JP2001283530A - Disk reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable access and reproduction over plural recording surfaces of a disk. SOLUTION: This disk reproducing device reproduces a disk which has 1st and 2nd recording surfaces, has recorded data composed of data frames including data blocks, and has at the head of a data frame a recorded lead-in block including information on the final block address of the 1st recording surface and the final block address in the data frame; and the focusing of an optical pickup for accessing the 1st and 2nd recording surfaces is switched according to at least the final block address of the 1st recording surface and the address of a data block to be reproduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used for a digital signal recording method and a disk reproducing apparatus. In particular, the present invention records a digital signal having a structure considering access from a host computer to a data block recorded on the disk, and reads the digital signal from the disk. The present invention relates to a disk reproducing apparatus for reproducing a digital signal.

[0002]

2. Description of the Related Art Conventionally, a disc on which a digital signal of a data block unit of this kind is recorded is a CD-RO.
M (CD-Read Only Memory). This CD-ROM is "Nikkei Byte September 1994 Issue 1
46p ", a plurality of data blocks consisting of valid data and block addresses are arranged in the recording order, and are recorded on the recording surface on the disk from the innermost circumference to the outermost circumference. . Further, when accessing and reproducing a disk recorded by the above technique according to a command from a host computer, a start block address and a transfer block length are specified together with the access command, and a desired data block is accessed and reproduced according to the start block address and the transfer block length. .

[0003]

Discs which can be read from one side with upper and lower recording surfaces of two layers formed by bonding disks together, and upper and lower recording layers which are formed separately on one disc by forming upper and lower layers separately. In recent years, the standardization of discs in which the recording surface can be read from one side and discs in which two upper and lower recording surfaces are formed and a disc which can be read from one side and which has four layers have been standardized. When a digital signal is recorded on a disc having a plurality of recording surfaces by the above-described technique, the host computer can recognize only each recording surface as an independent disk, and can access and reproduce all recording surfaces. However, there is a problem in that the interface for exchanging data with the host computer is changed, and the compatibility of the interface is lost.

In addition, in the above-described technique, since the innermost lead-in area is read before access and reproduction, there is a problem that it takes time until access is restarted every time a recording surface to be reproduced is switched.

[0005] An object of the present invention is to solve such a problem and to make it possible to access and reproduce all recording surfaces existing on the disk and to achieve high-speed access while maintaining compatibility with the current interface. A playback device is provided.

[0006]

According to the present invention, a recording method for solving the above-mentioned problem comprises a synchronizing signal indicating a boundary of a data block, a block address indicating an address of the data block on a recording medium, and data. The number of blocks that can be recorded on the recording surface of the first and second digital signals and n blocks (n is a natural number) existing on a disk readable from one side of the configured synchronization signal blocks are collected to form one data frame. Further, the information is in the same format as the synchronization signal block, and includes, in the data area, a range of block addresses to be recorded on each recording surface of the disk, a configuration of the data frame, and a flag for identifying a reproducing method thereof. Is added to the beginning of the data frame, and the m-th (m is an integer) from the lead-in block in the data frame A synchronization signal blocks up to m <n) is recorded on the first recording surface during disc natural by the number, (m + 1)
The nth to nth synchronization signal blocks are recorded on the second recording surface.

[0007] Further, the reproducing apparatus comprises: an optical pickup for reading and reproducing a signal from an optical disk; a pickup movement control circuit for performing tracking control of the optical pickup;
Access and reproduction of the optical pickup by controlling a focus control circuit for performing focus control of the optical pickup, detecting disk information contained in the lead-in block, and controlling the pickup movement control circuit and the focus control circuit; An access / reproduction control circuit for performing control, the access / reproduction control circuit comprising: at least a last block address of the first recording surface;
Focus switching of the optical pickup for accessing the first and second recording surfaces is performed according to the address of the data block to be reproduced.

[0008]

According to the present invention, all recording surfaces existing on a disc can be accessed and reproduced, and high-speed access is possible.

[0009]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a diagram showing an embodiment of a disk reproducing apparatus according to the present invention, wherein 1 is an optical disk, 2 is a disk motor, 3 is a CLV motor control circuit, 4 is an optical pickup, and 5 is an optical pickup. A preamplifier, 6 is a pickup movement control circuit,
7 is a focus control circuit, 8 is a digital signal processing circuit, 9 is an interface circuit, 10 is an interface bus, 11 is a host computer, 12 is a system controller, 13 is a disk information detection and recognition circuit, 14 is a block address detection circuit, and 15 is a block address detection circuit. A transfer end block address operation circuit 16 is an access / reproduction control circuit.

In FIG. 1, a digital signal to be transferred to a host computer 11 is recorded on a first and a second recording surface of an optical disk 1, and each recording surface can be read from one side. This optical disk 1 has C
The disk motor 2 controlled by the LV motor control circuit 3 rotates at a constant linear velocity. Digital signals are reproduced from the optical disc 1 by the optical pickup 4. At this time, the tracking control of the optical pickup 4 is performed by the pickup movement control circuit 6, and the focus control is performed by the focus control circuit 7 when the first or second recording surface is accessed.

Here, the structure of the optical disk 1 and the structure of a stored digital signal will be described with reference to FIGS. 2, 3 and 4. FIG.

As shown in FIG. 2, the structure of one data block, which is the minimum unit to be recorded on the optical disc 1, includes a synchronization signal 201 indicating the boundary of the data block, and identification of a recording area of the data block to be recorded on the optical disc. , A block address 203 indicating the address of a data block on the optical disk, and data 204.

Further, as for the data blocks, the first and second recording surfaces are present on one disk, and the number n of blocks that can be recorded on a disk whose recording surface is readable from one side is collected and recorded. A series of addresses from “1” to “n” are stored in the block address 203 of each data block. Then, a lead-in block 205 having the configuration shown in FIG. 3 is added to the head of the arrangement of these data blocks to form one data frame.

The lead-in block 205 has the same configuration as the one data block, and stores disk information 206 in its data area.
The disk identification flag 210 having the structure shown in FIG. 3 is stored, and the address “0” is stored in the block address 203.

When a series of data frames 207 formed in such a process are recorded on the optical disc 1, the data frames 207 are stored in the first recording surface 208 from the block addresses "0" to "0". Data blocks including lead-in blocks up to m ′ (m is a natural number, m <n) are recorded from the innermost periphery to the outer periphery of the first recording surface 208. Further, data blocks from block addresses (m + 1) to n are recorded from the outermost periphery to the inner periphery of the second recording surface 209.

The flag '11' is stored in the disc identification flag 210, and the last address 211 of the first recording surface indicating the address of the last data block recorded on the first recording surface is stored in a part of the area of the disk information 206. Then, the number 212 of recording blocks indicating the number n of block data recorded on the disc is recorded.

Finally, the first recording surface and the second recording surface are bonded to form one optical disk.

The reproduction of the optical disk 1 described above will be described with reference to the block diagram of FIG. 1 and the flowchart of FIG.

In FIGS. 1 and 5, before reproducing recorded data, the innermost circumference of the first recording surface of the optical disk 1 is accessed by the pickup 4 to reproduce the lead-in block 205 (step 501 in FIG. 5). After the digital signal processing circuit 8 performs predetermined signal processing such as error correction such as detection of the synchronization signal 201, detection and recognition of the disk information in the disk information 206 is performed by the disk information detection and recognition circuit 13 (step). 502). The detected disk information is sent to the interface circuit 9 and is sent to the host computer 1 via the interface bus 10 according to a predetermined protocol.
1 (step 503). In accordance with the received disk information, the host computer 11 transmits an access command, a start block address i to be accessed, and a transfer block number j to the interface circuit 9 according to a predetermined protocol (step 504).

When an instruction from the host computer 11 is received by the interface circuit 9, the access and reproduction control circuit 16 controls access and reproduction according to the disk identification flag 210 in the disk information 206 detected earlier.

If the detected identification flag 210 is other than "11" (step 505), the access / reproduction control circuit 1
6 sends a control command to the system controller 12 so as to reproduce the j-th block from the start block address i on the disk as it is.
The V motor control circuit 3 and the pickup movement control circuit 6 are controlled to perform access reproduction (steps 513 and 514), and the reproduced data is transmitted via the digital signal processing circuit 8, the interface circuit 9, and the interface bus 10. And sent to the host computer 10.

If the detected identification flag 210 is "11", it is determined that the disc is a disc recorded by the recording method shown in FIG. 2, and in the next step 506, the transfer start block address i and the first in the lead-in block are read. A comparison is made between the outermost block address m of the first recording surface obtained by detecting the recording surface final address 211 and the outermost block address m, and the recording surface from which access is started is selected. If i> m, the block address at which access is started is present on the second recording surface, and the focus of the pickup is switched (step 5).
07), access and reproduction of the j-th block from the start block address i on the second recording surface (steps 513 and 514).

If i.ltoreq.m, the start block address i is present on the first recording surface, and the transfer end address calculation circuit 15 calculates the block address (i + j) at which reproduction ends based on the start block address i and the number of transfer blocks j. And
The calculation result is compared with the recording block number n obtained by detecting the recording block number 212, and (i + j)> n
If so, the reproduction is terminated in the middle and the host computer 11 is notified via the interface circuit 9 that the reproduction is impossible.

Next, in step 508, the calculation result is compared with the outermost block address m recorded on the first recording surface. If (i + j) ≦ m, all data blocks to be reproduced exist on the first recording surface, and j blocks are accessed and reproduced from the block address i (steps 513 and 514).

If (i + j)> m, the data block to be reproduced exists continuously over the first recording surface and the second recording surface. Access is made and reproduction is performed until the block address detection circuit 14 detects the block address m (steps 509 and 510). When the block address m is detected, the focus of the pickup is switched to access the second recording surface to access the data block of the block address (m + 1) existing on the outermost periphery of the second recording surface (step 511). , Block address (m + 1) is detected (step 512), the data block is accessed, and reproduction is resumed (step 513). Then, reproduction is performed up to the block address j at which reproduction ends (step 514).

As described above, in this embodiment, the first and second
When a digital signal is recorded on a disk that can be read from one side of the disk, there are n recording blocks that can be recorded on all the recording surfaces of the disk, and n blocks of data blocks are arranged in the recording order. A data frame is formed by adding a lead-in block including disc information to the head, and blocks from the lead-in block to the block address m are recorded on the first recording surface from the innermost circumference to the outer circumference. Address (m +
By recording the blocks from 1) to n on the second recording surface from the outermost circumference to the inner circumference, a series of block addresses are allocated over all the recording surfaces on the disc, so that compatibility with the current interface is possible. It is possible to access and reproduce all the recording surfaces existing on the disc while maintaining the performance.

The reproducing apparatus detects disk information recorded in the lead-in block and controls the system controller in accordance with the information, thereby enabling access and reproduction of the disk recorded in the configuration of this embodiment. Becomes

In the recording method of this embodiment, when data blocks are continuously reproduced over the first and second recording surfaces, the amount of movement of the pickup is minimized, and High-speed access becomes possible.

In the above-described embodiment, only one recording surface, the first and second recording surfaces, can be read from one side of a single disk. However, the present invention is not limited to this, but may be applied to three or four surfaces.

The configuration and storage position of the disk identification flag 210 and the storage positions of the first recording surface final address 211 and the number of recording blocks 212 included in the disk information are not limited to the present embodiment.

The recording directions of the data frames on the first and second recording surfaces are not limited to the present embodiment.

[0033]

As described above, according to the present invention, when a digital signal is recorded on a disk which has the first and second recording surfaces and can be read from one side of the disk, all of the disk Recordable over the recording surface,
The n data blocks are arranged in the recording order, and a lead-in block including disc information is added to the head of the data block to form one data frame. Blocks from the lead-in block to the block address m are recorded on the first recording surface. Is recorded from the innermost circumference to the outer circumference, and blocks from block addresses (m + 1) to n are recorded from the outermost circumference to the inner circumference on the second recording surface, so that all the recording surfaces on the disc are recorded. Since a series of block addresses are allocated, all recording surfaces existing on the disc can be accessed and reproduced while maintaining compatibility with the current interface.

Further, according to the present invention, the reproducing apparatus detects the disc information recorded in the lead-in block,
By controlling the system controller in accordance with the information, it is possible to access and reproduce the disc.

According to the present invention, when data blocks are continuously reproduced over the first and second recording surfaces, the amount of movement of the pickup is minimized, and the second recording surface is accessed at high speed. Becomes possible.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of an embodiment of a digital signal recording method and a reproducing apparatus according to the present invention.

FIG. 2 is a diagram showing a configuration example of a data frame in the embodiment shown in FIG. 1;

FIG. 3 is a diagram showing a configuration example of a lead-in block 205 in FIG. 2;

FIG. 4 is a diagram showing a configuration example of a disk identification flag 210 in FIG. 2;

FIG. 5 is a flowchart showing an algorithm of signal processing in the embodiment shown in FIG. 1;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Optical disk, 2 ... Disk motor, 3 ... CLV motor control circuit, 4 ... Pickup, 5 ... Preamplifier, 6 ...
Pickup movement control circuit, 7 focus control circuit,
8 ... Digital signal processing circuit, 9 ... Interface circuit, 10 ... Interface bus, 11 ... Host computer, 12 ... System controller, 13 ... Disk information detection and recognition circuit, 14 ... Block address detection circuit,
15: transfer end address arithmetic circuit, 16: access and reproduction control circuit.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Masayuki Hirabayashi 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture Inside the multimedia system development headquarters of Hitachi, Ltd. (72) Inventor Yutaka Nagai Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa 292 Hitachi Multimedia System Development Division, Hitachi, Ltd. (72) Inventor Toshifumi Takeuchi 292 Yoshidacho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture Multimedia System Development Division, Hitachi, Ltd.

Claims (3)

[Claims] 1. A disk reproducing apparatus for reproducing a disk having first and second recording surfaces readable from one side and recording data composed of data frames including a plurality of data blocks. A block address is assigned to a data block included in the data frame, the data block included in the data frame is recorded over the first and second recording surfaces, and A lead-in block including information indicating the last block address of the first recording surface and the last block address in the data frame is recorded at the beginning of the data frame, and the disc reproducing device reads a signal from the optical disc. Optical pickup for reading and reproducing, and pickup movement control for tracking control of the optical pickup Circuit, a focus control circuit that performs focus control of the optical pickup, and detects disk information included in the lead-in block, and controls the pickup movement control circuit and the focus control circuit to control the optical pickup. An access / reproduction control circuit for performing access and reproduction control, wherein the access / reproduction control circuit performs at least a last block address of the first recording surface and an address of a data block to be reproduced. An optical pickup for performing focus switching of an optical pickup for accessing the first and second recording surfaces. 2. The disk reproducing apparatus according to claim 1, wherein the access / reproduction control circuit performs the focus switching, and obtains a block address obtained after accessing a target recording surface and an address of a data block to be reproduced. A disc reproducing apparatus characterized in that a moving direction in a radial direction of an optical disc is determined from the magnitude relation of the above, and a data block including a block address to be reproduced is accessed. 3. The disk reproducing apparatus according to claim 1, wherein the access / reproduction control circuit compares the last block address of the first recording surface with a block address of a reproduced data block to determine the size of the first block. A disk reproducing apparatus for performing focus switching of a pickup when performing continuous access from a last data block on one recording surface to a head data block on a second recording surface.