).
2, and block sync) to the modulated data. In this embodiment, as will be described later, it is possible to identify the sector structure using the patterns of these added syncs. Sink addition circuit 10
a adds a sync for the 2 Kbyte sector to the data, and the sync adding circuit 10b adds a sync for the CD sector to the data. These syncs have peculiar bit patterns that do not appear in the modulated data.

The outputs of the sync adding circuits 10a and 10b are supplied to the optical pickup 12 via the driver 11 and recorded on the optical disc 2 by magneto-optical recording or phase change. The optical disk 2 is CLV (constant linear velocity) or CAV (constant angular velocity) by the spindle motor 13.
Is rotated by. The minimum unit of data recorded / reproduced by the optical pickup 12 is one block described above.

Recording data output from the sync adding circuits 10a and 10b will be described with reference to FIG. FIG. 12A shows recording data of a 2 Kbyte sector. FIG.
As shown in 2A, 1 sector (2,072 bytes) is 1
It is divided into 48 pieces of data, and by this convolutional double encoding, a parity P of 8 bytes and a parity Q of 14 bytes are added. Therefore,
(148 + 22 = 170) data symbols are generated. This data symbol is equally divided into 85 data symbols. Eighty-five data symbols are 85 × 16 = 1,360 by digital modulation (8-16 modulation).
Converted to channel bits.

Then, the sector sync S3 of 32 channel bits or the additional sync S1 is added to the modulation data symbols of the first half, and as a result, (1,360)
Data of one transmission frame of (+ 32 = 1,392 channel bits) is configured. An additional sync S1 of 32 channel bits is added to the latter half modulated data symbol, and one transmission frame is similarly formed. FIG. 12A
As shown in (4), (14 × 2 = 28) transmission frames form recording data of a 2 Kbyte sector. For the first transmission frame of these 28 transmission frames, C1
A sector sync S3 is added instead of the sync S2.

Recording data of the CD sector is shown in FIG. 12B. 1 by the (16 × 2 = 32) transmission frames of the same format as the above-mentioned 2 Kbytes of recording data
The recording data of the sector is constructed. The sector sync S4 is added to the head of the transmission frame instead of the C1 sync S2. In the case of this CD sector,
The frame sync for the second half modulated data symbol is also S
2. Therefore, the identification of the 2 Kbyte sector and the CD sector can be distinguished by the sector sync S3 or S4, and also by the frame sync (additional sync S1, C1 sync S2). Therefore, the sector sync may be the same, and the sector structure may be identified only by the frame sync.

FIG. 13 shows the same frame sync,
This is an example in which the sector structure is identified only by the sector sync.
That is, as shown in FIG. 13A, in the recording data of the 2 Kbyte sector, the sector sync S3 is added to the head of the sector, and as shown in FIG. 13B, the sector sync S4 is added to the head of the sector in the CD sector. At the beginning of each transmission frame to which no sector sync is added, the C1 sync S
2 and the additional sink S1 are added respectively.

As described above, the 2 Kbyte sector has 28
Since a CD sector is composed of 32 transmission frames and a CD sector is composed of 32 transmission frames, it is sufficient to switch between 28 and 32 while forming a frame and disassembling the format while maintaining frame synchronization. Management becomes easier. In addition, 1K byte sector has 14 transmission frames and 4 Kbyte sector has 56 frames.
The CD sector including the transmission frame and the subcode (the byte length of one sector is 2,516 bytes) can be configured as 34 frames. Therefore, it is possible to deal with each sector by switching 14, 56 and 34. In particular, C
When an error correction code in D or a convolutional (successive) error correction code as described later is used, it is possible to easily handle a plurality of sector sizes by only managing the number of frames.

Next, FIG. 14 shows one method for adding the block sync S5. As described above, one block consists of 8 2K byte sectors or 7 CD sectors. Therefore, for the head transmission frame of the head sector in one block, the block sync S5 is added instead of the sector sync S3 or S4. The sector sync S3 or S4 is added to the leading transmission frame of another sector. The block sync S5 may be added independently of the sector sync. Further, the block sync may not necessarily be added, and the block delimiter may be detected by counting the number of sector syncs.

FIG. 15 shows a concrete bit pattern of the sync. The bit pattern of the sync when (8-16) modulation (referred to as EFM plus) is adopted as the digital modulation method is shown. States 1, 2, 3 and 4 are
It is defined in the (8-16) modulation method, and the bit pattern of the sync in the states 1 and 2 and the state 3
And the bit pattern of the sync in 4 are respectively defined. When the most significant bit (msb) is "0", the states are 1 and 2, and when it is "1", the states are 3 and 4. The transmission frames are sequentially inserted from msb.

The bit patterns of the additional sync S1, C1 sync S2, sector sync S3 or S4, and block sync S5 are different from each other as shown in FIG. 15, and these bit patterns are codes obtained by modulating data symbols. It does not appear in the word sequence. More specifically, it can be seen that it is a sync word by including a pattern in which two inversion intervals of 11T (T: a bit cell of a channel bit) are continuous.

The reproducing circuit of the optical disc 2 on which the data is recorded as described above will be described with reference to FIG. A 2 Kbyte sector or a CD-ROM sector is recorded on the optical disc 2. As will be described later, both sectors may be recorded together on one optical disc. The sector structure can be identified by the sync pattern and the ID signal in the header of each sector. In addition,
In FIG. 2, the same reference numerals as in the recording circuit (FIG. 1) are used for the optical disc 2, the optical pickup 12, and the spindle motor 13, but this means that recording and reproduction are performed by the same device. Does not mean Particularly in the case of a read-only disc, the recording device of FIG. 1 is a mastering system and the reproducing device of FIG. 2 is a disc drive.

The reproduction data read by the optical pickup 12 is supplied to the PLL circuit 22 for clock extraction via the RF amplifier 21. Although not shown, a servo control circuit is provided on the recording side and the reproducing side in order to perform focus servo, tracking servo, feed operation (seek) control of the optical pickup 12, laser power control during recording, and the like. . The output data of the PLL circuit 22 is supplied to the sync separation circuit 23, and sync detection signals corresponding to the frame sync, sector sync, and block sync are generated from the sync separation circuit 23.

The sync detection signal is supplied to the ID signal generating circuit 24. By checking the bit pattern of the sync in the reproduction data, the sync ID signal corresponding to the sector structure of the reproduction data can be generated. Also, although not shown,
The sync detection signal is supplied to the timing generation circuit, and various timing signals such as a sector cycle and a block cycle synchronized with the reproduction data are generated.

A digital demodulation circuit 25 is connected to the sync separation circuit 23. By the processing reverse to that of the digital modulation circuit 9, the data in which the code word is converted into the data symbol is generated from the demodulation circuit 25. The decoder 2 in which the output data of the digital demodulation circuit 25 is an error correction code
6. The decoder 26 corrects the error in the reproduced data. The decoder 26 performs convolutional double-coding decoding corresponding to the encoder 8 on the recording side.

The decoded output of the decoder 26 is supplied to the block decomposition circuit 27. The block decomposing circuit 27 performs a process reverse to that of the block circuit 6 on the recording side, and the block decomposing circuit 27 outputs the sector structure data. A header identification circuit 28 and a switch circuit 29 are connected to the block decomposition circuit 27. The switch circuit 29 selectively supplies the output of the block decomposition circuit 27 to the format decomposition circuits 30a and 30b.

The header identification circuit 28 identifies the information in the header of each sector. From the sector ID signal inserted in, for example, the auxiliary data in the header, it is determined whether each sector is a 2 Kbyte sector or a CD sector. In this case, the sync ID signal is also supplied to the header identification circuit 28, and an ID signal including both the sector ID signal and the sync ID signal is generated from the header identification circuit 28. The sync ID signal is
Since it is obtained before digital demodulation, there is an advantage that the sector structure can be easily identified, and the sector ID signal is
The sector structure can be identified for each sector. Furthermore, it is possible to perform highly reliable identification using both the sector ID signal and the sync ID signal.

The switch circuit 29 is controlled by the ID signal from the header identification circuit 28. That is, when the reproduced data is a 2 Kbyte sector, the switch circuit 29 selects the format decomposition circuit 30a, and when it is a CD sector, the switch circuit 29 selects the format decomposition circuit 30b.

The format decomposing circuit 30a performs a process reverse to that of the recording side formatting circuit 4a, and the format decomposing circuit 30b performs a process reverse to that of the formatting circuit 4b. The format decomposition circuit 30a cuts out 2,048 bytes of user data from the 2 Kbyte sector, and the format decomposition circuit 30b cuts out 2,336 bytes of user data from the CD sector. The user data cut out by the format decomposition circuit 30a or 30b is supplied to the interface 31, and the interface 31 outputs the output terminal 3
The reproduction data is taken out at 2.

An example of the error correction code used in the embodiment of the present invention will be described. FIG. 16 is a block diagram showing a process of encoding an error correction code performed by the error correction code encoder 8. This error correction code is similar to the cross interleaved Reed-Solomon code (one example of convolutional double coding) adopted in CD.

The 148-byte input symbol is supplied to the C1 encoder 41. The output of the C1 encoder 41 (148 bytes of data symbols and C1 parity P of 8 bytes) is C through the delay circuit group 42 for interleaving.
2 is supplied to the encoder 43. The C2 encoder 43 forms a 14-byte C2 parity Q by encoding the [170, 156, 15] Reed-Solomon code. Further, in the C1 encoder 41, not only the data but also the C2 parity Q is C1 encoded. Therefore, the C2 encoder 43 transmits the C2 parity Q via the delay circuit group 42a.
Is fed back to the C1 encoder 41. Therefore, the C1 encoder 41 encodes the [170, 162, 9] Reed-Solomon code.

170 bytes from the C1 encoder 41 (148 bytes of data, 8 bytes of C1 parity, 1
4 bytes of C2 parity) is taken out as an output symbol through the arrangement changing circuit 44 including a delay circuit. This output symbol is supplied to the digital modulation circuit 18. The interleave length (also referred to as interleave constraint length or interleave depth) of this convolutional double coding corresponds to the maximum delay amount by the delay circuit and is 170 frames (the frame here is the C1 code sequence). It is the length and means two frames of the above-mentioned transmission frame).

The processing of the decoder corresponding to the encoder shown in FIG. 16 will be described with reference to FIG. The input symbol (170 bytes) from the digital demodulation circuit 25 is supplied to the C1 decoder 52 via the arrangement changing circuit 51. The array changing circuit 51 performs a process reverse to that of the encoder array changing circuit 44. The C1 decoder 52 uses [170, 16
2, 9] Decode the Reed-Solomon code.

The output of the C1 decoder 52 is the delay circuit group 53.
Is supplied to the C2 decoder 54 via. The C2 decoder 54 decodes the [170,156,15] Reed-Solomon code. Further, the decoded output of the C2 decoder 54 is supplied to the C1 decoder 56 via the delay circuit 55 for deinterleaving. Thus, C1 decoding, C2
The error-corrected 148-byte output symbol is extracted by the decoding and C1 decoding processes.

The error correction coding is not limited to the convolutional type, but a block completion type coding in which the error correction coding process is completed for each predetermined unit can be adopted.
However, when two sector structures are mixed on the same disc, the convolutional encoding is superior to the block completion type in that data is continuously recorded.

In the above embodiment, one optical disk has one sector structure. However, according to the present invention, two sector structures can be mixed on one optical disk. Some examples will be described with reference to FIG. First, in FIG. 18A, the recording area of the optical disc 40 is divided into a zone 41 and a zone 42, and data of different sector structures are separately recorded in each zone. In the illustrated example, the data recorded in the zone 41 has a CD sector structure, and the data recorded in the zone 42 has a 2 Kbyte sector structure.

FIG. 18B is an example in which it is possible to have different sector structures for each file. That is, the recording area is divided into file recording areas, and data of different sector structures are separately recorded in each file recording area. In the example of the figure, for example, the file recording area in the section from a to b on the track has a structure of 2 Kbyte sector,
The file recording area in the next section from c to d has a structure of a CD sector.

FIG. 18C is an example in which it is possible to have different sector structures for each track. That is, data having different sector structures is recorded separately on each track included in the recording area. For example, the data recorded on the track indicated by Ta has a structure of a 2 Kbyte sector, and the data recorded on the track indicated by Tb is
It has the structure of a CD sector.

FIG. 18D is an example in which it is possible to have different sector structures for each sector. That is, the recording area is divided into sector recording areas, and data of different sector structures are separately recorded in each sector recording area.
For example, the data recorded in the sector indicated by SECa is 2
The sector has a structure of K bytes, and the data recorded in the sector indicated by SECb has the structure of a CD sector.

Further, in order to increase the capacity of the optical disc, a single-sided multi-layer disc or a double-sided multi-layer disc has been proposed. In the case of a single-sided dual-layer disc, FIG.
As shown in E, the recording layers 43 and 44 are provided, and reading from one surface is possible. Then, the recording layer 43
CD sector structure data is recorded on the
K-byte structured data is recorded. Even in the case of a double-sided multilayer disc, different sector structures may be recorded separately for each recording surface.

In the above description, an optical disk is taken as an example, but a hard disk or a flexible disk (F
The present invention can be similarly applied to D), a semiconductor memory, and a tape-shaped recording medium.

[0069]

As described above, according to the present invention, data of an integral multiple of 512 bytes, for example, a 2 Kbyte sector and a CD sector conforming to the CD format can be handled in a physical area, and the same data recording medium can be used. Thus, both software data for computer storage and software assets for CD-ROM can be ported.

Further, according to the present invention, since error correction coding / decoding and digital modulation / demodulation can be made common to two sectors, not only the scale of hardware can be reduced, but also It becomes easy to port both software data for computer storage and software assets for CD-ROM on the same recording medium.

Further, according to the present invention, since each of the two sectors is included in an integral multiple of the number of frames of transmission data, it is possible to perform format formation and format decomposition while maintaining frame synchronization.
There is an advantage that format decomposition can be facilitated.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment of a recording circuit according to the present invention.

FIG. 2 is a block diagram of an embodiment of a reproducing circuit according to the present invention.

FIG. 3 is a schematic diagram for explaining a data structure of a conventional CD.

FIG. 4 is a schematic diagram for explaining a data structure of a conventional CD-ROM.

FIG. 5 is a schematic diagram for explaining a conventional CD-I data structure.

FIG. 6 is a schematic diagram showing an example of a data structure of a 2 Kbyte sector according to an embodiment of the present invention.

FIG. 7 is a schematic diagram showing an example of a data structure of a CD sector in one embodiment of the present invention.

FIG. 8 is a schematic diagram showing a data structure of a block in an embodiment of the present invention.

FIG. 9 is a schematic diagram showing a relationship between sectors and blocks according to an embodiment of the present invention.

FIG. 10 is a schematic diagram showing an example of a data structure of a 1 Kbyte sector to which the present invention can be applied.

FIG. 11 is a schematic diagram showing a data structure of a block composed of 1 Kbyte sectors to which the present invention can be applied.

FIG. 12 is a schematic diagram showing an example of a structure of transmission data of one sector in one embodiment of the present invention.

FIG. 13 is a schematic diagram showing another example of the configuration of transmission data of one sector in one embodiment of the present invention.

FIG. 14 is a schematic diagram showing an example of the configuration of one block of transmission data in one embodiment of the present invention.

FIG. 15 is a sector sync according to an embodiment of the present invention;
It is an approximate line figure showing a bit pattern of a frame sync and a block sync.

FIG. 16 is a block diagram showing a process of an example of a convolutional error correction encoding encoder applicable to an embodiment of the present invention.

FIG. 17 is a block diagram showing the processing of an example of a convolutional error correction coding decoder applicable to one embodiment of the present invention.

FIG. 18 is a schematic diagram used for explaining some application examples of the present invention.

[Explanation of symbols]

 1 recording data input terminal 2 optical disk 4a, 4b formatting circuit 5a, 5b switch circuit 8 error correction code encoder 9 digital modulation circuit 10a, 10b sync addition circuit

Claims (18)

[Claims] 1. A data recording apparatus for recording digital data on a data recording medium, wherein the first data and / or the data portion is divided into a data portion divided into an integral multiple of 512 bytes. Input means for receiving the second data divided into byte lengths conforming to the format, formatting means for converting the first and second data into a sector structure, and data for the formatting means. In order to perform error correction coding on the contrary, modulation means for digitally modulating the error correction coded data, and for recording the recording data from the modulation means on the data recording medium. And a recording means for storing the data. 2. The first data in which the data portion is divided into a length of an integer multiple of 512 bytes, and / or the second data in which the data portion is divided into a byte length conforming to the CD format is converted into a sector structure. Further, in a data reproducing apparatus for reproducing a data recording medium on which data obtained by error correction encoding and digital modulation processing is recorded, a means for reproducing the data from the data recording medium, A means for digitally demodulating the data, a decoding means for error correcting the demodulated data, and a format for cutting out the first data and / or the second data from the error corrected data Data comprising decomposing means and means for transmitting the first data and / or the second data Raw devices. 3. A data recording method for recording digital data on a data recording medium, wherein the first data and / or the data portion divided into a length of an integral multiple of 512 bytes is a CD. Receiving second data delimited by a byte length conforming to the format, formatting the first and / or second data into a sector structure, and applying the formatted data to the formatted data. Error correction coding, digitally modulating the error correction coded data, and recording the recording data formed by the digital modulation on the data recording medium. Characteristic data recording method. 4. The first data in which the data portion is divided into a length of an integer multiple of 512 bytes, and / or the second data in which the data portion is divided into a byte length conforming to the CD format is converted into a sector structure. In a data reproducing method for reproducing a data recording medium recorded with data which has been subjected to error correction coding and digital modulation processing, a step of reproducing the data from the data recording medium; Digitally demodulating the data; error-correcting the demodulated data; format-decomposing for cutting out the first data and / or the second data from the error-corrected data; And a step of transmitting the first data and / or the second data. 5. A first sector composed of first data whose data portion is divided into a length of an integer multiple of 512 bytes, and second data divided into a byte length conforming to the CD format. One of the second sector to be recorded is subjected to error correction coding and digital modulation processing and recorded, and the first sector is recorded by the data in the TOC area and the header added to each of the first and second sectors. And a data recording medium which identifies the second sector. 6. The first data in which the data portion is divided into a length of an integer multiple of 512 bytes, and the data portion is a CD
It is confirmed that the second data divided into byte lengths conforming to the format are converted into sector structures, respectively, and that data obtained by error correction coding and digital modulation processing is recorded in different recording areas. Characteristic data recording medium. 7. The data recording medium according to claim 5 or 6, wherein at least a part of the TOC area is partitioned into a length that is an integral multiple of 512 bytes. 8. The recording area according to claim 6, wherein the recording area comprises a plurality of recording surfaces, and the sector containing the first data and the sector containing the second data are recorded separately on the different recording surfaces. A data recording medium characterized by the following. 9. The recording area according to claim 6, wherein the recording area is divided into a plurality of zones, and the sector containing the first data and the sector containing the second data are separately recorded in the different zones. A data recording medium characterized by the above. 10. The recording area according to claim 6, wherein the recording area is divided into a plurality of tracks, and the sector containing the first data and the sector containing the second data are separately recorded on the different tracks. A data recording medium characterized by the above. 11. The recording area according to claim 6, wherein the recording area is divided into a plurality of file recording areas, and the sector containing the first data and the sector containing the second data are separated into different file recording areas. A data recording medium characterized by being recorded as. 12. The block according to claim 6, wherein each block is defined by an integer number of sectors, and the recording area is divided into a plurality of the block recording areas, the sector including the first data, and the second sector. A data recording medium characterized by being recorded separately in the block recording area different from the sector containing data. 13. The recording area according to claim 6, wherein the recording area is divided into a plurality of sector recording areas.
The data recording medium is characterized in that the sector containing the data of (1) and the sector containing the second data are separately recorded in the different sector recording areas. 14. The claim 1, claim 2, claim 3, claim 4, claim 5, or claim 6 wherein the second data is 2,352 bytes, 2,340 bytes, 2,336. A data recording / reproducing apparatus and method, and a data recording medium, which are divided into bytes or a length of 2,450 bytes. 15. The data recorded on the data recording medium according to claim 1, claim 2, claim 3, claim 4, claim 5, or claim 6, wherein transmission frames are continuous. A data recording / reproducing apparatus and method, and a data recording medium, wherein the first and second sectors of data are included in different numbers of the transmission frames. 16. The method according to claim 1, claim 2, claim 3, claim 4, claim 5, or claim 6, wherein convolutional coding is used as the error correction coding. Data recording / reproducing apparatus and method, and data recording medium. 17. The ID information for instructing a sector structure according to claim 1, claim 2, claim 3, claim 4, claim 5, or claim 6, is recorded on the data recording medium. Data recording / reproducing apparatus and method, and data recording medium. 18. The pattern of a synchronization signal added for transmission according to claim 1, claim 2, claim 3, claim 4, claim 5, or claim 6,
A data recording / reproducing apparatus and method, and a data recording medium, characterized by discriminating sector structures of first and second data.