JP2004253067A - Information reproducing method for optical disk, information reproducing control program, and optical disk device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a technology capable of preventing an erroneous operation even when the information of a set disk is mistaken in an optical disk device. <P>SOLUTION: The type of a set optical disk is discriminated based on Disk Category information in the PFI of an optical disk . When the result of the discrimination is that the optical disk is a DVD+R disk, searching is executed in a recording area to refer to a value stored as a last address. When the referenced last address is not a predetermined address, an address in the storage area is set and stored as a new last address, and the storage area searching is finished. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a technique for searching a recording area (session search) during a reproducing operation of an optical disc device.
[0002]
[Prior art]
4 and 5 show examples of a conventional recording area search technique.
When, for example, a DVD + R disk is set in the conventional optical disk device (step S401), various parameters are adjusted so that focus servo and tracking servo are performed and a reproducing operation is performed in an optimal state. (Step S402). Thereafter, the disk drive seeks to the start address of PFI (Physical Format Information), which is the unique information of the disk itself (step S403), reads the PFI (step S404), and refers to the value of the disc category in the PFI. To determine the type of the disk (step S405). When the value of the disc category is Ah, DVD + R is determined (step S416), and a process of searching a storage area (multi-session search) is executed (step S417). In the storage area search processing, a value from the PFI start address to the 253rd to 255th bytes is referred to as the last address of the storage area (session) (step S501), and the value is stored as the last address of the set disk. (Step S502). Next, the start address of the next storage area is calculated from the last address (step S503), seek is performed to the PFI start address of the next storage area (step S504), and the PFI of the storage area is read (step S504). S506). Further, a final address is obtained based on the read PFI, and the next address is moved to the next storage area based on the final address. A series of search operations of reading the PFI, referencing and storing the last address, calculating the start address of the next storage area, and seeking to the start address are repeated for a plurality of storage areas.
[0003]
If the set DVD + R disc is a disc that violates the standard and the stored final address is, for example, 0h, a seek failure or a PFI read failure occurs during the series of operations, and the search operation ends. However, since 0h is stored as the final address, the disk capacity is determined to be 0, and a response is made to the address specified by the host computer based on the determination that the disk recording range is exceeded.
[0004]
As a technique related to the present invention and described in a patent document, there is a technique described in JP-A-2002-50040 (Patent Document 1). This publication discloses a technique for discriminating an optical disk irrespective of its type, by separating a CD or a DVD from the physical characteristics of the disk itself, reading a PFI when the disk becomes reproducible, and reading a Book Type therein. A technique is described in which (Disc Category) information is read to determine the type of a disc.
[0005]
[Patent Document 1]
JP 2002-5040 A
[Problems to be solved by the invention]
In the prior art shown in FIGS. 4 and 5, when the information of the optical disk set in the optical disk device is erroneous, the optical disk device searches the recording area based on the erroneous information, and performs a malfunction such as an error response. As a result, the reproduction operation of the optical disk becomes impossible. Japanese Patent Application Laid-Open No. 2002-50040 does not describe a technique for handling the last address when searching for a storage area for a DVD + R disc after disc discrimination.
An object of the present invention is to prevent a malfunction in an optical disk apparatus even when information on a set disk is incorrect, in view of the state of the related art.
An object of the present invention is to provide a technique capable of solving such a problem.
[0007]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the present invention basically provides an optical disc device with:
(1) The type of the set optical disc is determined from the disc category information in the PFI (Physical Format Information) of the optical disc, and when the discrimination result indicates that the optical disc is a DVD + R disc, the storage area is searched ( Session search), and refers to the value stored as the final address. If the referenced final address is not the predetermined address, the address in the storage area is set as a new final address and stored. Terminate the search (session search).
(2) The type of the set optical disc is determined from the disc category information in the PFI of the optical disc. If the discrimination result is a DVD + R disc, a search (search) of a storage area (session) is performed and stored as a final address. The value from the PFI start address of the storage area to the 253rd to 255th bytes is determined to determine whether or not the last address is 0h. If the last address is 0h, the PFI start of the storage area is determined. The value from the address to the 9th to 11th bytes is referred to and stored as the final address of the optical disk, and the storage area search (session search) is completed.
(3) The type of the set optical disc is determined from the disc category information in the PFI of the optical disc. When the discrimination result is a DVD + R disc, the value from the PFI start address of the storage area to the 253th to 255th bytes is determined. This is referred to and stored as the last address of the storage area (session) of the optical disk. Based on the stored last address, the start address of the next storage area (session) is calculated, and seek to the start address is performed. When the PFI of the next storage area (session) is read and the seek or PFI cannot be read, the value from the PFI start address of the storage area as the last address of the optical disk to the 9th to 11th bytes is read. Refer to the above storage area (session) The value of the last address of the optical disk is larger than the value of the last address of the storage area (session) as a result of comparing the value of the last address of the optical disk with the value of the last address of the 253rd to 255th bytes from the PFI start address. At this time, the last address of the optical disk is stored as the last address, and the search of the storage area (session search) is terminated.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the embodiment, a case where the recorded information is a DVD + R disc will be described.
FIG. 1 is a diagram showing a configuration example of an optical disk device as an embodiment of the present invention.
In FIG. 1, 1 is an optical disc, 2 is an optical pickup that irradiates a laser beam to the optical disc 1 to record information on the optical disc, and reads recorded information, and 3 is an optical pickup. A signal processing unit that processes a reproduction signal based on the microcomputer; 4 is a microcomputer that controls the entire apparatus; and 5 is a microcomputer that is controlled by the microcomputer 4 based on the reproduction signal from the signal processing unit 3 and a video signal, a tracking control signal, and a focus signal. A digital signal processor 6 for forming a control signal, a motor control signal, and the like, and also for performing a search process of a recording area and forming a recording signal, decodes a digitized reproduction signal in the digital signal processor 5. The decoding unit 7, which is also in the digital signal processor 5, has a tracking control signal, a focus control signal, A servo unit for forming data control signals, etc., an interface unit 8 for connecting to an external device such as a host computer, a disk motor 9 for driving an optical disk, and an actuator (not shown) in the optical pickup 2. ), A drive unit for driving a laser diode (not shown) in the optical pickup 2, a thread motor for moving the optical pickup 2, and the like, a disk motor 10 for rotating the optical disk 1 at a predetermined speed, and an optical pickup 2 for the optical pickup 2. Is a sled motor for moving the optical disk 1 in the radial direction of the optical disk 1. In this configuration, the microcomputer 4 and the digital signal processor 5 form a control unit. In this configuration example, the control unit includes a storage unit such as a memory therein.
[0009]
In the configuration described above, at the time of reproducing information, the recorded information on the optical disk 1 is read by the optical pickup 2, and the read information (reproduction signal) is input to the signal processing unit 3 to perform reproduction signal processing. When the control unit including the microcomputer 4 and the digital signal processor 5 has the first configuration, the control unit forms a focus control signal and a tracking control signal based on the reproduction signal, and generates a focus control signal and a tracking control signal during the PFI of the optical disc 1. The type of the optical disc 1 is determined from the disc category information of the optical disc 1, and as a result of the discrimination, when the optical disc 1 is a DVD + R disc, the type of the storage stored in the storage unit as the last address of the recording area of the optical disc 1 Referring to values from the 253rd byte to the 255th byte from the PFI start address of the area, it is determined whether or not the final address is 0h. As a result of the determination, if the final address is 0h, the PFI of the storage area is determined. The value from the start address to the 9th to 11th bytes is the final address of the optical disc. And stored in the storage unit. Thereby, the normal / abnormal determination of the last address recorded on the optical disc 1 is performed at the time of searching the recording area (at the time of the session search), and when it is determined that the address is abnormal, the search is terminated so that unnecessary search is not performed. I do. When the control unit including the microcomputer 4 and the digital signal processor 5 has the second configuration, the control unit forms a focus control signal and a tracking control signal based on the reproduction signal, The type of the optical disc 1 is determined from the disc category information in the PFI. If the discrimination result indicates that the optical disc 1 is a DVD + R disc, the type is stored in the storage unit as the last address of the recording area of the optical disc 1. The value from the PFI start address to the 253rd to 255th bytes is referred to and stored as the last address of the storage area of the optical disc 1.
Further, the start address of the next storage area is calculated based on the stored final address, and the PFI of the next storage area is read by seeking to the calculated start address. If the seek or PFI cannot be read, the values from the PFI start address as the last address of the optical disc to the 9th to 11th bytes are referred to, and the PFI start address as the last address of the storage area is referred to. When the value of the last address of the optical disc 1 is larger than the value of the last address of the storage area, the last address of the optical disc 1 is set to the last address. This is stored as the address, and the search of the storage area is terminated.
[0010]
FIG. 2 is a diagram showing an example of a procedure of a storage area search process of the optical disk when the control unit in the optical disk device of FIG. 1 has the first configuration. This processing example is a processing example for a disk whose recorded information is a DVD + R disk, and is an example in which it is determined whether or not the final address is normal after reading the PFI.
In FIG.
(1) The value from the PFI start address of the storage area to the 253rd to 255th bytes is referred to as the last address of the storage area (session) (step S201).
(2) It is determined whether or not the last address is 0h (step S202).
(3) As a result of the determination, if the final address is 0h, the value from the PFI start address of the storage area to the 9th to 11th bytes is referred to as the final address of the optical disk (step S203).
(4) The last address of the optical disk referred to is stored in the storage unit (step S204), and the search of the storage area (session search) is terminated (step S205).
(5) In the above (2) (step S202), if the last address is not 0h, from the PFI start address of the storage area as the last address of the storage area (session) referred to, from the 253th byte to the 255th byte Is stored as the last address of the optical disk (step S206).
(6) The start address of the next storage area is calculated based on the stored last address (step S207).
(7) Seek to the PFI start address of the next storage area (step S208).
(8) It is determined whether or not the seek was successful (step S209).
(9) If successful, read the PFI of the storage area (step S210).
(10) It is determined whether the reading of the PFI has succeeded (step S211).
(11) If successful, the process returns to (1) (Step S201).
(12) When the seek is not successful in the determination in the above (7) (step S208) or when the reading of the PFI is not successful in the determination in the above (10) (step S211), it is determined whether or not retry is over. Is determined (step S212).
(13) If the retry is over, the storage area search (session search) is terminated (step S213). If the retry is not over, the process returns to (7) (step S208).
[0011]
FIG. 3 is a diagram showing an example of a procedure of a storage area search process of the optical disk when the control unit in the optical disk device of FIG. 1 has the second configuration. This processing example is also a processing example for a disc whose recorded information is a DVD + R disc, and is an example in which it is determined whether or not the final address is normal after a seek failure or PFI read failure. .
In FIG.
(1) The value from the PFI start address of the storage area as the last address of the storage area (session) to the 253rd to 255th bytes is referred to (step S301).
(2) The last address referred to is stored as the last address of the optical disk (step S302).
(3) The start address of the next storage area is calculated based on the stored last address (step S303).
(4) Seek to the PFI start address of the next storage area (step S304).
(5) It is determined whether or not the seek was successful (step S305).
(6) If successful, read the PFI of the storage area (step S306).
(7) It is determined whether or not the reading of the PFI is successful (step S307).
(8) If successful, the process returns to (1) (step S301).
(9) If the seek is not successful in the determination in the above (5) (step S305) or if the reading of the PFI is not successful in the determination in the above (7) (step S307), whether or not retry is over Is determined (step S308).
(10) In the case of retry over, the value from the PFI start address of the storage area to the 9th to 11th bytes as the last address of the storage area is referred to as the last address of the optical disk (step S309).
(11) The value of the last address of the optical disk is compared with the value of the last address of the storage area (step S310).
(12) If the result of the comparison indicates that the value of the final address of the optical disk is larger than the value of the final address of the storage area, the final address of the optical disk is stored in the storage unit as the final address of the optical disk (step S311). The area search (session search) is terminated (step S312).
[0012]
According to the above embodiment, it is possible to prevent the optical disk apparatus from malfunctioning even when the information of the set disk is incorrect. Further, unnecessary search of the storage area can be eliminated. For example, a DVD + R disc and a disc violating the standard where the last address of the storage area is an illegal value or a disc other than the DVD + R disc is recorded as a DVD + R disc and the last address of the storage area is This is effective for discs that violate the standard that are illegal values.
[0013]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to this invention, even if the information of the set disk is different from the value prescribed | regulated by the standard in an optical disk apparatus, it can avoid becoming a reproduction | reproduction impossible state.
[Brief description of the drawings]
FIG. 1 is a diagram illustrating a configuration example of an optical disc device as an embodiment of the present invention.
FIG. 2 is a diagram illustrating an example of a storage area search process of an optical disc according to the present invention.
FIG. 3 is a diagram showing another example of the storage area search processing of the optical disc according to the present invention.
FIG. 4 is an explanatory diagram of a conventional storage area search process for an optical disc.
FIG. 5 is an explanatory diagram of a conventional storage area search process for a DVD + R disc.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Optical disk, 2 ... Optical pick-up, 3 ... Signal processing part, 4 ... Microcomputer, 5 ... Digital signal processor, 6 ... Decoding part, 7 ... Servo part, 8 ... Interface part, 9 ... Drive part, 10 ... Disk motor, 11: Thread motor.

Claims (10)

An information reproducing method for an optical disc for reproducing information recorded on an optical disc, comprising:
Reading the PFI of the optical disk set in the optical disk device;
The type of the optical disc is determined from the disc category information in the PFI. If the discrimination result indicates that the optical disc is a DVD + R disc, the storage area is searched, and the value stored as the final address is referred to. Steps to
When the last address referred to is not a predetermined one, setting and storing an address in the storage area as a new final address;
Ending the storage area search;
Reproducing the information of the optical disk set through the above-mentioned method. An information reproducing method for an optical disc for reproducing information recorded on an optical disc, comprising:
Performing focus control and tracking control on the optical disk set in the optical disk device;
Reading the PFI of the optical disc;
Determining the type of the optical disc from the disc category information in the PFI;
As a result of the determination, when the optical disk is determined to be a DVD + R disk, the storage area is searched, and a value from the PFI start address of the storage area stored as the last address to the 253rd to 255th bytes is referred to. Determining whether the final address is 0h;
As a result of the determination, when the final address is 0h, referring to and storing a value from the 9th to 11th bytes from the PFI start address of the storage area as the final address of the optical disc;
Ending the storage area search;
Reproducing the information of the optical disk set through the above-mentioned method. An information reproducing method for an optical disc for reproducing information recorded on an optical disc, comprising:
A first step of performing focus control and tracking control on the optical disk set in the optical disk device;
A second step of reading the PFI of the optical disc;
A third step of determining the type of the optical disc from the disc category information in the PFI;
As a result of the determination, when the optical disk is determined to be a DVD + R disk, the storage area is searched, and the value from the PFI start address of the storage area stored as the last address of the storage area to the 253rd to 255th bytes And a fourth step of determining whether or not the final address is 0h,
As a result of the determination, when the final address is 0h, a fifth step of referring to and storing a value from the PFI start address to the 9th to 11th bytes from the PFI start address of the storage area as the final address of the optical disc;
A sixth step of ending the storage area search;
When it is determined in the fourth step that the last address of the storage area is not 0h, a seventh step of storing the last address of the storage area as the last address of the optical disc;
An eighth step of calculating a start address of the next storage area based on the stored last address;
A ninth step of seeking to the PFI start address of the next storage area, reading the PFI of the storage area, and referring to the last address of the storage area;
A tenth step of finally ending the search of the storage area;
And reproducing information from the optical disk set therein. An information reproducing method for an optical disc for reproducing information recorded on an optical disc, comprising:
A first step of performing focus control and tracking control on the optical disk set in the optical disk device;
A second step of reading the PFI of the optical disc;
A third step of determining the type of the optical disc from the disc category information in the PFI;
If it is determined that the optical disk is a DVD + R disk as a result of the determination, the storage area is searched for, the value from the PFI start address of the storage area to the 253rd to 255th bytes is referenced, and this value is referred to as the last of the storage area. A fourth step of storing as an address;
A fifth step of calculating a start address of a next storage area based on the stored last address;
A sixth step of seeking to the calculated start address, reading the PFI of the next storage area, and reading the last address of the storage area;
When the seek or PFI cannot be read in the sixth step, the value from the PFI start address of the storage area to the 9th to 11th bytes is referred to as the last address of the optical disk, and the last address of the storage area is referred to. A seventh step of comparing the value from the PFI start address to the value from the 253rd byte to the 255th byte;
As a result of the comparison, when the value of the last address of the optical disc is larger than the value of the last address of the storage area, the last address of the optical disc is stored as the last address, and the search of the storage area is completed. Steps and
Reproducing the information of the optical disk set through the above-mentioned method. An optical disc information reproduction control program for reproducing information recorded on an optical disc,
On the computer,
Reading the PFI of the optical disk set in the optical disk device;
The type of the optical disc is determined from the disc category information in the PFI. If the discrimination result indicates that the optical disc is a DVD + R disc, the storage area is searched, and the value stored as the final address is referred to. Steps to
When the last address referred to is not the predetermined address, a procedure for setting and storing an address in the storage area as a new final address;
Steps to end the storage search,
A program for controlling the reproduction of information on an optical disk, wherein the program causes the optical disk device to reproduce information from the optical disk set above. An optical disc information reproduction control program for reproducing information recorded on an optical disc,
On the computer,
A procedure for performing focus control and tracking control on the optical disc set in the optical disc device;
Reading the PFI of the optical disc;
A step of determining the type of the optical disc from the disc category information in the PFI;
As a result of the determination, when the optical disk is determined to be a DVD + R disk, the storage area is searched, and a value from the PFI start address of the storage area stored as the last address to the 253rd to 255th bytes is referred to. Determining whether or not the last address is 0h;
As a result of the determination, when the final address is 0h, a procedure of referring to and storing a value from the 9th to 11th bytes from the PFI start address of the storage area as the final address of the optical disc;
Steps to end the storage search,
A program for controlling the reproduction of information on an optical disk, wherein the program causes the optical disk device to reproduce information from the optical disk set above. An optical disc information reproduction control program for reproducing information recorded on an optical disc,
On the computer,
A first procedure for performing focus control and tracking control on an optical disk set in the optical disk device;
A second procedure for reading the PFI of the optical disc;
A third procedure for determining the type of the optical disc from the disc category information in the PFI;
As a result of the determination, when the disc is a DVD + R disc, the storage area is searched for, the value from the PFI start address of the storage area to the 253th to 255th bytes is referenced, and this value is referred to as the last of the storage area. A fourth procedure for storing as an address;
A fifth procedure of calculating a start address of the next storage area based on the stored last address;
A sixth procedure for seeking to the PFI start address of the next storage area, reading the PFI of the next storage area, and reading the last address of the storage area;
If the seek or PFI cannot be read in the sixth step, the value from the PFI start address of the storage area to the 9th to 11th bytes is referred to as the last address of the optical disk, and the last address of the storage area is referred to. A seventh procedure for comparing values from the PFI start address of the storage area to the 253rd to 255th bytes of the storage area;
As a result of the comparison, when the value of the last address of the optical disc is larger than the value of the last address of the storage area, an eighth procedure for storing the last address of the optical disc as the last address and terminating the search of the storage area. When,
A program for controlling the reproduction of information on an optical disk, wherein the program causes the optical disk device to reproduce information from the optical disk set above. An optical disc device for recording and / or reproducing information with respect to a set optical disc,
An optical pickup for reading information recorded on the optical disc;
A signal processing unit that processes a reproduction signal based on the read information;
The PFI of the optical disk set in the optical disk device is read based on the reproduction signal, and the type of the optical disk is determined from the disc category information in the PFI. As a result of the determination, the optical disk is determined to be a DVD + R disk. At this time, the storage area is searched to refer to the value stored as the final address, and when the referenced final address is not the predetermined address, the address in the storage area is set as a new final address and stored. A control unit for causing
An optical disk device comprising: An optical disc device for recording and / or reproducing information with respect to a set optical disc,
An optical pickup for reading information recorded on the optical disc;
A signal processing unit that processes a reproduction signal based on the read information;
A focus control signal and a tracking control signal are formed based on the reproduction signal, and at the time of reproduction, the type of the optical disk is determined from the disc category information in the PFI of the optical disk. As a result of the determination, the optical disk is a DVD + R disk Is determined, the value from the PFI start address of the storage area stored as the last address of the recording area of the optical disk to the 253th to 255th bytes is referred to determine whether or not the last address is 0h. When the result of the determination indicates that the final address is 0h, a control unit that refers to and stores a value from the PFI start address of the storage area to the 9th to 11th bytes as the final address of the optical disc,
It is characterized in that the normal / abnormal judgment of the last address recorded on the optical disc is performed at the time of searching the recording area, and when it is determined that the address is abnormal, the search is terminated and the subsequent unnecessary search is not performed. Optical disk device. An optical disc device for recording and / or reproducing information with respect to a set optical disc,
An optical pickup for reading information recorded on the optical disc;
A signal processing unit that processes a reproduction signal based on the read information;
A means for forming a focus control signal and a tracking control signal based on the reproduction signal; a means for discriminating the type of the optical disc from disc category information in the PFI of the optical disc during reproduction; When the disc is a DVD + R disc, means for referring to a value from the PFI start address of the storage area to the 253th byte to the 255th byte and storing this as the last address of the storage area of the optical disc, and the stored last address Means for calculating the start address of the next storage area, and seeking to the calculated start address, reading of the PFI of the next storage area, and when the seek or PFI cannot be read, PFI of the storage area as the last address of the optical disk Means for referring to the value from the start address to the 9th to 11th bytes and comparing the value from the PFI start address of the storage area as the last address of the storage area to the value from the 253th to 255th byte, and the result of the comparison; Means for storing the last address of the optical disc as the last address and terminating the search of the storage area when the value of the last address of the optical disc is larger than the value of the last address of the storage area. A control unit;
It is characterized in that the normal / abnormal judgment of the last address recorded on the optical disc is performed at the time of searching the recording area, and when it is determined that the address is abnormal, the search is terminated and the subsequent unnecessary search is not performed. Optical disk device.

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