JP3856432B2 - High speed reproduction processing method and information reproduction apparatus for information reproduction apparatus - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a high-speed reproduction processing method and an information reproduction apparatus for an information reproduction apparatus that records or reproduces information using an information recording medium capable of rewriting information.
[0002]
[Prior art]
Recently, for the purpose of recording and reproducing information with high density, an information reproducing apparatus has been developed in which the information is recorded on an optical disk and the information is extracted by an optical pickup during reproduction. This information reproducing apparatus irradiates an optical disc on which information is recorded with a beam of light having a predetermined wavelength such as a laser beam from an optical pickup, and receives reflected light from the optical disc, whereby the information recorded on the optical disc is received. It can be taken out.
[0003]
By the way, conventionally, when recording information on a DVD-RAM disk, for example, when normal information could not be recorded in a regular recording area due to factors such as scratches or dust on the optical disk, that is, when there was a defective part, Information is written to spare areas prepared on the inner and outer circumferences of the optical disk. For this reason, when reading information from a DVD-RAM disc in which information is written in the spare area, it becomes necessary to read the information recorded in the spare area.
[0004]
However, when information is being read at a position close to the spare area on the inner circumference side, if the information that should originally be recorded in the defective portion is recorded in the spare area on the outer circumference side, it is intentionally taken into the spare area on the outer circumference side. The process of jumping and reading the information recorded in the spare area and then returning to the original was taken. Similarly, when information is being read out at a position close to the spare area on the outer peripheral side, if the information that should be recorded in the defective part is recorded in the spare area on the inner peripheral side, bother The process of jumping to the spare area on the circumferential side, reading the information recorded in the spare area, and then returning to the original area was taken.
[0005]
[Problems to be solved by the invention]
As described above, in the conventional information reproducing apparatus, when reading the information of the DVD-RAM disc in which the information is recorded in the spare area prepared for supplementing the information of the defective portion, the inner information side or the outer periphery side is temporarily read. We were going through the reserve area. For this reason, if there is a defective portion during reading, the spare area on the inner circumference side or outer circumference side of the disc is accessed every time, so that there is a problem that the read speed of the recorded information becomes slow.
[0006]
In addition, CLV playback is used to read information recorded on a DVD-RAM disc, and the rotational speed of the disc motor is greatly different between the inner and outer peripheral sides of the disc. Therefore, when there is a defective part on the disk, the optical pickup moves to read information on the spare area on the inner circumference side or the outer circumference side, and moves to return to the original reading position from the moved spare area. Therefore, it takes time to control the rotation speed of the disk motor, resulting in a problem that the reading speed of the recorded information becomes slow. Further, since the rotational speed of the disk motor changes greatly as the moving distance of the optical pickup increases, there is a problem that the burden on the disk motor becomes heavy.
[0007]
The present invention is to solve such a problem, and realizes a high-speed playback processing method and information playback apparatus for an information playback apparatus capable of shortening the reading speed when reading information recorded in a spare area. For the purpose.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides an information recording area in which information can be recorded, a spare area in which the information is recorded in place of a defective portion generated in the information recording area, and a recording in the spare area. In the high speed reproduction processing method of an information reproducing apparatus for reproducing an information recording medium having a defect management area for storing defect management information for managing a spare area address of the information and a defect address of the defective portion, the defect management Regenerating the defect management information stored in an area; determining from the regenerated defect management information whether a distance between the defect address and the spare area address is greater than a predetermined value; If it is determined that they are separated, the step of storing the information recorded in the spare area address, and the information recording area A step of reproducing the recorded information, and a step of comparing the address of the information with the spare area address to determine whether or not they match when the information is being reproduced. If the determination is made, the stored information is reproduced.
[0009]
According to the above configuration, the recording area and the address of the spare area are stored in the memory in advance according to the distance between the defective part on the optical disc and the spare area prepared to make up for the defective part. The reading speed of recorded information can be increased.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings.
[0011]
FIG. 1 is a block diagram showing the overall configuration of an information reproducing apparatus according to an embodiment of the present invention.
In FIG. 1, an optical disc 1 is composed of, for example, a DVD-RAM, and a user area in which recording information is recorded and information recorded in a defective portion of the user area are recorded in a spare area prepared on the inner and outer circumferences of the disc. It is what has been. Here, the defect portion indicates all the defects regardless of the size of the defect, and the defect portions are collectively used as a defect address.
The optical disk 1 is rotationally driven by a spindle motor 5 at a predetermined speed. The rotation speed of the spindle motor 5 is controlled by a spindle motor driver 6.
[0012]
The optical pickup 7 is configured to record an information signal by irradiating a recording layer of the optical disc 1 with a laser beam via an objective lens 9 and to detect the reflected light from the recording layer to reproduce the information signal. The objective lens 9 is driven so as to be moved closer to or away from the optical disc 1 by a focus actuator 11 having a magnet (not shown) and a moving coil that cooperates with the magnet. Similarly to the focus actuator 11, the objective lens 9 can be moved in the radial direction of the optical disc 1 by a tracking actuator 13 having a magnet and a moving coil (not shown). Laser light emitted from a semiconductor laser (not shown) provided in the optical pickup 7 is condensed on the recording layer of the optical disk 1 through the objective lens 9 and reflected by being changed depending on the presence or absence of pits on the optical disk 1. The light is received by a photodetector (not shown).
[0013]
The RF amplifier 14 includes, for example, an adder and a subtracter, and generates and outputs a focus error signal, a tracking error signal, and a reproduction signal from the information signal received by the photodetector. This reproduction signal includes defect management information read at the initialization stage of the information reproducing apparatus. Based on the generated focus error signal and tracking error signal, the servo processing circuit 15 generates a focus control signal and a tracking control signal so that the laser beam is surely converged on the pit row to be tracked, and a focus actuator 11, supplied to the tracking actuator 13. As a result, a servo loop is formed and servo control is performed.
[0014]
The defect detection circuit 17 detects a defective portion and an address where information to be originally recorded in the defective portion is recorded based on the reproduction signal generated by the RF amplifier 14, and is a system controller described later. Output to 50. The memory 19 stores information recorded in the spare area and the address of the spare area in which this information is recorded. The signal processing circuit 21 converts the reproduction signal generated by the RF amplifier 14 into an electric signal. The decoder 23 performs decoding processing such as 8-16 demodulation and error correction processing on the electrical signal converted by the signal processing circuit 21. The buffer memory 31 temporarily buffers data to be recorded transmitted from the host computer 29 via the interface 27. The buffer manager 25 manages the buffer memory 31. For example, the capacity of data buffered in the buffer memory 31 is monitored. The interface 27 is responsible for passing data exchanged between the information reproducing apparatus and the host computer 29. The encoder 33 performs encoding processing such as 8-16 demodulation and error correction processing on the recording information transmitted from the host computer 29 via the interface 27. The recording waveform generation circuit 35 generates a recording pulse signal for recording on the optical disc 1 from the recording information encoded by the encoder 33. The LD drive control circuit 37 controls the semiconductor laser provided in the optical pickup 7 based on the recording pulse signal generated by the recording waveform generation circuit 35. The system controller 50 controls the entire information reproducing apparatus.
[0015]
FIG. 2 shows that when a record portion recorded on the inner circumference side of the optical disc 1 is read and a defect portion exists in a certain portion (D1), information to be originally recorded on the defect portion is reserved on the inner circumference side. It is a figure which shows the state currently recorded on the area X1. It is assumed that the distance between the defective part D1 and the spare area X1 is a predetermined distance or less.
[0016]
FIG. 3 shows that when a recording part recorded on the inner circumference side of the optical disc 1 is read and a defective part exists in a certain part (D1), information to be originally recorded on the defective part is a spare area on the outer peripheral side. It is a figure which shows the state currently recorded on Y1. It is assumed that the distance between the defective portion D1 and the spare area Y1 is a predetermined distance or more.
[0017]
The optical disc 1 shown in FIGS. 2 and 3 is provided with a lead-in area, a spare area on the inner circumference side, a user area, a spare area on the outer circumference side, and a lead-out area from the inner circumference to the outer circumference. . The lead-in area in the innermost periphery is provided with a defect management area for performing defect management of the disk. In this defect management area, the defect part on the disk and information to be recorded in the defect part are stored in the spare area. Defect management information indicating whether or not the address (spare area address) is recorded is stored. In the spare area on the inner circumference side and the spare area on the outer circumference side, information to be recorded in the defective part is stored, and in FIG. 2, the spare area on the inner circumference side is stored in FIG. 2, and in the spare area on the outer circumference side in FIG. . In the lead-out area on the outermost periphery, defect management information is stored as in the lead-in area.
[0018]
Next, FIG. 4 is a flowchart showing the operation of the information reproducing apparatus according to the embodiment of the present invention. A series of operations in the information reproducing apparatus of the present invention will be described with reference to FIGS.
[0019]
First, at the stage of initialization of the information reproducing apparatus, the optical pickup 7 reads out defect management information recorded in the lead-in area under the control of the system controller 50. (Step S1). The defect detection circuit 17 detects whether or not there is a defective portion in the user area of the optical disc 1 from the defect management information read by the optical pickup 7 (step S3). If there is no defective portion in the user area (N in step S5), the defect detection circuit 17 notifies the system controller 50 to that effect, and the optical pickup 7 controls the user of the optical disc 1 according to the control of the system controller 50. Reading of the record information recorded in the area is started (step S21). When a defective portion exists in the user area (Y in step S5), that is, when the defective portion D1 (defect address D1) in FIGS. 2 and 3 is detected, the defect detection circuit 17 detects the defective portion D1 and the defect. It recognizes the address X1 (or address Y1) of the spare area in which information is recorded instead of the part D1, and notifies it to the system controller 50 (step S7). Based on this notification, the system controller 50 stores the defective portion D1 and the spare area address X1 (or address Y1) in the memory 19 (step S9). If there are a plurality of defective portions, they are similarly stored.
[0020]
Next, the system controller 50 detects the distance between the defective portion D1 detected by the defect detection circuit 17 and the spare area address X1 (or address Y1) (step S11). Then, it is determined whether or not the distance between the defective portion D1 and the spare area address X1 (or address Y1) is equal to or greater than a predetermined value (step S13). The predetermined value is based on the number of tracks, for example. When it is assumed that information to be originally recorded in the detected defective portion D1 is at the spare area address X1 (see FIG. 2), the distance between the defective portion D1 and the spare area address X1 is equal to or less than a predetermined value. (N in step S15), the process proceeds to step S21. On the other hand, when the information to be originally recorded in the defective portion D1 is at the spare area address Y1 (see FIG. 3), the distance between the defective portion D1 and the spare area address Y1 is determined to be greater than or equal to a predetermined value. (Y of step S15), the system controller 50 controls the optical pickup 7 so as to read the information recorded at the address Y1 of the spare area. Based on this control, the optical pickup 7 moves to the address Y of the spare area on the outer peripheral side, and reads the information recorded at the address Y1 (step S17). The system controller 50 stores the information recorded in the spare area address Y1 read by the optical pickup 7 in the memory 19 (step S19). In other words, only those in which the distance between the defective portion and the spare area address is determined to be greater than or equal to a predetermined value are stored in the memory 19.
[0021]
Thereafter, the optical pickup 7 starts reading the recorded information recorded in the user area of the optical disc 1 under the control of the system controller 50 (step S21). The system controller 50 determines whether or not the spare area address stored in the memory 19 matches with monitoring the address of the recording information read from the user area by the optical pickup 7 (step S23). That is, it is monitored whether the address of the read recording information matches the spare area address Y1 stored in the memory 19. If they do not match (N in step S25), the system controller 50 controls the optical pickup 7 so as to continuously read the recorded information recorded in the user area of the optical disc 1 (step S29). On the other hand, if they match (Y in step S25), that is, if they match the spare area address Y1, the system controller 50 reads the information recorded in the spare area address Y1 from the memory 19 (step S27), and this reading is finished. Thereafter, the optical pickup 7 is controlled so as to continuously read the recorded information recorded in the user area of the optical disc 1 (step S29). Further, when a defective portion is recognized on the optical disc 1, the processing from step S23 to step S29 is repeated.
[0022]
As described above, the recording information recorded in the spare area is stored in the memory in advance in accordance with the distance between the defective part on the optical disc 1 and the spare area prepared to compensate for the defective part. The reading speed of recorded information in the user area can be increased. That is, when the distance between the defective portion and the spare area address is relatively long (more than a predetermined value), the information is read from the memory 19 instead of reading the information from the spare area, so that the reading speed should be higher than the conventional one. Can do. Further, since the change in the rotational speed of the disk motor is larger as the moving amount of the optical pickup 7 is larger during CLV reproduction, the memory 19 can be used when the distance between the defective portion and the address of the spare area is relatively far as described above. Since the information is read out, the optical pickup can be prevented from moving over a long distance, and as a result, the reading speed can be increased.
[0023]
【The invention's effect】
As described above, the information recorded in the spare area address is stored in the memory when the distance between the defective part on the disk and the spare area address is equal to or greater than a predetermined value at the initialization stage of the information reproducing apparatus. As a result, even if there is a defective portion during reading of the user area information, if it is relatively far from the spare area, reading is performed from the memory, so that the access time can be shortened and the read speed of the recorded information can be increased.
[0024]
Further, at the time of CLV reproduction, the rotational speed of the disk motor is greatly different between the inner periphery and the outer periphery, so when reading information, it cannot be read out until the rotational speed of the disk motor has settled. Therefore, in the present invention, even if there is a defective part during reading of the user area information, if it is relatively far to the spare area, it is read from the memory, so there is no need to move the optical pickup, and until the rotational speed of the disk motor settles. It is no longer impossible to read, and as a result, the reading speed can be increased. Furthermore, since it is not necessary to control the rotational speed of the disk motor, the burden on the disk motor can be reduced.
[Brief description of the drawings]
FIG. 1 is a block configuration diagram showing an overall configuration of an information reproducing apparatus according to an embodiment of the present invention.
FIG. 2 shows that when a recording part recorded on the inner circumference side of an optical disc is read and a defective part exists in a certain part (D1), information to be originally recorded on the defective part is a spare area on the inner circumference side. It is a figure which shows the state currently recorded on X1.
FIG. 3 shows that when a recording part recorded on the inner circumference side of an optical disc is read and a defective part exists in a certain part (D1), information to be originally recorded in the defective part is a spare area Y1 on the outer peripheral side. It is a figure which shows the state currently recorded on.
FIG. 4 is a flowchart for explaining the operation of the information reproducing apparatus according to the embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Optical disk 5 Spindle motor 6 Spindle motor driver 7 Optical pick-up 14 RF amplifier 15 Servo processing circuit 17 Defect detection circuit 19 Memory 21 Signal processing circuit 23 Decoder 25 Buffer manager 27 Interface 29 Host computer 31 Buffer memory 33 Encoder 35 Recording waveform generation circuit 37 LD drive control circuit

Claims (5)

An information recording area in which information can be recorded, a spare area in which the information is recorded instead of a defective portion generated in the information recording area, a spare area address of the information recorded in the spare area, and the defective portion In a high speed reproduction processing method of an information reproducing apparatus for reproducing an information recording medium having a defect management area for storing defect management information for managing defect addresses,
Regenerating the defect management information stored in the defect management area;
Determining whether or not the distance between the defect address and the spare area address is a predetermined value or more from the reproduced defect management information;
Storing the information recorded in the spare area address when it is determined that the distance is greater than or equal to a predetermined value;
Reproducing the information recorded in the information recording area;
When this information is being reproduced, comparing the address of the information with the spare area address to determine whether they match,
A high-speed playback processing method for an information playback apparatus, comprising: a step of playing back the stored information when it is determined that they match. An information recording area in which information can be recorded, a spare area in which the information is recorded instead of a defective portion generated in the information recording area, a spare area address of the information recorded in the spare area, and the defective portion In a high speed reproduction processing method of an information reproducing apparatus for reproducing an information recording medium having a defect management area for storing defect management information for managing defect addresses,
Regenerating the defect management information stored in the defect management area;
Storing the defect address and the spare area address based on the reproduced defect management information;
Determining whether a distance between the stored defect address and the spare area address is a predetermined value or more;
Storing the information recorded in the spare area address when it is determined that the distance is greater than or equal to a predetermined value;
Reproducing the information recorded in the information recording area;
When this information is being reproduced, comparing the address of the information with the spare area address to determine whether they match,
A high-speed playback processing method for an information playback apparatus, comprising: a step of playing back the stored information when it is determined that they match. 3. The high-speed reproduction processing method for an information reproducing apparatus according to claim 1, wherein the determining step determines the distance between the defective address and the spare area address based on the number of tracks. 3. The high-speed reproduction processing method for an information reproducing apparatus according to claim 1, wherein the storing step stores the defect address, the spare area address, and the information in a nonvolatile memory. An information recording area in which information can be recorded, a spare area in which the information is recorded instead of a defective portion generated in the information recording area, a spare area address of the information recorded in the spare area, and the defective portion In an information reproducing apparatus for reproducing an information recording medium having a defect management area for storing defect management information for managing defect addresses,
First reproducing means for reproducing the defect management information stored in the defect management area;
Judging means for judging whether or not a distance between the defect address and the spare area address is a predetermined value or more from the defect management information reproduced by the first reproducing means;
Storage means for storing the information recorded in the spare area address when it is determined by the determination means that the distance is a predetermined value or more;
Second reproducing means for reproducing the information recorded in the information recording area;
A comparison determination means for comparing the address of the information with the spare area address to determine whether or not they match when the information is being reproduced by the second reproduction means;
An information reproducing apparatus comprising: a third reproducing unit that reproduces the information stored in the storage unit when it is determined by the comparison / determination unit that they match.

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